Process for preparing succinic anhydride
CA 2227357 A1 · Owner: Bayer Aktiengesellschaft · Inventors: Darsow, Gerhard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Maleic anhydride can be hydrogenated to succinic anhydride with particularly high conversion rates by a catalytic liquid-phase hydrogenation with hydrogen by carrying, out the hydrogenation continuously at a pressure of 10 to 400 bar and a reactiontemperature of 60 to 180°C on oxygen-free and support-free shaped bodies which are, arranged in the fixed bed, of compressed powders of the elements of the iron sub-group of group VIII of the Periodic Table mixed or alloyed with elements oftransition group IV and/or V; in addition hydrogenation-inert elements can be present. The shaped bodies have a compressive strength of 20 to 220 N and an internal surface area of 10 to 100 m2/g.
Read the whole patent
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
- Filed January 19, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 19, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 19, 2020.
- 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
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.