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Modified loaded potassium carbonate absorbent and application thereof to carbon dioxide removal in impurity atmosphere

A potassium carbonate, load-type technology, applied in gas treatment, air quality improvement, chemical instruments and methods, etc., can solve the problems of reduced activity of absorbents, complex air components in closed cabins, etc., to achieve improved stability and renewable cycles The effect of high utilization rate and high removal efficiency

Inactive Publication Date: 2018-02-13
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the composition of air in closed cabins of submarines is complex, and there are various organic substances, inorganic gases, and metal aerosols. 2 and NO 2 Under the atmosphere of CO, the loaded potassium carbonate absorbent is used to remove CO 2 , which can remove the above-mentioned acid impurity gas at the same time, but the activity of the absorbent is significantly reduced

Method used

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  • Modified loaded potassium carbonate absorbent and application thereof to carbon dioxide removal in impurity atmosphere
  • Modified loaded potassium carbonate absorbent and application thereof to carbon dioxide removal in impurity atmosphere
  • Modified loaded potassium carbonate absorbent and application thereof to carbon dioxide removal in impurity atmosphere

Examples

Experimental program
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Effect test

Embodiment 1

[0061] In this embodiment, the method of water vapor pretreatment activation is used to modify the supported potassium carbonate absorbent K 2 CO 3 / AC to increase its 2 / NO 2 Decarburization activity and stability in acidic impurity atmosphere, specifically:

[0062] Take 5g of the loaded potassium carbonate absorbent K with a load of 15% 2 CO 3 / AC is placed in the reactor, the compressed air flows through the bubbling device at 500mL / min, and the water vapor with a temperature of 20℃ and a concentration of 2% flows into the reactor. The above-mentioned absorbent is pretreated and activated for 30 minutes to make the active group Min K 2 CO 3 Activated to stable K 2 CO 3 ·1.5H 2 O, the modified supported potassium carbonate absorbent is obtained. figure 1 It is a scanning electron micrograph of the loaded potassium carbonate absorbent in Example 1 of the present invention. figure 2 It is a scanning electron micrograph of the absorbent modified by water vapor pretreatment in Exam...

Embodiment 2

[0072] This embodiment combines the method of high-temperature steam regeneration and activation to increase the load-type potassium carbonate absorbent K 2 CO 3 / AC contains SO 2 / NO 2 Decarburization activity and stability in acidic impurity atmosphere, specifically:

[0073] Take 5g of the loaded potassium carbonate absorbent K with a load of 15% 2 CO 3 / AC is placed in the reactor, and the decarburization reaction is completed according to the water vapor pretreatment activation step in Example 1. The liquid water flows through the steam generator and generates water vapor with a temperature of 120°C through temperature control. It is mixed with compressed air (500mL / min) to form high-temperature steam with a concentration of 10%; the generated high-temperature steam is passed into the reactor to prevent carbonation. The modified absorbent is regenerated and activated for 30 minutes to make the carbonated product KHCO 3 Activated to stable K 2 CO 3 ·1.5H 2 O.

[0074] When the ...

Embodiment 3

[0077] In order to better illustrate the technical effect of the high-temperature steam regeneration activation method provided in Example 2, it is given that the absorbent after regeneration in an air atmosphere contains SO 2 / NO 2 The decarburization activity and stability under acidic impurity atmosphere, specifically:

[0078] Take 5g of the loaded potassium carbonate absorbent K with a load of 15% 2 CO 3 / AC is placed in the reactor, and the decarburization reaction is completed according to the water vapor pretreatment activation step in Example 1. Compressed air flows into the reactor at 500 mL / min, and the bed is heated to 120° C. at 10° C. / min, and then the bed temperature is maintained for 30 minutes to regenerate the carbonation absorbent. Then the reactor temperature was reduced to 20°C and the atmosphere was switched to 1.0% CO 2 , 2.0% H 2 O, 30ppm SO 2 And 20ppm NO 2 Carburize reaction.

[0079] Evaluation of decarburization effect: K regenerated under air atmosphere...

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Abstract

The invention provides a modified loaded potassium carbonate absorbent and the application thereof to carbon dioxide removal in an impurity atmosphere. The modified loaded potassium carbonate absorbent is obtained by performing water vapor pretreatment modification or alkaline substance addition modification on a loaded potassium carbonate absorbent; the loaded potassium carbonate absorbent uses potassium carbonate as an active component, and the loading amount of the potassium carbonate is 10-30wt%. According to the invention, after absorbent modification, decarburization deactivation of theloaded potassium carbonate absorbent in an atmosphere containing SO2 / NO2 acidic impurities can be slowed down or effectively inhibited, the utilization rate of the active component can be increased, the decarburization activity of the loaded potassium carbonate absorbent can be enhanced, and the stability of the absorbent can be improved; in addition, a method provided by the invention is simple and feasible, and is easy to operate and control in practical application.

Description

Technical field [0001] The invention belongs to the technical field of micro-environment air quality control, environmental pollution prevention and safety and health control, and in particular relates to a modified loaded potassium carbonate absorbent and its application for removing carbon dioxide in an impurity atmosphere, and specifically includes suppressing loaded potassium carbonate The absorbent removes low-concentration CO in a closed space under an impurity atmosphere 2 Method of inactivation. Background technique [0002] In the open atmosphere, carbon dioxide (CO 2 ) The concentration is generally maintained at 300-400ppm, which is usually not harmful to the human body. However, in closed working spaces such as mines, space stations, manned spacecraft, and submarines, due to restricted ventilation, CO produced by workers’ respiratory metabolism, mechanical equipment operation, and material oxidation and decomposition 2 Easy to accumulate; when CO 2 When the concentrat...

Claims

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Application Information

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IPC IPC(8): B01D53/81B01D53/62B01D53/96
CPCB01D53/62B01D53/81B01D53/96B01D2251/306B01D2251/604B01D2251/606B01D2251/80B01D2257/504Y02A50/20Y02C20/40
Inventor 陆守香郭亚飞林锦黎昌海
Owner UNIV OF SCI & TECH OF CHINA
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