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Which method is used for the manufacture of industrial acrylonitrile?

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Which method is used for the manufacture of industrial acrylonitrile?

(a) Propylene-ammonia-air oxidation process

(b) Catalytic dehydrogenation of isopropanol

(c) Propylene alkylation of benzene

(d) Contact process

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I'm obligated to ask this question of C3 Compounds topic in chapter Synthetic Organic Chemical Industries of Chemical Technology

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Correct option is (a) Propylene-ammonia-air oxidation process

Best explanation: A C3 refinery is introduced along with ammonia and air via sprangers into a fluidized bed catalytic reactor. Acetone is manufactured by Catalytic dehydrogenation of isopropanol. Cumene is manufactured by propylene alkylation of benzene. Contact process is to produce sulfuric acid.

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