Process to separate useful compounds, such as quinoline, indole, derived from coal using solvent extraction or liquid membrane method

采用溶剂萃取法和液膜法对煤焦油馏分中吸附油和焦油轻质油进行原料分离。在溶剂萃取法的研究中，实验测量了进料混合物（吸附油/焦油轻质油）与溶剂（甲醇水溶液）的液液平衡关系、萃取后萃取物中萃取剂与溶剂组分的分离、根据得到的实验结果计算逆流多级接触萃取等。结果表明，氮杂环类化合物比混合料中的其他化合物更容易被萃取。二次溶剂萃取和萃取后的精馏可分离出富含氮化合物的萃取剂，回收溶剂成分，这些进料可根据实际操作条件分离成产品等。在液膜法的研究中，实验测量了进料与膜液（水）、溶剂（几种碳氢化合物）与膜液的液液平衡，通过支撑液膜和乳液液膜进行了批量渗透。由于进料中氮化合物的分配系数与烃类溶剂的种类密切相关，因此可以预测，采用氮化合物分配系数较低的溶剂可以提高氮化合物的分离性能。通过支撑液膜和乳状液膜的渗透实验证实了这一预测。

Solvent extraction and liquid membrane methods were applied to the raw separation of adsorption oil and tar light oil as coal tar distillates.In the study of the solvent extraction method, experimental measurement of liquid-liquid equilibrium relationship between feed mixture (adsorption oil/tar light oil) and solvent (aqueous methanol solution), separation between extractant and solvent components in the extract after extraction, calculation of extraction with countercurrent multistage contact based on the obtained experimental results, and so on, were carried out. The results showed that nitrogen heterocyclic compounds could be extracted preferentially to the other compounds contained in the feed mixture. Extractant rich in nitrogen compounds could be separated by both extraction with secondary solvent and distillation from the extract after extraction to recover the solvent components, these feeds could be separated into the products wife practical operation conditions, and so forth.In the study of the liquid membrane method, experimental measurement of liquid-liquid equilibria between feed and membrane liquid (water) and between solvent (several kinds of hydrocarbon) and membrane liquid, batch permeation through supported and emulsion liquid membrane were conducted. Since the distribution coefficients of nitrogen compounds in feeds were strongly dependent on the kind of hydrocarbon solvent, it was predicted that the separation performance for nitrogen compounds could be improved by the use of the solvent in which the distribution coefficient of nitrogen compounds were low. This prediction was confirmed by the permeation experiments with supported and emulsion liquid membrane.