Process for preparing bisphenol a
CA 1305185 C · Owner: Mitsui Toatsu Chemicals, Inc. · Inventors: Morimoto, Yoshio; Iimuro, Shigeru; Kitamura, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to a process for preparing high purity bisphenol A comprising feeding continuously phenol and acetone in the presence of a hydrochloric acid catalyst into a reactor in a first stage and reacting phenol and acetone in the range of 20 - 60 mol% of acetone conversion removing, continuously the first reaction product from the reactor in the first stage, feeding the first reaction product into a reactor of batch type in a second stage and completing the reaction of phenol and acetone to obtain a second reaction product and removing unreacted phenol, water formed by the reaction and hydrochloric acid from the second reaction product and recovering bisphenol A.
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 July 14, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 14, 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.