裂解原料芳烃抽提预处理技术的研究  

Pretreatment of Cracking Feedstock by Aromatic Extraction

作　　者：郭莹[1] 杨晓红[1] 田勇[1] 张永刚[1] 杜志国[1] 王国清[1] 

机构地区：[1]中国石化北京化工研究院,北京100013

出　　处：《石油化工》2014年第3期249-254,共6页Petrochemical Technology

摘　　要：为解决蒸汽裂解生产乙烯过程中石脑油原料的短缺问题,选取芳烃含量为10％～30％（w）的高芳烃含量劣质石脑油为原料,进行环丁砜液液抽提实验和裂解实验,考察了抽提预处理的分离效果和抽提前后石脑油的裂解产物分布情况.实验结果表明,抽提预处理使石脑油原料的芳烃含量降低69％ ～ 94％,芳烃关联指数（BMCI）降低31％ ～ 57％,芳烃萃取率为74.85％ ～ 96.86％,非芳烃回收率为78.11％ ～ 91.50％;石脑油裂解的乙烯收率提高1.67～ 4.48百分点,三烯（乙烯、丙烯和丁烯）收率提高2.43 ～6.98百分点,同时芳烃产量较常规流程将提高13.20％～156.50％.溶剂抽提改质高芳烃含量石脑油是优化蒸汽裂解原料、提高装置经济效益的可行途径.Liquid-liquid extraction of poor naphtha containing high content aromatics（10％-30％（w）） with sulfolane as the extractant and the steam cracking of the extracted naphtha were carried out to solve the shortage of raw materials for the cracking.The effects of the liquid-liquid extraction separation under different conditions and the change of the cracking product distribution were investigated.The results showed that,in the extraction process,the aromatic removal rate was 74.85％-96.86％ and the non-aromatic recovery was 78.11％-91.50％.The extraction pretreatment made the aromatic content decrease by 69％-94％,the bureau of mines correlation index（BMCI） decrease by 31％-57％,ethylene yield increase 1.67-4.48 percentage points,total olefin yield（ethylene,propylene and butadiene） increase 2.43-6.98 percentage points,and the aromatic output increase by 13.20％-156.50％ compared to that of conventional processes.The results indicated that the aromatic extraction could effectively improve the quality of the inferior naphtha as steam cracking feedstock,and be economically feasible.

关 键 词：乙烯 芳烃抽提 蒸汽裂解 裂解原料 石脑油 

分 类 号：TQ221.21[化学工程—有机化工]