不同有机物对氯化钠溶解度和介稳区的影响
发布时间:2018-01-29 06:05
本文关键词: 溶解性 结晶 热力学 成核 介稳区 氯化钠 出处:《化工进展》2017年09期 论文类型:期刊论文
【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。
[Abstract]:In the project of zero discharge of wastewater, the existence of organic matter has a negative effect on the crystallization process of inorganic salt. Therefore, it is necessary to investigate the effect of organic additives on salt crystallization. The solubility and supersolubility of sodium chloride in water and aqueous solution with peptone, phenol and heptanic acid were determined. The results show that the solubility of sodium chloride decreases and the solubility decreases with the increase of organic matter content. The existence of 3 kinds of organics also decreased the width of the metastable zone and decreased with the increase of organic matter content. The order of influence is phenol heptate peptone in phenol solution with saturation temperature of 343.15kg / L COD = 200mg / L. Compared with pure water, the width of the metastable zone of sodium chloride can be reduced by 65.3, and the effect is obvious. The metastable zone increases with the agitation rate. The influence of stirring rate on the metastable region in the presence of different organic compounds was in the order of peptone phenol. The order of the influence of cooling rate on the metastable region in the presence of different organic compounds is peptone phenol heptanic acid.
【作者单位】: 河北工业大学海洋科学与工程学院;海水资源高效利用化工技术教育部工程研究中心;河北省现代海洋化工协同创新中心;泉州师范学院化工与材料学院;
【基金】:国家科技支撑计划(2015BAB09B00) 天津市自然科学基金(14JCYBJC20700) 河北省科技计划(16273602D) 福建省海洋高新产业发展专项项目(闽海洋高新[2015]13号) 泉州市科技技术(2015Z111)项目
【分类号】:TQ131.12;X703
【正文快照】: 随着我国工业规模的增大,工业用水量激增,废水排放量也迅速增大,废水中除含有大量可溶性无机盐,如Cl 、Na+、SO42 等,还含有许多难降解有机物[1],如酚[2]、二元酸[3]、表面活性剂[4]、多环芳烃、硝基芳烃化合物、腐植酸等。有些综合废水中可溶性盐含量高于100g/L,COD可达100,
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