Production of alkylene glycols

Details Production of alkylene glycols Production of alkylene glycols

1977-11-14

1980-02-05

Bernstein, Hiram H.

Distillation: processes, separatory

Plural distillations performed on same material

Distillation of initial distillate

203 91, 568868, 568852, 560191, 560248, 562606, 562608, B01D 336

Patent

active

041871537

ABSTRACT:
According to the present invention an impure liquid containing ethylene glycol or propylene glycol, lower carboxylate esters of the glycol, water, carboxylic acid and glycol-azeotroping agent is treated for removal of substantially all of said glycol-azeotroping agent by a process which comprises distilling the impure liquid in a distillation zone to form an overheads product comprising water and glycol-azeotroping agent and a bottoms product comprising the glycol, esters and carboxylic acid, which is substantially free of said glycol-azeotroping agent, said bottoms product containing water in an amount of at least about 1 weight percent of the amount of water passed to said distillation zone with said impure liquid.

REFERENCES:
patent: 3262969 (1966-07-01), Clark et al.
patent: 3668239 (1972-06-01), Kollar
patent: 3689535 (1972-09-01), Kollar
patent: 3715389 (1973-02-01), Hoch
patent: 3743672 (1973-07-01), Kollar
patent: 3770813 (1973-11-01), Kollar
patent: 3778468 (1973-12-01), Kollar
patent: 3809724 (1974-05-01), Golden
patent: 3872164 (1975-03-01), Schmidt
patent: 4021311 (1977-05-01), Belker

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