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Modification method of molecular sieve, modified molecular sieve and application of modified molecular sieve

A molecular sieve and modification technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, catalytic cracking, etc., can solve the problems of high crystallinity and secondary pore structure, poor thermal and hydrothermal stability of high-silicon molecular sieves, etc. , to achieve high heat and hydrothermal stability, reduce coke formation, and low energy consumption

Active Publication Date: 2018-12-04
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] The purpose of the present invention is to provide a method for modifying molecular sieves by overcoming the defects of high silicon molecular sieves in the prior art that have poor thermal and hydrothermal stability, high crystallinity and secondary pore structure. The obtained modified molecular sieve and the application of the modified molecular sieve in catalytic cracking

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  • Modification method of molecular sieve, modified molecular sieve and application of modified molecular sieve
  • Modification method of molecular sieve, modified molecular sieve and application of modified molecular sieve
  • Modification method of molecular sieve, modified molecular sieve and application of modified molecular sieve

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Embodiment approach

[0053] According to a preferred embodiment of the present invention, the conditions of the hydrothermal ultra-stable treatment include: the temperature is 350-480°C, the time is 0.5-3h, and the amount of superheated steam is 0.15-0.45 per kilogram of molecular sieve. kg, more preferably, the temperature is 390-460°C, the time is 1-2.5h, and the amount of superheated steam is 0.3-0.42 kg per kg of molecular sieve. Adopting the preferred embodiment of the present invention is more conducive to improving the relative crystallinity of the prepared modified molecular sieve.

[0054] In the present invention, the amount of steam used refers to the amount passed into the reaction device (calcination furnace) during the hydrothermal ultra-stable treatment process.

[0055] In the present invention, the hydrothermal ultra-stable treatment refers to relatively mild hydrothermal treatment.

[0056] The present invention has a wide range of conditions for the roasting, as long as the mol...

Embodiment 1

[0174] The modification method provided in this embodiment is as in figure 2 The modification of the molecular sieve shown in the equipment (the NaY molecular sieve is commercially available, so the NaY molecular sieve synthesis reactor 111 and the first filter device 112 were not used). in,

[0175](1) In the NaY molecular sieve exchange device 113, 3000kg NaY molecular sieve (on a dry basis) is mixed with decationized water, and then RE (NO 3 ) 3 Solution (rare earth solution concentration is RE 2 o 3 Calculated as 335g / L), among them, NaY molecular sieve (in dry basis), rare earth salt (in RE 2 o 3 ) and water with a weight ratio of 1:0.18:15, carry out ion exchange reaction in NaY molecular sieve exchange device 113, the temperature of ion exchange reaction is 95°C, the time is 50min, and the molecular sieve slurry that has been exchanged is passed through the second filter The device 114 (belt filter) filters and washes to obtain a filter cake.

[0176] (2) The fi...

Embodiment 2

[0180] (1) In the NaY molecular sieve exchange device 113, 4000kg NaY molecular sieve (on a dry basis) is mixed with decationized water, and then RE (NO 3 ) 3 Solution (rare earth solution concentration is RE 2 o 3 Calculated as 335g / L), among them, NaY molecular sieve (in dry basis), rare earth salt (in RE 2 o 3 ) and water with a weight ratio of 1:0.18:12, carry out the ion exchange reaction in the NaY molecular sieve exchange device 113, the temperature of the ion exchange reaction is 90°C, and the time is 60min, and the molecular sieve slurry that has been exchanged is passed through the second filter The device 114 (belt filter) filters and washes to obtain a filter cake.

[0181] (2) The filter cake of step (1) is directly sent into the dual-function roasting furnace 115 for hydrothermal ultra-stable treatment and roasting. The difference between the dual-function roasting furnace 115 and the dual-function roasting furnace disclosed in Embodiment 1 is that, The enti...

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Abstract

The invention relates to the field of molecular sieve preparation, and discloses a modification method of a molecular sieve, a modified molecular sieve and an application of the modified molecular sieve. The modification method of the molecular sieve includes the steps of carrying out an ion exchange reaction on a NaY molecular sieve, carrying out hydrothermal superstability treatment, carrying out roasting, carrying out a gas-phase chemical dealumination and silicon supplementation reaction and carrying out gas-solid separation. The hydrothermal superstability treatment and roasting method make the temperature of the roasted molecule sieve be 350-600 DEG C, and the solid content not less than 98% by weight. The modification method provided by the invention has simple process flow, greatlyreduces the production energy consumption of high-silicon molecular sieves, and the prepared modified molecular sieve has high crystallinity and secondary pore structure, as well as high thermal andhydrothermal stability.

Description

technical field [0001] The invention relates to the field of molecular sieve preparation, in particular to a molecular sieve modification method, the modified molecular sieve prepared by the method and its application. 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 high silicon-aluminum ratio, there are mainly the following methods: ammonium fluorosilicate method to extract aluminum and supplement silicon, hydrothermal method and gas phase chemical method to extract alumi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24B01J29/08C10G11/05
CPCB01J29/084B01J2029/081B01J2229/12B01J2229/16C01B39/24C01P2006/12C01P2006/14C10G11/05
Inventor 周灵萍张蔚琳陈振宇袁帅许明德田辉平
Owner CHINA PETROLEUM & CHEM CORP
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