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, preparing a sodium metaaluminate alkaline solution B, adding clear water to a reaction tank, and then filling CO2 into the clear water; and then adding the acidic mixed solution A and the alkaline solution B to the reaction tank in parallel 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 hydrocracking catalyst composition prepared by the method has the advantages of big specific surface area, big pore volume, high strength and high effective utilization rate of reactive metal components, and is especially suitable for a hydrocracking process for producing more middle distillates.

Description

technical field [0001] The invention relates to a preparation method of a hydrocracking catalyst composition for treating heavy hydrocarbons, in particular to a preparation method of a high-activity high-medium oil type hydrocracking catalyst composition. 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, jet fuel, di...

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] US 3954671 disclosed hydrocracking catalyst, US 4313817 disclosed hydroconversion catalyst, CN1253988A disclosed nitrogen-resistant type prolific middle distillate hydrocracking catalyst, The disclosed heavy hydrocarbon hydrocracking catalyst of CN1253989A, these catalysts are prepared by the co-gel method, and the basic precipitant used is all ammonia, although it can be used to process the heavy hydrocarbon prolific middle distillate performance is relatively Ideal hydrocracking catalyst, but there are no effective control measures for the pollution caused by ammonia nitrogen to the environment

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