常二线馏分油纤维膜接触器脱酸技术的优化研究

STUDY ON THE OPTIMIZATION OF FIBER MEMBRANE CONTACTOR TECHNOLOGY FOR DEACIDIFICATION OF THE 2nd SIDE CUT FROM ATMOSPHERIC COLUMN

针对中海油沥青公司200 kt/a常二线馏分油纤维膜脱酸装置存在的皂相带油、废液排放量大、油水乳化严重、精制油收率低等问题,采用前期开发的馏分油脱酸剂,对常二线馏分油纤维膜接触器脱酸技术进行了优化研究。研究结果表明,在脱酸剂与原料油的体积比为0.6:1、脱酸剂中碱与原料油中石油酸的摩尔比为18、反应温度为50℃、洗水与原料油体积比为0.12:1的条件下脱酸剂可以循环使用18次,烧碱利用率为100%,精制油收率为98.4%,精制油酸值小于0.05 mgKOH/g,石油酸粗酸值为177.8 mgKOH/g,达到石油酸一级品75号酸值质量标准(SH/T0530—92);洗水经回收后可用于配制脱酸剂,实现洗水零排放。

In order to solve the problems in the 200 kt/a fiber membrane contactor unit for distillates deacidification at China Offshore Bitumen Company, such as emulsifier phase containing oil, huge quantity of waste liquid, serious oil-water emulsification and the low yield of refined oil, the optimization of fiber membrane contactor technology for deacidification of the 2nd side cut from atmospheric column was studied using a deacidification agent developed early. Results showed that under the conditions of a deacidification agent to feed oil volume ratio of 0.6, a base （in deacidification agent） to petroleum acid （in feed） molar ratio of 18, a reaction temperature of 50℃ and a wash water to feed volume ratio of 0.12, the deacidification agent could be repeatedly used 18 times, the utilization rate of alkali reached 100%, the yield of refined oil reached 98.4% with an acid value of less than 0.05 mgKOH/g. The raw acid value of petroleum acid was 177.8 mgKOH/g, which could meet the quality standard of No.75 first class petroleum acid （SH/T0530-92）. The recovered wash water could be used in the preparation of deacidification agent to realize zero wash water discharge.