Engineering Questions with Answers - Multiple Choice Questions
Chemical Technology MCQ’s – C3 Compounds – Cumene
1 - Question
How is cumene manufactured?
a) Propylene alkylation of benzene
b) Catalytic hydrogenation of isopropanol
c) Oxidation of butane
d) Oxidation of propylene
Explanation: Catalytic hydrogenation of isopropanol, Oxidation of butane and Oxidation of propylene are for the manufacture of acetone. Cumene is manufactured from polypropylene propane mixed with benzene.
2 - Question
How can we minimize the formation of polyalkylbenzene in the manufacture of cumene?
a) Using low benzene and propylene feed
b) Using high benzene and propylene feed
c) Using a high-end catalyst
d) Using a low-end catalyst
Explanation: Minimization of polyalkylbenzene is possible by using high benzene and propylene feed around 5:1 ratio or even higher and the propane dilution method.
3 - Question
Which catalyst is used in the packed stage reactor column for the manufacture of cumene via propylene alkylation of benzene?
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.
4 - Question
Tubular reactor design is better than stage wise design the manufacture of cumene via propylene alkylation of benzene.
Explanation: Stage wise packed tower with propane sensible heat quench was designed, but tubular reactor design provides better sensible heat. Propane acts as an inert component.
5 - Question
Which among the following is the molecular formula of cumene?
Explanation: C9H12 is the molecular formula of cumene. C3H8O is the molecular formula of isopropanol. CH3COOH is the molecular formula of acetic acid, whereas CH3CH2COOH is the molecular formula of propanoic acid.