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 method for preparing a high-performance hydrocracking catalyst, in particular to a method for preparing a hydrocracking catalyst containing modified Y-type molecular sieves and having strong impurity resistance. Background technique [0002] At present, the world's oil resources are insufficient, crude oil becomes heavier and worse, and the impurity content increases, while the demand for clean high-quality light fuels continues to increase, especially the demand for clean middle distillates increases faster. In addition, as the price of natural oil continues to rise, various sources of energy are increasingly being processed, such as direct coal liquefied oil, coal indirect liquefied oil, coal tar, shale oil, animal and vegetable oils, etc. Raw materials from these sources are characterized by a higher oxygen content compared to natural petroleum, which poses new problems for further processing. [0003] As environmental re...

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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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