Process for purifying acetic acid

Details Process for purifying acetic acid Process for purifying acetic acid

1996-03-06

1997-09-02

Nessler, Cynthia L.

Distillation: processes, separatory

Plural distillations performed on same material

Distillation of initial distillate

203 83, 203 85, 562607, 562608, B01D 336

Patent

active

056627807

ABSTRACT:
A process for purifying acetic acid which comprises: introducing a feedstock aqueous solution of acetic acid having an acetic acid concentration of from 10 to 50% by weight into an extractor; supplying an extracting medium containing isopropyl acetate in an amount from 0.6 to 3.0 times by weight the amount of the feedstock solution thereinto in such a manner that the extracting medium is made in contact with the feedstock solution; extracting acetic acid into the extracting medium; separating the extracting medium containing acetic acid from an extraction residue; supplying the extraction medium containing acetic acid into an azeotropic distillation column; distilling off the isopropyl acetate contained in the extraction medium from a top of the azeotropic distillation column via azeotropic distillation with water; condensing a distillate from the top of the azeotropic distillation column, to divide the distillate into a water-poor phase being rich in isopropyl acetate and a water-rich phase being rich in water; returning at least a portion of the water-poor phase into the extractor as the extracting medium; and recovering the acetic acid, which has been thus dehydrated and purified, from a bottom of the azeotropic distillation column.

REFERENCES:
patent: 998234 (1911-07-01), Crossley et al.
patent: 1698798 (1929-01-01), Legendre
patent: 2384374 (1945-09-01), Harrison
patent: 2438300 (1948-03-01), Schniepp
patent: 2651605 (1953-09-01), Hartley et al.
patent: 2698285 (1954-12-01), Burton
patent: 2878283 (1959-03-01), Othmer
patent: 2893923 (1959-07-01), Luke, Jr. et al.
patent: 3052610 (1962-09-01), Akaboshi et al.
patent: 3347756 (1967-10-01), Snell
patent: 3404175 (1968-10-01), Mercier
patent: 3772156 (1973-11-01), Johnson et al.
patent: 3791935 (1974-02-01), Eubanks et al.
patent: 4143066 (1979-03-01), Kalcevic

Affiliated with

Also associated with

Rating

Process for purifying acetic acid does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for purifying acetic acid, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for purifying acetic acid will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-305173