本文關鍵詞： 溶解性 結晶 熱力學 成核 介穩(wěn)區(qū) 氯化鈉　出處：《化工進展》2017年09期 　論文類型：期刊論文

【摘要】：在實施廢水零排放工程中,有機物的存在給無機鹽結晶過程帶來不利影響,因而有必要考察有機物添加劑對鹽結晶的影響規(guī)律。本文測定了氯化鈉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,考察了介穩(wěn)區(qū)的變化規(guī)律。結果表明,3種有機物均使氯化鈉溶解度降低,且溶解度隨有機物含量的增大而減小,其中庚二酸的影響最大。3種有機物的存在也同時降低了介穩(wěn)區(qū)的寬度,且隨有機物含量增大而減小,影響大小順序為苯酚庚二酸蛋白胨。在飽和溫度為343.15K、COD為20000mg/L的苯酚溶液中,氯化鈉介穩(wěn)區(qū)寬度較純水中相比可減小65.3%,影響效果明顯。介穩(wěn)區(qū)隨攪拌速率的增大、降溫速率的減小而變窄。攪拌速率在不同有機物存在下對介穩(wěn)區(qū)影響大小順序為庚二酸蛋白胨苯酚,降溫速率在不同有機物存在下對介穩(wěn)區(qū)影響大小順序為蛋白胨苯酚庚二酸。
[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.
【作者單位】： 河北工業(yè)大學海洋科學與工程學院;海水資源高效利用化工技術教育部工程研究中心;河北省現(xiàn)代海洋化工協(xié)同創(chuàng)新中心;泉州師范學院化工與材料學院;
【基金】：國家科技支撐計劃(2015BAB09B00) 天津市自然科學基金(14JCYBJC20700) 河北省科技計劃(16273602D) 福建省海洋高新產業(yè)發(fā)展專項項目(閩海洋高新[2015]13號) 泉州市科技技術(2015Z111)項目
【分類號】：TQ131.12;X703
【正文快照】： 隨著我國工業(yè)規(guī)模的增大,工業(yè)用水量激增,廢水排放量也迅速增大,廢水中除含有大量可溶性無機鹽,如Cl 、Na+、SO42 等,還含有許多難降解有機物[1],如酚[2]、二元酸[3]、表面活性劑[4]、多環(huán)芳烴、硝基芳烴化合物、腐植酸等。有些綜合廢水中可溶性鹽含量高于100g/L,COD可達100，

本文編號：1472733