ZSM-5 molecular sieve with small crystal grains and application thereof

A technology of ZSM-5 and molecular sieve, which is applied in the direction of molecular sieve catalyst, crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., to shorten the crystallization speed, shorten the crystallization time, and improve production efficiency Effect

Active Publication Date: 2010-06-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is that there are ZSM-5 molecular sieves with a silicon-aluminum molar ratio of less than 300 nanometers in the prior art. 2 / Al 2 o 3 All are less than 200, providing a new small grain ZSM-5 molecular sieve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 3.16 g of sodium aluminate (Al 2 O 3 52.0 wt%, Na 2 O3 5.8% by weight) was dissolved in 1000 grams of water, 25 grams of template agent tetrapropylammonium bromide and 20 grams of KOH were added under stirring conditions, and after complete dissolution, 804 grams of silica sol (SiO 2 40% by weight). After stirring for 2 hours, put it into a stainless steel reaction kettle with a stirring speed of 150 to 200 rev / min, crystallize at 110 °C for 6 hours, then heat up to 150 °C for crystallization for 15 hours, the obtained product is filtered, washed, and dried. X- The obtained crystal was measured by ray diffractometer as ZSM-5 with an average particle size of 250 nanometers, SiO 2 / Al 2 O 3 = 200.

Embodiment 2

[0019] Dissolve 2.29 grams of sodium aluminate in 1200 grams of water, add 9.2 grams of template agent tetrapropylammonium bromide and 20 grams of NaOH under stirring conditions, stir well, and after complete dissolution, add 800 grams of silica sol. After stirring for 2 hours, put it into a stainless steel reaction kettle with a stirring speed of 150-200 r / min, crystallize at 100 °C for 8 hours, and then heat up to 130 °C for 15 hours. The obtained product is filtered, washed and dried, and the obtained crystal is measured by X-ray diffractometer as ZSM-5, the average particle size is 300 nanometers, and the SiO 2 / Al 2 O 3 = 350.

Embodiment 3

[0021] In embodiment 2, improve the basicity of the system, increase the amount of template agent, according to the ratio of reactant materials (molar ratio) SiO 2 / Al 2 O 3 =600, OH - / SiO 2 =0.5, R / SiO 2 =0.05, H 2 O / SiO 2 =19.8, stir for 2 hours after batching, add ZSM-5 solid powder equivalent to 5% by weight of the raw material as crystal seed, continue to stir for 1 hour, put it into a stainless steel reaction kettle, stir at a speed of 150-200 rpm, and crystallize at 100°C. After 10 hours, the temperature was raised to 130°C for 20 hours of crystallization. The obtained product is filtered, washed and dried, and the obtained crystal is measured by X-ray diffractometer as ZSM-5, the average particle size is 300 nanometers, and the SiO 2 / Al 2 O 3 =500.

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Abstract

The invention relates to ZSM-5 molecular sieve with small crystal grains and application thereof, mainly solving the technical problems that the silica-alumina molar ratio (SiO2/Al2O3) of ZSM-5 molecular sieves with small crystal grains is less than 200, and the traditional ZSM-5 molecular sieves have poor catalyst stability and short service life when used for reaction for preparing propylene from methanol in the prior art. The invention well solves the problems by the technical scheme that the ZSM-5 molecular sieve with small crystal grains, which has a crystal diameter less than 300 microns and a SiO2/Al2O3 molar ratio not less than 200, is used for reaction for preparing the propylene from the methanol. The invention can be used in industrial production for preparing the propylene from the methanol.

Description

technical field [0001] The invention relates to a small crystal grain ZSM-5 molecular sieve and its application. Background technique [0002] ZSM-5 molecular sieve has become a very important shape-selective catalytic material due to its unique pore structure and good catalytic performance. It has been widely used in chemical process. In recent years, with the development of fine chemical industry, the narrow and long pore structure of molecular sieve materials severely limits the diffusion of reactants and products, making it difficult to meet the needs of macromolecular and liquid-phase reactions, and is prone to carbon deposition and short service life. increasingly prominent. Small-grain molecular sieves have small crystal grains and short channels, so the intra-crystalline diffusion resistance is small, which is conducive to the rapid entry and exit of reactant or product molecules into and out of the molecular sieve channels, which is very beneficial for reactions l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40C01B39/38C07C11/06C07C1/20
CPCY02P20/52
Inventor 任丽萍谢在库陈希强赵国良滕加伟
Owner CHINA PETROLEUM & CHEM CORP
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