Title:
METHOD OF PREPARING DIMETHYLCETENE AND, SUBSEQUENTLY, POLYDIMETHYLCETENE FROM ISOBUTYRIC ANHYDRIDE
Document Type and Number:
WIPO Patent Application WO2004076508
Kind Code:
A3
Abstract:
The invention relates to a method of preparing dimethylcetene (DMK) by pyrolysis of isobutyric anhydride (ANIB), consisting in: (a) pre-heating a mixture to between 300 and 340 DEG C at atmospheric pressure, said mixture comprising between 1 and 50 % volume ANIB for between 99 and 50 % inert gas respectively; (b) bringing said mixture to a temperature of between 400 and 550 DEG C for a contact time of between 0.05 and 10 s in order to obtain a mixture of DMK, inert gas, isobutyric acid (AIB) or unreacted ANIB; and (c) cooling (condensation step) the mixture produced in step (b) in order to separate the gaseous mixture comprising the DMK from the condensed ANIB and/or AIB.
Inventors:
HUB SERGE (FR)
MARTINO-GAUCHI GEORGES (FR)
LINEMANN REINHARD (FR)
LE GUILLAUME (FR)
MARTINO-GAUCHI GEORGES (FR)
LINEMANN REINHARD (FR)
LE GUILLAUME (FR)
Application Number:
PCT/FR2004/000399
Publication Date:
November 18, 2004
Filing Date:
February 20, 2004
Export Citation:
Assignee:
ATOFINA (FR)
HUB SERGE (FR)
MARTINO-GAUCHI GEORGES (FR)
LINEMANN REINHARD (FR)
LE GUILLAUME (FR)
HUB SERGE (FR)
MARTINO-GAUCHI GEORGES (FR)
LINEMANN REINHARD (FR)
LE GUILLAUME (FR)
International Classes:
C07C45/89; C07C49/88; C08F16/36; (IPC1-7): C07C45/89; C07C49/88
Foreign References:
| US3201474A | 1965-08-17 | |||
| US5169994A | 1992-12-08 | |||
| US5258556A | 1993-11-02 |
Other References:
PREGAGLIA G; BINAGHI M: "Polymerisation of dimethylketene. A. Dimethylketene by pyrolysis of isobutyric anhydride", MACROMOLECULAR SYNTHESES, vol. 1968, no. 3, 1969, pages 152 - 160, XP009016143
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