Process for producing high-performance catalyst for hydrocracking

Abstract

The invention relates to a method for preparing a high-performance hydrocracking catalyst, which comprises the following steps: preparing amorphous aluminium-silicon into a paste material of which the pH value is between 3.0 and 5.5, evenly mixing Y zeolite solid powder of modified rare earth with the paste material of the amorphous aluminium-silicon, and then drying and dehydrating the mixture to prepare a moldable paste so as to prepare a catalyst carrier through molding, drying, and calcining, and finally obtaining the final hydrocracking catalyst by loading hydrogenation metal components through an impregnation method. The hydrocracking catalyst prepared by the method has the advantages of high activity and middle oil selectivity, and strong nitrogen resisting performance and water resistance, thus the hydrocracking catalyst can be used in the process of an unrefined single-stage hydrocracking, which not only can be used for processing heavy oil fraction of oil, but also can be used for processing heavy raw materials of other sources, such as the heavy distillate of coal liquefaction oil.

Description

technical field [0001] The invention relates to a preparation method of a high-performance hydrocracking catalyst, in particular to a preparation method of a hydrocracking catalyst containing modified Y-type molecular sieves with strong impurity resistance capability. Background technique [0002] At present, the world's oil resources are insufficient, the crude oil has become heavier and worse, and the impurity content has increased, while the demand for clean and high-quality light fuels is increasing, especially the demand for clean middle distillates. In addition, with the rising price of natural oil, various other sources of energy are increasingly entering the processing ranks, such as direct coal liquefied oil, indirect coal liquefied oil, coal tar, shale oil, animal and vegetable oils, etc. Feedstocks from these sources share a common feature of higher oxygen content compared to natural oil, which presents new problems for further processing. [0003] With increasin...

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Problems solved by technology

[0005] The hydrocracking catalyst using only amorphous silica-alumina has strong nitrogen and water resistance, but the activity of the catalyst is low, it needs to be operated at a high reaction temperature, the operation period is short, and the product distribution changes greatly. To meet the needs of modern hydrogenation technology, amorphous silica-alumina and molecular sieves are usually used as cracking components of hydrocracking catalysts

[0006] Chinese patent CN1253988A disclosed a heavy hydrocarbon hydrocracking catalyst prepared by a co-gel method on May 24, 2000. The cracking component used is the modified Y-type molecular sieve reported by ZL96119840.0. The Y-type molecular sieve involved is Strong acid molecular sieve, the catalyst has high cracking activity, but the selectivity of medium oil is poor

[0007] Chinese patent CN1351124A disclosed on May 29, 2002 a high and medium oil selective hydrocracking catalyst prepared by the co-gel method. The molecular sieve used is a modified Y-type molecular sieve. This Y-type molecular sieve is an acid center The strength is low, and it is a molecular sieve of weak acid type, so the catalyst has low hydrocracking activity and high selectivity for medium oil

CN1253859A discloses a high and medium oil type hydrocracking catalyst, the catalyst contains 4-40% Y molecular sieve and 10-50% amorphous silicon aluminum and other components, because the molecular sieve of the catalyst is not resistant to nitrogen with low crystallinity The superhydrophobic Y molecular sieve, so the catalyst is not strong against nitrogen and can only be used in the hydrocracking process with pre-refining

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