Process for the production of high-purity tetrachloro -1,4-benzoquinone
CA 1313878 C · Owner: Arndt, Otto · Inventors: Papenfuhs, Theodor; Arndt, Otto
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 high-purity tetrachloro- 1,4-benzoquinone by the action of chlorine and hydrochloric acid on hydroquinone which comprising causing 1.9 to 2.1 times the molar quantity of gaseous chlorine to act at temperatures from 5 to 15°C on 1 mol of hydroquinone in 6 to 7 times the molar quantity of 30 to 37 % hydrochloric acid, then diluting the resulting suspension essentially containing 2,5-dichlorohydroquinone with 2, to 3 parts of water, relative to hydroquinone employed and initially warming to a temperature from 20 to 30°C subsequently introducing 1.9 to 2.1 times the molar quantity of chlorine gas in an air atmosphere while raising the temperature to 90-100°C with …
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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 February 23, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 23, 2010.
- 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.