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软钾镁矾结晶热力学性质研究

发表时间:2013-04-15  浏览量:1325  下载量:327
全部作者: 袁俊生,王程程,韩荣敏,纪志永,郭小甫
作者单位: 河北工业大学海水资源高效利用化工技术教育部工程研究中心;河北工业大学化工学院
摘 要: 采用湿渣法测定软钾镁矾(K2SO4·MgSO4·6H2O)在不同配比的乙醇-水混合溶剂中的溶解度,并用电导率法测定其在水中的超溶解度数据,确定了软钾镁矾水溶液的结晶介稳区,并检测了温度、搅拌速率和降温速率对其介稳区的影响。研究表明:软钾镁矾在不同配比乙醇-水混合溶剂中的溶解度随混合溶剂中乙醇比例的增大而减小,当混合溶剂中乙醇与水的体积比为1∶1时,软钾镁矾的溶解度非常小,接近于0. 软钾镁矾的介稳区随搅拌速率的增大而变窄,随降温速率的增大而变宽,温度的升高使其介稳区变窄。这为软钾镁矾工业结晶装置的设计、工程放大和工业结晶生产操作提供了理论依据。
关 键 词: 化学工程基础学科;热力学;结晶;介稳区;软钾镁矾
Title: Study on crystallization thermodynamics properties of picromerite
Author: YUAN Junsheng, WANG Chengcheng, HAN Rongmin, JI Zhiyong, GUO Xiaofu
Organization: Engineering Research Center of Seawater Utilization Technology, Ministry of Education, Hebei University of Technology; School of Chemical Engineering and Technology, Hebei University of Technology
Abstract: In this paper, using wet slag method, the solubilities of picromerite in alcohol-water system with different proportion were determined. The supersolubility data of picromerite was also measured by means of conductivity method. Then, the crystallization metastable zone width of picromerite in water was obtained. At the same time, the influence of temperature, agitating rate and cooling rate on the metastable zone width was also studied. The results showed that the solubility of picromerite decreased with the increasing proportion of alcohol in the alcohol-water system. When the volume proportion of alcohol∶water was 1∶1, the solubility of picromerite nearly reached to zero. The metastable zone width of picromerite widened with the increase of cooling rate and the decrease of agitating rate, narrowed with the rising temperature. This study provided theoretical basis for the design of industrial crystallization device of picromerite, engineering expanding and industrial crystallization production.
Key words: basic subject of chemical engineering; thermodynamics; crystallization; metastable zone; picromerite
发表期数: 2013年4月第7期
引用格式: 袁俊生,王程程,韩荣敏,等. 软钾镁矾结晶热力学性质研究[J]. 中国科技论文在线精品论文,2013,6(7):679-683.
 
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