裂解汽油苯乙烯抽提蒸馏工艺的研究与开发

系统研究了从裂解汽油C8馏分中回收苯乙烯产品的工艺过程，包括溶剂、阻聚剂的评选、抽提蒸馏小试研究及30 kt/a裂解汽油苯乙烯抽提蒸馏装置工艺包开发与工业试验。结果表明，以裂解汽油C8馏分为原料经过抽提蒸馏、脱色精制后，苯乙烯色度小于10号，纯度达到99.80%。裂解汽油苯乙烯抽提成套工艺在广东新华粤石化股份有限公司30 kt/a苯乙烯抽提装置上进行了首次工业应用，该装置长期稳定运行，各项参数达到设计要求。标定结果表明，产品苯乙烯纯度99.87%，色度小于10号，质量达到国家优级品标准，包括预分馏、苯乙炔加氢在内的全流程苯乙烯回收率为94.3%。

DEVELOPMENT OF EXTRACTIVE-DISTILLATION TECHNOLOGY FOR STYRENE RECOVERY FROM PYROLYSIS GASOLINE

The process for styrene recovery from pygas C8 fraction by extraction-distillation technology was investigated. The selection of solvent, polymerization inhibitor and bench scale test were tested, meanwhile the process design package of 30 kt/a extraction-distillation unit and industrial test were finished. The results show that the color of styrene product after decoloration refining is less than 10, the purity is 99.80%. This technology is successfully applied in extractive-distillation plant of Guandong Xinhuayue Petrochem Co. The operation is stable and the operation parameters are all achieved. The industrial results show that the purity of styrene is 99.87%, the platinum - cobalt color is less than 10. The product quality achieves the national superior grade. The total recovery of the process, including pre-fractionation, phenylacetylene hydrogenation, is 94.3%.