低温煤焦油中正十二烷-甲苯-苯酚的相平衡及分离

张海永1 刘潜1 刘兴坤1 张香兰1 解强1 王永刚1

(1.中国矿业大学 (北京) 化学与环境工程学院, 北京 100083)

【摘要】低温煤焦油组分的分离对其充分利用具有重要的作用。分别以正十二烷、甲苯和苯酚为模型化合物, 采用实验和Aspen Plus模拟两种方法得到了低温煤焦油中脂肪烃-芳烃-酚类三元体系的液液平衡关系, 并模拟了N, N-二甲基甲酰胺 (DMF) 水溶液萃取分离该体系时的典型三元相图。结果表明, Aspen Plus采用UNIF-LL法模拟得到的三元相图与实验测定结果吻合较好。甲苯在正十二烷-甲苯-苯酚体系中作为共溶溶剂, 促使三元体系成为均相。根据正十二烷、甲苯和苯酚在DMF中的溶解性差异, 结合Hansen溶度参数理论, 通过在DMF中添加不同含量的H2O以调节萃取剂的极性, 可使正十二烷和甲苯依次从均相体系中分离。通过对萃取温度、剂油比和萃取剂含水量进行优化, 最终在303.15 K, 剂油比为1.5时, 以DMF对模型油进行单级萃取, 可以得到纯度为93.2%的正十二烷;相分离后向萃取相中添加DMF量30%的H2O, 可分离出纯度为93.4%的甲苯。

【关键词】 低温煤焦油; 液-液相平衡; Aspen Plus; 模拟; 溶剂萃取; 分离;

【DOI】

【基金资助】 国家重点研发计划项目 (2016YFB0600305) 国家重点研发计划项目 (2016YFB0600305) 国家自然科学基金项目 (21506251) 国家自然科学基金项目 (21506251)

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This Article

ISSN:0438-1157

CN: 11-1946/TQ

Vol 69, No. 08, Pages 3479-3487+3293

August 2018

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摘要

  • 引言
  • 1 实验材料和方法
  • 2 实验结果与讨论
  • 3 结论
  • 符号说明
  • 参考文献