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    • 7. 发明申请
    • ACETIC ACID EXTRACTION FROM AQUEOUS STREAMS
    • 乙酸从水流中提取
    • WO2017114816A1
    • 2017-07-06
    • PCT/EP2016/082688
    • 2016-12-27
    • SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ B.V.SHELL OIL COMPANY
    • FISCHER, Kai, JürgenLANGE, Jean Paul, Andre, Marie, Joseph, GhislainPEREZ GOLF, Carmelo
    • C07C51/48C07C53/08
    • C07C51/48C07C53/08
    • The invention provides process for the recovery of acetic acid from an aqueous stream, comprising providing an aqueous stream comprising acetic acid, contacting said aqueous stream comprising acetic acid with an extractive solvent in a liquid-liquid extraction unit, to produce a first stream comprising extractive solvent and acetic acid and a second stream comprising water, feeding said first stream comprising extractive solvent and acetic acid to a solvent recovery unit, to produce a third stream comprising acetic acid and a fourth stream comprising extractive solvent, and optionally recycling at least a portion of the fourth stream comprising extractive solvent to the liquid- liquid extraction unit, wherein the extractive solvent is an oxygen-containing organic compound having (i) a Hansen solubility parameter distance Ra with respect to acetic acid as determined at 25 °C of 15 MPa 1/2 or less, preferably 12 MPa 1/2 or less, more preferably 10 MPa 1/2 or less; (ii) a 1-octanol/water partition coefficient logP 0w as determined at 25 °C and pH 7 of at least 0, preferably at least 0.5, more preferably at least 1.0, even more preferably at least 1.5, yet even more preferably at least 2.0, most preferably at least 3.0; and (iii) a boiling point at atmospheric pressure that is at least 5 °C higher, preferably at least 10 °C higher, more preferably at least 20 °C higher than the boiling point of acetic acid.
    • 本发明提供了从含水物流中回收乙酸的方法,包括提供含乙酸的含水物流,使所述含乙酸的含水物流与萃取溶剂在液 - 液萃取装置中接触 产生包含萃取溶剂和乙酸的第一物流和包含水的第二物流,将包含萃取溶剂和乙酸的所述第一物流进料至溶剂回收单元,以产生包含乙酸的第三物流和包含萃取溶剂的第四物流 并且任选地将包含萃取溶剂的第四物流的至少一部分再循环至液 - 液萃取单元,其中萃取溶剂是含氧有机化合物,其具有(i)相对于乙酸的Hansen溶解度参数距离Ra, 在25℃测定为15MPa 1/2或更小,优选12MPa 1/2或更小,更优选10MP 一个 1/2 或更少; (ii)如在25℃和pH7下测定的至少0,优选至少0.5,更优选至少1.0,甚至更优选在25℃下测定的1-辛醇/水分配系数logP 0w 至少1.5,甚至更优选至少2.0,最优选至少3.0; 和(iii)在大气压下的沸点比乙酸的沸点高至少5℃,优选高至少10℃,更优选高至少20℃。