Process for recovering CMOS

Details Process for recovering CMOS Process for recovering CMOS

Filed on

1977-03-28

Date issued

1980-02-12

Examiner

Killos, Paul J.

Patent Class

Organic compounds -- part of the class 532-570 series

SubClass

Organic compounds

SubSubClass

Carboxylic acids and salts thereof

Other Related Categories

C07C 5923, C07C 5142

Type

Patent

Status

active

Patent number

041884930

Description

ABSTRACT:
It is disclosed that water soluble salts of carboxyalkyloxy succinic acids can be obtained in a form containing less than usual contamination by alkaline earth metal and related substances by treating the contaminated salts with alkali metal carbonate and separating (e.g., filtering) at an elevated temperature and at a selected pH region. The most important factor in obtaining this improvement is the use of the proper separating temperature, preferably within the range of 70.degree.-125.degree. C., especially a temperature of about 100.degree. C. In addition, the use of certain conditions of pH minimizes side reactions.

REFERENCES:
patent: 4014929 (1977-03-01), Stahlheber

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