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 time, shorten the crystallization speed, and the synthesis method is simple and easy line effect

Active Publication Date: 2012-08-01
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 grams of sodium aluminate (Al 2 o 3 52.0 wt%, Na 2 (25.8% by weight) was dissolved in 1000 grams of water, and 25 grams of templating agent tetrapropylammonium bromide, 20 grams of KOH were added under agitation, and after completely dissolving, 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 150-200 rpm, crystallize at 110°C for 6 hours, then raise the temperature to 150°C for 15 hours, and filter, wash, and dry the obtained product, X- The crystal obtained by ray diffractometer is ZSM-5, the average particle size is 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 templating agent tetrapropylammonium bromide and 20 grams of NaOH under stirring conditions, and stir thoroughly. After completely dissolving, add 800 grams of silica sol. After stirring for 2 hours, put it into a stainless steel reaction kettle, stir at a speed of 150-200 rpm, crystallize at 100°C for 8 hours, then raise the temperature to 130°C for 15 hours. The resulting product is filtered, washed, and dried, and the X-ray diffractometer records that the resulting crystal is ZSM-5, with an average particle size of 300 nanometers, SiO 2 / Al 2 o 3 =350.

Embodiment 3

[0021] In embodiment 2, improve the alkalinity of system, increase template consumption, according to reactant material ratio (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 a seed crystal, continue stirring for 1 hour, put it into a stainless steel reaction kettle, stir at a speed of 150 to 200 rpm, and crystallize at 100 ° C. After 10 hours of curing, the temperature was raised to 130°C for 20 hours of crystallization. The resulting product is filtered, washed, and dried, and the X-ray diffractometer records that the resulting crystal is ZSM-5, with an average particle size of 300 nanometers, 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-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 the 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 macromolecules and liquid phase reactions, and the disadvantages of easy carbon deposition and short service life are also increasingly prominent. Small-grained molecular sieves have small grains and short channels, so the intracrystalline diffusion resistance is small, which is conducive to the rapid entry and exit of reactant or product molecules into the pores of the molecular sieve, which is very beneficial to reaction...

Claims

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Application Information

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Patent Type & Authority Patents(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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