Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil

Vacuum maintained in the vacuum distillation tower of the crude distillation plant is about __________ mm Hg (absolute).

A

5-10

B

30-80

C

150-250

D

350-400

The vacuum maintained in vacuum distillation unit for reduced crude is about __________ mmHg.

A

1.2

B

12

C

120

D

700

Crude oil is subjected to vacuum distillation in the last stage, because

A

High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose

B

Lighter/low boiling products are prone to thermal decomposition

C

High purity products can be obtained thereby

D

None of these

In catalytic cracking process, olefins crack __________ times faster than in thermal cracking process.

A

100

B

200-300

C

1000-10000

D

10

Paraffin base crude oil as compared to asphalt base crude gives

A

Higher yield of straight run gasoline

B

Higher octane number gasoline

C

Lower viscosity index lube oil

D

Poorer yield of lube oil

Vacuum maintained in the vacuum distillation column in oil refinery is in the range of about __________ mm Hg absolute.

A

1 to 5

B

30 to 80

C

250 to 350

D

450 to 500

__________ catalytic reaction is involved in the thermal cracking of gas oil.

A

Homogeneous

B

Homogeneous non

C

Heterogeneous

D

Heterogeneous non

The terminology used for the bottom most product from the vacuum crude distillation unit is

A

Residual crude

B

Residuum

C

Reduced crude

D

Petrolatum

Natural gas recovered along with crude oil from oil wells is called wet natural gas which has a higher __________ compared to the dry natural gas.

A

Unsaturated hydrocarbon content

B

Calorific value

C

Quantity of propane

D

Quantity of butane

__________ base crude oil is also called asphaltic crude.

A

Paraffinic

B

Naphthenic

C

Mixed

D

Aromatic

Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil

Related Questions