Method for synthesizing large-grain and highly-dispersed 4A zeolite

A synthetic method and highly dispersed technology, applied in the direction of crystalline aluminosilicate zeolite, A-type crystalline aluminosilicate zeolite, etc., can solve problems such as poor dispersion, affecting adsorption performance, irregular shape of powder, etc., and achieve crystal grain Uniform, large grain effect

Inactive Publication Date: 2012-06-20
江苏洁欧康科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When it is applied in the form of activated powder, it is affected by too small crystal grains and poor dispersion. Too small crystal grains have poor thermal stability, which is not suitable for high-temperature operation in the application process and affects its adsorption performance. However, the small crystal grains in the synthesis process will also form a large number of crystal grains to bond with each other, and the dispersion is not good, which affects the dispersion during use.
The most direct manifestation is: although the crystal grains are not large, the value of dv50 in the particle size distribution test is far greater than the grain size, making it difficult for manufacturers to accept
If the activated powder with bonding phenomenon is mechanically crushed, the crystal grains will be destroyed, making the powder irregular in shape, and also affecting its use effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of synthetic method of large grain, highly dispersed 4A zeolite, comprises the following steps:

[0038] (A) Raw material preparation; raw materials are sodium aluminate solution, sodium silicate solution, ionic membrane liquid caustic soda and water, and the ratio is based on molar ratio: the ratio of silicon oxide to aluminum oxide is 1.92, the ratio of sodium oxide to silicon oxide is 1.3, and the ratio of water to aluminum oxide is 1.3. The ratio to sodium oxide is 54;

[0039] (B) Gel forming; put the raw materials prepared in step (A) into the reaction kettle in the order of sodium aluminate, ionic membrane alkali, water, and sodium silicate, and stir well to mix them. The temperature of the mixture is controlled at 38~ 42°C, keep the temperature for 40 minutes to prepare the glue;

[0040] (C) Crystallization; the glue solution prepared in step (B) was heated to 72°C for dynamic crystallization for 2 hours under stirring, and then heated to 93°C for stati...

Embodiment 2

[0045] A kind of synthetic method of large grain, highly dispersed 4A zeolite, comprises the following steps:

[0046] (A) Raw material preparation; raw materials are sodium aluminate solution, sodium silicate solution, ionic membrane liquid caustic soda and water, and the ratio is based on molar ratio: the ratio of silicon oxide to aluminum oxide is 1.92, the ratio of sodium oxide to silicon oxide is 1.3, and the ratio of water to aluminum oxide is 1.3. The ratio to sodium oxide is 60, and the ratio of crystallization aid to alumina is 0.5;

[0047] (B) Gel forming; put the raw materials prepared in step (A) into the reaction kettle in the order of sodium aluminate, ion-exchange membrane alkali, water, sodium silicate, and crystallization aid, and stir well to mix them. The temperature of the mixture Control at 38~42°C, keep the temperature for 40 minutes to prepare glue;

[0048] (C) Crystallization; the glue solution prepared in step (B) was heated to 72°C for dynamic crys...

Embodiment 3

[0053] A kind of synthetic method of large grain, highly dispersed 4A zeolite, comprises the following steps:

[0054] (A) Raw material preparation; raw materials are sodium aluminate solution, sodium silicate solution, ionic membrane liquid caustic soda and water, and the ratio is based on molar ratio: the ratio of silicon oxide to aluminum oxide is 1.92, the ratio of sodium oxide to silicon oxide is 1.2, and the ratio of water The ratio to sodium oxide is 60, and the ratio of crystallization aid to alumina is 0.3;

[0055] (B) Gel forming; put the raw materials prepared in step (A) into the reaction kettle in the order of sodium aluminate, ion-exchange membrane alkali, water, sodium silicate, and crystallization aid, and stir well to mix them. The temperature of the mixture Control at 38~42°C, keep the temperature for 40 minutes to make glue;

[0056] (C) Crystallization; the glue solution prepared in step (B) was heated to 60°C for dynamic crystallization for 2 hours under...

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PUM

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Abstract

The invention discloses a method for synthesizing large-grain and highly-dispersed 4A zeolite. The method comprises the following steps of: preparing materials, gelatinizing, crystallizing, washing, and drying. In order to synthesize the large-grain and highly-dispersed 4A zeolite, a certain silicon-to-aluminum ratio is kept, a water-to-sodium ratio is properly increased, and a relatively low sodium-to-silicon ratio is controlled in the aspect of a raw material ratio; in order to ensure that grains are large and uniform, N-atom-containing organic alkali or an anionic surfactant is properly added into ingredients; in order to synthesize a 4A molecular sieve with large grains and high dispersibility, two-section crystallization is adopted, the first section is dynamic crystallization, the temperature is controlled to be between 70 and 85 DEG C to control the number of grain seeds and achieve a high dispersion degree among the seeds, and the second section is static crystallization to create conditions for grain growth only; and a certain amount of builder is added at the late stage of washing, so that the pH value of raw powder of the molecular sieve can be reduced, and bonded ions can be neutralized due to weak acidity and enter a solution to meet the requirement of dispersibility.

Description

technical field [0001] The invention relates to a method for synthesizing 4A zeolite in the chemical industry, in particular to a method for synthesizing large-grain and highly dispersed 4A zeolite. Background technique [0002] In addition to existing in nature, 4A zeolite is the oldest, most used and most mature artificial synthetic molecular sieve. Now the general 4A molecular sieve grains are between 1μm and 5μm. In addition to being replaced with 3A and 5A, it is also widely used in drying, coating and plastic modification. When it is applied in the form of activated powder, it is affected by too small crystal grains and poor dispersion. Too small crystal grains have poor thermal stability, which is not suitable for high-temperature operation in the application process and affects its adsorption performance. However, the small crystal grains in the synthesis process will also form a large number of crystal grains to bond with each other, and the dispersion is not good,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/16
Inventor 袁谋恒钟亚玲辜俊
Owner 江苏洁欧康科技有限公司
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