Method for extraction of dihydroperoxide
CA 1056407 A · Owner: Sumitomo Chemical Company · Inventors: Hosaka, Hirokazu; Tanimoto, Kenji; Dohgane, Iwao
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a method for extracting a dihydroperoxide of a dialkylbenzene of the formula wherein each R1, R2, R3 and R4 is independently isopropyl or sec butyl, from an aqueous alkali solution of the said dihydroperoxide with at least one organic solvent selected from the groups consisting of C4-C10 ketones, C4-C10 ethers and C4-C8 alcohols, which comprises extracting the dihydroperoxide by a countercurrent multi-stage extraction with a temperature gradient between each stage and with all of the extractions being conducted at a temperature of from 0° to 85°C the aqueous, alkali solution being fed to the lower temperature zone the, organic solvent being fed to the higher …
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 June 12, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 12, 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.