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为充分利用焦化蜡油，可将它作为催化裂化的接合原料，但由于焦化蜡油氮含量高，需进行脱氮处理。开发了一种新型复合溶剂，能对焦化蜡油进行有效的溶剂萃取脱氮处理。提出了萃取剂的组成及温度、剂油比和理论级数等适宜的工艺操作参数。该工艺能将精制油的氮含量从5000μg／g降至1500μg／g以下，而精制油的收率在80％以上。
In order to make full use of coker gas oil, it can be used as the FCC feedstock, but due to the high nitrogen content of coker gas oil, it needs to be denitrified. A new type of compound solvent has been developed for the effective solvent extraction and denitrification of coker gas oil. Proposed extractant composition and temperature, oil-to-oil ratio and the theoretical series and other suitable process parameters. The process can be refined oil nitrogen content from 5000μg / g down to 1500μg / g or less, while the yield of refined oil in more than 80%.