Method for purifying tetrahydrofuran by distillation

Distillation: processes – separatory – Plural distillations performed on same material – One a distillation under positive pressure or vacuum

Reexamination Certificate

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C203S014000, C203S078000, C203S099000, C203SDIG019, C549S429000, C549S509000

Reexamination Certificate

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10505774

ABSTRACT:
Crude water-containing tetrahydrofuran is purified by passing the crude tetrahydrofuran through three distillation columns, withdrawing water from the bottom of the first column, recycling water-containing tetrahydrofuran from the top of the second column into the first column, passing a sidestream of the first column into the second column, recycling the bottom product of the third column into the first column, and withdrawing a distillate at the top of the first column. Additionally, a sidestream of the second column is passed into the third column and the purified tetrahydrofuran is recovered as the top product of the third column.

REFERENCES:
patent: 4332645 (1982-06-01), Mueller et al.
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patent: 5030328 (1991-07-01), Fischer et al.
patent: 6780289 (2004-08-01), Godbole
patent: 6846389 (2005-01-01), Kaibel et al.
patent: 29 30 144 (1981-02-01), None
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patent: 100 21703 (2001-11-01), None
Translation of JP 2639463.
Translation of JP 2639464.
Translation of JP 2639463, Published: Aug. 13, 1997.
Translation of JP 2639464, Published: Aug. 13, 1997.

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