Process for fractionating water-containing crude amine...

Details Process for fractionating water-containing crude amine... Process for fractionating water-containing crude amine...

2005-07-05

2005-07-05

Manoharan, Virginia (Department: 1764)

Distillation: processes, separatory

With disparate physical separation

Utilizing liquid-liquid extracting of distillation product

C203S014000, C203S078000, C203S080000, C203S099000, C203SDIG001, C564S497000

Reexamination Certificate

active

06913674

ABSTRACT:
A mixture containing one or more amines, water, low-boilers and high-boilers, is fractioned in a process wherein(i) low-boilers are separated from the mixture by distillation,(ii) high-boilers are separated from the mixture by distillation,(iii) the mixture is extracted with a sodium hydroxide solution to form an aqueous, sodium-hydroxide-containing first phase and an aqueous-organic, amine-containing second phase, and(iv) the aqueous-organic second phase is distilled to form an amine/water azeotrop and an essentially anhydrous amine, and the amine/water azeotrop is recycled to the extraction step (iii).

REFERENCES:
patent: 2690378 (1954-09-01), Penneman
patent: 3850760 (1974-11-01), Lenel et al.
patent: 5035775 (1991-07-01), Quackenbush et al.
patent: 5074967 (1991-12-01), Fowlkes
patent: 5175369 (1992-12-01), Fowlkes
patent: 5192399 (1993-03-01), Sieja
patent: 6547933 (2003-04-01), Marion et al.

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