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Method for preparing molecular sieve

A molecular sieve and gas phase technology, applied in the field of preparing molecular sieves, can solve the problems that the gas phase ultra-stable process is difficult to industrialize, increase production costs and environmental protection costs, endanger the health of operators, etc., and achieve continuous gas-phase ultra-stable reaction and labor intensity. Reduced and less labor-intensive effects

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

And, in the method of above-mentioned prior art, in order to guarantee the high silicon content of the obtained molecular sieve, generally all make SiCl 4 far excess, excess SiCl 4 Undoubtedly increased production costs and environmental protection costs
On the other hand, the above-mentioned methods all require very complicated manual operations, such as: manual loading, manual unloading and long-term purging of pipelines after the completion of the reaction, which not only bring about high labor intensity but also low production efficiency. problems, moreover, molecular sieve dust and excess SiCl during loading and unloading 4 It also causes serious environmental pollution and seriously endangers the health of operators.
Therefore, the above-mentioned tank-type gas-phase ultra-stable process is difficult to carry out industrial production

Method used

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  • Method for preparing molecular sieve
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  • Method for preparing molecular sieve

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preparation example Construction

[0019] According to the method for preparing molecular sieve provided by the present invention, although as long as described molecular sieve and gas phase SiCl 4 Contacting molecular sieves with SiCl in a continuous flow 4 The purpose of the present invention can be achieved by suspending contact, but preferably, in order to ensure that the molecular sieve is suspended in the SiCl-containing 4 The absence of gas flow in the tubular reactor further reduces the SiCl 4 The consumption of gas, the present invention preferably described molecular sieve and gas phase SiCl 4 The contacting is carried out in the presence of an inert carrier gas flow. The inert gas flow can be a variety of non-interfering molecular sieves and gas phase SiCl 4 The gas flow for the reaction may be, for example, one or more of air flow, nitrogen flow, and gas flow of Group 0 elements in the periodic table. Due to SiCl 4 Sensitive to water, therefore, preferably, the above-mentioned inert carrier gas...

Embodiment approach

[0033] According to a preferred embodiment of the present invention, the pipe body 13 further includes a second inclined section 133, one end of the second inclined section 133 is connected to the other end of the vertical section 132, and the first The feed port is located at the other end of the second inclined section 133 . This can prevent the molecular sieve solid material from flowing too fast under the action of gravity, and increase the contact reaction time between the reaction materials.

[0034] Further preferably, the position of the first feed inlet is higher than the position where the second inclined section 133 is connected to the vertical section 132, so that the molecular sieve solid material can directly enter the second inclined section 133 by its own gravity. In section 133, it can then be transported further under the entrainment of the carrier gas.

[0035] The included angle between the second inclined section 133 and the vertical section 132 can be 10...

Embodiment 1

[0053] Made of industrial grade stainless steel with a thickness of 3mm NiCr18Ti figure 2 In the shown molecular sieve vapor phase silicon replenishment equipment, the tube body 13 of the tubular reactor 1 is composed of a first inclined section 131, a vertical section 132 and a second inclined section 133, the length of the first inclined section 131 is 20 meters, and the diameter is 0.8 meters, the length of the vertical section 132 is 40 meters, and the diameter is 0.8 meters. The length of the second inclined section 133 is 15 meters, and the diameter is 0.8 meters. The vertical section 132 is perpendicular to the horizontal plane, and the axis of the first inclined section 131 and The angle α between the horizontal planes is 75° (that is, the angle between the first inclined section 131 and the vertical section 132 is 15°), and the angle β between the axis of the second inclined section 133 and the horizontal plane is 65° (that is, the angle between the second inclined s...

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Abstract

The invention relates to a method for preparing a molecular sieve. The method comprises that: with carrying by inert carrier gas flow, a molecular sieve flows along with the inert carrier gas, and contacts gas phase SiCl4 for 10 s-100 min under a flowing state; the molecular sieve and the gas phase SiCl4 are heated during the contacting process, such that the contacting temperature of the molecular sieve and the gas phase SiCl4 is 250-700 DEG C. According to the method for preparing the molecular sieve, the molecular sieve can contact the gas phase SiCl4 under the flowing state, such that the contact reaction of the molecular sieve and the SiCl4 can be continuously performed; with controlling the flow rate of the carrier gas, the contacting time of the molecular sieve and the SiCl4 can be controlled, such that the contact reaction of the molecular sieve and the SiCl4 can be completely performed in a tubular reactor; with heating the molecular sieve and the gas phase SiCl4 during the contacting process, the molecular sieve can contact the gas phase SiCl4 at the different temperatures so as to obtain the molecular sieves with different silica alumina ratios.

Description

technical field [0001] The invention relates to a method for preparing molecular sieves. Background technique [0002] Molecular sieve is a widely used material in catalytic cracking catalyst, and it is also a very important component. The performance of molecular sieve directly affects the reaction performance of catalytic cracking catalyst. According to different needs, molecular sieves can be modified differently to meet the requirements of use. For example, molecular sieves with a high silicon-to-aluminum ratio are generally considered to be required for catalytic cracking catalysts. [0003] In the preparation of molecular sieves with a high silicon-aluminum ratio, there are mainly the following methods: ammonium fluorosilicate method for aluminum and silicon supplementation, hydrothermal method for aluminum and silicon supplementation, and gas phase chemical method for aluminum and silicon supplementation. [0004] The method of ammonium fluorosilicate to extract alu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02C01B39/24B01J29/00B01J29/08
Inventor 田辉平周灵萍朱玉霞许明德张蔚琳唐立文
Owner CHINA PETROLEUM & CHEM CORP
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