One kind hydrocracking process

One kind hydrocracking process, the fresh feedstock oil is introduced at the same time and manner of flow hydrotreating reactor and hydrocracking reactor; reactor hydrotreating reactor effluent is separated to obtain a light naphtha fraction, tungsten brain oil fractions, middle distillate oil and tail oil fractions; hot high pressure separator provided in an upper section of the reaction zone, filling hydrorefining catalyst; all or part of the tail into the oil fraction hydrocracking reactor, a reaction hydrocracking reactor effluent and part of the feed oil into the hydrotreating reactor together. The present invention provides a method capable of handling heavy fraction oil, the mass production of middle distillates, hydrorefining catalyst is loaded on top of the hot high pressure separator can improve the quality of light products.