Process for purifying caprolactam
CA 1309404 C · Owner: Ferruzzi, Sergio · Inventors: Senni, Paolo; Ferruzzi, Sergio; Zuliani, Leandro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for purifying caprolactam (CL) obtained by Beckmann transposition or by nitrosation of cyclohexylic compounds characterized in that it is performed in the following steps: (a) the caprolactam oil is treated with ammonia up to a pH comprised between 8 and 10 and at least one surfaceactive agent is added; (b) the caprolactam in aqueousammoniacal solution obtained in (a) is extracted with toluene; (c) the caprolactam in toluene solution according to (b) is extracted with water; (d) the product extracted in (c) is dehydrated by water distillation and is rectified in vacuum, in packed columns, with separation of the lowboiling and high-boiling …
Read the whole patent
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 27, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 27, 2009.
- 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.