煤基石脑油萃取脱芳制备溶剂油工艺研究

Study on the Liquid-liquid Extraction Aromatic Process for The Coal-derived Naphtha to Produce Solvent Oil

摘要:

以中低温煤焦油加氢生成的石脑油（煤基石脑油）为原料，在萃取温度40 ℃、萃取剂和原料（剂油）体积比1.5:1、萃取时间5 min、分相时间20 min的工艺条件下，探究不同萃取剂对液-液萃取脱芳效果的影响，其中复合萃取剂V(二甲基亚砜):V(N,N-二甲基甲酰胺)=9:1(V(DMSO):V(DMF)=9:1)时脱芳效果较好，然后选择此萃取剂研究各工艺过程参数对脱芳效果的影响。通过单因素考察和响应面分析得到液-液萃取脱芳的最优工艺条件为：萃取温度为44.48 ℃，剂油比为1.69:1，萃取时间为5.30 min，分相时间为10 min，在此工艺条件下，经5级错流萃取，原料的芳烃脱除率可达（89.51±0.03） %，溶剂油收率为（73.33±0.03） %。

Abstract:

The effects of various extractants on removal of aromatics of naphtha derived from the hydrogenation fraction of low temperature coal tar(coal-derived naphtha) were investigated at certain extraction temperature, extraction time, phase separation time and single stage extractant oil volume ratio of 40 ℃,5 min,20 min,1.5 ,respectively. The result showed that the dimethyl suifoxide containing 10 volume fraction N, N-dimethyformamid (V(DMSO):V(DMF)=9:1) regarded as a mixed solvent could obtain better aromatics removal rate. Then the effects of process conditions on liquid-liquid extraction aromatic were explored based on DMSO-DMF using single-factor tests and response surface methodology. The optimized process conditions were found as: extraction temperature of 44.48 ℃,extraction time of 5.30 min, single stage extractant oil volume ratio of 1.69 and phase separation time of 10 min. After five stages counter-current extraction under above process conditions, the aromatics removal rate is 89.51±0.03% and the yield of solvent oil is（73.33±0.03）%。