申请人:Queen's University At Kingston
公开号:EP3653584A1
公开(公告)日:2020-05-20
A method and system for reversibly converting water between an initial ionic strength and an increased ionic strength, using a switchable additive, is described. The disclosed method and system can be used, for example, in distillation-free removal of water from solvents, solutes, or solutions. Following extraction of a solute from a medium by dissolving it in water, the solute can then be isolated from the aqueous solution or "salted-out" by converting the water to a solution having an increased ionic strength. The solute then separates from the increased ionic strength solution as a separate phase. Once the solute is, for example, decanted off, the increased ionic strength aqueous solution can be converted back to water having its original ionic strength and reused. Switching from lower to higher ionic strength is readily achieved using low energy methods such as bubbling with CO2, CS2 or COS. Switching from higher to lower ionic strength is readily achieved using low energy methods such as bubbling with air, heating, agitating, introducing a vacuum or partial vacuum, or any combination or thereof.
本文描述了一种利用可切换添加剂在初始离子强度和增加离子强度之间可逆转换水的方法和系统。所公开的方法和系统可用于免蒸馏去除溶剂、溶质或溶液中的水分。将溶质溶于水从介质中提取出来后,可通过将水转化为离子强度增加的溶液,将溶质从水溶液中分离或 "盐析 "出来。然后,溶质作为一个独立的相从离子强度增加的溶液中分离出来。例如,一旦溶质被倾析掉,离子强度增加的水溶液就可以转换回具有原始离子强度的水并重新使用。使用低能耗方法,如二氧化碳、CS2 或 COS 鼓泡,可以很容易地实现从较低离子强度到较高离子强度的转换。从较高的离子强度转换到较低的离子强度可通过低能耗的方法轻松实现,如用空气鼓泡、加热、搅拌、抽真空或部分抽真空,或它们的任意组合。