GB763018A - Production of ketene - Google Patents

Production of ketene

Info

Publication number
GB763018A
GB763018A GB17212/54A GB1721254A GB763018A GB 763018 A GB763018 A GB 763018A GB 17212/54 A GB17212/54 A GB 17212/54A GB 1721254 A GB1721254 A GB 1721254A GB 763018 A GB763018 A GB 763018A
Authority
GB
United Kingdom
Prior art keywords
ketene
pyrolysis
acetic acid
phosphate
per cent
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
Application number
GB17212/54A
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.)
Celanese Corp
Original Assignee
Celanese Corp
Celanese Corp of America
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 Celanese Corp, Celanese Corp of America filed Critical Celanese Corp
Publication of GB763018A publication Critical patent/GB763018A/en
Expired legal-status Critical Current

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/54Preparation of carboxylic acid anhydrides
    • C07C51/56Preparation of carboxylic acid anhydrides from organic acids, their salts, their esters or their halides, e.g. by carboxylation
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/54Preparation of carboxylic acid anhydrides

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Ketene is prepared by the vapour phase catalytic pyrolysis of acetic acid at a temperature between 625 DEG and 750 DEG C. and under a pressure between atmospheric pressure and about 20 p.s.i.g., using a reaction vessel in which the surfaces contacting the ketene are constructed of a steel containing between 3 and 4 per cent of molybdenum and between 17 and 20 per cent chromium and 8 to 12 per cent nickel as major alloying metals, the contact time of the vapours in the pyrolysis zone being between 5.0 and 0.1 secs. Specified steels are U.S. Types 316 and 317 stainless steels. Preferably, there is introduced into the products issuing from the reaction vessel a substance such as ammonia, pyridine, aniline or suitable aliphatic amine, which will neutralize the catalyst and retard recombination of the ketene with water or acetic acid. Thereafter, the gases may be cooled and the still gaseous ketene separated from the condensed products, e.g. by means of a cyclone separator. Advantageously, some acetic anhydride is added to the acetic acid feed-stock to reduce acetic anhydride formation in the pyrolysis; thus, the liquid condensate separated from the ketene, comprising acetic anhydride, water and unchanged acetic acid may be azeotropically distilled with e.g. benzene or hexane to remove the water and the residue recycled with fresh acid to the pyrolysis zone. Pyrolysis catalysts which may be used include volatilizable phosphates and phosphoric acid esters such as triethyl phosphate, tricresyl phosphate, ammonium and di-ammonium phosphates, dimethyl ammonium phosphate and pyridinium phosphate; the abovementioned addition of a neutralizing agent may be dispensed with when the catalyst is a volatile base salt of phosphoric acid. Examples are given.
GB17212/54A 1953-06-15 1954-06-11 Production of ketene Expired GB763018A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US763018XA 1953-06-15 1953-06-15

Publications (1)

Publication Number Publication Date
GB763018A true GB763018A (en) 1956-12-05

Family

ID=22131128

Family Applications (1)

Application Number Title Priority Date Filing Date
GB17212/54A Expired GB763018A (en) 1953-06-15 1954-06-11 Production of ketene

Country Status (1)

Country Link
GB (1) GB763018A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3406588A4 (en) * 2016-01-20 2019-01-09 Daicel Corporation Method for producing ketene derivative

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3406588A4 (en) * 2016-01-20 2019-01-09 Daicel Corporation Method for producing ketene derivative

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