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Method for adsorbing CO2 in gases

A CO2, gas technology, applied in the field of CO2 adsorption in gas, can solve the problems of low thermal stability, unsatisfactory CO2 removal degree, complicated preparation process of adsorbent, etc., achieving low cost, increased crystallinity, diffusion Low resistance effect

Active Publication Date: 2019-03-26
ZHEJIANG RES INST OF CHEM IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process of these adsorbents is cumbersome and their thermal stability is not high, so it is difficult to regenerate them by thermal desorption.
CO in the above patent 2 The degree of removal cannot meet the needs of actual production

Method used

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  • Method for adsorbing CO2 in gases
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  • Method for adsorbing CO2 in gases

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3 and comparative example 1-3

[0022] Embodiment 1-3 of the present invention all adopts the following method to low concentration CO in the gas 2 The adsorption process includes the following steps: fill 10g of adsorbent in the middle of a stainless steel tube with an inner diameter of 20mm and a length of 400mm, and fill the rest with ceramic sheets. -1 N 2 Activate in air for 5h, then lower the temperature to 25°C, under normal pressure, take 100h -1 Space velocity, from the top of the adsorption fixed bed into the low concentration of CO containing 1000ppmv 2 The gas after adsorption is analyzed by gas chromatography with a helium ion detector for CO 2 content until the adsorption reaches saturation. CO 2 When the content reaches 1ppmv, it is the breakthrough point, and the adsorption effect of the adsorbent on CO 2 breakthrough adsorption capacity and saturated adsorption capacity.

[0023] The other conditions of Comparative Examples 1-3 are the same as those of Examples 1-3, except that the ads...

Embodiment 4-7

[0028] The other conditions of Examples 4-7 are the same as those of Examples 1-3, except that the adsorbent is changed to LiZSM-5 molecular sieve, and the adsorption temperatures are 5°C, 25°C, 50°C and 75°C respectively. The results are shown in Table 2.

[0029] Table 2 Adsorption temperature of CO adsorption on LiZSM-5 molecular sieve 2 performance impact

[0030]

[0031] It can be seen from Examples 4-7 that with the increase of adsorption temperature, CO 2 breakthrough adsorption capacity and CO 2 The saturation adsorption capacity was significantly reduced, so it can be seen that the increase of adsorption temperature greatly reduces the CO 2 breakthrough adsorption capacity and CO 2 Saturated adsorption capacity is not conducive to the maximization of the adsorption performance of the adsorbent. It can be seen from Examples 4-7 that when the adsorption temperature in Example 4 is 5 °C, CO 2 breakthrough adsorption capacity and CO 2 The saturated adsorption cap...

Embodiment 8-10

[0033] Other conditions of embodiment 8-10 are the same as embodiment 1-3, only the adsorbent is changed to LiZSM-5 molecular sieve, N 2 / CO 2 Mixed gas feed space velocity is 100h -1 , 400h -1 ,600h -1 , the results are shown in Table 3.

[0034] Table 3 Feed space velocity on CO adsorption by LiZSM-5 molecular sieve 2 performance impact

[0035]

[0036] As can be seen from Examples 8-10, with N 2 / CO 2 The increase of the mixed gas feed space velocity, CO 2 breakthrough adsorption capacity and CO 2 The saturated adsorption capacity decreases accordingly, and in Example 8, N 2 / CO 2 The mixed gas feed space velocity is 100 -1 , when CO 2 The breakthrough adsorption capacity and CO2 saturation adsorption capacity are the largest, and LiZSM-5 molecular sieve adsorbs CO 2 The best performance, the injection space velocity is too fast will cause CO 2 The contact time with the molecular sieve is reduced, thereby reducing the adsorption efficiency and quality, and...

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Abstract

The invention provides a method for adsorbing CO2 in gases. The adsorbing method comprises the following steps: taking an alkali metal ion modified ZSM-5 molecular sieve as an adsorbent, and adsorbingelectronic gases of low-concentration CO2 gases, wherein the concentration of CO2 in the electronic gases is 100-1000ppmv. According to the alkali metal ion modification, base sites can be included in the ZSM-5 molecular sieve, and due to acid-base interactions, the low-concentration CO2 in the high-purity gas is efficiently adsorbed, and the CO2 impurity concentration in the high-purity gas is lower than 0.01ppmv; and meanwhile, the adsorption method disclosed by the invention is environmental-friendly, low in operating cost, high in heat stability of the adsorbent and high in hydrophobic property, namely excellent water resistance.

Description

technical field [0001] The invention relates to the field of carbon dioxide adsorption and removal, in particular to a CO 2 the adsorption method. Background technique [0002] CO 2 It is an impurity that needs to be removed during the preparation of many high-purity gases. [0003] Currently, for the separation and removal of CO 2 Commonly used techniques include cryogenic distillation, absorption, membrane separation, and solid adsorption. Among them, the solid adsorption method has the characteristics of simple process, low corrosion to equipment, and low energy consumption for adsorbent recovery and regeneration. 2 main method. [0004] At present, low-concentration CO at home and abroad 2 The research on adsorbents mainly focuses on amine-based modified porous solid materials, and amine-based materials (PEI, TETA and TEPA, etc.) are coated on porous solid materials by impregnation, grafting and copolymerization. Chinese patent CN103657610A discloses a porous poly...

Claims

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Application Information

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IPC IPC(8): B01J20/18B01J20/30B01D53/02
CPCB01D53/02B01D2257/504B01J20/046B01J20/186Y02C20/10Y02C20/40
Inventor 张波白占旗丁元胜周金兵杜肖宾张金柯缪光武卢永康金佳敏何双财胡欣
Owner ZHEJIANG RES INST OF CHEM IND CO LTD
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