基于离子液体的高酸原油脱酸效果研究  

STUDY ON REMOVING NAPHTHENIC ACIDS FROM HIGHLY ACIDIC CRUDE OIL BY FORMING IONIC LIQUIDS

作　　者：师丽娟[1] 沈本贤[1] 汪恭群[1] 

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《石油炼制与化工》2008年第12期16-20,共5页Petroleum Processing and Petrochemicals

摘　　要：利用咪唑和环烷酸反应生成与原油极性差异大、易于分离的离子液体,脱除原油中的环烷酸。考察了咪唑含量、剂油比、反应时间、反应温度和搅拌速率对高酸原油一级脱酸效果的影响,并在所选的一级脱酸反应条件下,进一步考察了三级逆流萃取的脱酸效果。结果表明,在咪唑质量分数为30%、剂油质量比为0.4、反应时间5 min、反应温度30℃、搅拌速率300 r/min的条件下,北疆原油的一级脱酸率可达61.5%,酸值较低的蓬莱原油的一级脱酸率可达68.6%,酸值更低的1号和2号调合油一级脱酸率分别达到了70.6%和72.2%。试验所用的四种原油在剂油质量比为0.4时,三级逆流萃取的脱酸率可以提高到75%左右;当剂油质量比增大到0.6时,三级逆流萃取的脱酸率可达到84%以上。A basic deacidification agent, imidazole in ethanol solution, was used to remove naphthenic acids from various acidic crude oils by forming ionic liquids, which could be easy to be separated from crude oil due to their significant differences in polarities. The effects of imidazole content in ethanol, reagent/oil ratio, reaction time, reaction temperature and blending intensity on the acid removal rate were studied and optimum reaction conditions of single stage extraction were obtained. Four crude oils with acid number from high to low in the order of Beijiang crude〉Penglai cruder〉 blending cruder2- blending crude were involved in the study. Results showed that under the conditions of an imidazole content of 30%,a reagent/oil ratio of 0.4,a reaction time of 5 min,a reaction temperature of 30 ℃ and with a blending intensity of 300 r/min,the 1-stage acid removal rates of Beijiang crude,Penglai crude,I^# blending crude and 2^# blending crude were 61.5%,68.6%,70.6% and 72.2%,respectively. When 3-stage countercurrent extractions were carried out for these four crude oils,the acid removal rates at a reagent/oil ratio of 0.4 and 0.6 reached about 75% and more than 84%,respectively.

关 键 词：高酸原油 环烷酸 咪唑 离子液体 

分 类 号：TE624.55[石油与天然气工程—油气加工工程]