Process for the preparation of hexahydrophthalic acid anhydride

Details Process for the preparation of hexahydrophthalic acid anhydride Process for the preparation of hexahydrophthalic acid anhydride

1979-05-23

1981-01-13

Reamer, James H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260546, 2603466, 2603467, C07D30789

Patent

active

042448778

ABSTRACT:
A process for the preparation of hexahydrophthalic acid anhydride which comprises hydrogenation .DELTA..sup.4 -tetrahydrophthalic acid anhydride in the liquid phase at a temperature of from 70.degree. to 150.degree. C. and at a pressure of from 30 to 200 bar in the presence of a catalyst selected from palladium, ruthenium, nickel or mixtures thereof arranged in a fixed bed, wherein the catalyst is applied to a carrier of alumina of which at least 20% by weight has been converted into lithium aluminium spinel and the liquid phase is a mixture of .DELTA..sup.4 -tetrahydrophthalic acid anhydride and hexahydrophthalic anhydride in a proportion by weight of from 1:1 to 1:100.

REFERENCES:
patent: 2601075 (1952-06-01), Wichlaty et al.
patent: 2794811 (1957-06-01), Winstrom
patent: 3169975 (1965-02-01), Schulz
patent: 3819658 (1974-06-01), Gormley et al.
patent: 3957688 (1976-05-01), Farha et al.

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