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Speight_Part II_B 11/7/01 3:11 PM Page 2.96

2.96 MANUFACTURE OF CHEMICALS

Solvent
C olefins Propyne Butadiene
4

Solvent

Higher
molecular
weight
products

C acetylenes
4
Solvent
C feedstock
4
Solvent

FIGURE 1 Butadiene manufacture from a refinery C 4 stream.

Butenes

Propyne

Absorber

Feedstock Purifier
Scrubber Butadiene

C olefins
Stripper Stripper
5
Solvent

FIGURE 2 Butadiene recovery using N-methyl-2-pyrollidone (NMP).