丁二烯抽提装置废弃的粗乙腈中乙腈质量分数达90%以上,具有回收利用价值。采用精馏与吸附相结合的方法净化粗乙腈,逐步去除粗乙腈中有机杂质与水分。分析结果显示,粗乙腈中含有30多种有机杂质主要含有丙酮、乙醇等轻组分杂质,及C₈~C₁₂烃类等重组分杂质。经处理后丙酮、乙醇、重组分、水的去除率依次可达95.7%、88.4%、97.1%、99.2%,且杂质氨、铁与铜含量低于检出限,获得质量分数达99.75%的高纯乙腈。

Spent acetonitrile from butadiene extraction unit contains more than 90% of acetonitrile,which is worth recycling.A method combining distillation and adsorption is adopted to purify spent acetonitrile,and remove organic impurities and water gradually.It is shown through qualitative analysis that spent acetonitrile contains more than 30 kinds of organic impurities such as acetone,ethanol,and C₈-C₁₂ hydrocarbons.After treatment,the removal ratios of acetone,ethanol,heavy fractions and water can reach 91.5%,88.4%,97.1% and 99.2%,respectively.The contents of ammonia,iron and copper in purified acetonitrile are lower than the detection limit,and the obtained acetonitrile has a mass percentage as high as 99.75%.

张丽(1991-),女,硕士,工程师,研究方向为分离净化技术,952484866@qq.com