Purification of compounds having high melting point

Details Purification of compounds having high melting point Purification of compounds having high melting point

1980-08-04

1982-04-06

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

Plural distillations performed on same material

One a filming distillation

203 87, 203 89, 203 91, 203DIG25, 202153, 202176, 260369, 260378, B01D 122, B01D 310, C07C 9724

Patent

active

043234313

ABSTRACT:
A high melting, high boiling organic compound is easily and stably purified by continuously supplying the molten organic compound to a rectification zone under a subatmospheric pressure and continuously distilling off and recovering vapors from the top of the rectification zone, while continuously withdrawing bottoms containing higher boiling impurities and/or involatile impurities than the desired compound from a reboiling zone at the bottom of the rectification zone to the outside of rectification system by means of a barometric leg, without any pretreatment of removing lower boiling impurities therefrom before the rectification, and without disturbing a pressure balance in the rectification system.

REFERENCES:
patent: 1982598 (1934-11-01), Sieck
patent: 2312811 (1943-03-01), Gentil
patent: 2490659 (1949-12-01), Snyder
patent: 2645661 (1953-07-01), Taylor et al.
patent: 2716446 (1955-08-01), Ross
patent: 2887441 (1959-05-01), Eriksson
patent: 3385768 (1968-05-01), Yost
patent: 4009188 (1977-02-01), Heim et al.
patent: 4141799 (1979-02-01), Thelen et al.
patent: 4162946 (1979-07-01), Thelen et al.

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