Patent · US Expired

Process for the purification of sulfonated aryl phosphines

US4623490A · kind A · utility

6Cited by

3References

7Claims

0Family size

Assignee

Ruhrchemie Aktiengesellschaft · DE

Inventors

Ludger Bexten · Hünxe, DE
Boy Cornils · Dinslaken, DE
Dieter Kupies · Duisburg, DE

Key dates

Filing date	Aug 27, 1985
Grant date	Nov 18, 1986
Priority date	—
Expiry date	Aug 27, 2005

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07F9/5054
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for the purification of salts of at least one member of the group consisting of diphenylphosphine-phenyl-m-sulfonic acid, phenylphosphine-di-(m-phenylsulfonic acid) and triphenylphosphine-tri-(m-sulfonic acid) from aqueous solutions thereof comprising adding at least a molar equivalent amount of at least one member of the group consisting of di-(n-pentyl)-amine, di-(n-hexyl)-amine and water-soluble salts of said amines to an aqueous solution containing at least one member of the group consisting diphenylphosphine-phenyl-m-sulfonic acid, phenylphosphine-di-(m-phenylsulfonic acid), triphenylphosphine-tri(m-sulfonic acid) and salts thereof to adjust the pH value to .ltoreq.7, recovering the precipitate, washing the precipitate and dissolving the same in an aqueous basic solution.

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