Process of recovering an n-hexane product which is free from aro

Details Process of recovering an n-hexane product which is free from aro Process of recovering an n-hexane product which is free from aro

1978-10-10

1981-07-14

Sever, Frank

Distillation: processes, separatory

Adding material to distilland except water or steam per se

Organic compound

203 58, 203 62, 203 75, 203 77, 203 78, 203 82, 203 84, 203 93, 203 94, 208313, 585862, 585863, B01D 340

Patent

active

042785057

ABSTRACT:
A process of recovering an n-hexane product which is free from aromatic compounds by extractive distillation from a mixture of aromatic and non-aromatic compounds. The mixture is fed to and distilled in a first distillation column, from which a benzene-containing sump product and the overhead product consisting of non-aromatic compounds are withdrawn. The distillate is laterally withdrawn above the feeding point of the feed mixture and transferred to the upper portion of a second distillation column. The hexane cut is withdrawn as sump product from the second distillation column and fed to an extractive distillation column approximately in the middle thereof and is extracted in the extractive distillation column with a selective solvent which is fed above the feeding point of the hexane cut consisting of the sump product of the second distillation column. The sump product containing the selective solvent is withdrawn from the extractive distillation column and the overhead thereof vapors are condensed. The condensate is withdrawn as an n-hexane product that is free from aromatic compounds.

REFERENCES:
patent: 2325319 (1943-07-01), Durrum
patent: 2361493 (1944-10-01), Patterson
patent: 2842484 (1958-07-01), Fleck
patent: 2848387 (1958-08-01), Glazier et al.
patent: 3317627 (1967-05-01), King et al.
patent: 3415739 (1968-12-01), Eisenlohr et al.
patent: 3707575 (1972-12-01), Muller et al.
patent: 3725255 (1973-04-01), Barilli et al.

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