Process for the mononitration of anthraquinone
CA 1106368 A · Owner: Bayer Aktiengesellschaft · Inventors: Wunderlich, Klaus; Hohmann, Walter; Seidler, Helmut
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Bayer 3227, PROCESS FOR THE MONONITRATION OF ANTHRAQUINONE Abstract of the Disclosure, A process has been developed for the mononitration of anthraquinone to 1-nitroanthraquinone with nitric acid/ sulphuric acid mixtures wherein anthraquinone is nitrated in a nitric acid/sulphuric acid mixture, in which the weight ratio of nitric acid to sulphuric acid is about 1:1 to about 2:1, in which the weight ratio of sulphuric acid to anthraquinone is about 0.5:1 to about 1:1 and in which the weight ratio of sulphuric acid to water is about 2.5:1 to about 5.5:1, the weight ratios relating to the sum of the materials employed, at temperatures in the range from about 45 to 70°C until the anthraquinone …
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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 August 4, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 4, 1998.
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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.