加氢改质轻脱沥青油生产优化

PRODUCTION OPTIMIZATION OF HYDRO-UPGRADING LIGHT PROPANE DEASPHALTED OIL TO HEAVY LUBE BASE OIL

将石蜡基南阳、江汉混合原油的减压渣油掺入到中间基管输原油的减压渣油中,拓宽了丙烷脱沥青的原料。丙烷脱沥青工艺通过提高混合溶剂中C_4含量,同时提高沉降塔顶温度,获得加氢改质料轻脱沥青油质量和收率二者兼顾的生产优化效果。根据轻脱沥青油对糠醛的临界溶解温度调整糠醛精制装置的剂油比、塔顶温度和塔底温度,通过选用适宜的加氢改质反应温度、降低酮苯溶剂水含量、使用助滤剂等措施,提高了脱蜡油的收率。采用以上优化措施后,从拓宽原料的轻脱沥青油可以生产重质润滑油基础油,并且综合收率有所提高。

Measures for optimizing the production of heavy lube base oil from light propane deasphalted oil（DAO）in SINOPEC Jingmen Company were reviewed. The feedstock of propane deasphalting was broadened by blending the vacuum residue （VR） of Nanyang and Jianghan mixed paraffinic base crude into the VR of intermediate base pipeline crude. The propane deasphalting process was optimized by proper adjusting the C4 content in propane stream and raising the top temperature of settler to obtain light DAO with high yield and good quality simultaneously. In furfural refining unit according to the critical solution temperature of light DAO in furfural, the solvent to oil ratio, top and bottom temperature of the extraction tower were optimized to increase throughput and treated oil yield. Besides optimizing the hydro-upgrading temperature, in ketone-benzol dewaxing unit the water content of solvent was reduced and filter aid was applied to increase the yield of dewaxed oil. Since adopting the above optimization measures, heavy lube base oil was successfully produced by using light DAO from broadened VR feedstock.