Preparation of resorcinol and substituted resorcinols by liquid-phase dehydrogenation of 1,3-cyclic diones derived from vapor-phase cyclization of delta- keto carboxylic acid esters
CA 1185619 A · Owner: Koppers Company, Inc. · Inventors: Greco, Nicholas P.
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PREPARATION OF RESORCINOL AND SUBSTITUTED RESORCINOLS BY LIQUID-PHASE DEHYDROGENATION OF 1,3-CYCLIC DIONES DERIVED BY VAPOR-PHASE CYCLIZATION OF DELTA-KETO CARBOXYLIC ACID ESTERS Abstract of the Invention, A process is disclosed for making resorcinol and substituted resorcinols by a first reaction step of vapor phase cyclization of a delta-keto carboxylic acid ester over a carbon catalyst bed to form a 1,3-cyclic dione intermediate. The delta-keto ester is conveyed through the catalyst bed by a vaporized carrier characterized by being liquid at 25°C and having a sufficiently high boiling point that the vaporized carrier is easily condensable under ambient conditions. In a second reaction …
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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 April 16, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 16, 2002.
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