293K下K^+/CO_3^(2-),HCO_3^-、Cl^-、H_2O四元体系相图的研究——从农药废水中回收无机盐  

Phase Diagram of K^+/CO_3^(2-) ,HCO_3^-,Cl^-,H_2O Four Components System——Recovering Salts from Waste Liquor in Imidacloprid Production

作　　者：周守勇[1] 彭盘英[2] 崔世海[2] 王玉萍[2] 

机构地区：[1]淮阴师范学院化学系,淮安223001 [2]南京师范大学化学与环境科学学院,南京210097

出　　处：《化工进展》2005年第7期796-799,共4页Chemical Industry and Engineering Progress

摘　　要：用等温法测定了293K下K+/CO32-、HCO3-、Cl-、H2O四元体系的溶解度,根据溶解度数据绘制了相图,相图由KCl、KHCO3、K2CO3·3/2H2O、K2CO3·2KHCO3·3/2H2O四个相区组成。实验结果表明,K2CO3对KCl和KHCO3有强烈的盐析作用。以四元水盐体系相图理论作指导,对吡虫啉农药生产废水进行等温蒸发,分析计算了废水中各种盐的析出顺序及析出量,给出了分离氯化钾和碳酸钾较为理想的蒸发终止点,并提出了合理的工艺流程。The equilibrium solubility of the K^＋／CO3^2-，HCO3^-、Cl^-、H2O quaternary system at 293 K was determined with the isothermal method. Based on the solubility data, the phase diagram of the system was plotted, which consisted of four crystallization zones： KCl, KHCO3,K2CO3· 3/2H2O, and K2CO3 · 2KHCO3 · 3/2H2O. K2CO3 had strong salting- out effect no KCl and KHCO3 in the solution. According to the theory of the phase diagrams of the quaternary water and salt system, the sequence and the quantities of various salts which salted out from the solution were obtained, and the evaporation end point to separate out K2CO3 and KCl was determined. A feasible process was proposed.

关 键 词：吡虫啉废水 蒸发 四元水盐体系相图 相图分析 

分 类 号：TQ450.9[化学工程—农药化工]