WO2017199120A1 - Procédé de séparation d'impuretés organiques d'acides inorganiques aqueux - Google Patents

Procédé de séparation d'impuretés organiques d'acides inorganiques aqueux Download PDF

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Publication number
WO2017199120A1
WO2017199120A1 PCT/IB2017/052603 IB2017052603W WO2017199120A1 WO 2017199120 A1 WO2017199120 A1 WO 2017199120A1 IB 2017052603 W IB2017052603 W IB 2017052603W WO 2017199120 A1 WO2017199120 A1 WO 2017199120A1
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WO
WIPO (PCT)
Prior art keywords
stream
mpa
chlorinated hydrocarbons
aqueous acid
overhead
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2017/052603
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English (en)
Inventor
Kuang-Yao Brian PENG
Michael Huckman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SABIC Global Technologies BV
Original Assignee
SABIC Global Technologies BV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SABIC Global Technologies BV filed Critical SABIC Global Technologies BV
Publication of WO2017199120A1 publication Critical patent/WO2017199120A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C17/00—Preparation of halogenated hydrocarbons
    • C07C17/38—Separation; Purification; Stabilisation; Use of additives
    • C07C17/383—Separation; Purification; Stabilisation; Use of additives by distillation
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B7/00—Halogens; Halogen acids
    • C01B7/01—Chlorine; Hydrogen chloride
    • C01B7/07—Purification ; Separation
    • C01B7/0706—Purification ; Separation of hydrogen chloride
    • C01B7/0712—Purification ; Separation of hydrogen chloride by distillation

Definitions

  • Monochlorom ethane can be made through a process termed "oxy chlonnation".
  • an oxychlorination of methane reaction can include feeding methane, natural gas or light hydrocarbon alkanes (e.g., C 1 -C 4 alkanes), an oxygen source, and a chlorine source such as hydrogen chloride to a reactor containing a catalyst.
  • the product stream can include monochlorom ethane, heavy chlorinated hydrocarbons, and light components (e.g., methane, carbon oxides and inert gases) as shown in the general reaction scheme below.
  • catalyst e.g., methane, carbon oxides and inert gases
  • Another process to make monochloromethane uses elemental chlorine (Cl 2 ) as the feed gas.
  • elemental chlorine Cl 2
  • free chlorine, oxygen containing gas, and the hydrocarbon to be chlorinated are contacted with a metal halide catalyst.
  • the chlorine reacts with the hydrocarbon to produce hydrogen chloride and a chlorinated product of the hydrocarbon.
  • Hydrogen chloride produced in this manner is then converted to elemental chlorine by a well-known series of reactions, thereby providing additional chlorine for the chlorination of more hydrocarbon [0004]
  • the product mixture from the oxychlorination reaction is produced at a high temperature and is cooled (e.g., quenched) by adding water to the solution to produce an aqueous mixture as shown below.
  • the absence of chlorinated hydrocarbons in the HCl reduces the amount of higher chlorinated compounds from being produced (e.g., chloroform, methylene chloride, or the like). Said another way, the selectivity for the desired methyl chloride product of the oxychlorination reaction is not reduced when the high purity HCl stream is used. Furthermore, the process of the present invention does not require the use a stripper gas to separate the organic impurities from the HCl stream.
  • a process to purify an aqueous acid solution that includes HCl and organic hydrocarbons can include (a) subjecting an acidic feed stream (e.g., an acid product stream from a methane oxychlorination reaction that includes HC1, chlorinated hydrocarbons, methane and inert gases) to aqueous quenching conditions suitable to produce a gaseous stream (e.g., chlorinated hydrocarbons, light hydrocarbons and inert gases), and an aqueous acid stream that includes the HC1 and organic hydrocarbons, and (b) heating the aqueous acid stream of step (a) at a pressure of 1.4 MPa (200 psig) to 1.75 MPa (250 psig), and to a temperature of 1 15 °C to 130 °C to produce an aqueous acid product stream and an overhead stream.
  • an acidic feed stream e.g., an acid product stream from a methane oxychlorination reaction that includes HC1, chlorinated hydrocarbon
  • a system for the purification of an aqueous acid solution that includes HC1 and organic impurities can include: (a) a quench zone configured to receive an acidic feed stream (e.g., a product stream from a methane oxychlorination reaction that includes HC1, chlorinated hydrocarbons, methane and inert gases) and produce a gaseous stream and an aqueous stream that includes the HC1 and organic impurities (e.g., chlorinated hydrocarbons); and (b) a first separation zone in fluid communication with the quench zone, the first separation zone configured to separate the aqueous acid stream of step (a) into an aqueous acid product stream and an overhead stream at a pressure of 1.4 MPa (200 psig) to 1.75 MPa (250 psig).
  • an acidic feed stream e.g., a product stream from a methane oxychlorination reaction that includes HC1, chlorinated hydrocarbons, methane and inert gases
  • chlorinated hydrocarbons refers to chlorinated hydrocarbons having a general formula of CH 4-X C1 X , where x is 1 to 4.
  • Non-limiting examples of chlorinated hydrocarbons include monochloromethane, dichloromethane, chloroform, and carbon tetrachloride.
  • "Heavy chlorinated hydrocarbons” are defined as CH 4-X C1 X , where x is 2 to 4.
  • Separation unit 114 can be any type of unit (e.g., flash drum, settling unit, depressurizing vessel, etc.) capable of separating liquids from a gaseous mixture.
  • any residual hydrogen chloride and/or water (e.g., hydrochloric acid) in gaseous stream 108 can be separated from the gaseous stream to produce reflux stream 116 and second gaseous product stream 118.
  • Reflux stream 116 can include the HC1 and/or water, and can be provided to separation system 200 (shown in FIGS. 2 and 3) via fluid mover (e.g., pump) 120.
  • fluid mover e.g., pump
  • Second gaseous stream 118 can include chlorinated hydrocarbons, methane and inert gases. Second gaseous stream 1 18 can be transported to other processing units for further purification to obtain the desired chlorinated hydrocarbons (e.g., monochloromethane).
  • Second gaseous stream 1 18 can be transported to other processing units for further purification to obtain the desired chlorinated hydrocarbons (e.g., monochloromethane).
  • Heat exchanger 122 can exchange heat with aqueous acid stream 1 10 to produce a cooled aqueous acid stream.
  • aqueous acid stream 1 10 can be cooled to a temperature of 55 °C to 65 °C at operating pressures (e.g., 0.85 MPa to 1.0 MPa or 0.93 MPa)
  • Acid product stream 212 can include at least 9 wt.%, 15 wt.%, 20 wt.% or more of hydrogen chloride and a trace amount (e.g., 1000 ppm or less, 900 ppm or less, 500 ppm or less, 250 ppm or less, 150 ppm or less, 100 ppm or less or 50 ppm or less) of chlorinated hydrocarbons. Acid product stream 212 can be stored, transported, or sent to other processing units to recover the hydrogen chloride from the water.
  • a trace amount e.g. 1000 ppm or less, 900 ppm or less, 500 ppm or less, 250 ppm or less, 150 ppm or less, 100 ppm or less or 50 ppm or less
  • Separation unit 306 can include one or more heating and pressurizing systems (for example, a reboiler system, heat exchangers, and the like) to heat and pressurize the overhead stream to effect separation of the organic impurities (e.g., chlorinated hydrocarbons ) from the dried overhead stream and produce second overhead stream 316 and bottoms stream 322.
  • Bottoms stream 322 can include the organic impurities such as chlorinated hydrocarbons, and can be collected, transported, stored or further processed.
  • Overhead stream 316 can include hydrogen chloride, water, and, in some instances, chlorinated hydrocarbons. Overhead stream 316 can pass through condenser 308 and enter gas/liquid separation unit 310.
  • Tables 1 and 2 list the weight fractions of the components of the streams in FIG. 2 and FIG. 3, respectively as determined through computer calculations using Aspen Plus® (Aspen Technology, USA).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

L'invention concerne des procédés d'élimination d'impuretés organiques d'un courant acide aqueux obtenu à partir d'une oxychloration de la réaction du méthane. Un procédé consiste à chauffer un courant acide aqueux provenant d'une unité de trempe à une pression allant de 1,4 MPa (200 psig) à 1,75 MPa (250 psig), afin de produire un courant de produit acide aqueux et un courant de tête. Le courant de produit acide aqueux comprend au moins une quantité minimale d'hydrocarbures chlorés, ou bien il est sensiblement exempt d'hydrocarbures chlorés. Le courant de tête peut être recyclé vers l'unité de trempe ou soumis à des conditions appropriées pour éliminer l'eau et les hydrocarbures chlorés du courant de tête, afin de produire un courant de chlorure d'hydrogène de pureté élevée.
PCT/IB2017/052603 2016-05-19 2017-05-04 Procédé de séparation d'impuretés organiques d'acides inorganiques aqueux Ceased WO2017199120A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201662338710P 2016-05-19 2016-05-19
US62/338,710 2016-05-19

Publications (1)

Publication Number Publication Date
WO2017199120A1 true WO2017199120A1 (fr) 2017-11-23

Family

ID=60325758

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2017/052603 Ceased WO2017199120A1 (fr) 2016-05-19 2017-05-04 Procédé de séparation d'impuretés organiques d'acides inorganiques aqueux

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Country Link
WO (1) WO2017199120A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111943141A (zh) * 2020-09-02 2020-11-17 南通山剑防腐科技有限公司 一种具有负压脱水功能的盐酸解析装置及解析工艺

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2730194A (en) * 1952-04-04 1956-01-10 Michigan Chem Corp Hydrochloric acid from chloral vent gases
US3968178A (en) * 1967-11-08 1976-07-06 Stauffer Chemical Company Chlorination of hydrocarbons
WO2001025144A1 (fr) * 1999-10-07 2001-04-12 Merck Patent Gmbh Procede de preparation d'acide chlorhydrique extremement pur
US20030196764A1 (en) * 2002-04-17 2003-10-23 Brady Bill L. Process for purification of anhydrous hydrogen chloride gas
US20080264253A1 (en) * 2007-04-26 2008-10-30 Bayer Materialscience Ag Processes for removing organic components from gases containing hydrogen chloride

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2730194A (en) * 1952-04-04 1956-01-10 Michigan Chem Corp Hydrochloric acid from chloral vent gases
US3968178A (en) * 1967-11-08 1976-07-06 Stauffer Chemical Company Chlorination of hydrocarbons
WO2001025144A1 (fr) * 1999-10-07 2001-04-12 Merck Patent Gmbh Procede de preparation d'acide chlorhydrique extremement pur
US20030196764A1 (en) * 2002-04-17 2003-10-23 Brady Bill L. Process for purification of anhydrous hydrogen chloride gas
US20080264253A1 (en) * 2007-04-26 2008-10-30 Bayer Materialscience Ag Processes for removing organic components from gases containing hydrogen chloride

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111943141A (zh) * 2020-09-02 2020-11-17 南通山剑防腐科技有限公司 一种具有负压脱水功能的盐酸解析装置及解析工艺

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