Distillation: processes – separatory – Plural distillations performed on same material – Including the addition of water or steam
Patent
1992-08-12
1994-01-04
Bascomb, Jr., Wilbur
Distillation: processes, separatory
Plural distillations performed on same material
Including the addition of water or steam
203 96, 560 41, 562608, 562609, 585807, 585868, B01D 336
Patent
active
052757021
ABSTRACT:
The present invention discloses a method to separate each component from a mixed solution of organic solvents obtained during the production of .alpha.-L-aspartyl-L-phenylalanine methyl ester, which is useful as a sweetener, namely, a mixed solution of acetic acid and toluene or a mixed solution of acetic acid, toluene and formic acid, recovering each component with a high recovery ratio with as small number of operations as possible. The method rationalizes the process and is highly valuable in practical use.
When each component is separated and recovered from a mixed solution containing acetic acid and toluene as the main components, acetic acid and toluene are separated by azeotropic distillation using water as an azeotropic solvent, and when each component is separated and recovered from a mixed solution containing acetic acid, toluene and formic acid as the main components, (a) the mixed solution is distilled and formic acid is recovered from the top of the column and a mixed solution of acetic acid and toluene is recovered from the bottom of the column; and (b) the mixed solution obtained from the bottom is distilled by using water as an azeotropic solvent and toluene is recovered from the top of the column and acetic acid is recovered from the bottom of the column.
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Kataoka Takehiko
Kawasaki Haruo
Kishimoto Shin-ichi
Ohura Harutoshi
Uchida Yoshinobu
Ajinomoto Co. Inc.
Bascomb, Jr. Wilbur
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