Study on effects of different organic compounds on solubility and metastable zone of sodium chloride

doi:10.16085/j.issn.1000-6613.2017-0153

Abstract

Abstract: In the process of zero discharge of wastewater,the existence of organic matter has an adverse effect on crystallization of inorganic salt. Therefore,it is necessary to study the effect of organic additives on salt crystallization. The solubility,supersolubility and variation of the metastable zone(MSZW) of sodium chloride in pure water and aqueous solution that added peptone,phenol and heptanediacid were measured in this paper. The results showed that the existence of the three organic matters decreases the solubility of sodium chloride. The solubility decreases with the increase of organic concentration. The effect of heptanediacid is the largest. All the organic additives doped in sodium chloride will narrow the MSZW,and the degrees of the organic additives are in the order as follows:phenol > heptanediacid > peptone. In the phenol aqueous solution with saturated temperature of 343.15K and COD of 20000mg/L,the width of MSZW can be reduced by 65.3% compared with that in pure water. The faster the stirring rate and the lower the cooling rate,the narrower the MSZW. In the presence of different organic matters,the order of the influence of stirring rate on the MSZW as follows:heptanediacid > peptone > phenol,the order of the influence of cooling rate on the MSZW as follows:peptone > phenol > heptanediacid.

Key words: solubility, crystallization, thermodynamics, nucleation, mestable zone, sodium chloride

摘要： 在实施废水零排放工程中，有机物的存在给无机盐结晶过程带来不利影响，因而有必要考察有机物添加剂对盐结晶的影响规律。本文测定了氯化钠在水以及添加蛋白胨、苯酚和庚二酸的水溶液中的溶解度和超溶解度，考察了介稳区的变化规律。结果表明，3种有机物均使氯化钠溶解度降低，且溶解度随有机物含量的增大而减小，其中庚二酸的影响最大。3种有机物的存在也同时降低了介稳区的宽度，且随有机物含量增大而减小，影响大小顺序为苯酚 > 庚二酸 > 蛋白胨。在饱和温度为343.15K、COD为20000mg/L的苯酚溶液中，氯化钠介稳区宽度较纯水中相比可减小65.3%，影响效果明显。介稳区随搅拌速率的增大、降温速率的减小而变窄。搅拌速率在不同有机物存在下对介稳区影响大小顺序为庚二酸 > 蛋白胨 > 苯酚，降温速率在不同有机物存在下对介稳区影响大小顺序为蛋白胨 > 苯酚 > 庚二酸。

关键词: 溶解性, 结晶, 热力学, 成核, 介稳区, 氯化钠

CLC Number:

TQ013.1

LU Shiyao, ZHAO Yingying, YUAN Junsheng. Study on effects of different organic compounds on solubility and metastable zone of sodium chloride[J]. Chemical Industry and Engineering Progress, 2017, 36(09): 3210-3216.

卢诗谣, 赵颖颖, 袁俊生. 不同有机物对氯化钠溶解度和介稳区的影响[J]. 化工进展, 2017, 36(09): 3210-3216.

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