超临界二氧化碳多年来一直用于从食料中萃取化学品 ,从水溶液中萃取微酸和醇 ,但迄今尚无人利用其通过酸 碱相互作用萃取微碱的能力。但是 ,芬兰ＶＴＴ化学技术公司的一个研究组的研究表明 ,40℃压力为 1 0ＭＰａ的ＣＯ2 从水性反应混合物中萃取吡啶的能力与二甲苯相当。在这 Supercritical carbon dioxide has been used for many years to extract chemicals from foodstuffs and to extract slightly acidic and alcoholic acids from aqueous solutions, but so far no one has exploited their ability to extract caustic soda through acid-base interactions. However, a study by a VTT Group research group in Finland showed that the CO2 extraction pressure of 10 MPa at 40 ° C is comparable to that of xylene in extracting pyridine from an aqueous reaction mixture. At this