C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 69/63 (2006.01) B01D 15/00 (2006.01) C07B 57/00 (2006.01) C07C 17/38 (2006.01) C07C 19/00 (2006.01) C07C 45/90 (2006.01) C07C 49/16 (2006.01) C07C 49/457 (2006.01) C07C 67/48 (2006.01) C07C 69/34 (2006.01) C07D 301/32 (2006.01) C07D 303/08 (2006.01) C07D 305/12 (2006.01) C07D 307/04 (2006.01) C07D 307/33 (2006.01)
Patent
CA 2276901
The object of the present invent:ion is to provide a method for efficiently resolving optical isomers. The object of the present invention can be achieved by a method for resolving optical isomers, in which an discriminating liquid consisting of an discriminating agent capable of discriminating optical isomers and a diluent is brought into contact with a mixture containing said optical isomers in counter current, to resolve the optical isomers by adsorption separation, distillation separation, absorption separation or membrane separation, and is recovered at an optical isomer content of 5 wt% or less for recycled use, characterized by satisfying one or move of the following conditions (a) The dielectric constant of the diluent is 30 or less and the viscosity of the discriminating liquid is 0.2 Pa's or less at the temperature of the resolving operation. (b) The discriminating agent contained has an effect of splitting the 1H or 13C-NMR spectrum peak of the optical isomers when added and the diluent contained has a dielectric constant equal to or lower than the dielectric constant of the measuring solvent at the time of measuring the 1H or 13C-NMR spectrum. (c) The boiling point of at least one compound of the discriminating agent at the pressure of resolving operation is higher than the boiling point of at least one compound of the diluent at the pressure of resolving operation. (d) The boiling point of at least one compound of the diluent at the pressure of resolving operation is higher than the boiling point of the optical isomers to be resolved, at the pressure of resolving operation by 10°C or more. (e) The concentration of,the discriminating agent in the discriminating liquid is 10 wt% or more.
Aoki Tomoyuki
Kanai Takashi
Kitagawa Tetsuji
Okamoto Atsushi
Shibayama Katsuhiro
Smart & Biggar
Toray Industries Inc.
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