Process for purifying hexamethylenediamine

Details Process for purifying hexamethylenediamine Process for purifying hexamethylenediamine

1980-08-21

1981-08-04

Doll, John

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

Organic compounds

Amino nitrogen containing

260707, C07C 8526

Patent

active

042823811

ABSTRACT:
Hexamethylenediamine (HMD) is purified by dissolving ammonia in crude molten HMD under pressure, directing the solution thus prepared to a reduced pressure zone where the ammonia is vaporized thereby causing a portion of the HMD to crystallize following which the crystals in the slurry are washed with essentially pure HMD. This purified HMD is suitable for conversion into polyamide fibers.

REFERENCES:
patent: 2889256 (1959-06-01), Campbell
patent: 2987452 (1961-06-01), Campbell et al.
patent: 3193472 (1965-07-01), Isacks
patent: 3370082 (1968-02-01), Eisfeld et al.
patent: 3696153 (1972-10-01), Kershaw et al.
patent: 3801370 (1974-04-01), Porter et al.
patent: 3839408 (1974-10-01), Arend et al.

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