热解重油加氢裂化制取高芳潜石脑油的研究

以哈密热解焦油重质馏分悬浮床加氢裂化后的轻质油为原料,对其性质进行了分析,轻质油保留了煤的基本单元结构特点,富含芳烃类和环烷烃类化合物,氮含量较高;采用200 mL固定床精制-裂化串联装置,对轻质油原料进行了加氢裂化制取石脑油的研究;反应压力15 MPa下,考察了不同温度对加氢裂化反应的影响。结果表明,适宜的裂化段温度为390℃,此温度下,180℃馏分转化率为53.69%,氢耗5.13%,180℃石脑油收率56.8%,裂化后石脑油主要以C_(6-9)类烃类物质为主,其中,环烷烃含量为71.99%,芳烃含量3.13%,芳潜值70.1;以最佳工艺条件下产出裂化石脑油为原料,进行了催化重整制取BTXE的研究,采用石油系中间基石脑油作为对比,裂化石脑油重整后BTXE类物质总产率为55.85%,较石油基石脑油生成量高25.53%,彰显了煤基油的优势和特点,验证了煤热解重油裂化石脑油是制取BTXE类物质良好的原料。

Study on preparation of high aromatic potential naphtha from pyrolysis heavy oil via hydrocracking

The heavy fraction of Hami pyrolysis tar was firstly hydrocracked in a suspended bed reactor, and the as-prepared light product oil was analyzed. The light oil that retains the basic unit structure characteristics of coal and contains a large number of naphthenes and aromatic compounds as well as high nitrogen content was then used to produce naphtha in a 200 mL fixed bed refining-cracking tandem unit. The effect of different temperatures on the hydrocracking reaction was investigated at reaction pressure of 15 MPa. The results show that the optimum cracking temperature is 390℃, at which the conversion of >180℃ fraction is 53.69%, the hydrogen consumption is 5.13%, and the <180℃ naphtha yield reaches 56.8%. The main components of naphtha are C_6-9 hydrocarbons with the naphtha of 71.99%, the naphthene of 3.13% aromatics and the aromatic potential of 70.1. The catalytic reforming of cracked naphtha under optimum conditions to produce BTXE was conducted and compared with that with the middle base naphtha of petroleum series as feed. After reforming, the yield of BTXE from cracking naphtha is 55.85%, 25.53% higher than that from petroleum-based naphtha. The advantages and characteristics of coal-based oil are highlighted. It is verified that naphtha from coal pyrolysis heavy oil hydrocracking is a good raw material for preparing BTXE.