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- W90332123 abstract "Extractive distillation of butanes from butenes makes it easier to recover butene-1 and butene-2 as individual products. Large amounts of C/sub 4/ hydrocarbons are produced from steam crackers and catalytic crackers. Some of these C/sub 4/ fractions are isolated for use as chemical raw materials. For example, butadiene can be isolated by extraction. Isobutene can be selectively combined with methanol to make MTBE. To date, only a few plants use the residual C/sub 4/ raffinate (Raffinate 2) as chemical raw materials. Most of the Raffinate 2 has been burned as fuel. Until recently, a great deal of effort and expense were needed to separate butene-1 and butene-2 because their boiling points were very close to other C/sub 4/ fractions. But now there is an extractive distillation process, the Butenex Process, in which a solvent alters the vapor pressures of butanes and butenes, thus facilitating--or at least rendering possible--separation by distillation." @default.
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- W90332123 date "1989-01-01" @default.
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- W90332123 title "Recover butene-1 or -2 easier" @default.
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