Removal of small amounts of a medium-boiling fraction from a liq

Details Removal of small amounts of a medium-boiling fraction from a liq Removal of small amounts of a medium-boiling fraction from a liq

1989-12-27

1991-02-19

Manoharan, Virginia

Distillation: processes, separatory

Plural distillations performed on same material

One a distillation under positive pressure or vacuum

203 77, 203 78, 203 80, 203 99, 203DIG9, 203DIG19, 568338, 568376, B01D 300

Patent

active

049941526

ABSTRACT:
Small amounts of a medium-boiling fraction are removed from a liquid mixture by distillation using a distillation column (main column) having a rectifying part and a stripping part, the liquid mixture containing relatively large amounts of lower-boiling and higher-boiling components, and the rectifying part being connected to the upper end of a second distillation column (side column) and the stripping part to the lower end of the said column, and the medium-boiling fraction being removed in vapor or liquid form from its middle section, by a process in which the concentration of the medium-boiling fraction in the liquid mixture is less than 2%, preferably less than 0.1%, and the amount of vapor passed into the lower end of the side column from the main column is 1-20%, preferably 3-10%, based on the amount of vapor in the main column at the relevant point.

REFERENCES:
patent: 4272326 (1981-06-01), Hertzog et al.
patent: 4306944 (1981-12-01), Murthy et al.
patent: 4448644 (1984-05-01), Foster et al.
patent: 4455198 (1984-06-01), Zudkevitch et al.
patent: 4606816 (1986-08-01), Harandi
patent: 4662995 (1987-05-01), Lipkin et al.
patent: 4744869 (1988-05-01), Saito et al.

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