Process for producing biphenyltetracarboxylic dianhydrides

Details Process for producing biphenyltetracarboxylic dianhydrides Process for producing biphenyltetracarboxylic dianhydrides

1973-01-16

1976-02-24

Moatz, Harry I.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260515P, 260524R, 260524N, C07D30789

Patent

active

039404269

ABSTRACT:
A process for separating and purifying biphenyltetracarboxylic dianhdride isomers from a mixture of these isomers by fractional crystallization in aliphatic acid anhydrides or acetone. The isomeric mixture is obtained by heating biphenyltetracarboxylic acids, optionally in the presence of an aliphatic acid anhydride. The biphenyltetracarboxylic acids are obtained by oxidizing coupling dimers of o-xylene or by hydrolyzing coupling dimers of dimethyl phthalate.

REFERENCES:
patent: 3173947 (1965-03-01), Essen et al.
patent: 3179614 (1965-04-01), Edwards
patent: 3338923 (1967-08-01), Peterlein et al.
patent: R27296 (1972-02-01), Ichikawa et al.
Ichikawa et al., C. A., Vol. 74, 126336k.
Groggins, "Unit Processes Inorganic Synthesis," 4 edition, 1952, p. 658.

Affiliated with

Also associated with

Rating

Process for producing biphenyltetracarboxylic dianhydrides does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for producing biphenyltetracarboxylic dianhydrides, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for producing biphenyltetracarboxylic dianhydrides will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2079538