Water extractive distillation of olefinically unsaturated nitriles
CA 1182773 A · Owner: Solutia Inc. · Inventors: Lovett, Gordon H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for purifying crude olefinically unsaturated nitrile, especially acrylonitrile, by extractively distilling the crude nitrile in the presence of water. Water is supplied to two locations within the extractive distillation column. High purity water is added to the top of the extractive distillation column while a portion of the water required for extractive distillation is added as a low purity water stream added to the extractive distillation column between the feed point and pure water addition point.
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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 19, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 19, 2002.
- 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.