INCREASED SELECTIVITIES IN THE OXIDATION OF OLEFINS TO .alpha..beta.-UNSATURATED CARBOXYLIC ACIDS
CA 1238053 A · Owner: Sun Refining And Marketing Company · Inventors: Lyons, James E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Olefins such as propylene are oxidized directly to .alpha..beta.-unsaturated carboxylic acids such as acrylic acid with air or oxygen in an aqueous medium, employing an activated palladium-on-carbon catalyst in the, presence of a free radical inhibitor such as butylated hydroxytoluene. The catalyst pretreatment consists of reducing it with propylene at temperatures of at least about 60°C for at least about 10 minutes in the substantial absence of oxygen. In a like manner isobutylene may be oxidized to methacrylic acid while butene-1 May be oxidized to crotonic acid.
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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 June 14, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 14, 2005.
- 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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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.