Engineering Questions with Answers - Multiple Choice Questions
Chemical Technology MCQ’s – C2 Compounds – Ethylene Oxide
1 - Question
What is the molecular weight of ethylene oxide?
a) 43
b) 44
c) 45
d) 46
View Answer
Explanation: Chemical formula of ethylene oxide is CH2OCH2. It contains 2 carbon atoms, 4 hydrogen atoms, and 1 oxygen atom 12, 1, and 16 as their atomic weights respectively. Hence the molecular weight is 12*2+4*1+16*1 = 43.
2 - Question
Identify i, ii, iii, and iv in the process of direct oxidation of ethylene using following hints.
i -> Effluent gases from reactor are sent directly into this tower.
ii-> Absorbed component in column A is removed in B.
iii-> Light ends is removed.
iv->Ethylene oxide is obtained at the top of the tower.
a) i-stripper, ii-water absorber, iii-desorber, iv-refining still b) i-water absorber, ii-desorber, iii-stripper, iv-refining still c) i- desorber, ii-water absorber, iii-refining still, iv-stripper d) i-refining still, ii-desorber, iii-stripper, iv-water absorber
View Answer
Explanation: Ethylene and oxygen are compressed and sent into reactor along with catalyst and suppressing agent. Effluent gases from reactor are sent into water absorber for water-washing followed by desorber to remove water. Then light ends are removed in stripper, while ethylene oxide and high ends are separated in refining still.
3 - Question
Which reagent is used as suppressing agent in direct oxidation of ethylene?
a) Ethylene oxide
b) Ethylene chloride
c) Ethylene dichloride
d) Ethylene
View Answer
Explanation: Ethylene dichloride is used as suppressing agent in direct oxidation of ethylene to suppress the side reaction which produces carbon dioxide and water instead of ethylene oxide.
4 - Question
Catalyst used in direct oxidation of ethylene is __________________
a) Magnesium oxide
b) Sodium oxide
c) Silver oxide
d) Manganese oxide
View Answer
Explanation: Silver oxide or alumina (inert carrier) is used as catalyst in direct oxidation of ethylene. To reduce/avoid side reaction, suppressing agent is also used.
5 - Question
Which type of reactor is used in ethylene oxide manufacturing process?
a) Catalytic reactor
b) Liquid phase reactor
c) Fluidized bed reactor
d) Fixed bed reactor
View Answer
Explanation: Ethylene and oxygen are compressed and sent into a tubular fixed bed reactor since it is highly exothermic reaction along with catalyst and suppressing agent.