文献类型：期刊文献

中文题名：电解电渗析法制备硅溶胶

英文题名：PREPARATION OF SILICA SOLS BY ELECTRODIALYSIS

作者：刘红梅[1];衣宝廉[2]

第一作者：刘红梅

通讯作者：Liu, Hongmei

机构：[1]北京联合大学化学工程学院;[2]中国科学院大连化学物理研究所

第一机构：北京联合大学生物化学工程学院

通讯机构：[1]Academia Sinica, Dalian, China

年份：1996

卷号：47

期号：3

起止页码：340-345

中文期刊名：化工学报

外文期刊名：Journal of Chemical Industry and Engineering(China)

收录：CSTPCD;;EI(收录号：1996513373731);Scopus(收录号：2-s2.0-0030174689);北大核心:【北大核心1992】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：电解电渗析;阳离子交换膜;硅溶胶;制备

外文关键词：electrodialysis,cation-exchange membrane,silica silica sols,addition process

摘要：以RuO_x／Ti为阳极、铁镀镍为阴极与Nafion901阳离子交换膜组装成两室的电解电渗析槽，探讨了电解电渗析法制备硅溶胶过程中槽电压和pH值变化的基本规律，证实了增大电流密度和阳极液的进料液流速率可减少二氧化硅在阳极上的吸附沉积，增大二氧化硅的收率．在滴加操作中，通过实验找到了制备浓硅溶胶的较佳的初始组成和操作条件，基本上解决了二氧化硅在阳极上的沉积问题，最高槽电压不超过10V，最高电流密度可达150mA·cm^(-2)，膜的平均电流效率在93％左右．
An electrodialytic cell system equipped with a steel cathode,a RuOx/Ti anode and a piece of Nafion 901 cation-exchange membrane was set up in the process of producing silica sols by eletrodialysis of sodium silicate.It was confirmed that the deposition of silica on anodes can be minimized by increasing current density and the velocity of anolyte.The yield of silica was above 97% in the case of i＞50mA·cm^(-2), u＞0.3lm·s^(-1).The current efficiency of membrane was more than 90% when temperature was higher than 20℃ and current density was greater than 30mA·cm^(-2).Concentrated silica sols can be produced by electrodialysis in the process of adding concentrated sodium silicate (Xsio2=30%) into anolyte.The Optimal initial anolyte composition and operating conditions were obtained.The deposition of silica on anodes during the process can be overcome mainly if initial anolyte was dilute aqueous silica sols with particle size less than 5nm.The highest cell voltage was less than 10V,the greatest current density was about 150mA·cm^(-2) and the mean efficiency of membrane was about 93%.