Distillation: processes – separatory – Adding material to distilland except water or steam per se – At least two materials
Patent
1977-04-06
1978-05-23
Bernstein, Hiram H.
Distillation: processes, separatory
Adding material to distilland except water or steam per se
At least two materials
203 62, 203 81, B01D 340
Patent
active
040909239
ABSTRACT:
A C.sub.4 -hydrocarbon feedstream containing butenes, butadiene, and vinylacetylene is subjected to a first extractive distillation with a selective solvent to remove butenes and a first portion of vinylacetylene as the extract; by the extraction with a minor quantity of methylethyl ketone in the selective solvent in this step, it has been found that a major portion of the vinylacetylene can be rejected, together with the butenes in the rich extract and that simultaneously the quantity of butadiene extracted could be considerably reduced; in a second extractive distillation the butadiene-rich raffinate of the first extractive distillation is further purified by extractive distillation using a mixture of sulfolane and methylethyl ketone as the solvent; after solvent stripping, the butadiene stream is finally purified in a fractionation step, wherein further vinylacetylene is removed.
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Carter Cecil O.
Haskell Donald M.
Bernstein Hiram H.
Phillips Petroleum Company
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