Photochlorination of phthalic anhydride

Details Photochlorination of phthalic anhydride Photochlorination of phthalic anhydride

1991-04-22

1994-04-05

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

C07D30700

Patent

active

053002016

ABSTRACT:
Phthalic anhydride can be photochlorinated in the vapor phase to give good yields of 4-chlorophthalic anhydride at temperatures of 250.degree. to 400.degree. C. Optionally, the process can be run to produce di, tri, and tetrachlorophthalic anhydrides.

REFERENCES:
patent: 3745103 (1971-05-01), Richtzenhain
patent: 4297283 (1981-10-01), Verbicky
Zweig et al. "3-Chlorophthalic Anhydride Through Chlorination of Phthalic Anhydride" American Chemical Society, 1978, p. 3690.

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