GB858485A - Improvements in or relating to the manufacture of ketene - Google Patents

Improvements in or relating to the manufacture of ketene

Info

Publication number
GB858485A
GB858485A GB2370658A GB2370658A GB858485A GB 858485 A GB858485 A GB 858485A GB 2370658 A GB2370658 A GB 2370658A GB 2370658 A GB2370658 A GB 2370658A GB 858485 A GB858485 A GB 858485A
Authority
GB
United Kingdom
Prior art keywords
ketene
tube
acetone
vessel
relating
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
GB2370658A
Inventor
August Sturzenegger
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.)
F Hoffmann La Roche AG
Original Assignee
F Hoffmann La Roche AG
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 F Hoffmann La Roche AG filed Critical F Hoffmann La Roche AG
Priority to GB2370658A priority Critical patent/GB858485A/en
Publication of GB858485A publication Critical patent/GB858485A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/87—Preparation of ketenes or dimeric ketenes
    • C07C45/88—Preparation of ketenes or dimeric ketenes from ketones

Landscapes

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

Abstract

Ketene is prepared by the thermal decomposition of acetone in a pyrolysis vessel the inner surface of which is composed of a steel having the composition of from 14 to 18% chromium, a maximum of 0,12% carbon and the balance substantially entirely iron. The vessel may be made of "Sandvik" (Registered Trade Mark) 2c-34, in the form of a straight, serpentine, or coiled tube. In a preferred method, acetone is continuously passed in vapour form through such an elongated tube at about 700-800 DEG C. at a mass velocity of about 10,000 to 40,000 lbs./sq. in./hr. with a contact time of about 0,01 to 0,1 sec.; there is a pressure differential between the inlet and outlet of the tube of up to about 15 p.s.i. Examples of this method are given. Specifications 655,101, 662,356 and 668,268 are referred to.
GB2370658A 1958-07-23 1958-07-23 Improvements in or relating to the manufacture of ketene Expired GB858485A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2370658A GB858485A (en) 1958-07-23 1958-07-23 Improvements in or relating to the manufacture of ketene

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2370658A GB858485A (en) 1958-07-23 1958-07-23 Improvements in or relating to the manufacture of ketene

Publications (1)

Publication Number Publication Date
GB858485A true GB858485A (en) 1961-01-11

Family

ID=10199971

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2370658A Expired GB858485A (en) 1958-07-23 1958-07-23 Improvements in or relating to the manufacture of ketene

Country Status (1)

Country Link
GB (1) GB858485A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1244159B (en) * 1964-12-05 1967-07-13 Eastman Kodak Co Process and device for the production of ketenes by pyrolysis of compounds which can be cleaved to form ketenes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1244159B (en) * 1964-12-05 1967-07-13 Eastman Kodak Co Process and device for the production of ketenes by pyrolysis of compounds which can be cleaved to form ketenes

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