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Method for modifying molecular sieve

A molecular sieve and modification technology, applied in the direction of octahedral crystalline aluminum silicate zeolite, crystalline aluminosilicate zeolite, etc.

Active Publication Date: 2012-03-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, due to the strong viscosity of molecular sieves, ion exchange resins are used to exchange molecular sieves, and molecular sieves usually adhere to the resin and are not easy to elute; The resin is easy to block on the sieve holes, and the viscosity of the molecular sieve makes the separation incomplete, which increases the difficulty of resin regeneration and causes waste of molecular sieve

Method used

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  • Method for modifying molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The modification process adopted in this embodiment is: resin primary exchange→roasting→resin secondary exchange→roasting→product. The specific operation process is as follows:

[0032] First, weigh 1000g of dry NaY particles, and configure it into a NaY slurry with a total volume of 7L in the beating container T-1. The amount of resin in the resin column 3 is 2400ml. After the slurry is separated in the ceramic membrane, the obtained clear water enters the resin column. , the thick slurry enters the beating container, and the effluent from the resin column also enters the beating container, and reacts at an exchange temperature of 30°C for 60 minutes, and the pH value of the effluent from the resin column is 5.4. Next, the NaY slurry was taken out and filtered by suction, and the obtained primary exchange product was roasted at 600°C. After the roasting was completed, it was placed in T-1 again, and the resin was used for secondary exchange. After the first exchange, f...

Embodiment 2

[0034] The modification process adopted in this embodiment is: resin → first exchange → roasting → ammonium salt secondary → exchange roasting → product, and its specific operation process is as follows:

[0035] First, take 1000g of dry NaY particles, and configure it into a NaY slurry with a total volume of 7L in a beating container. The amount of resin in the resin column 3 is 2400ml. After the slurry is separated in the ceramic membrane, the obtained clear water enters the resin column and thickens the slurry. Enter the beating container, the resin column effluent also enters the beating container, the two react at an exchange temperature of 20°C for 10min, the pH value of the resin column effluent is 5.3, then take out the NaY slurry and filter it, and the obtained primary exchange product is roasted at 500°C for 1h After the roasting is completed, it is beaten with 3000ml deionized water to form a slurry, and the ammonium salt is used for direct contact with the secondary...

Embodiment 3

[0037] The modification process adopted in this embodiment is: primary ammonium salt exchange→roasting→resin secondary exchange→roasting→product, and its specific operation process is as follows:

[0038] First, weigh 1000g of dry NaY particles, make a slurry with 3000ml of deionized water, and conduct a direct contact exchange with ammonium salt. The amount of ammonium salt is 350g, the exchange temperature is 95°C, and the exchange time is 60min. Then, the product obtained from one exchange is suction-filtered and roasted at 650°C for 1.5h. After roasting, the NaY molecular sieve is configured into a NaY slurry with a total volume of 7L in the beating container 1. The resin volume in the resin column 3 is 3600ml. Separation, clear water 6 enters the resin column 3, the thick stock 5 enters the beating container 1, and the resin column effluent 7 also enters the beating container 1. The two react at an exchange temperature of 50 ° C for 30 minutes. The pH value of the resin co...

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Abstract

The invention relates to a method for modifying a molecular sieve. A ceramic membrane technique is applied to a molecular sieve modification process, so that the modification of an NaY molecular sieve by using a cation exchange resin is realized, direct contact of the NaY molecular sieve with the cation exchange resin is avoided and the regeneration difficulty of the resin is reduced. Non-direct contact exchange is adopted, so that raw material wastage of the molecular sieve because the molecular sieve is adhered to the resin when the molecular sieve is separated from the resin is avoided andthe regeneration difficulty of the resin is reduced; alternatively used ion exchange columns can regenerate the resin without separately taking the resin out, so that operation becomes convenient; and the solid and liquid separating property of the ceramic membrane technique is combined and ion diffusion in two-phase solution is accelerated by using a ceramic membrane, so that the modification reaction time between the NaY molecular sieve and the ion exchange resin is greatly shortened, the structure of an exchange product is kept well and the Na2O content of the NaY molecular sieve product is less than 1.0 weight percent.

Description

technical field [0001] The invention relates to a method for modifying a molecular sieve, in particular to a method for modifying a NaY molecular sieve by using a cation exchange resin. Background technique [0002] Molecular sieves are generally synthetic zeolites, which are aluminosilicate compounds with a cubic lattice, and their chemical composition is ξM 2 / n O·〔(Al 2 o 3 ) x (SiO 2 )y〕·zH 2 O, a hollow skeleton structure composed of silicon and aluminum connected by oxygen bridges. In the structure, there are many channels with uniform pore diameters and well-arranged holes with a large internal surface area. In addition, it also contains metal ions with low electricity price and large ionic radius and combined water. Therefore, molecular sieves have good selectivity and catalytic properties, making them widely used in various production and daily life, especially in the petrochemical field. As a catalyst for petroleum catalytic cracking, molecular sieves are unifo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
Inventor 李杨赵旭涛高雄厚刘发强王树勖马健维刘光利李晶蕊赵雪芹潘志爽
Owner PETROCHINA CO LTD