Preparation method of hydrocracking catalyst

Abstract

The invention discloses a preparation method of a hydrocracking catalyst. The preparation method comprises the following steps of carrying out low-temperature hydro-thermal treatment on alumina dry gel powder in the ammonia-containing water vapor atmosphere, dipping the alumina dry gel powder subjected to hydro-thermal treatment into a solution containing a hydrogenation active metal ingredient, carrying out drying, and carrying out full grinding, molding, drying and calcination of the alumina dry gel powder with the hydrogenation active metal ingredient, and a molecular sieve in the presence of a peptizer or a binder to obtain the hydrocracking catalyst. The preparation method improves a catalyst pore structure. The hydrocracking catalyst obtained by the preparation method has a large specific surface area and a large pore volume, is conducive to optimized cooperation of a hydrogenation ingredient and a cracking ingredient, has high catalytic activity, and is suitable for hydrocracking yield-increasing of high-quality heavy naphtha from vacuum distillate having a high dry point and poor quality and for a catalytic process for improvement of tail oil product quality.

Description

technical field [0001] The invention relates to a method for preparing a hydrocracking catalyst, in particular to a method for preparing a hydrocracking catalyst for heavy distillate oil. Background technique [0002] Hydrocracking technology has the characteristics of strong adaptability of raw materials, great flexibility of product schemes, high selectivity of target products, good product quality, and high added value. It can directly convert various heavy and low-quality raw materials into clean fuel oil and high-quality chemical raw materials. It has become one of the most important heavy oil deep processing techniques in modern oil refining and petrochemical industries, and has been increasingly widely used at home and abroad. Although the processing capacity of my country's existing hydrocracking units has exceeded 50.0Mt / a, due to the deterioration of domestic crude oil quality year by year, the import of high-sulfur crude oil has increased significantly, and enviro...

AI Technical Summary

Problems solved by technology

Although this type of catalyst has high hydrogenation performance, the pore volume and specific surface area of ​​the catalyst are relatively small, and generally it can only process lighter fractions below diesel oil, and because the metal utilization rate of the catalyst prepared by the co-precipitation method is low, the metal dispersion performance Not good, and the preparation process is complicated, and the product stability is poor, so the catalyst is not cost-effective

[0009] The kneading method can also prepare catalysts with various active metal contents, but the performance of the catalyst prepared by the kneading method is relatively poor, the effective utilization rate of the active metal is low, and the hydrogenation catalyst is rarely prepared by the kneading method in industrial production.