Preparation method of high-efficiency desorption air separation molecular sieve

A molecular sieve and desorption technology, applied in the field of molecular sieve, can solve problems such as difficulty in meeting technical requirements

Active Publication Date: 2018-08-17
江西科帕克环保化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the molecular sieve produced by the current 13X raw powder, the static water adsorption is only about 27%, and the CO 2 The adsorption capacity is about 18% (25°C), and the bulk density is about 0.64g / ml. This desorption technical index is difficult to meet the technical requirements of the modern air separation field.

Method used

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  • Preparation method of high-efficiency desorption air separation molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Follow the steps below to prepare highly efficient desorption air separation molecular sieves:

[0019] 1) Molecular sieve raw powder leaching: add artificially synthesized zeolite powder into a sodium carbonate solution with a concentration of 35-45% by mass, undergo hydrothermal crystallization at 150°C for 200 minutes, and obtain molecular sieve raw powder;

[0020] 2) Dry the molecular sieve raw powder prepared in step 1) at 180°C until the water content is below 20% by weight, mix it with kaolin, attapulgite, foreign crucible, and bayberry extract, and then grind it to 325 mesh After the above, carry out granulation or extrusion molding to obtain a molecular sieve body; wherein the weight percentage of each raw material component is: molecular sieve raw powder 40kg; kaolin 10kg; attapulgite 10kg; foreign crucible 10kg; bayberry extract 30kg.

[0021] 3) Dry the molecular sieve body prepared in step 2) and place it in a rotary furnace for 80-90 minutes under the pro...

Embodiment 2

[0023] Follow the steps below to prepare highly efficient desorption air separation molecular sieves:

[0024] 1) Molecular sieve raw powder leaching: add zeolite powder into a sodium silicate solution with a concentration of 35% by mass, undergo hydrothermal crystallization at 150°C for 200 minutes, and obtain molecular sieve raw powder;

[0025] 2) Dry the molecular sieve raw powder prepared in step 1) at 160°C until the water content is 18% by weight, mix it with kaolin, attapulgite, bayberry extract, and sodium carboxymethyl cellulose, and then grind After reaching 325 mesh or more, carry out granulation or extrusion molding to obtain a molecular sieve green body; wherein the weight percentage of each raw material component is: molecular sieve raw powder 40kg; kaolin 10kg; attapulgite 20kg; bayberry extract 20kg; carboxymethyl cellulose Sodium 10kg.

[0026] 3) Dry the molecular sieve body prepared in step 2) and place it in a rotary furnace for 90 minutes under the prote...

Embodiment 3

[0028] Follow the steps below to prepare highly efficient desorption air separation molecular sieves:

[0029] 1) Molecular sieve raw powder leaching: add zeolite powder into a sodium bicarbonate solution with a concentration of 45% by mass, undergo hydrothermal crystallization at 160°C for 160 minutes, and obtain molecular sieve raw powder;

[0030] 2) Dry the molecular sieve raw powder prepared in step 1) at 160°C until the water content is less than 20% by weight, mix it with attapulgite and bayberry extract, and then grind to 325 mesh or more before granulating Or extrusion molding to obtain a molecular sieve body; wherein the weight percentage of each raw material component is: molecular sieve raw powder 40kg; attapulgite 30kg; red bayberry extract 30kg.

[0031] 3) Dry the molecular sieve body prepared in step 2) and place it in a rotary furnace for 90 minutes under the protection of nitrogen to obtain an air separation molecular sieve with high-efficiency desorption. Th...

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Abstract

The invention discloses a preparation method of an air separation molecular sieve capable of efficiently desorbing. The method comprises the following concrete steps: (1) leaching molecular sieve raw powder; (2) dehumidifying the molecular sieve raw powder prepared in the step (1) at the temperature of 160-180 DEG C, evenly mixing the dehumidified molecular sieve raw powder with modified raw material powder and an auxiliary agent, then grinding and granulating to obtain a molecular sieve green body; (3) roasting the molecular sieve green body under the protection of nitrogen to obtain the air separation molecular sieve capable of efficiently desorbing. The air separation molecular sieve has good desorption performance and can meet the requirements of the field of modern air separation.

Description

technical field [0001] The invention relates to the technical field of molecular sieves, in particular to a preparation method of highly efficient desorption air separation molecular sieves. Background technique [0002] In the modern air separation field of efficient adsorption separation, purification and environmental protection, more and more attention is paid to the application effect of molecular sieves. The adsorption channel of the special molecular sieve for air separation uses X-type artificially synthesized zeolite powder as the main raw material, and the molecular sieve synthesized is based on the ratio of silicon to aluminum to establish the desorption energy of the molecular sieve. [0003] The molecular sieves currently used in the field of air separation are all made of domestically produced 13X raw powder. The raw powder indicators of general molecular sieves are: static water adsorption 32.5%, CO 2 The adsorption capacity is 23%, the pH value is 9-11, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/18B01J20/30B01D53/02
CPCB01D53/02B01J20/048B01J20/12B01J20/186B01J2220/42B01J2220/4806B01J2220/4825
Inventor 易中发黄德金
Owner 江西科帕克环保化工有限责任公司
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