Process for obtaining a pure hydrocarbon from a sump product of

Details Process for obtaining a pure hydrocarbon from a sump product of Process for obtaining a pure hydrocarbon from a sump product of

1992-07-22

1993-08-10

Bascomb, Jr., Wilbur

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

203 78, 203 84, 202154, 585808, 585860, 585865, B01D 340, C07C 708

Patent

active

052345530

ABSTRACT:
Process for obtaining a pure hydrocarbon from a starting material containing the hydrocarbon including performing an extractive distillation of the starting material containing the hydrocarbon in an extractive distillation column using a solvent comprising an N-substituted morpholine having substituents with no more than seven carbon atoms; feeding the sump product of the extractive distillation column into a distillation separator column at an entry point in a center portion of the distillation separator column; distilling off the hydrocarbon from the top of the distillation separator column but advantageously returning a minor portion of it as a reflux; drawing off solvent from the sump of the distillation separator column; feeding the solvent drawn off from the sump of the distillation separator column into an evaporator to form a vapor in the evaporator at the pressure, p.sub.2, the pressure p.sub.2 in the evaporator being lower than the pressure p.sub.1 in the sump of the distillation separator column; condensing the vapor formed in the evaporator to form a condensate, feeding the condensate back to the distillation separator column and drawing off solvent as a liquid solvent from the sump of the evaporator and feeding back the liquid solvent to the extractive distillation column.

REFERENCES:
patent: 3232850 (1966-02-01), Renberg et al.
patent: 4201633 (1980-05-01), Paret et al.
patent: 4664783 (1987-05-01), Preusser et al.
patent: 4776927 (1988-10-01), Emmrich et al.

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