Patent · US Expired

Process for the preparation of ketene

US4455439A · kind A · utility

7Cited by

4References

4Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Dieter Arnold · Königstein, DE
Jorg Bartels · Eppstein, DE
Heinrich Lenzmann · Kelkheim, DE
Gunter Jacobsen
Heinz Wendt
Manfred Stoltenberg · Frankfurt am Main, DE

Key dates

Filing date	Dec 4, 1981
Grant date	Jun 19, 1984
Priority date	—
Expiry date	Dec 4, 2001

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C45/90
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

In this process for the preparation of ketene by the thermal, catalytic cracking of acetic acid under reduced pressure, the hot cracked gases are cooled to approx. 0.degree. to -10.degree. C. and, in the course thereof, water, unreacted acetic acid and acetic anhydride are condensed. The quantity of acetic acid employed for the thermal cracking reaction should be 0.5 to 2.5 t.times.hours.sup.-1 .times.m.sup.-3, relative to the volume V of a shell-and-tube heat exchanger through which the cracked gas is passed. The pressure drop in the tubular heat exchanger should be 50 to 150 mbars and the surface/volume ratio should be 60 to 120 m.sup.-1.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.