Medium oil type hydrocracking catalyst and its preparation method

Abstract

The invention discloses a medium oil type hydrocracking catalyst. Weighed according to the weight of the final catalyst, the catalyst carrier components contain 0-20% of a molecular sieve, 20-50% of amorphous silica-alumina and 5-30% of alumina. Weighed according to the weight of oxide, the catalyst contains 20-50% of a hydrogenation metal component. An amorphous silica-alumina dry rubber powder undergoes hydrothermal processing and then is made with other carrier materials into the catalyst carrier. Then the hydrogenation metal component is loaded by an immersion method to prepare the final catalyst. In comparison with present hydrocracking catalysts, the catalyst provided by the invention has larger pore volume and specific surface area, has appropriate acid content, and has good nitrogen-resistant performance. The catalyst prepared in the invention is applicable to the treatment of vacuum gas oil with heavy and poor quality and hydrotreating process of middle distillate.

Description

technical field [0001] The invention relates to a hydrocracking catalyst and a preparation method thereof, in particular to a hydrocracking catalyst capable of handling inferior feeds with high nitrogen resistance and a preparation method thereof. technical background [0002] In recent years, hydrocracking capacity has continued to increase worldwide, with the fastest growth in the Asia-Pacific region. The continuous growth of my country's economy has also strongly driven the domestic refined oil market to continue to rise. At present, the processing capacity of my country's existing hydrocracking units has exceeded 40.0Mt / a. However, due to the deterioration of crude oil quality year by year, a substantial increase in imported high-sulfur crude oil, and in order to improve economic benefits, refineries have generally adopted crude oil vacuum deep-drawing technology, which has increased the dry point of vacuum distillate oil from 520°C to 520°C. At around 600°C, its densit...

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Problems solved by technology

In this method, all the catalyst supports are subjected to hydrothermal treatment. Since the amorphous silica-alumina and alumina are kneaded first, the uncalcined amorphous silica-alumina raw material and alumina raw material have high chemical activity, and the amorphous silica-alumina and alumina A certain glue-linking effect is formed. Under the condition of hydrothermal treatment, the two form a synergistic crystal transformation effect, which has an adverse effect on the property adjustment of amorphous silicon-alumina. Some pores are destroyed, which affects the amorphous silicon-alumina. In addition, the hydrothermal treatment of all the carriers is not conducive to energy saving

[0006] US4738767 discloses a hydrocracking catalyst, the main acidic component is amorphous silica-alumina, the preparation method of amorphous silica-alumina used in the carrier is to precipitate aluminum into silica gel, which causes the specific surface area and pore size of silica-alumina Small capacity, low amount of amorphous aluminosilicate acid and uneven acid distribution, the prepared catalyst has poor activity

US4517074 also adopts the above-mentioned amorphous silica-alumina, and adds an appropriate amount of molecular sieves. The content of silicon dioxide in the amorphous silica-alumina has reached more than 50%, which reduces the anti-nitrogen ability of the prepared catalyst and makes it difficult to ensure the activity of the catalyst.

[0007] Through the above analysis, whether the catalyst carrier is subjected to hydrothermal treatment or the catalyst prepared by the conventional method has low nitrogen resistance and poor catalyst activity, it cannot meet the requirements of long-term operation of the hydrocracking unit.

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