Process for the preparation of acyloxybenzenesulfonic acids and their salts
CA 1292013 C · Owner: Reinhardt, Gerd · Inventors: Reinhardt, Gerd; Grabley, Fritz-Feo; Steinl, Roland
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The process for the preparation of acyloxybenzenesulfonic acids of the general formula, in which R denotes a (C1-C17)-alkyl or (C2-C17)-alkenyl radical, or alkali metal, alkaline earth metal or ammonium salts thereof, is carried out in the following stages: (a) sulfonation of phenol, (b) heat treatment of the phenolsulfonic acid formed as the intermediate product, (c) esterification of the phenolsulfonic acid and if appropriate, (d) neutralization of the resulting (C2- C18)-acyloxybenzenesulfonic acid. As a result of the incorporation of stage (b), the process affords products in which the proportion of the 1,4-isomer compared with the 1,2-isomer is markedly increased, as a result of which …
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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 November 12, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 12, 2008.
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Timeline
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.