Experiments and insights of desalination by a freezing/thawing method at low subcooling

作     者：Jun Chen Jianjian Wu Jiafeng Xu Qing Yuan Bin Deng Changzhong Chen Zhi Li Jun Chen;Jianjian Wu;Jiafeng Xu;Qing Yuan;Bin Deng;Changzhong Chen;Zhi Li

作者机构：Hunan Provincial Key Laboratory of Xiangnan Rare-PreciousMetals Compounds and ApplicationsCollege of Chemistry&Biology and Environmental EngineeringXiangnanUniversityChenzhou 423000China Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of EducationDalian University of TechnologyDalian 116024China School of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252059China Shandong Provincial Key Laboratory of Molecular EngineeringQiLu University of Technology(Shandong Academy of Sciences)Jinan 250353China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2020年第28卷第12期

页      面：3011-3017页

核心收录：

学科分类：0710[理学-生物学] 080706[工学-化工过程机械] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0703[理学-化学] 0824[工学-船舶与海洋工程] 

基　　金：supported by the National Natural Science Foundation of China(21908116) the Hunan Provincial Natural Science Foundation of China(2019JJ50567) the projects of the Education Department of Hunan Province(17A199) the Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education(LOEC-201809) Scientific Research Foundation of Xiangnan University for High-Level Talents Development and application of nonferrous metal functional materials team 

主　　题：Desalination Ice Aqueous solution Separation Removal efficiency Mechanism 

摘      要：Desalination by freezing/thawing method was a very important method to obtain fresh water from *** this work,desalination by freezing/thawing method was conducted with initial sodium chloride of 3.5 wt% in consideration of stirring speed,freezing time and *** subcooling ranged from 1.2 K to 4 *** optimum conditions for desalination in this work were stirring speed of 200 r·min^−1,freezing time of 120 min,and subcooling of 3 *** results also showed that sodiumchloride cannot be effectively removed by once freezing/thawing *** maximumremoval efficiency of sodiumchloride was 64.3%.Two major reasons resulting in the impurity of obtained melted water by freezing/thawing method were *** first reason was the inevitable adhesion of salt solution to the surface of ice,which could be removed easily by distilled water *** second reason was that salt solution was heterogeneously wrapped in the accumulated ice,which was difficult to be removed by distilled water *** liquid flushing method was proposed to verify the conjecture,and the results were in accordance with the two reasons mentioned *** method,such as multiple flushing liquid method,was suggested to be used during the freezing/thawing process for effectively removing sodium chloride,and obtaining fresh water.