Preparation method of hydrocracking catalyst composition

Abstract

The invention discloses a preparation method of a hydrocracking catalyst composition. The method comprises the steps of preparing an acidic mixed solution A containing hydrogenation reactive metals and silicon and filling CO2 into the solution A; and preparing a sodium metaaluminate alkaline solution B, subjecting the solution B to react with the solution A into which CO2 is filled to prepare gel, then adding turbid liquid of a Y type molecular sieve, mixing the substances uniformly, filtering the obtained mixture, drying the obtained filter cake, and then forming, washing, drying and roasting the filter cake, thus preparing the hydrocracking catalyst composition. The method has the beneficial effects that a clean preparation method is adopted, so not only can the catalyst be easily formed and the strength of the catalyst be improved, but also the pore volume and specific surface area of the catalyst can be increased and the dispersity of metals in the catalyst can be improved, thus the catalyst has higher hydrocracking activity, middle oil selectivity and stability; and the hydrocracking catalyst composition prepared by the method is especially suitable for producing more high-quality naphtha, jet fuel and diesel.

Description

technical field [0001] The invention relates to a hydrocracking catalyst composition and a preparation method thereof, in particular to a hydrocracking catalyst composition capable of producing heavy naphtha, jet fuel and diesel oil and a preparation method thereof. Background technique [0002] At present, the shortage of petroleum resources in the world, the quality of crude oil is deteriorating year by year, the demand for middle distillate oil is increasing, the upgrading of petrochemical products and the stricter environmental regulations have greatly promoted the transformation of heavy oil into lighter products, and constituted an accelerated development of hydrogenation. The power of technology. The main features of hydrocracking technology are strong adaptability of raw materials, high selectivity of product plans and target products, good product quality and high added value, and can directly produce a variety of high-quality petroleum products (such as gasoline, j...

AI Technical Summary

Problems solved by technology

Most of the existing co-precipitation methods for preparing catalysts use NH3·H2O as a precipitating agent, which will produce a large amount of wastewater containing ammonia and nitrogen, causing pollution to the environment

[0006] The hydrocracking catalyst disclosed in US 3954671, the hydroconversion catalyst disclosed in US 4313817, the hydrocracking catalyst disclosed in CN1253988A, the nitrogen-resistant type prolific middle distillate oil, the heavy hydrocarbon hydrocracking catalyst disclosed in CN1253989A, these catalysts are Prepared by the co-gel method, the alkaline precipitant used is all ammonia, although a hydrocracking catalyst with ideal performance for the treatment of heavy hydrocarbons and prolific middle distillates can be obtained, the pollution caused by ammonia nitrogen to the environment is not significant. Too effective governance measures

CN101239324A discloses a method for preparing a high-activity, high-medium oil type hydrocracking catalyst by a co-gel method. The precipitant uses a weakly basic ammonia compound, and there is still the problem of ammonia nitrogen pollution

[0007] CN101172261A discloses a method for preparing a hydrogenation catalyst using a sodium metaaluminate alkali solution as a precipitant, and the precipitation mainly comes from metaaluminate ions and hydroxide ions. In this way, larger precipitated particles are easily formed during the precipitation process, and the cohesiveness of the catalyst material is poor. At the same time, the specific surface area and strength of the catalyst are reduced, which will affect the performance of the catalyst.

If sodium metaaluminate replaces aluminum chloride, aluminum nitrate, aluminum sulfate and other soluble inorganic aluminum salts as the aluminum source, a large amount of NO3-, Cl-, SO42- and other hetero ions, the prepared composite oxide precursors have poor peptization and difficult to form metal materials

Another difficulty in the preparation of catalysts by the co-precipitation method is that the grain size of the metal mixture obtained by different aluminum sources and precipitants varies greatly, which in turn has a great impact on the specific surface area and strength of the catalyst.

In order to reduce pollution, how to solve the problem of poor cohesion of materials produced by the bulk phase cleaning preparation method using sodium metaaluminate instead of ammonia water as precipitant