Process for, respectively, the production and purification of di

Details Process for, respectively, the production and purification of di Process for, respectively, the production and purification of di

1981-04-15

1983-01-25

Raymond, Richard

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

544345, 548430, 549 44, 549233, 549234, 549235, 549239, 549241, 549245, 549247, 549262, C07D30760, C07D49304

Patent

active

043704875

ABSTRACT:
A method of preparation and/or purification of acid anhydrides is disclosed. Dicarboxylic or polycarboxylic acids contained in the anhydrides to be treated, are dehydrated in an organic solvent in the presence of activated carbon.

REFERENCES:
patent: 1693915 (1928-12-01), Brode et al.
patent: 1852782 (1932-04-01), Jaeger
patent: 2518312 (1950-08-01), Hartig
patent: 2985665 (1961-05-01), Lawn et al.
patent: 3544602 (1970-12-01), Nohe et al.
patent: 3927039 (1975-12-01), Dehault et al.
patent: 3948956 (1976-04-01), Handrick

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