BUTADIENE EXTRACTION PLANT

Question 1

It is a C4 petrochemical used as raw material for synthetic ribbers such as styrene-butadiene rubber (SBR) primarily used for the production of automobile tires, for acrylonitrile-butadiene-styrene (ABS) used for appliances and automotive applications, and for styrene butadiene latex used for gloves, paper coatings and textiles.

Answer 1

Butadiene

Question 2

It is composed of various C4 hydrocarbons such as isobutylenes and butanes.

Answer 2

Raffinate-1

Question 3

It is mainly used for producing rubbers, as well as feedstock for the production of methyl-tert-butyl ether (MTBE) for gasoline blending.

Answer 3

Isobutylene

Question 4

it can also be produced from raffinate, and used as comonomer for polymer production

Answer 4

butene-1

Question 5

The _____ uses n-methyl-pyrrolidone (NMP) as solvent

Answer 5

NMP-based butadiene process

Question 6

it is the least toxic solvent that is easily treated by conventional biological degradation

Answer 6

NMP

Question 7

four basic process sections of a typical butadiene extraction plant

Answer 7

• extractive distillation
• conventional distillation
• solvent degassing
• solvent regeneration

Question 8

_____ is used separate components with similar volatilities. A solvent (NMP) is added to alter the relative volatility of components in a mixture.

Answer 8

Extractive distillation

Question 9

The _____ is sent to the extractive distillation section where it is vaporized and separated using two extractive distillation columns.

Answer 9

C4 feed

Question 10

In the butadiene extraction plant, the overhead product from the _____ consists of a mixture of butenes and butanes and is designated as raffinate-1.

Answer 10

first column

Question 11

The _____ is a dividing wall column consisting of a rectifier and an afterwasher.

Answer 11

second column

Question 12

The overhead from the afterwasher is a ____ product that is sent to the conventional distillation system for further purification.

Answer 12

crude butadiene

Question 13

In the butadiene extraction plant, it is removed from the bottom of the second column and sent to the solvent degassing system.

Answer 13

Rich solvent

Question 14

_____ is fed to the propyne column, which is the first of two columns in the conventional distillation section.

Answer 14

Crude butadiene

Question 15

C4 acetylenes are removed as a side stream and can be hydrogenated, used as fuel gas or as cracker feed, or burned in a _____

Answer 15

flare system

Question 16

_____ is condensed and recycled to the extractive distillation section.

Answer 16

Vaporized NMP