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Preparation method of catalytic cracking promoter

A catalytic cracking aid, silicon tetrachloride technology, which is applied to hydrocarbon cracking to hydrocarbon production, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as difficult synthesis, large amount of template agent polluting the environment, etc., and achieve stable product performance. , the effect of high production efficiency and low labor intensity

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Description
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Problems solved by technology

[0016] The purpose of the present invention is to provide a method for the problems in the preparation of high silicon-aluminum ratio ZSM-5 molecular sieves, such as the difficulty in synthesis and the pollution of the environment caused by the large amount of template agent used, as well as the problems existing in the existing continuous gas phase ultra-stable modification process. Method for preparing ZSM-5 molecular sieve with high silicon-to-aluminum ratio and catalytic cracking propylene auxiliary agent by continuous gas-phase dealumination and silicon supplementation suitable for industrial production

Method used

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  • Preparation method of catalytic cracking promoter

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preparation example Construction

[0029] In the method for preparing catalytic cracking propylene additives provided by the present invention, NaZSM-5 molecular sieves are continuously introduced into the gas phase superstable reactor, so that the NaZSM-5 molecular sieves generally move continuously from the molecular sieve inlet without carrier gas delivery Go to the molecular sieve outlet, and contact with the silicon tetrachloride gas in the gas-phase ultra-stable reactor to carry out the ultra-stable reaction. Simultaneously, silicon tetrachloride was continuously introduced into the reactor.

[0030] In the method for preparing catalytic cracking propylene additive provided by the present invention, silicon tetrachloride can be introduced in the reactor in liquid phase and then vaporized in the reactor and reacted with NaZSM-5 molecular sieve, but in order to make the reaction uniform, preferably tetrachloride Silicon is vaporized and introduced into the gas-phase ultrastable reactor. Introduce NaZSM-5 m...

Embodiment approach

[0042] According to the second specific embodiment of the method for preparing catalytic cracking propylene auxiliary agent provided by the present invention, a kind of gas phase superstable reactor such as image 3 As shown, the gas phase ultra-stable reactor includes: a reactor tube body, a reactor flight plate 11, a baffle plate 21, a molecular sieve inlet 31, a gas phase silicon tetrachloride inlet 41, a molecular sieve outlet 51, an inner casing 61 and a gas outlet 71 , the reactor may also include a tube rotation drive mechanism (not shown). Silicon tetrachloride and NaZSM-5 molecular sieve are respectively introduced in the gap between sleeve pipe 61 and gas phase superstable reactor tube wall through silicon tetrachloride inlet 14 and molecular sieve inlet 31, and contact reaction, and wherein copy plate 11 can make tube The NaZSM-5 molecular sieve in the body is turned over, which is beneficial to the mixing of the NaZSM-5 molecular sieve and silicon tetrachloride, an...

Embodiment 1

[0066] Made of industrial grade stainless steel with a thickness of 3mm NiCr18Ti figure 2 In the molecular sieve gas-phase silicon replenishment equipment shown, the upper part of the gas-solid separator 2 is cylindrical with a diameter of 6 meters and a height of 14 meters, and the lower part is conical with an opening with a cone angle of 45°, and a valve is provided at the opening , the outlet is located at a position 1 meter away from the top of the gas-solid separator, and the absorption tower 3 is filled with an aqueous sodium hydroxide solution with a concentration of 10 mol / liter. The absorption tower 3 and the gas-solid separator 2 are connected by a conduit, and the conduit goes deep into the Sodium hydroxide aqueous solution.

[0067] Reactor 1 is a tubular reactor, such as Figure 5 As shown, the total length of the pipe body is 80 meters, and the diameter of the pipe body is 0.8 meters. The pipe body of the reactor is made into a ring. The reactor includes an up...

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Abstract

The invention relates to a preparation method of a catalytic cracking promoter. The method comprises the following steps: preparing a high-silicon ZSM-5 molecular sieve, and mixing and pulping and pelletizing the high-silicon ZSM-5 molecular sieve and a binder and clay, wherein the preparation method of the high-silicon ZSM-5 molecular sieve comprises the following steps: introducing NaZSM-5 molecular sieve crude powder into a gaseous-phase ultra-stable reactor, moving the NaZSM-5 molecular sieve crude powder to a molecular sieve outlet of the gaseous-phase ultra-stable reactor from a molecular sieve inlet of the gaseous-phase ultra-stable reactor under the situation of no carrier gas conveying, and performing contact reaction of the NaZSM-5 molecular sieve crude powder and gaseous phase SiCl4 in the gaseous-phase ultra-stable reactor. According to the preparation method, the ZSM-5 molecular sieve with high silica-alumina ratio can be continuously prepared, and apropylenecatalytic cracking promoter can be further prepared.

Description

technical field [0001] The invention relates to a preparation method of a catalytic cracking additive, more precisely, relates to a method for preparing a ZSM-5 molecular sieve with a high silicon-aluminum ratio by using a gas-phase chemical method to extract aluminum and supplement silicon, and then to prepare a catalytic cracking propylene additive. Background technique [0002] In addition to the cracking catalyst used in the catalytic cracking process, there are also a variety of catalytic cracking additives that play an auxiliary role. Increase the octane number of gasoline, increase the yield of liquefied gas and the concentration of propylene in it, and promote the conversion of CO into CO 2 , passivate the toxicity of heavy metal impurities in raw materials to catalyst activity and reduce SO in regeneration flue gas x content and so on. The use of additives has many advantages. Adding additives can trigger a certain reaction and work; when the addition of additives...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C07C11/06C07C4/06
CPCY02P20/52
Inventor 刘子阳周灵萍张杰潇张蔚琳许明德田辉平朱玉霞
Owner CHINA PETROLEUM & CHEM CORP
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