Process for removing 1,4-naphthoquinone from phthalic anhydride

Details Process for removing 1,4-naphthoquinone from phthalic anhydride Process for removing 1,4-naphthoquinone from phthalic anhydride

1975-10-29

1977-05-31

Jiles, Henry R.

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

2603467, C07D30789

Patent

active

040267709

ABSTRACT:
1,4-NAPHTHOQUINONE IS REMOVED FROM PHTHALIC ANHYDRIDE BY HEATING WITH ELEMENTARY SULFUR AT TEMPERATURES IN THE RANGE OF FROM 200.degree. TO 300.degree. C.

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