Method for separating alcohol-salt mixture by supercritical carbon dioxide extraction

• Main Authors: LYU BING, CHEN HAIBO, ZHANG XIN
• Format: Patent
• Language: Chinese; English
• Published: 25.07.2017
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; ORGANIC CHEMISTRY; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention provides a method for separating an alcohol-salt mixture by supercritical carbon dioxide extraction. The method comprises a) feeding supercritical carbon dioxide into an extraction tank, extracting polyol in an alcohol-salt mixture and transferring the polyol into a primary separation tank, b) reducing the temperature and pressure in the primary separation tank, keeping a carbon dioxide supercritical state, separating the extracted polyol from carbon dioxide and feeding the supercritical carbon dioxide containing a small amount of polyol into a secondary separation tank, and c) pre-adding a defoamer into the secondary separation tank, reducing pressure so that the supercritical state of the carbon dioxide is changed into a common gaseous state and further separating polyol so that polyol in the alcohol-salt mixture can be completely separated. 本发明提供了超临界二氧化碳萃取分离醇盐混合物的方法：a)在萃取罐中通入超临界二氧化碳，对醇盐混合物中的多元醇进行萃取后转入级分离罐；b)级分离罐中降低温度和压力仍保持二氧化碳的超临界状态,被萃取出来的多元醇从二氧化碳中分离，溶有少量多元醇的超临界二氧化碳被送入二级分离罐；c)二级分离罐中预先加入消泡剂，降压