Method for preparing stable, liquid tetrahydrophthalic anhydride

Details Method for preparing stable, liquid tetrahydrophthalic anhydride Method for preparing stable, liquid tetrahydrophthalic anhydride

1978-08-17

1980-05-20

Raymond, Richard

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

560127, C07D30724

Patent

active

042039053

ABSTRACT:
Tetrahydrophthalic anhydride for the preparation of polyesters is conveniently prepared in a stable, liquid form for transportation and storage by adding molten anhydride to a 100.degree. to 120.degree. C., C.sub.2 to C.sub.9 glycol at rate to maintain this temperature range without raising the temperature of the mixture in increments of more than 5.degree. F., reacting the mixture for a sufficient time to reduce the acid number of the mixture to a number in the range below the theoretical acid number for the half ester of the glycol and anhydride and 165; thereafter cooling the mixture to 155.degree. C., adding glycol as necessary to provide a mole ratio of glycol to anhydride in the range of 1.2 to 2:1 and cooling the mixture to a temperature in the range of 40.degree. to 70.degree. C.

REFERENCES:
patent: 3431223 (1969-03-01), Reymore et al.

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