环保型苯乙烯精馏缓聚剂QMPS的使用及与DNBP的对比分析

Use of Environmental Friendly Styrene Distillation Retarder QMPS and Its Comparative Analysis with DNBP

青岛炼化苯乙烯装置在高温精馏过程中易发生苯乙烯的聚合反应,易产生对产品具有毒性的苯乙烯聚合物,需要在精馏过程中加入缓聚剂减缓其聚反应发生的速度,在初始运行过程中使用的缓聚剂为DNBP,该缓聚剂为DNBP-50%乙苯溶液,在精馏过程中能有效减缓聚合反应的发生,但因其毒性较高极易溶于水,易造成水体污染,且具有添加量较大、焦油产量多、含氮量大等缺陷,在生产中暴露出很多不足。通过调研将缓聚剂更换为QMPS,该缓聚剂为QMPS-70%乙苯溶液,有效缓聚组分减少,能够减少毒性,且不易溶于水,有效避免了生产过程中的水体污染。通过QMPS近三个月的使用情况分析及两种缓聚剂对聚合物生成的抑制能力、对苯乙烯精馏操作的影响程度、焦油等生产废料的产生量和经济指标等对比,试用效果良好,可以完全替代DNBP作为苯乙烯装置精馏缓聚剂进行工业使用。

The polymerization of styrene easily occurred in the styrene unit at Sinopec Qingdao Refining and Chemical Co.,Ltd.during high-temperature distillation,and styrene polymers that are toxic to the products were easily produced.It was necessary to add retarders during distillation to slow down the polymerization reaction.The retarder used during the initial operation was DNBP,a DNBP-50%ethylbenzene solution that can effectively slow down the occurrence of polymerization reaction during distillation.However,it easily caused water pollution due to its high toxicity and high water solubility,and it had many shortcomings in production such as large amount of addition,high tar production and high nitrogen content.After investigation,the DNBP was replaced with QMPS,a QMPS-70%ethylbenzene solution.With less effective retarder components,its toxicity can be reduced and it is not easily soluble in water,effectively avoiding the water pollution during production.Through the analysis of the usage of QMPS in the past three months as well as the comparison of these two retarders in terms of the ability to inhibit polymer generation,the degree of impact on styrene distillation operation,the amount of production waste such as tar,and the economic indicators,the QMPS has good trial results and can completely replace DNBP as the distillation retarder for industrial use in styrene plants.