Method for removing carbon dioxide in high-purity gas

A high-purity gas and carbon dioxide technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problem of high energy consumption and achieve the effect of no secondary pollution, good application prospects, and high-efficiency deep removal

Active Publication Date: 2022-05-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The purification method provided by this patent needs to be operated at low temperature and high pressure, which requires strict equipment and relatively high energy consumption

Method used

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  • Method for removing carbon dioxide in high-purity gas
  • Method for removing carbon dioxide in high-purity gas
  • Method for removing carbon dioxide in high-purity gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A high-efficiency deep adsorption removal of CO 2 The preparation method of the PEI-loaded adsorbent, the preparation of the PEI-loaded adsorbent comprises the following steps:

[0051] (1) 1g PEI was dissolved in 20mL methanol, stirred for 60min to obtain PEI / methanol solution;

[0052] (2) adding the pre-vacuum-dried SBA-15 to the PEI / methanol solution of step (1) according to the required amount, and continue to stir to form a slurry mixture, and stir at room temperature for 5h;

[0053] (3) The material obtained in step 2 is continuously purged under a nitrogen flow (50 mL / min) atmosphere at 45° C. until the sample forms a dry powder to obtain a PEI-loaded adsorbent, wherein the mass ratio of PEI in the PEI-loaded adsorbent is is 30%, then the PEI-loaded adsorbent is sealed for preservation or the test material is adsorbed to remove CO 2 performance.

Embodiment 2

[0055] A high-efficiency deep adsorption removal of CO 2 The preparation method of the PEI-loaded adsorbent, the preparation of the adsorbent material comprises the following steps:

[0056] (1) 1g PEI was dissolved in 20mL methanol, stirred for 60min to obtain PEI / methanol solution;

[0057] (2) adding the pre-vacuum-dried PS powder to the PEI / methanol solution of step (1) according to the required amount, and continue to stir to form a slurry mixture, and stir at room temperature for 5h;

[0058] (3) The material obtained in step 2 is continuously purged under a nitrogen flow (50 mL / min) atmosphere at 45° C. until the sample forms a dry powder to obtain a PEI-loaded adsorbent, wherein the mass ratio of PEI in the PEI-loaded adsorbent is is 30%, then the PEI-loaded adsorbent is sealed for preservation or the test material is adsorbed to remove CO 2 performance.

Embodiment 3

[0060] A high-efficiency deep adsorption removal of CO 2 The preparation method of the PEI-loaded adsorbent, the preparation of the adsorbent material comprises the following steps:

[0061] (1) 1g PEI was dissolved in 20mL methanol, stirred for 60min to obtain PEI / methanol solution;

[0062] (2) adding the preliminarily 108 ℃ vacuum-dried silica gel (SG) to the PEI / methanol solution in step (1) according to the required amount, and continue to stir to form a slurry mixture, and stir at room temperature for 5h;

[0063] (3) The material obtained in step 2 is continuously purged under a nitrogen flow (50 mL / min) atmosphere at 45° C. until the sample forms a dry powder to obtain a PEI-loaded adsorbent, wherein the mass ratio of PEI in the PEI-loaded adsorbent is is 20%, then the PEI-loaded adsorbent is sealed for preservation or the test material is adsorbed to remove CO 2 performance.

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Abstract

The invention discloses a method for removing carbon dioxide in high-purity gas. The method comprises the following steps: a high-purity gas raw material is introduced into a polyethyleneimine-loaded adsorbent for adsorption and removal of carbon dioxide, the dosage ratio of the high-purity gas raw material to the polyethyleneimine-loaded adsorbent is that 0.025-1.0 g/h of the high-purity gas raw material is introduced into each gram of the polyethyleneimine-loaded adsorbent, and the high-purity gas raw material comprises CO2 and target gas; the mass ratio of the CO2 to the high-purity gas raw material is 10-1000 ppm, the mass ratio of the target gas to the high-purity gas raw material is 99%-99.99%, the polyethyleneimine loaded adsorbent comprises a carrier and polyethyleneimine loaded on the carrier, and the polyethyleneimine accounts for 10-50% of the mass of the polyethyleneimine loaded adsorbent. The polyethyleneimine loaded adsorbent has relatively high selectivity and adsorption capacity on CO2, can remove CO2 gas to 0.5 ppm or below, realizes efficient and deep removal of CO2 impurities, and obtains 99.9999% high-purity gas.

Description

technical field [0001] The invention belongs to the technical field of high-purity gas preparation, and particularly relates to a method for removing carbon dioxide from high-purity gas. [0002] technical background [0003] With the development and progress of society and the upgrading of industrial technology, special gases are widely used in the fields of high-voltage insulation, refrigeration, and semiconductor manufacturing. For example, in semiconductor manufacturing processes, they can be used for gas etching; and CO 2 and other impurities, some with a concentration of only 1 × 10 -6 Volume ratio (ie ppm) level, but these impurities enter the process can lead to the decline of product quality and increase the defective rate of products. In recent years, higher requirements have been placed on the impurity content of carbon dioxide in high-purity gases (<10 -6 , V / V), and put forward the development requirements of "ultra-pure, ultra-clean and advanced". In the fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/04B01J20/10B01J20/16B01J20/26B01J20/30B01J20/28
CPCB01D53/0407B01J20/261B01J20/103B01J20/16B01D53/0454B01J20/28054B01D2257/50B01D2253/202B01D2253/106B01D2253/108B01D2253/116Y02P20/151Y02C20/40
Inventor 肖静罗家柱唐敏彭俊洁王维龙廖能
Owner SOUTH CHINA UNIV OF TECH
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