Method for purifying an organic solvent for the purposes of...

Details Method for purifying an organic solvent for the purposes of... Method for purifying an organic solvent for the purposes of...

2005-07-26

2005-07-26

Dentz, Bernard (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C549S258000, C549S259000

Reexamination Certificate

active

06921830

ABSTRACT:
In a process for purifying an organic solvent for the absorption of maleic anhydride from a gaseous mixture, in which the maleic anhydride is separated off from the solvent, a substream is taken from the solvent stream, this substream is distilled and returned to the solvent circuit, the proposed improvement comprises separating off a low-boiling fraction and a high-boiling fraction from the fraction consisting essentially of purified solvent and feeding the fraction consisting essentially of purified solvent back into the solvent stream.

REFERENCES:
patent: 4118403 (1978-10-01), White
patent: 459 543 (1991-12-01), None
patent: 897 905 (1999-02-01), None
patent: 96/29323 (1996-09-01), None

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