Preparation method of hydrocracking catalyst

Abstract

The invention discloses a preparation method of a hydrocracking catalyst. The method comprises the steps of preparing an acidic mixed solution A containing hydrogenation reactive metals and silicon, and preparing a sodium metaaluminate alkaline solution B; adding part of the sodium metaaluminate alkaline solution B to the acidic mixed solution A, and then filling CO2; repeating the step 2 for one-six times; then adding turbid liquid of a Y type molecular sieve, mixing the substances uniformly, and aging the mixture; and filtering, drying and forming the mixture, and then washing, drying and roasting the mixture, thus preparing the hydrocracking catalyst. The method has the beneficial effects that not only can the catalyst be formed easily and the strength of the catalyst be improved, but also the pore volume and specific surface area of the catalyst can be increased, the dispersity of metals in the catalyst can be improved, and the capability of the catalyst in processing macromolecules in heavy oil is enhanced, so that the catalyst has higher hydrocracking activity, middle oil selectivity and stability; and the catalyst can be used for a single-section hydrocracking process of a non-refining section or a one-section serial hydrocracking process of a refining section.

Description

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

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

[0007] 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

[0008] What CN101172261A discloses is to adopt sodium metaaluminate alkali solution as the method for precipitating agent to prepare hydrogenation catalyst, and precipitation mainly comes from metaaluminate ion and hydroxide ion, like this easily forms larger precipitation particle in precipitation process, and catalyst material The cohesiveness of the catalyst is poor, and 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