第43卷第7期
应用化工
Vol 43 No. 7
2014年7月
Applied Chemical Industry
Jul.2014
不同质量分数乙醇、
乙酸钠溶液对双乙酸钠
结晶过程影响
王玉雪2,谢放华2,李妲丽,陈春燕,昌宪伟,陈掌',宁文博
(1.湘潭大学化工学院,湖南湘潭411052.湘潭大学绿色催化与反应工程湖南省高校重点实验室,湖南湘潭4]1105)
摘要:为提高双乙酸钠SDA)的产品质量,考察了温度、溶剂组成、乙酸钠含量等条件对SDA溶解性的影响,采用
动态法测定了SDA在不同质量分数乙醇水、乙酸钠-水混合溶剂中的溶解度,并测定了SDA在纯水和质量分数为
0.7996(o1=0.7996)的乙醇溶液中的介稳区。结果表明,SDA易溶于水,微溶于乙醇,随乙醇质量分数增加,SDA
溶解度降低愈加显著,目在01=0.7996的乙醇溶液中降低最为明显;随产物中乙酸钠含量增加,SDA溶解度逐渐
减小,且在质量分数为0.0832乙酸钠溶液中降低幅度最大;在300~315K范围内,01=0.7996的乙醇溶液对
SDA和乙酸钠有明显的分离效果;SDA的介稳区宽度在纯水中随温度升高逐渐变窄,而在01=0.7996的乙醇溶液
中受温度影响变化小,且介稳区宽度较纯水中窄。因此,在SDA结晶中,可采用01=0.7996的乙醇溶液结晶分离
SDA,且过饱和浓度需控制在介稳区内。
关键词;双乙酸钠;结晶;溶解度;介稳区;改进 Jouyban- Acree 1模型
中图分类号:TQ026.5:TYQ420.6;0645.12:1TS202.3文献标识码:A文章编号:1671-3206(2014)07-1276-06
Study on the crystallization property of sodium diacetate in different
mass fractions of ethanol and sodium acetate solutions
WANG Yu-xue", X/E Fang-hua", L Da-li, CHEW Chun-yan, LU Xian-wei
CHEN Zhang, MNG Wen-bo
(1. School of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
2. The Green Catalytic and Reaction Engineering of Hunan Province Colleges and Universities Key Laboratory
Xiangtan University, Xiangtan 41 1105, China
Abstract: In order to improve the quality of SDA, the effect of temperature, solvent composition and Naac
content on the solubility of SDA in water were explored, the solubilities of SDA in ethanol and Naac solu-
tions were determined by dynamic method. In addition, the metastable zone of SDA in water and ethanol
solution( w, =0. 799 6)were obtained. The results showed that SDA was soluble in water, while slightl
soluble in ethanol and with the increase of ethanol in solvent mixtures. the solubilities decreased obyious
ly, especially the mass fraction of ethanol was 0. 799 6. Also, the solubilities of SDA decreased with the in
crease of Naac in solvent mixtures, especially the mass fraction of Naac was 0.083 2. What's more, etha
nol solution(w=0.799 6 )had played an active role for the separation of SDA and sodium acetate in the
range of 300 315 K. The metastable zone of SDA in water gradually narrowed with the increase of tem-
perature, while in ethanol solution(w, =0.799 6 )was little influenced by temperature changes and was
narrower. Therefore, thanol solution( w =0.799 6 )can be used as mixed solvent for crystallization and
separation of SDA, and the supersaturated concentration should be controlled in the metastable zone
Key words: sodium diacetate; crystallization; solubility; metastable zone; the modified Jouyban-acree
收稿日期:2014-04-02修改稿日期:20140420
基金项目:湖南省高等学校重点实验室开放课题(20091002
作者简介:王玉雪(1989-),女,辽宁朝阳人,湘潭大学在读硕士研究生,师从谢放华副教授,主要从事精细化工与过程工
程研究。电话:15898516129,E-mail:wangyuxuel009@126.com
通讯联系人:谢放华(1962-),男,湖南桃江人,湘潭大学副教授,硕士研究生导师,主要从事精细化工与过程工程研究。
E13875257108,E-mail:xiefanghua0@163.com