Process for the production of butane-1,4-diol
CA 1249837 A · Owner: Davy Mckee (London) Limited · Inventors: Carter, Anthony B.; Sharif, Mohammad; Turner, Keith
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PROCESS FOR THE PRODUCTION OF BUTANE-1,4-DIOL Butane-1,4-diol is produced by vapour phase hydrogenolysis of an alkyl ester of a C4 dicarboxylic acid, e.g. diethyl maleate, over a reduced Cu-Cr or Cu-Zn mixed oxide catalyst. Two adiabatic hydrogenolysis zones are used. The mixture exiting the first of these zones is cooled (by, for example, 5°C) and the resulting cooled mixture is fed to the second zone in which it reequilibriates at a lower temperature to increase the butane-1,4-diol yield at the expense of gammabutyrolactone. Typical reaction conditions include use of temperatures of 150°C to 200°C, pressures of 25 to 70 bar and an H2:ester molar ratio of 100:1 to 800:1. When using a …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 7, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 7, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.