1. In the column, the presence of dissolved salt my increase __________
a) Yield
b) Efficiency
c) Foaming
d) Residence time
Explanation: In the column, the presence of dissolved salt my increase Foaming.
2. Why is the possibility of clogging and plugging unlikely?
a) Because salt is in solid state
b) Because the concentration of water increases down the column
c) Because the concentration of water decreases down the column
d) Because the concentration of methanol increases.
Explanation:The possibility of clogging and plugging unlikely because the concentration of less volatile component like water increases down the column and thus it can dissolve salt.
3. Salt distillation can be applied to organic compounds that have little capacity of dissolving inorganic salts by using organic salts called?
a) Hydrotopes
b) Hygrotopes
c) Hydrostattic materials
d) Hydrating materials
Explanation: Salt distillation can be applied to organic compounds that have little capacity of dissolving inorganic salts by using organic salts called Hydrotopes. Example: Alali and alkaline salts of sulphonates of toluene.
4. When is the pressure swing distillation used?
a) When the binary azeotrope changes composition by 5mol% over a moderate range of pressure
b) When the binary azeotrope changes composition by 10mol% over a moderate range of pressure
c) When the binary azeotrope changes composition by 2mol% over a moderate range of pressure
d) When the binary azeotrope changes composition by 0.5mol% over a moderate range of pressure
Explanation:Pressure swing distillation is used when a binary azeotrope disappears or changes composition by 5mol% over a moderate range of pressure.
5. What is done in pressure swing distillation?
a) Two columns in series at same pressure
b) Two columns in parallel at same pressure
c) Two columns in series at different pressures
d) Two columns in parallel at different pressures
Explanation: Pressure swing distillations using two ordinary columns in series operating at different pressures.
6. Which of the following is an application of pressure swing distillation?
a) Tetrahydrofuran-water mixture
b) Hydrochloric acid-methanol mixture
c) Tetrahydrofuran-methanol mixture
d) Hydrochloric acid- tetrahydrofuran mixture
Explanation:The minimum boiling azeotrope of Tetrahydrofuran-water mixture is separated by pressure swing distillation.
7. Formic acid-water mixture is separated using:
a) Salt distillation
b) Extractive distillation
c) Differential distillation
d) Pressure swing distillation
Explanation: Formic acid-water mixture is separated using Pressure swing distillation.
8. Hydrochloric acid-water mixture is separated using:
a) Salt distillation
b) Extractive distillation
c) Differential distillation
d) Pressure swing distillation
Explanation: Hydrochloric acid-water mixture is separated using Pressure swing distillation.
9. Why is recycle ratio a key design factor?
a) Low cost of gas compression
b) High cost of gas compression
c) High equipment cost
d) High gas cost
Explanation: Due to the high cost of gas compression, the recycle ratio is key design factor.
10. What does recycle ratio depends on?
a) Variation of azeotropic composition with column pressure
b) Variation of pressure with composition
c) Cost of gas compression
d) Efficiency of instrument
Explanation: The recycle ratio depends on Variation of azeotropic composition with column pressure.