Process for preparing dinitrobenzophenones

Details Process for preparing dinitrobenzophenones Process for preparing dinitrobenzophenones

C - Chemistry, Metallurgy

07

C

260/578.4

C07C 45/28 (2006.01) C07C 2/68 (2006.01)

Patent

CA 1191867

PROCESS FOR PREPARING DINITROBENZOPHENONES Abstract of the Disclosure A process for preparing dinitrobenzophenones which comprises reacting benzene with ethylene in the presence of an alkylation catalyst to obtain an alkyla- tion product containing unreacted benzene, ethylbenzene, polyethylbenzenes, 1,1-diphenylethane and heavier products, separating benzene, ethylbenzene and poly- ethylbenzenes from said alkylation product, recovering from the remainder of said alkylation product a fraction whose boiling points fall within the temperature range of about 260° to about 290°C., reacting said fraction with nitric acid at a temperature within the range of about 130° to about 210°C., wherein the molar ratio of nitric acid to said fraction is in the range of about 3:1 to about 8:1, and thereafter reacting the total resulting reaction product with nitric acid in oleum to obtain a nitration product predominating in dinitro- benzophenones.

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