Preparation method for heavy oil catalytic cracking catalyst

Abstract

The invention provides a preparation method for a heavy oil catalytic cracking catalyst.The preparation method includes the steps that pseudo-boehmite, clay, alumina sol and inorganic acid are added to a reaction still firstly and mixed to be uniform to form matrix slurry, the pH value of the matrix slurry is adjusted to be 0.5 to 2.0 through the acid adding amount, stirring is conducted for 0.5-2 h, then an alkaline medium is added to the matrix slurry to adjust the pH value to be 3.5-5.5, curing is conducted for 1-12 h, a molecular sieve is added, catalytic cracking catalyst slurry is formed in a homogenized mode, the obtained catalytic cracking catalyst slurry is subjected to spray drying, and then the catalyst is obtained.According to the preparation method, on the premise that the anti-abrasion strength of the catalyst is guaranteed, the hole volume of the catalyst can be increased, and the heavy oil cracking capacity of the catalyst can be improved.

Description

technical field [0001] The invention relates to a preparation method of an oil refining catalyst, more particularly to a preparation method of a heavy oil catalytic cracking catalyst. Background technique [0002] The semi-synthetic catalytic cracking catalyst is mainly composed of active component molecular sieve and matrix. The matrix includes two parts: support (such as kaolin) and binder (such as aluminum sol, silica sol). As the main material of catalytic cracking catalyst, the matrix accounts for above 50. In the early semi-synthetic catalysts, the matrix was only used as a carrier, which mainly provided physical properties such as better anti-wear performance and moderate bulk density for the catalyst. Since the 1990s, the heavy and inferior quality of crude oil in the world has become more and more serious. In order to make the heavy oil molecules close to the catalyst active center and realize the orderly cracking of heavy oil macromolecules, in addition to the gen...

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Problems solved by technology

The outstanding problem in the process of preparing the catalyst according to the existing process or the improved process is that the unmodified aluminum sol or acidified pseudo-boehmite is directly added to the matrix slurry or the catalyst slurry, because aluminum ions mainly form Al 13 form exists, while Al 13 The aggregate particle size is small (1nm), which is easy to block the mesopores of the matrix or catalyst, resulting in small pore volume of the catalyst and poor heavy oil cracking ability

Patent CN101624536A adds alkali to the slurry to increase the pH value of the slurry, and then adds acid to reduce the pH value of the slurry, which can improve the stability of catalyst preparation, but the increase in pore volume is limited, and the operation is cumbersome