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Which catalyst is used in the packed stage reactor column for the manufacture of cumene via propylene alkylation of benzene?

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Which catalyst is used in the packed stage reactor column for the manufacture of cumene via propylene alkylation of benzene?

(a) Silver

(b) Copper

(c) Palladium

(d) H3PO4

I had been asked this question during an interview.

My doubt is from C3 Compounds in division Synthetic Organic Chemical Industries of Chemical Technology

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The correct answer is (d) H3PO4

The explanation: H3PO4 catalyst is used in the packed stage reactor column for the manufacture of cumene. The reactor is packed stage wise with H3PO4 impregnated catalyst. The catalyst maintains the temperature of the reaction to about 250°C.

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