Separation of unsaturated hydrocarbons by extractive distillatio

Details Separation of unsaturated hydrocarbons by extractive distillatio Separation of unsaturated hydrocarbons by extractive distillatio

1991-07-17

1992-10-13

Manoharan, Virginia

Distillation: processes, separatory

Adding material to distilland except water or steam per se

At least two materials

203 56, 203 58, 203 63, 585809, 585860, 585865, B01D 340

Patent

active

051548020

ABSTRACT:
The separation of alkadienes from close-boiling alkenes by extractive distillation employs as solvent either N-(.beta.-mercaptoethyl)-2-pyrrolidone alone, or a mixture of N-(.beta.-mercaptoethyl)-2-pyrrolidone and either N-methyl-2-pyrrolidone or cyclohexanol, or a mixture of cyclohexanol and tetraethylene glycol. The separation of cycloalkadines from close-boiling alkadienes by extractive distillation employs N-(.beta.-mercaptoethyl)-2-pyrrolidone as solvent.

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