Chemical Engineering - Fertiliser Technology

41. 

Prilling tower is found in the flowsheet for the manufacture of

A. ammonia
B. urea
C. superphosphate
D. triple superphosphate

Answer: Option B

Explanation:

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42. 

Reaction of orthophosphoric acid with soda ash produces

A. sodium tripolyphosphate (STPP)
B. tricresyl phosphate
C. tributyl phosphate
D. nitrophosphate

Answer: Option A

Explanation:

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43. 

Urea is formed only

A. in liquid phase
B. in vapour phase
C. at very high temperature
D. at very low pressure (vacuum)

Answer: Option A

Explanation:

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44. 

Dehydration of ammonium carbamate (to produce urea) is a/an __________ reaction.

A. reversible
B. catalytic
C. exothermic
D. endothermic

Answer: Option D

Explanation:

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45. 

Electric process as compared to wet process (for the manufacture of phosphoric acid)

A. can use only high grade phosphate rock.
B. is used less frequently.
C. produces a valuable by-product called gypsum.
D. is weak acid process.

Answer: Option B

Explanation:

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