Composite extractant of liquid-liquid extraction aromatics for the coal-derived naphtha

doi:10.16085/j.issn.1000-6613.2016-1971

Abstract

Abstract: The purpose of the study was to research the effects of various extractants on the solubility and the selectivity of aromatics from coal-derived naphtha. Using liquid-liquid extraction technology,the composite extractants were obtained for removing aromatics of the low aromatic naphtha. Firstly,considering the selective coefficient(S) and the partition coefficient(K) of C₆,C₇,C₈ aromatics in the coal-derived naphtha system with the five extractants,the main extractant dimethyl suifoxide(DMSO)was optimized. Secendly,the LLE data of the composite extractants and the low aromatic simulate oil prepared by the methyl cyclohexane and toluene systems were measured based on the main extractant DMSO supplemented with DMF,sulfolane,NFM or TEG. The experimental data were correlated by the hand correlation,and the auxiliary extractant DMF was proved to be more appropriate. Finally,the aromatic removal rate and the yield of solvent oil were served as indexes. The study explored the effects of composite extractant DMSO+DMF on removal of aromatics from coal-derived naphtha. The results showed that after five stages counter-current extraction under the optimized process conditions,the composite extractant DMSO+10%DMF had good effects on the removal of aromatics from coal-derived naphtha. The distribution coefficient of the aromatics from coal-derived naphtha was up to 0.215 and the maximum selectivity coefficient was 9.96. The total aromatic content decreased from 12.36% to 1.30%,reaching the standard of aromatic content in 120 solvent oil.

Key words: coal-derived naphtha, liquid-liquid extraction, phase equilibrium, composite extractant, solvent oil

摘要： 采用液液抽提方法研究不同萃取剂对煤基石脑油中芳烃溶解性和选择性的影响，得到了适用于低芳石脑油芳烃脱除的复合萃取剂。本文首先研究了煤基石脑油C₆、C₇、C₈芳烃在5种萃取剂中的分配系数和选择性系数，优选出二甲基亚砜（DMSO）作为主萃取剂。其次，以甲基环己烷和甲苯为低芳模拟油，以DMSO为主萃取剂，DMF、环丁砜、NFM及TEG为辅萃取剂，研究其液液相平衡规律，并用Hand方程对实验数据关联，确定出DMF为适合的辅助溶剂。最后，以芳烃脱除率和脱芳油收率为指标，探究了复合萃取剂DMSO+DMF对煤基石脑油芳烃脱除的影响。研究结果表明：在优化工艺条件下，经5级错流萃取，复合萃取剂DMSO+10%（体积分数）DMF对煤基石脑油具有较好的脱芳效果，其芳烃的分配系数最高达0.215，选择性系数最大为9.96，总芳烃质量分数由原来的12.36%降低到了1.30%，达到120^#溶剂油中芳烃含量的标准。

关键词: 煤基石脑油, 液液萃取, 相平衡, 复合萃取剂, 溶剂油

CLC Number:

TE624.5

XUE Fengfeng, LI Dong, ZHANG Linna, ZHU Yonghong, FENG Xian, PEI Liangjun, LI Wenhong. Composite extractant of liquid-liquid extraction aromatics for the coal-derived naphtha[J]. Chemical Industry and Engineering Progress, 2017, 36(08): 2897-2902.

薛凤凤, 李冬, 张琳娜, 朱永红, 冯弦, 裴亮军, 李稳宏. 煤基石脑油萃取脱芳复合萃取剂[J]. 化工进展, 2017, 36(08): 2897-2902.

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