Composite binder, its preparation method and its application

Abstract

The invention discloses a composite binder and its preparation method and use. The preparation method of the composite binder comprises blending aluminum hydroxychloride, aluminum sol and acidic silica sol at a temperature of 20-60 DEG C for 1-10h to obtain a uniform composite silicon-aluminum binder, blending the composite silicon-aluminum binder, kaolin and deionized water, carrying out beating, carrying out spray drying to obtain microspheres, roasting the microspheres, then carrying out hydrothermal crystallization under alkaline conditions, filtering the crystals, washing the filter cake by water and carrying out drying to obtain NaY molecular sieve-containing crystallized microspheres. The preparation method guarantees NaY molecular sieve microsphere crystallinity and a silicon-aluminum ratio, improves a silicon source utilization rate, improves a single kettle yield and realizes good wear resistance of the molecular sieve microspheres.

Description

technical field [0001] The invention relates to a binder used in a catalyst, a preparation method and an application thereof. Background technique [0002] Catalytic cracking is one of the most important heavy oil lightening processes. The catalytic cracking process has low investment, low operating costs, strong adaptability of raw materials, high yield of light products, and mature technology; especially since the 1980s, due to the increasingly heavy and inferior crude oil and the demand for light oil The heavy oil catalytic cracking technology has developed rapidly and has become the main theme of the development of contemporary oil refining technology. The catalytic cracking catalyst is one of the core technologies of catalytic cracking. [0003] FCC catalysts are currently common binder-type catalytic cracking catalysts and in-situ crystallization catalytic cracking catalysts. Among all components of FCC catalysts, NaY molecular sieve is the most important active comp...

AI Technical Summary

Problems solved by technology

[0012] At present, in the preparation of in-situ crystallization type catalytic cracking catalysts in industry, an external silicon source is required to maintain the silicon-aluminum ratio of the system during the crystallization process. The external silicon source is generally water glass, and the external silicon source SiO 2 The ratio of the silicon source to the calcined soil ball is above 0.4, but nearly 50% of this part of the silicon source does not participate in the reaction and remains in the mother liquor, which not only results in a low utilization rate of the silicon source, but also makes the liquid-solid ratio of the system higher, affecting the output of a single pot

[0013] Gu Jianfeng et al. (Progress in Chemical Industry, 2012, 31(10): 2234-2238) used a liquid-phase transparent directing agent to extract and then crystallize the roasted soil balls, without adding a silicon source, and at the same time the liquid-solid ratio decreased, but There are problems such as complex process and long crystallization time

[0014] In the prior art, the in-situ crystallization type catalytic cracking catalyst binder is mainly one or more of sodium silicate, silica sol, aluminum sol and pseudo-boehmite, which can improve the anti-wear performance of the catalyst for the binder There are very few studies on it, and the patent of improving its soil spheroidization performance by using a binder at the same time has not been reported.

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