Traditionally, purification efforts use extractive distillation
with a solvent to separate high-purity butadiene from crude C4
streams. The process is energy intensive. Newer processing methods
can reduce energy requirements and also lower investment costs.
Divided-wall technology enables operating two distillation steps in
one device. Thus, fewer heat exchangers and less peripheral
equipment is needed to perform the same operation.
Classic process. The butadiene extraction process is based
on extractive distillation technology using N-methyl-pyrrolidone as
the solvent. Evaporated crude C4 (Fig. 1) first passes to the
absorber section, which consists of the mainwasher, rectifi
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