铵明矾在氯化钠溶液中结晶介稳区和诱导期的测定  

Determination of metastable zone width and induction period of ammonium alum in sodium chloride solution

作　　者：黄泽恩[1] 石文媛 王车礼[1,2] HUANG Ze-en;SHI Wen-yuan;WANG Che-li(School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China;School of Pharmaceutical Engineering&Life Science,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学石油化工学院,江苏常州213164 [2]常州大学制药与生命科学学院,江苏常州213164

出　　处：《现代化工》2020年第8期221-226,共6页Modern Chemical Industry

基　　金：国家自然科学基金项目(51301028);江苏省科技厅省工程技术研究中心项目(BM2012416)。

摘　　要：在293.15~323.15 K温度范围内,采用激光法测定了铵明矾在氯化钠溶液中的介稳区宽度和诱导期,分别研究了不同饱和温度、搅拌速率和降温速率对铵明矾介稳区的影响以及各温度下过饱和度对铵明矾诱导期的影响。结果显示,铵明矾在氯化钠溶液中的结晶介稳区均随着搅拌速率和饱和温度的增大而变窄,随着降温速率的升高而变宽;根据Sangwal的3D成核理论方程推算出铵明矾在氯化钠溶液中的成核活化能;此外实验测定铵明矾的诱导期随着过饱和度和饱和温度的增大而缩短,根据诱导期实验数据和经典成核理论,计算出293.15~303.15 K温度范围内铵明矾在氯化钠溶液中的界面张力。The crystallization metastable zone width and induction period of ammonium alum in sodium chloride solution are measured by laser method at the temperature range from 293.15-323.15 K.The influences of saturation temperature,agitation speed and cooling speed on the metastable zone width are studied,and the effect of supersaturation on the induction period is also explored.Study results show that the crystallization metastable zone width of ammonium alum in sodium chloride solution becomes narrow with rising saturation temperature and agitation speed,but widens with the rising cooling speed.According to Sangwal’s 3 D nucleation theoretical equations,the nucleation activation energy of ammonium alum in sodium chloride solution is calculated out.Furthermore,the experimentally measured induction period decreases with the increasing supersaturation and saturation temperature.Solid-liquid interfacial tension of ammonium alum in sodium chloride in the temperature range of 293.15-323.15 K are obtained through calculation on the basis of classical nucleation theory and induction period experimental data.

关 键 词：铵明矾 溶解度 介稳区宽度 诱导期 

分 类 号：X781.4[环境科学与工程—环境工程]