WO2017165344A1 - Acrylic acid, and methods of producing thereof - Google Patents

Acrylic acid, and methods of producing thereof Download PDF

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Publication number
WO2017165344A1
WO2017165344A1 PCT/US2017/023302 US2017023302W WO2017165344A1 WO 2017165344 A1 WO2017165344 A1 WO 2017165344A1 US 2017023302 W US2017023302 W US 2017023302W WO 2017165344 A1 WO2017165344 A1 WO 2017165344A1
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Prior art keywords
acrylic acid
beta
propiolactone
zeolite
produced
Prior art date
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PCT/US2017/023302
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French (fr)
Inventor
Sadesh H. SOOKRAJ
Alexander Tseitlin
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Novomer Inc
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Novomer Inc
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Publication date
Priority to KR1020187030170A priority Critical patent/KR20180128018A/en
Priority to MX2018011139A priority patent/MX2018011139A/en
Priority to CA3018118A priority patent/CA3018118A1/en
Priority to AU2017238018A priority patent/AU2017238018A1/en
Priority to JP2018549537A priority patent/JP2019509307A/en
Priority to EP17770939.1A priority patent/EP3433222B1/en
Priority to US16/087,051 priority patent/US20200325093A1/en
Priority to BR112018069019A priority patent/BR112018069019A2/en
Priority to CN201780018126.3A priority patent/CN108884000A/en
Application filed by Novomer Inc filed Critical Novomer Inc
Publication of WO2017165344A1 publication Critical patent/WO2017165344A1/en
Priority to SA518400053A priority patent/SA518400053B1/en
Anticipated expiration legal-status Critical
Priority to CONC2018/0010877A priority patent/CO2018010877A2/en
Priority to ZA2018/07001A priority patent/ZA201807001B/en
Priority to US17/152,248 priority patent/US11827590B2/en
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/09—Preparation of carboxylic acids or their salts, halides or anhydrides from carboxylic acid esters or lactones
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/26—Synthetic macromolecular compounds
    • B01J20/265—Synthetic macromolecular compounds modified or post-treated polymers
    • B01J20/267—Cross-linked polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B01J20/3085—Chemical treatments not covered by groups B01J20/3007 - B01J20/3078
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
    • B01J27/14—Phosphorus; Compounds thereof
    • B01J27/16—Phosphorus; Compounds thereof containing oxygen, i.e. acids, anhydrides and their derivates with N, S, B or halogens without carriers or on carriers based on C, Si, Al or Zr; also salts of Si, Al and Zr
    • B01J27/18—Phosphorus; Compounds thereof containing oxygen, i.e. acids, anhydrides and their derivates with N, S, B or halogens without carriers or on carriers based on C, Si, Al or Zr; also salts of Si, Al and Zr with metals other than Al or Zr
    • B01J27/1802—Salts or mixtures of anhydrides with compounds of other metals than V, Nb, Ta, Cr, Mo, W, Mn, Tc, Re, e.g. phosphates, thiophosphates
    • B01J27/1806—Salts or mixtures of anhydrides with compounds of other metals than V, Nb, Ta, Cr, Mo, W, Mn, Tc, Re, e.g. phosphates, thiophosphates with alkaline or alkaline earth metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/08—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the faujasite type, e.g. type X or Y
    • B01J29/084—Y-type faujasite
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J29/00—Catalysts comprising molecular sieves
    • B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
    • B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
    • B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J4/00—Feed or outlet devices; Feed or outlet control devices
    • B01J4/001—Feed or outlet devices as such, e.g. feeding tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/02—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/02—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with stationary particles, e.g. in fixed beds
    • B01J8/0278—Feeding reactive fluids
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
    • C07C51/44—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C07C51/50—Use of additives, e.g. for stabilisation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C57/00—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms
    • C07C57/02—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms with only carbon-to-carbon double bonds as unsaturation
    • C07C57/03—Monocarboxylic acids
    • C07C57/04—Acrylic acid; Methacrylic acid
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D305/00—Heterocyclic compounds containing four-membered rings having one oxygen atom as the only ring hetero atoms
    • C07D305/02—Heterocyclic compounds containing four-membered rings having one oxygen atom as the only ring hetero atoms not condensed with other rings
    • C07D305/10—Heterocyclic compounds containing four-membered rings having one oxygen atom as the only ring hetero atoms not condensed with other rings having one or more double bonds between ring members or between ring members and non-ring members
    • C07D305/12—Beta-lactones
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F120/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
    • C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F120/04—Acids; Metal salts or ammonium salts thereof
    • C08F120/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
    • C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
    • C08F20/04—Acids, Metal salts or ammonium salts thereof
    • C08F20/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008—Controlling the process
    • B01J2208/00017—Controlling the temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00008—Controlling the process
    • B01J2208/00539—Pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
    • B01J2208/00743—Feeding or discharging of solids
    • B01J2208/00752—Feeding

Definitions

  • the carbonylation catalyst comprises [(TPP)Al] [Co(CO) 4 ], [(ClTPP)Al] [Co(CO) 4 ], [(TPP)Cr][Co(CO) 4 ], [(ClTPP)Cr] [Co(CO) 4 ], [(salcy)Cr] [Co(CO) 4 ], [(salph)Cr] [Co(CO) 4 ], or [(salph)Al] [Co(CO) 4 ] .
  • TPP refers to
  • acrylic acid is produced at a yield of at least 50%, at least 55%, at least 60%, at least 65%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, or at least 95%.
  • the acrylic acid produced has a purity of at least 95%, at least 96%, at least 97%, or at least 98%. In some variations where the acrylic acid produced is isolated, e.g.
  • a mixture of beta-propiolactone (3.0 g) and phenothiazine (9.0 mg) was added using a needle value to a mixture of sulfolane (40. Og) and Zeolite Y hydrogen (20.0 g) at 165°C with 50 psi of carbon monoxide.
  • Zeolite Y hydrogen 80: 1 mole ratio S1O 2 /AI 2 O 3 , powder S. A. 780 m /g
  • Phenothiazine was the polymerization inhibitor used.
  • Sulfolane was the solvent used, and was dried over 3A molecular sieves prior to use.
  • the beta-propiolactone was added slowly using the needle valve over about 8.6 minutes. The reaction mixture was heated to 170°C to produce acrylic acid.

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  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Catalysts (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Abstract

Provided herein are methods of producing acrylic acid from beta-propiolactone. Such methods may involve the use of a heterogeneous catalyst, such as a zeolite.

Description

ACRYLIC ACID, AND METHODS OF PRODUCING THEREOF
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority to U.S. Provisional Patent Application No.
62/311,262, filed March 21, 2016, which is incorporated herein by reference in its entirety.
FIELD
[0001] The present disclosure relates generally to production of acrylic acid, and more specifically to production of acrylic acid from beta-propio lactone.
BACKGROUND
[0002] The production and use of acrylic acid (AA) has grown significantly in recent decades as the demand for polyacrylic acid-based superabsorbent polymers (SAPs) has grown. SAPs are used extensively for the manufacture of diapers, adult incontinence products, and feminine hygiene products, as well as in agricultural applications.
[0003] Currently, commercial acrylic acid is typically derived from propylene oxidation. Propylene is primarily a product of oil refining and its price and availability are closely tied to crude oil prices. Because of this, acrylic acid prices have risen dramatically in recent years. Thus, there exists a need in the art for alternative methods to synthesize acrylic acid.
BRIEF SUMMARY
[0004] Provided herein are methods of producing acrylic acid from beta-propio lactone. In some aspects, provided is a method of producing acrylic acid from beta-propio lactone, by combining beta-propio lactone, a heterogeneous catalyst, a polymerization inhibitor, and optionally a solvent; and producing acrylic acid from at least a portion of the beta-propio lactone. In some embodiments, the heterogeneous catalyst is a zeolite. In some variations, the zeolite is an acidic zeolite.
DESCRIPTION OF THE FIGURES
[0005] The present application can be best understood by reference to the following description taken in conjunction with the accompanying figures, in which like parts may be referred to by like numerals. [0006] FIG. 1 depicts an exemplary process to produce acrylic acid from beta-propio lactone in the presence of a zeolite and a polymerization inhibitor.
[0007] FIG. 2 depicts an exemplary reaction system to produce acrylic acid from beta- propiolactone according to the methods described herein.
DETAILED DESCRIPTION
[0008] The following description sets forth exemplary methods, parameters and the like. It should be recognized, however, that such description is not intended as a limitation on the scope of the present disclosure but is instead provided as a description of exemplary embodiments.
[0009] Provided herein are methods of producing acrylic acid from beta-propio lactone using heterogeneous catalysts, such as zeolites. Such methods produce acrylic acid from beta- propiolactone in a one-pot reaction. Such methods may also produce acrylic acid in high yields, by minimizing other products that may form, such as polypropiolactone and polyacrylic acid.
[0010] In some aspects, provided is a method of producing acrylic acid from beta- propiolactone, by combining beta-propio lactone, a zeolite, and a polymerization inhibitor; and producing acrylic acid from at least a portion of the beta-propio lactone. For example, with reference to FIG. 1, process 100 is an exemplary process to produce acrylic acid. Beta- propiolactone 102 is combined with zeolite 104 and polymerization inhibitor 106 to produce acrylic acid 110. In some variations, process 100 is performed neat. In other variations, process 100 is performed in the presence of a solvent. In some embodiments, the method further includes continuously isolating the acrylic acid produced. In some variations, the acrylic acid is isolated by distillation.
[0011] The beta-propiolactone, catalysts, polymerization inhibitors, solvents and reaction conditions, as well as acrylic acid produced, are described in further detail below.
Beta-propiolactone (BPL)
[0012] In some embodiments, the beta-propiolactone used in the methods described herein may be produced by epoxide carbonylation. For example, the beta-propiolactone may be produced from ethylene oxide and carbon monoxide via a carbonylation reaction. See e.g., WO 2010/118128. In one variation, the beta-propiolactone is produced by reacting ethylene oxide with carbon monoxide in the presence of a carbonylation catalyst and optionally a solvent. [0013] Suitable carbonylation catalysts are described in, for example, WO 2010/118128. For example, the carbonylation catalyst comprises [(TPP)Al] [Co(CO)4], [(ClTPP)Al] [Co(CO)4], [(TPP)Cr][Co(CO)4], [(ClTPP)Cr] [Co(CO)4], [(salcy)Cr] [Co(CO)4], [(salph)Cr] [Co(CO)4], or [(salph)Al] [Co(CO)4] . It should generally be understood that "TPP" refers to
tetraphenylporphyrin; "C1TPP" refers to meso-tetra(4-chlorophenyl)porphyrin); "salcy" refers to (TV, N'-bis(3,5-di-ieri-butylsalicylidene)- l,2-diaminocyclohexane); and "salph" refers to (TV, N'- bis( s alic ylidene) -o-pheny lenediamine) .
[0014] In some variations, the beta-propiolactone is added to the reaction with an initial pressure of carbon monoxide. In other variations where the method is continuous, no initial pressure is required to add the beta-propiolactone.
Catalysts
[0015] In some embodiments, the catalyst used in the conversion of beta-propiolactone to acrylic acid is a heterogeneous catalyst. In certain variations, the catalyst is a zeolite. In one variation, the catalyst is an acidic zeolite. For example, the zeolite may be Zeolite Y or Zeolite ZSM-5.
[0016] In certain variations, the zeolite is Zeolite Y hydrogen in powder form. In one variation, the Zeolite Y hydrogen has a 80: 1 mole ratio S1O2/AI2O3, and has a powder surface area of 780 m /g.
[0017] The zeolite may be dried using any suitable methods or techniques known in the art (e.g., using heat and/or vacuum) prior to use.
[0018] A combination of any of the catalysts described herein may also be used. Polymerization Inhibitors
[0019] In some embodiments, the polymerization inhibitor used in the conversion of beta- propiolactone to acrylic acid is a radical polymerization inhibitor. Suitable polymerization inhibitors may include, for example, phenothiazine.
Solvents
[0020] In some embodiments of the methods described herein, the conversion of beta- propiolactone to acrylic acid is performed neat. In other embodiments, the conversion of beta- propiolactone to acrylic acid is performed in the presence of a solvent. [0021] In some variations, the solvent selected (i) dissolves, or at least partially dissolves, the beta-propiolactone, but does not react, or minimally reacts, with the beta-propiolactone; or (ii) has a high boiling point so that the acrylic acid produced may be distilled while solvent remains in the reactor, or a combination of (i) and (ii). In certain variations, the solvent is a polar aprotic solvent. For example, the solvent may be a high boiling polar aprotic solvent. In one variation, the solvent includes sulfolane.
[0022] The amount of solvent used may be varied to balance the metering of beta- propiolactone added and the overall concentration of reagents in the reaction mixture. For example, in one variation, the ratio of beta-propiolactone to solvent in the reaction is about 1 : 1.
[0023] The solvent may be dried using any suitable methods or techniques known in the art prior to use.
[0024] A combination of any of the solvents described herein may also be used. Processing Conditions
[0025] The methods described herein may be carried out batch-wise or continuously.
Various factors may affect the conversion of beta-propiolactone to acrylic acid according to the methods described herein.
[0026] For example, the rate of beta-propiolactone addition may affect the yield of acrylic acid. In some variations, the method further includes controlling the rate of addition of beta- propiolactone. A slower rate of beta-propiolactone addition was unexpectedly observed to increase the yield of acrylic acid produced. In some variations of the methods described herein, the beta-propiolactone is provided at a rate of less than 1.5 g/min, less than 1.4 g/min, less than 1.3 g/min, less than 1.2 g/ min, less than 1.1 g/min, less than 1 g/min, less than 0.9 g/min, or less than 0.8 g/ min; or between 0.5 g/min and 1.5 g/min, or between 0.75 g/min and 1.25 g/min; or about 1 g/min.
[0027] A slower rate of beta-propiolactone addition was also unexpectedly observed to reduce the amount of other products formed, such as polypropiolactone and polyacrylic acid. In some variations, the method further includes minimizing or suppressing production of polypropiolactone from at least a portion of the beta-propiolactone. In one variation, little or no polypropiolactone is produced. In other variations that may be combined with the foregoing, the method further includes minimizing or supressing production of polyacrylic acid from at least a portion of the acrylic acid produced. In one variation, little or no polyacrylic acid is produced.
[0028] The amount of beta-propio lactone added may be metered by any suitable methods or techniques in the art. For example, beta-propio lactone may be metered or slowly added to the reactor via a needle valve.
[0029] The removal of acrylic acid produced may also affect the yield of acrylic acid.
Stripping off of the acrylic acid produced was also unexpectedly observed to increase yield of the acrylic acid produced. In some variations, the method further includes stripping off at least a portion of the acrylic acid produced (e.g. , by distillation). In certain variations of the foregoing, stripping off at least a portion of the acrylic acid produced minimizes polymerization of the acrylic acid, and thus, formation of polyacrylic acid.
[0030] In some embodiments, the acrylic acid may be produced at a pressure that strips off of at least a portion of the acrylic acid produced. For example, in one variation, the method may be performed at subatmo spheric pressure of 100 mm Hg. In other variations, vacuum may be applied in the range of 200 to 20 mm Hg.
[0031] The acrylic acid may be produced at elevated temperatures according to the methods described herein. In some embodiments, the temperature is at least 100°C, at least 105°C, at least 110°C, at least 115°C, at least 120°C, at least 125°C, at least 130°C, at least 135°C, at least 140°C, at least 145°C, at least 150°C, at least 155°C, at least 160°C, at least 165°C, at least 170°C, at least 175°C, at least 180°C, at least 185°C, at least 190°C, at least 195°C, at least 200°C, at least 205°C, at least 210°C, at least 215°C, or at least 220°C; or between 100°C and 220°C, or between 170°C and 200°C. In some variations, the reactor in which the method is performed is heated to the temperatures described herein. In other variations, the beta- propiolactone, polymerization inhibitor, catalyst, and/or solvent is provided to the reactor at the temperatures described herein.
Acrylic Acid
[0032] In some embodiments of the methods described herein, acrylic acid is produced at a yield of at least 50%, at least 55%, at least 60%, at least 65%, at least 70%, at least 75%, at least 80%, at least 85%, at least 90%, or at least 95%. [0033] In some embodiments of the methods described herein, the acrylic acid produced has a purity of at least 95%, at least 96%, at least 97%, or at least 98%. In some variations where the acrylic acid produced is isolated, e.g. , by distillation, the acrylic acid has a purity of at least 98%, at least 98.5%, at least 99%, at least 99.1%, at least 99.2%, at least 99.3%, at least 99.4%, at least 99.5%, at least 99.6%, at least 99.7%, at least 99.8%, or at least 99.9%.
Downstream Products
[0034] The acrylic acid produced according to the methods described herein may be used for various applications. For example, acrylic acid may be used to make polyacrylic acid for superabsorbent polymers (SAPs). The SAPs find use in diapers, adult incontinence products, and feminine hygiene products among other things.
[0035] In some aspects, provided is a method for producing a superabsorbent polymer, by: polymerizing the acrylic acid produced according to any of the methods described herein in the presence of a cross-linker to produce the superabsorbent polymer.
Acrylic Acid Production Systems
[0036] In other aspects, provided herein are systems for production of acrylic acid. For example, with reference to FIG. 2, an exemplary acrylic acid production system is depicted. System 200 is configured to produce acrylic acid from beta-propio lactone, according to the methods described herein.
[0037] System 200 includes reactor 210, configured to receive beta-propiolactone, a zeolite, and a polymerization inhibitor, and to produce acrylic acid from at least a portion of the beta- propiolactone according to the methods described herein. Reactor 210 is configured to produce acrylic acid at an elevated temperature. Any of the temperatures described herein for the methods may be employed in the system. For example, in one variation, reactor 210 is configured to produce acrylic acid at a temperature between 170°C and 200°C. Suitable reactors may include, for example, a Parr reactor.
[0038] In some variations, reactor 210 is configured to control the rate of addition of one or more of the beta-propiolactone, the zeolite, and the polymerization inhibitor added. For example, in one variation, a mixture of the beta-propiolactone and the polymerization inhibitor may be slowly added using a needle valve to a mixture of catalyst in a solvent. [0039] With reference again to FIG. 2, reactor 210 further includes vapor port 214. In some variations, reactor 210 is configured to continuously strip off at least a portion of the acrylic acid produced, and vapor port 214 is configured to pass acrylic acid vapors to collection vessel 220.
[0040] With reference again to FIG. 2, system 200 further includes acid/base scrubber 230, configured to receive acrylic acid from collection vessel 220. In other variations of the system, acid/base scrubber 230 may be omitted. Further, with reference to FIG. 2, elements 212, 216 and 222 are dip tubes.
[0041] The systems provided herein may be configured for batch- wise or continuous production of acrylic acid.
EXAMPLES
[0042] The following Examples are merely illustrative and are not meant to limit any aspects of the present disclosure in any way.
Example 1
Conversion of beta-propiolactone to acrylic acid using a zeolite
[0043] This Example demonstrates the production of acrylic acid from beta-propiolactone using a zeolite.
[0044] A mixture of beta-propiolactone (3.0 g) and phenothiazine (9.0 mg) was added using a needle value to a mixture of sulfolane (40. Og) and Zeolite Y hydrogen (20.0 g) at 165°C with 50 psi of carbon monoxide. Zeolite Y hydrogen (80: 1 mole ratio S1O2/AI2O3, powder S. A. 780 m /g) was dried under vacuum at 100°C for one day before use. Phenothiazine was the polymerization inhibitor used. Sulfolane was the solvent used, and was dried over 3A molecular sieves prior to use. The beta-propiolactone was added slowly using the needle valve over about 8.6 minutes. The reaction mixture was heated to 170°C to produce acrylic acid.
[0045] The reaction was monitored by infrared spectroscopy (IR). The reaction was observed to be completed after about 3 hours, when no beta-propiolactone was detectable by IR. The zeolite was then filtered off from the reaction mixture, and a sample of the resulting mixture was dissolved in deuterium (D20) and chloroform (CDCI3) for nuclear magnetic resonance (NMR) analysis. The observed vinyl peaks between δ 5.80 and 6.47 ppmin the 1H NMR confirmed the production of acrylic acid.

Claims

CLAIMS What is claimed is:
1. A method of producing acrylic acid from beta-propiolactone, comprising:
combining beta-propiolactone, a zeolite, and a polymerization inhibitor; and
producing acrylic acid from at least a portion of the beta-propiolactone.
2. The method of claim 1, the zeolite is an acidic zeolite.
3. The method of claim 1 or 2, wherein the zeolite is Zeolite Y or Zeolite ZSM-5, or a combination thereof.
4. The method of any one of claims 1 to 3, wherein the polymerization inhibitor is phenothiazine.
5. The method of any one of claims 1 to 4, wherein the beta-propiolactone is provided at a rate of less than 1.5 g/min.
6. The method of claim 5, wherein the beta-propiolactone is provided at a rate of between 0.75 g/min and 1.25 g/min.
7. The method of any one of claims 1 to 6, wherein the acrylic acid produced is
continuously isolated.
8. The method of any one of claims 1 to 7, wherein the acrylic acid is produced at a yield of at least 50%.
9. The method of any one of claims 1 to 8, wherein the acrylic acid is produced at a temperature of between 170°C and 200°C.
10. The method of any one of claims 1 to 9, wherein the beta-propiolactone, the
polymerization inhibitor, and the zeolite are further combined with a solvent.
11. The method of claim 10, wherein the solvent comprises a polar aprotic solvent.
12. The method of claim 10, wherein the solvent comprises sulfolane.
13. The method of any one of claims 1 to 12, wherein the acrylic acid produced has a purity of greater than 95%.
14. The method of any one of claims 1 to 13, further comprising isolating acrylic acid.
15. The method of claim 14, wherein the acrylic acid is isolated by distillation.
16. The method of any one of claims 1 to 15, wherein the beta-propiolactone is produced from ethylene oxide and carbon monoxide.
17. A method of producing a superabsorbent polymer, comprising: polymerizing acrylic acid produced according to the method of any one of claims 1 to 16 in the presence of a cross-linker to produce the superabsorbent polymer.
18. A system, comprising: a reactor, wherien the reactor comprises one or more inlets and a vapor port; and a collection vessel, wherein the one or more inlets of the reactor are configured to receive beta- propiolactone, a zeolite, and a polymerization inhibitor, wherein the reactor is configured to produce acrylic acid vapors from at least a portion of the beta-propio lactone received, and to continuously strip off at least a portion of the acrylic acid vapors produced, and wherein the vapor port is configured to pass at least a portion of the acrylic acid vapors to the collection vessel.
19. The system of claim 18, further comprising an acid/base scrubber.
PCT/US2017/023302 2016-03-21 2017-03-21 Acrylic acid, and methods of producing thereof Ceased WO2017165344A1 (en)

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AU2017238018A AU2017238018A1 (en) 2016-03-21 2017-03-21 Acrylic acid, and methods of producing thereof
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EP17770939.1A EP3433222B1 (en) 2016-03-21 2017-03-21 Acrylic acid, and methods of producing thereof
US16/087,051 US20200325093A1 (en) 2016-03-21 2017-03-21 Acrylic acid, and methods of producing thereof
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SA518400053A SA518400053B1 (en) 2016-03-21 2018-09-19 Improved acrylic acid production process
CONC2018/0010877A CO2018010877A2 (en) 2016-03-21 2018-10-10 Acrylic acid and production methods thereof
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