摘要
目的:针对氟代碳酸乙烯酯合成过程中产生的含氟废盐,采用沉淀-絮凝两段结合的方法对其中的氟离子进行沉淀处理,并对副产氯化钾进行回收。方法:通过考察沉淀剂、絮凝剂的种类和用量、pH等确定最优除氟工艺;对氯化钾结晶温度、洗涤水用量进行探究,确定了氯化钾的最佳回收条件。结果:选用CaCl_(2)与Ca(OH)_(2)为沉淀剂,当pH为8.0,n(Ca^(2+)):n(F^(-))为0.7时,采用单段除氟工艺,溶液氟离子浓度从153 mg/L降低至20.3 mg/L。结论:采用两段除氟工艺,使用絮凝剂硫酸铝,当n(Al^(3+)):n(F^(-))为12:1时,残余氟离子浓度从20.3 mg/L降低至3.0 mg/L,氯化钾纯度高达99.7%,符合国家工业废水的排放标准,整体工艺体现了绿色、经济的要求。
Objective:To precipitate the fluoride ions in the fluorine-containing waste salts generated during the synthesis of fluoroethylene carbonate by precipitation-flocculation method,and to recover the by-product potassium chloride.Methods:The optimal defluoridation process was determined by investigating the types,dosages and pH of precipitants,flocculants,etc.,and the optimal recovery conditions of potassium chloride were determined by exploring the crystallization temperature and washing water consumption of potassium chloride.Results:When CaCl_(2) and Ca(OH)_(2) were selected as precipitants,pH was 8.0 and n(Ca^(2+)):n(F^(-))was 0.7,the fluoride ion concentration in the solution was reduced from 153 mg/L to 20.3 mg/L by using the single-stage fluoride removal process.Conclusion:When n(Al^(3+)):n(F^(-))is 12:1,the residual fluoride ion concentration is reduced from 20.3 mg/L to 3.0 mg/L,and the purity of potassium chloride is as high as 99.7%,which meets the national discharge standards for industrial wastewater,and the overall process reflects the requirements of green and economic chemistry.
作者
高维丹
臧正文
许阿亮
吕绪涛
吴耀寰
岳涛
GAO Weidan;ZANG Zhengwen;XU Aliang;LYU Xutao;WU Yaohuan;YUE Tao(Shandong Research Institute of Chemical Industry,Qingdao University of Science and Technology,Jinan,Shandong 250014,China;Shandong Baichuan Jida Environmental Engineering Co.,Ltd.,Jinan,Shandong 250098,China)
出处
《浙江化工》
CAS
2024年第2期42-47,共6页
Zhejiang Chemical Industry
基金
泰山学者建设工程项目基金(ts20130918)。
关键词
氟代碳酸乙烯酯
含氟废盐
沉淀-絮凝
氯化钾
fluorovinyl carbonate
fluorine-containing waste salts
precipitation-flocculation
potassium chloride
作者简介
高维丹(1989—),男,工程师,主要从事精细化工学品绿色合成技术的开发及废盐的资源化利用工作。;通讯作者:岳涛,E-mail:yuetao0388@163.com。
