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CO2 high-selectivity adsorbent as well as preparation method and adsorption test method thereof

A high-selectivity, adsorbent technology, applied in the field of molecular sieves, can solve the problems of unfavorable reuse, low selectivity, low purity, etc., and achieve the effect of abundant channels

Pending Publication Date: 2022-05-13
四川亚联氢能科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a CO 2 Highly selective adsorbent and its preparation method and adsorption test method to solve the problem of separating CO from mixed gases in the prior art 2 , the existing adsorbent for CO 2 The selectivity is not high, the adsorbed CO 2 The purity is not high, which is not conducive to the subsequent CO 2 The problem of reuse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment provides a CO 2 A method for the preparation of a highly selective adsorbent comprising CO 2 The preparation and molding of high-selectivity molecular sieves are two steps.

[0039] Among them, CO 2 The preparation of highly selective molecular sieve comprises steps:

[0040] S1: Take 300g of 0.2mol / L KCl solution and preheat to 30°C;

[0041]S2: Weigh 30 g of 4A molecular sieve, that is, the solid-to-liquid mass ratio of 4A molecular sieve to KCl solution is 1:10; among them, 4A molecular sieve was purchased from Nankai University, and the silicon-aluminum ratio is about 2.05.

[0042] S3: Add 30g of 4A molecular sieve weighed into the preheated KCl solution, and stir at 400 rpm at 30°C for ion exchange for 1 h;

[0043] S4: After ion exchange for 1 h, remove the solution by filtration, wash the molecular sieve with pure water or desalted water, and wash away the KCl and the exchanged Na in the molecular sieve + , to obtain the washed filter cake; ...

Embodiment 2

[0059] The difference between this embodiment and embodiment 1 is that in CO 2 In the preparation process of high-selectivity molecular sieve, the concentration of KCl solution used is 0.25mol / L, the solid-liquid mass ratio of 4A molecular sieve and KCl solution is 1:5; the time of ion exchange is 0.5h.

[0060] in CO 2 During the molding process of high-selectivity molecular sieve, the specifically weighed CO 2 69 parts of high-selectivity molecular sieve, 23 parts of pseudoboehmite, 2 parts of scallop powder, 2 parts of citric acid and 4 parts of nitric acid are mixed according to the mass ratio of water to powder 3:5. Then extrude and shape with extruder to obtain extrudate.

[0061] The extrudate was dried at 120 °C for 2 h, and then calcined at 400 °C for 4 h to obtain the final CO 2 highly selective adsorbent.

[0062] The CO 2 The test results of the adsorption capacity of highly selective adsorbents for each gas: for CO 2 The adsorption capacity of CO is 26.74 ml...

Embodiment 3

[0065] The difference between this embodiment and embodiment 1 is that in CO 2 During the preparation of high-selectivity molecular sieves, the solid-to-liquid mass ratio of 4A molecular sieves to KCl solution was 1:5.

[0066] in CO 2 During the molding process of high-selectivity molecular sieve, specific weighing of CO 2 69 parts of high-selectivity molecular sieve, 23 parts of pseudo-boehmite, 4 parts of safflower powder and 4 parts of nitric acid are mixed according to the mass ratio of water to powder 3:5. Then extrude and shape with extruder to obtain extrudate.

[0067] The extrudate was dried at 120 °C for 2 h, and then calcined at 550 °C for 4 h to obtain the final CO 2 highly selective adsorbent.

[0068] The CO 2 The test results of the adsorption capacity of highly selective adsorbents for each gas: for CO 2 The adsorption capacity of CO is 47.63 ml / g, the adsorption capacity of CO is 4.74 ml / g, and the adsorption capacity of CH 4 The adsorption capacity is...

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Abstract

The invention provides a CO2 high-selectivity adsorbent and a preparation method thereof. The preparation method comprises the following steps: stirring a 0.1-1 mol / L KCl solution and a 4A molecular sieve at the temperature of 20-50 DEG C at the rotating speed of 400-600 rpm, exchanging for 0.5-3 hours, filtering, washing and drying to obtain the CO2 high-selectivity molecular sieve. The molecular sieve is prepared into a CO2 high-selectivity adsorbent after being molded, has relatively high selectivity to CO2, has a relatively high adsorption separation ratio, can obtain CO2 with relatively high purity, and is convenient for subsequent recovery and reutilization of CO2. The invention also provides an adsorption test method for the adsorbent, and the adsorption test method can quickly and accurately measure the adsorption quantity of the adsorbent per unit mass to the test gas, so that the adsorption screening characteristics of the adsorbent can be known conveniently.

Description

technical field [0001] The invention relates to the technical field of molecular sieves in pressure swing adsorption technology, in particular to a CO 2 Highly selective adsorbent, its preparation method and adsorption test method. Background technique [0002] The carbon dioxide in the mixed gas such as biogas exists as an impurity, which is unfavorable to the purity of the product and needs to be removed. At present, there are mainly two types of separation and recovery of carbon dioxide in industry, dry method and wet method, including solvent absorption method and low temperature distillation. method, membrane separation method, and pressure swing adsorption method. Among them, the pressure swing adsorption method has the advantages of low cost, reusable adsorbent, almost no "three wastes", and no secondary pollution to the environment. It is considered to be the best method for separating CO from biogas 2 very appropriate method. Adsorbent is the foundation and key o...

Claims

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Application Information

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IPC IPC(8): B01J20/18B01J20/30B01D53/02G01N7/04
CPCB01J20/186G01N7/04B01D53/02B01D2257/504
Inventor 王业勤王春候严莎
Owner 四川亚联氢能科技股份有限公司
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