Patent · US Expired

Phase transfer catalyst recovery

US5030757A · kind A · utility

1Cited by
6References
8Claims
0Family size

Assignee

Inventor

Key dates

Filing dateMay 7, 1990
Grant dateJul 9, 1991
Priority date
Expiry dateMay 7, 2010

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC07C209/86
  • WIPO fieldOrganic fine chemistry
  • WIPO sectorChemistry

Abstract

A quaternary ammonium salt catalyst is recovered from mixtures where the salt is in contact with an aqueous alkaline phase by adding water to completely dissolve the salt and adding base to cause the dissolved catalyst to separate as a hydroxide which forms an oily upper phase.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.