PPE 2(QUART 2)

Question 1

BUTADIENE EXTRACTION PLANT
product is
withdrawn from the top of this column and the C5s as well as the 1,2-butadiene are
rejected in the bottoms.

Answer 1

butadiene

Question 2

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

Answer 2

Crude butadiene

Question 3

BUTADIENE EXTRACTION PLANT
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 3

flare system.

Question 3

BUTADIENE EXTRACTION PLANT
is continuously fed to the NMP regeneration section. The
solvent is heated with steam under vacuum conditions in a regeneration vessel.

Answer 3

A small solvent stream

Question 4

BUTADIENE EXTRACTION PLANT
is condensed and recycled to the extractive distillation section.
The remaining residue is usually incinerated

Answer 4

Vaporized NMP