Studies On Coking Paraffin Oil's Characters And Processing Method

With the continuous deepening refining for crude oil resources and the rapid increase of market's demand for light oil, the feedstock of FCC is more heavy and diverse. In recent years, the processing coking paraffin oil in FCC has become a major way for expanding the source of FCC feedstock and enhancing efficiency of FCC. Based on the evaluating coking paraffin oil's characters totally, the paper discusses processing methods by using coking paraffin oil in Lanzhou Petrochemical Company.Through studyed coking paraffin oil's characters and optimized parameters of operation, evaluate yield of coking paraffin oil and the characters of it. We draw conclusions that the coking paraffin oil of Lan zhou petrochemical company contains a higher sulfur,nitrogen, especially in basic nitrogen and olefin. Through evaluating the cracking properties evaluation and catalyst selecting evaluation by blending coking paraffin oil into FCCU as feedstock in laboratory, the effect of the basic nitrogen concentration in the coking paraffin oil on distributions of products and total conversion are studied at the same time the effect of LBO-12,LBO-16,LHO-1 catalyst on distributions of products and heavy oil cracking ability are investigated..The tests results show that the distributions of products varied after blending 5% coking paraffin oil in FCC feed. The basic nitrogen concentration in the FCC feed can deactivate cracking catalyst that is the main reason for dropping conversion rate. The yield of gasoline is reduced. The yield of diesel and heavy oil are increased. Through the catalyst select evaluation, LHO-1 catalyst on distributions of products and heavy oil cracking ability are advantage of LBO-12 catalyst.According to the character of coking paraffin oil and the research of the cracking properties, the methods of processing coking paraffin oil in FCC are put forward and carry out an industrial experiment in 1,400,100 tons per year FCC. The result showed that gasoline and qualities of diesel product can meet the product specification. In light of the distribution of products, the yield of gasoline is reduced to 1.17%, the yield of diesel is increased to 0.84%, and the yield of heavy oil is increased to 0.87%. According to the situation of production in Lanzhou Petrochemical Company, the logical conclusion is made that coking paraffin oil could only be refined by proper ratio mixing with straight run oil.