Abstract: The effect of post-refining reaction temperature on the distribution and properties of hydrocracking products was investigated by using the intermediate base VGO in single stage once-through hydrocracking process, and the reaction thermodynamic data was calculated. The results showed that inthe range of 320-380℃,the post-refining reaction temperature had little effect on product distribution, and the increase of post-refining reaction temperature was beneficial to the improvement of smoke point of jet fuel, cetane index of diesel and BMCI of tail oil, however, the bromine index and sulfur content of the product increased correspondingly. Thermodynamic data of reaction showed that high temperature was unfavorable to the reaction of olefin hydrogenation saturation and mercaptan formation, therefore it was inferred that the formation of mercaptan from olefin and hydrogen sulfide in the low temperature system of the test facility was the main reason for the increase of sulfur content in the product.

Key words: post-refining, hydrocracking, diesel, jet fuel, mercaptan, thermodynamics