US3562344A - Paraxylene recovery - Google Patents

Paraxylene recovery Download PDF

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Publication number
US3562344A
US3562344A US826637A US3562344DA US3562344A US 3562344 A US3562344 A US 3562344A US 826637 A US826637 A US 826637A US 3562344D A US3562344D A US 3562344DA US 3562344 A US3562344 A US 3562344A
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US
United States
Prior art keywords
xylenes
naphthenes
zone
paraxylene
isomerization
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.)
Expired - Lifetime
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US826637A
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English (en)
Inventor
Robert J Hengstebeck
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Standard Oil Co
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Standard Oil Co
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Filing date
Publication date
Application filed by Standard Oil Co filed Critical Standard Oil Co
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Publication of US3562344A publication Critical patent/US3562344A/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C15/00—Cyclic hydrocarbons containing only six-membered aromatic rings as cyclic parts
    • C07C15/02—Monocyclic hydrocarbons
    • C07C15/067—C8H10 hydrocarbons
    • C07C15/08—Xylenes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S585/00—Chemistry of hydrocarbon compounds
    • Y10S585/8995—Catalyst and recycle considerations
    • Y10S585/901—Catalyst and recycle considerations with recycle, rehabilitation, or preservation of solvent, diluent, or mass action agent

Definitions

  • a feed rich in C8 aromatics and hydrogen is irst passed through an isomerization zone maintained at suitable isomerization conditions and containing a suitable hydrogenation-dehydrogenation catalyst.
  • Typical conditions and catalysts are illustrated in U.S. Pat. No. 2,976,332 and No. 3,180,839.
  • Cg-rich aromatics are converted to a mix of xylene isomers and naphthenes, and then the mix is withdrawn from the isomerization zone.
  • This mix could be fed directly into a fractional crystallization unit where the different isomers of xylenes would be separated from each other using conventional techniques and standard refrigeration equipment. If this is done, however, the load on the refrigeration equipment would be high because of the presence of naphthenes in the mix.
  • the xylenes could be rst separated from the naphthenes and then fed to the fractional crystallization unit. If this is done the load on the refrigeration equipment is reduced, but yields of paraxylene, the most valuable isomer product, are also reduced.
  • Separation of the light byproducts, naphthenes and xylenes may be achieved by fractional distillation, with the naphthene fraction boiling between the range of about 235 and about 265 F. Paraxylene recovery is achieved by conventional fractional crystallization. Any unseparated xylenes are recycled to the isomerization zone.
  • the ligure which is a schematic ilow digram illustrating my process, shows C8 aromatics from source l0 being mixed with hydrogen from source 12 and then fed via line 14 to isomerization zone 16.
  • the naphthene-rich fraction boiling between 23S-265 F. is drawn off through line 22 and recycled via this line and line 14 to zone 16. This maintains the optimum or near optimum equilibrium concentration of naphthene in zone 16, so that most of the C8 aromatics entering zone 16 are converted to xylenes.
  • Optimum naphthene concentration is dependent on pressure, temperature, and catalyst in zone 16, and 'will vary as these parameters vary.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
US826637A 1969-05-21 1969-05-21 Paraxylene recovery Expired - Lifetime US3562344A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US82663769A 1969-05-21 1969-05-21
BE757255 1970-10-08

Publications (1)

Publication Number Publication Date
US3562344A true US3562344A (en) 1971-02-09

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ID=25656858

Family Applications (1)

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US826637A Expired - Lifetime US3562344A (en) 1969-05-21 1969-05-21 Paraxylene recovery

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US (1) US3562344A (fr)
BE (1) BE757255A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835198A (en) * 1968-08-29 1974-09-10 Phillips Petroleum Co Production of paraxylene
US4414419A (en) * 1979-02-12 1983-11-08 Ruhrchemie Aktiengesellschaft Stabilization of aldehydes
US5070235A (en) * 1990-06-18 1991-12-03 General Signal Corporation Accumulated exposure detection with exposure terminating attenuator
US20090182182A1 (en) * 2007-12-12 2009-07-16 Bauer John E Process for isomerizing a non-equilibrium alkylaromatic feed mixture and an aromatic production facility
WO2017172414A1 (fr) 2016-03-31 2017-10-05 Uop Llc Procédés et appareils de recyclage de naphtène dans la production de produits aromatiques

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3835198A (en) * 1968-08-29 1974-09-10 Phillips Petroleum Co Production of paraxylene
US4414419A (en) * 1979-02-12 1983-11-08 Ruhrchemie Aktiengesellschaft Stabilization of aldehydes
US5070235A (en) * 1990-06-18 1991-12-03 General Signal Corporation Accumulated exposure detection with exposure terminating attenuator
US20090182182A1 (en) * 2007-12-12 2009-07-16 Bauer John E Process for isomerizing a non-equilibrium alkylaromatic feed mixture and an aromatic production facility
US7932426B2 (en) 2007-12-12 2011-04-26 Uop Llc Process for isomerizing a non-equilibrium alkylaromatic feed mixture and an aromatic production facility
WO2017172414A1 (fr) 2016-03-31 2017-10-05 Uop Llc Procédés et appareils de recyclage de naphtène dans la production de produits aromatiques
CN108698955A (zh) * 2016-03-31 2018-10-23 环球油品公司 用于芳族化合物产物生产中的环烷再循环的方法和装置
US20180319724A1 (en) * 2016-03-31 2018-11-08 Uop Llc Processes and apparatuses for naphthene recycle in the production of aromatic products
EP3455195A4 (fr) * 2016-03-31 2020-02-19 Uop Llc Procédés et appareils de recyclage de naphtène dans la production de produits aromatiques
US10822291B2 (en) * 2016-03-31 2020-11-03 Uop Llc Processes and apparatuses for naphthene recycle in the production of aromatic products
CN108698955B (zh) * 2016-03-31 2022-02-08 环球油品公司 用于芳族化合物产物生产中的环烷再循环的方法和装置

Also Published As

Publication number Publication date
BE757255A (fr) 1971-03-16

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