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A method for preparing small-grain naa molecular sieves by dry ball milling

A technology of dry ball milling and molecular sieve, applied in the direction of crystalline aluminosilicate zeolite, A-type crystalline aluminosilicate zeolite, etc., can solve the problems of large particle size range, environmental pollution, complex process, etc., and achieve product and environment-free Effects of pollution, low price, and simple process operation

Inactive Publication Date: 2016-02-10
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of templates or space-limiting agents in the preparation process of these chemical methods pollutes the environment, and there are also disadvantages such as complex processes, long cycle times, high costs, and large particle size ranges.

Method used

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  • A method for preparing small-grain naa molecular sieves by dry ball milling
  • A method for preparing small-grain naa molecular sieves by dry ball milling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Put 5 grams of NaA molecular sieve raw material with a median particle size of 3.70 μm, 60 grams of NaCl and 450 grams of grinding balls in a 500 mL ball mill jar, and grind for 5 hours at a ball mill speed of 400 r / min, take out the ground sample, add distilled water to remove the ground NaCl, then filtered and dried to obtain a small crystal NaA molecular sieve with a median particle size of 600nm. According to the QB / T1768-2003 standard method, the calcium ion exchange capacity of the prepared small-grain NaA molecular sieve was determined to be 353 mg / g.

Embodiment 2

[0024] Put 5 grams of NaA molecular sieve raw material with a median particle size of 3.70 μm, 50 grams of NaCl and 440 grams of grinding balls in a 500 mL ball mill jar, and grind for 4 hours at a ball mill speed of 430 r / min, take out the ground sample, add distilled water to remove the ground NaCl, then filtered and dried to obtain a small crystal NaA molecular sieve with a median particle size of 620nm. According to the QB / T1768-2003 standard method, the calcium ion exchange capacity of the prepared small-grain NaA molecular sieve was determined to be 346 mg / g.

Embodiment 3

[0026] Put 6 grams of NaA molecular sieve raw material with a median particle size of 3.70 μm, 66 grams of NaCl and 500 grams of grinding balls in a 500 mL ball mill jar, and grind for 4 hours at a ball mill speed of 350 r / min, take out the ground sample, add distilled water to remove the ground NaCl, then filtered and dried to obtain a small crystal NaA molecular sieve with a median particle size of 735nm. According to the QB / T1768-2003 standard method, the calcium ion exchange capacity of the prepared small-grain NaA molecular sieve was determined to be 318 mg / g.

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Abstract

The invention relates to a method for preparing a small-grain size NaA molecular sieve in a dry ball grinding way, and belongs to the technical field of preparation of molecular sieves. The method comprises the following step of grinding an industrially produced NaA molecular sieve to prepare the small-grain size NaA molecular sieve with median grain sizes of 200 to 1000nm under the conditions of mass ratio of a grinding aid which is NaCl or sucrose to the NaA molecular sieve being 4:1 to 20:1, ball-to-material ratio of 2:1 to 15:1, ball grinding rotating speed of 300 to 1000r / min and grinding time of 0.5 to 24 hours, wherein the calcium ion exchange capacity is 300 to 400mg / g. The method for preparing the small-grain size NaA molecular sieve is easy to operate, free of pollution to a product and the environment, low in cost and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of molecular sieve preparation, in particular to a method for preparing small-grain NaA molecular sieves by dry ball milling. Background technique [0002] Molecular sieves are widely used as catalysts, adsorbents, ion exchangers and new functional materials due to their large specific surface area, high hydrothermal stability, rich and uniform micropores, and adjustable surface properties. Small-grained molecular sieves refer to molecular sieves with a grain size of less than 1 μm. Compared with conventional molecular sieves, small-grained molecular sieves have more active centers; larger pore volume and porosity; short channels and low intracrystalline diffusion resistance, etc. advantage. These characteristics make small-grain molecular sieves gradually become a research hotspot. Therefore, the research on its preparation method has attracted much attention. Common methods for preparing small-grained m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/14
Inventor 杜庆洋王前徐会君齐晓勇
Owner SHANDONG UNIV OF TECH