Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1990-08-27
1992-08-11
Chan, Nicky
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
585800, 210634, 210741, 210742, 210773, 210774, 210808, 554175, 554205, 554184, 554189, 554190, 554210, C07D31172
Patent
active
051380757
ABSTRACT:
The present invention provides an extractive separation method in which a solute contained in a medium can be efficiently extracted and separated with a lower consumption of energy under the remarkably gentle operating conditions. This method consists in that a medium containing a solute consisting of organic substances is brought into contact with a solvent consisting of organic substances or inorganic substances, which have the critical temperature of 5.degree. to 152.degree. C. and are gaseous at an atmospheric temperature and an atmospheric pressure, to extract the solute from the medium and then the solute is separated from a mixture of extracts, said solute and said solvent being selected from a group consisting of the combinations forming a mixture system having an additional gas-liquid coexistence region, the extraction being carried out by bringing said medium into contact with said solvent in the sub-critical phase of said solvent, and the subsequent separation being carried out by heating said mixture of extracts to temperatures higher than the critical temperature of said solvent and higher the contact temperature by 5.degree. to 30.degree. C. This method is suitably applicable in particular to the separation of tocopherol from tocopherol-containing vegetable fats and oils with carbon dioxide as the solvent.
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Katayama Takashi
Ohgaki Kazunari
Chan Nicky
Kuraray Co. Ltd.
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