Toluic acid
CA 1186297 A · Owner: E. I. Du Pont De Nemours And Company · Inventors: Waller, Francis J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for oxidatively carbonylating toluene to toluic acid, at least 50 mol % of the toluic acid being the p-isomer, said process comprising contacting and reacting, at 110-250°C, at a pressure of at least 500 psi (3.45 MPa), toluene carbon, monoxide, oxygen and the catalyst ingredients consisting essentially of, (a) a compound of rhodium or iridium; (b) a sulfur oxy-acid or a Group Ia or IIa metal salt of a sulfur oxy-acid;, (c) a sulfur oxy-acid or sulfur oxy-acid mixture having a Hammett acidity value (-Ho) of greater than 7.0; and, (d) a cupric salt of a sulfur oxy-acid; said catalyst ingredients containing 0.3-30 mol % of (a) and 70-99.7 mol % of (b + c + d), with the molar ratios …
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
- Granted April 30, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 30, 2002.
- 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.