Azeotropic nitration of benzene
CA 1064524 A · Owner: E.I. Du Pont De Nemours And Company · Inventors: Dassel, Mark W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the mononitration of benzene wherein the nitration is carried out at temperatures of at least 120°C. in mixed HNO3-H2SO4 and excess water is carried overhead as an azeotrope with part of the benzene and is then decanted from the benzene, The heat of nitration can be used to vaporize the azeotrope. The nitrated benzene product is removed as bottoms and decanted from the acid phase. This avoids the necessity of reconcentrating the H2SO4. - 1 -
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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 16, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 16, 1996.
- 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.