间苯二磺酸钠与硫酸钠的分离研究
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摘要
分离过程在化工生产中具有重要地位。本论文采用化学沉淀法和络合萃取法分别对某化工厂提供的间苯二磺酸和硫酸的混合物进行了分离研究。
     采用化学沉淀法分离间苯二磺酸中的硫酸,实验结果表明,选择Ca(OH)_2作为沉淀分离剂,在适宜条件下,硫酸的去除率达94.71%,产物CaSO_4中间苯二磺酸钠的含量为2.64%,母液经脱水后,Na_2SO_4的含量为1.23%。探讨了物料配比、溶液pH值、反应时间、反应温度、洗水体积、水洗温度等条件对分离效果的影响,并优化了分离操作条件。
     同时,本论文还对采用络合萃取法分离间苯二磺酸中的硫酸进行了研究。选择三辛胺为络合剂、正辛醇为稀释剂,研究了络合剂浓度、萃取剂体积、溶液酸度、萃取温度、静置分层时间等条件对萃取效果的影响;同时也研究了反萃取剂用量、反萃温度、静置时间等条件对反萃取效果的影响,并进行了操作条件的优化。实验结果表明,在适宜操作条件下,间苯二磺酸的萃取率达到99.13%;萃余水相经脱水后,间苯二磺酸钠的含量为2.59%;反萃水相经脱水后,Na_2SO_4的含量为3.48%。萃取剂可循环使用。
Separation process has an important position in chemical industry. The experiments for separating the mixture of Benzene-1, 3-disulfonin acid and sulfuric acid from a chemical plant were studied by using the methods of chemical precipitation and complex extraction.
    The experiment for separating sulfuric acid from the Benzene-1, 3-disulfonin acid was studied by using the method of chemical precipitation. The results show that, by selecting Ca(OH)_2 as the precipitation separation reagent, the removal rate of sulfuric acid is 94.71%, the content of Benzene-1,3-disulfonin acid in the by-product of CaSO_4 is 2.64%, the content of Na_2SO_4 is 1.23% in the solid which is obtained by dehydrating the mother solution under the appropriate conditions. Different effects on the separation were discussed in details, such as raw material ratio, pH value of solution, reaction time, reaction temperature, volume of washing water and washing water temperature. Moreover, the conditions of the separation were optimized.
    Furthermore, the experiment for separating sulfuric acid from Benzene-1, 3-disulfonin acid was also studied by using the method of complex extraction. Selecting trioctylamine as the complex agent and using n-Octanol as the diluent, this article studied different effects on the extraction, such as concentration of complex agent, volume of extractant, acidity of solution, extraction temperature and resting time. Moreover, this article also studied different effects on the back-extraction, such as the volume of back-extractant, back-extraction temperature and resting time, and optimized the conditions of the separation. The results show that the extraction ratio of Benzene-1,3-disulfonin acid is 99.13%, the content of Benzene-1,3-disulfonin acid soldium salt is 2.64% in the solid which is obtained by dehydrating the raffinate phase; the content of Na_2SO_4 is 3.48% in the solid which is obtained by dehydrating the stripping aqueous phase. The extractant can be reused.
引文
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