反应结晶制备工业级磷酸二氢钾过程的粒度控制

发布时间：2018-04-09 00:40

本文选题：磷酸二氢钾　切入点：反应结晶　出处：《化工进展》2017年10期

【摘要】：以工业级磷酸一铵为原料与氢氧化钾复分解反应结晶制备磷酸二氢钾是一种成本低廉、极具发展前景的方法,实验确定了采用该法制备的磷酸二氢钾产品粒度主要受反应阶段控制,继而研究分析了反应时间、搅拌速度、原料浓度和加入速率对磷酸二氢钾产品粒度分布的影响,探讨了磷酸二氢钾反应结晶机理,筛选出较优的反应结晶工艺。在控制磷酸一铵和氢氧化钾质量分数为50%,氢氧化钾溶液在30min内加入完毕,反应结晶时间为3h,搅拌速率为300r/min的条件下,获得的磷酸二氢钾产品中位粒径为1070μm,分布均匀,晶体形貌为规则的四方晶。
[Abstract]:The preparation of potassium dihydrogen phosphate from industrial grade monoammonium phosphate by double decomposition and crystallization of potassium hydroxide is a low-cost and promising method.It was determined that the particle size of potassium dihydrogen phosphate prepared by this method was mainly controlled by the reaction stage, and then the effects of reaction time, stirring speed, concentration of raw material and adding rate on the particle size distribution of potassium dihydrogen phosphate were studied.The reaction crystallization mechanism of potassium dihydrogen phosphate was discussed and the optimum reaction crystallization process was screened out.Under the conditions of controlling the mass fraction of monoammonium phosphate and potassium hydroxide as 50, the potassium hydroxide solution was added in 30min, the reaction crystallization time was 3 h, and the stirring rate was 300r/min, the median diameter of potassium dihydrogen phosphate product was 1070 渭 m and the distribution was uniform.The crystal morphology is regular tetragonal crystal.
【作者单位】：武汉工程大学化工与制药学院绿色化工过程省部共建教育部重点实验室湖北省新型反应器与绿色化学工艺重点实验室;湖北祥云(集团)化工股份有限公司;
【基金】：湖北省科技支撑计划(2015BCB248) 湖北省重大科技创新计划(2016ACA179)项目
【分类号】：TQ131.13

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