Process for the production of dihydric phenols
CA 1291168 C · Owner: Mitsui Chemicals, Incorporated · Inventors: Ogino, Takao; Takeda, Masayuki; Arita, Shunji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the production of dihydric phenoles by oxidizing diisopropylbenzenes, which comprises oxidizing diisopropylbenzenes with molecular oxygen to obtain a reaction product mixture (A) containing at least diisopropylbenzene dihydroperoxide (DHP) and diisopropylbenzene monocarbinol monohydroperoxide (HHP), supplying said product mixture (A) in a form of oily phase as a solution in an aromatic hydrocarbon solvent to an agitation reactor, supplying thereto at the same time as an, aqueous phase, hydrogen peroxide at a feed rate of 1 - 5 moles per mole of HHP contained in the product mixture and an acid catalyst in an amount sufficient to reach a concentration in the aqueous phase of 10 …
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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 October 22, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 22, 2008.
- 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.