焦化二甲苯残液的分离工艺研究

Separation process of coking xylene residue

针对苯加氢过程中产生的二甲苯残液进行分离,通过减压精馏实验并结合化工模拟软件PRO II 9.0建立的二甲苯残液分离模型对其工艺进行研究。研究表明:通过高效精馏,可以实现焦化二甲苯残液中组分的分离;在理论板为60,压力为10k Pa,回流比为15时,可以获得w>99.0%的茚满,回流比为20时,可获得w>99.0%的四氢化萘,单程收率可以达到95%以上。实验与模拟结果为实现工业化分离二甲苯残液制备茚满和四氢化萘产品提供了必要的基础数据。

The separation process for the xylene residue from coking crude benzene hydrogenation process was investigated by vacuum distillation experiments and the xylene residue separation model established by the chemical simulation software PRO II 9.0. Results show that using efficient distillation technology, the separation of coking xylene residue could be realized. To obtain a product purity of above 99% by mass with a recovery of above 95% for indane and tetrahydronaphthalene, the reflux ratios are 15 and 20, respectively, at the theoretical plate number of 60 and pressure of 10kPa. The results provide the necessary basic data for industrial separation of indane and tetrahydronaphthalene products from the xylene residue.