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    • 31. 发明授权
    • Distillation method of separating organic solvents
    • 分离有机溶剂的蒸馏方法
    • US5275702A
    • 1994-01-04
    • US928298
    • 1992-08-12
    • Takehiko KataokaHaruo KawasakiHarutoshi OhuraYoshinobu UchidaAkihiko YasakiShinichi Kishimoto
    • Takehiko KataokaHaruo KawasakiHarutoshi OhuraYoshinobu UchidaAkihiko YasakiShinichi Kishimoto
    • B01D3/14B01D3/36C07B63/00C07C7/06C07C15/06C07C51/46C07C53/08C07K5/075
    • C07K5/0613B01D3/36C07C51/46
    • 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.
    • 本发明公开了一种将(α)-L-天冬氨酰基-L-苯丙氨酸甲酯制备期间获得的有机溶剂的混合溶液中的每种成分分离的方法,其可用作甜味剂即乙酸混合溶液 酸和甲苯或乙酸,甲苯和甲酸的混合溶液,以尽可能少的操作以高回收率回收每种组分。 该方法使过程合理化,在实际应用中非常有价值。 当从含有乙酸和甲苯作为主要组分的混合溶液中分离和回收各成分时,使用水作为共沸溶剂通过共沸蒸馏分离乙酸和甲苯,并且当将每种组分从含有 乙酸,甲苯和甲酸为主要成分,(a)蒸馏出混合溶液,从塔顶回收甲酸,从塔底回收乙酸和甲苯的混合溶液; 和(b)通过使用水作为共沸溶剂蒸馏从底部获得的混合溶液,并从塔顶回收甲苯,从塔底回收乙酸。