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Method for capturing carbon dioxide at low temperature by solid magnesium hydroxide

A technology of magnesium hydroxide and carbon dioxide, which is applied in chemical instruments and methods, separation methods, and separation of dispersed particles, can solve the problems of reaction equilibrium temperature, low conversion rate, and high reaction temperature, so as to improve chemical adsorption rate and facilitate The effect of recycling

Active Publication Date: 2014-06-04
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Relevant experimental research results prove that this method is feasible, but in order to solve the problem of low reaction rate of magnesium hydroxide carbonization, the reaction temperature is very high, the energy consumption is very large, and the conversion rate is not high due to the influence of the reaction equilibrium temperature

Method used

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  • Method for capturing carbon dioxide at low temperature by solid magnesium hydroxide
  • Method for capturing carbon dioxide at low temperature by solid magnesium hydroxide
  • Method for capturing carbon dioxide at low temperature by solid magnesium hydroxide

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Raw materials include: CO 2 (Linde Gas (Xiamen) Co., Ltd., purity > 99.9%, tetraheptyl ammonium bromide [THepAm] [Br] (Shanghai Merrill Chemical Technology Co., Ltd., purity > 99%), magnesium hydroxide (purity 100%) , water (using deionized water).

[0048] Mix magnesium hydroxide and tetraheptylammonium bromide with a mass ratio of 1:1 and send them into the high-pressure adsorber. After the high-pressure adsorber is heated to 50°C, the carbon dioxide delivery part is opened so that the carbon dioxide pressure is 15MPa and enters the high-pressure adsorber. The adsorber was used for chemical adsorption for 30min and 60min respectively. The adsorbent that has absorbed carbon dioxide is released from the high-pressure adsorber, and a small amount of product is taken for analysis and detection. The remaining product is washed with the same volume of water, the ionic liquid is washed into water, and the water is evaporated to recover the ionic liquid.

[0049] figure 2...

Embodiment 2

[0051]Raw materials include: CO 2 (Linde Gas (Xiamen) Co., Ltd., purity > 99.9%, tetraheptyl ammonium bromide [THepAm] [Br] (Shanghai Merrill Chemical Technology Co., Ltd., purity > 99%), magnesium hydroxide (purity 100%) , water (using deionized water).

[0052] Mix magnesium hydroxide and tetraheptylammonium bromide with a mass ratio of 2:1 and 4:1 and send them into the high-pressure adsorber, and open the carbon dioxide delivery part after the high-pressure adsorber is heated to 50°C, so that the carbon dioxide pressure is 15MPa , and enter the high-pressure adsorber for chemical adsorption for 60 minutes. The adsorbent that has absorbed carbon dioxide is released from the high-pressure adsorber, and a small amount of product is taken for analysis and detection. The remaining product is washed with the same volume of water, the ionic liquid is washed into water, and the water is evaporated to recover the ionic liquid.

[0053] Figure 4 and Figure 5 The XRD patterns o...

Embodiment 3

[0055] Raw materials include: CO 2 (Linde Gas (Xiamen) Co., Ltd., purity > 99.9%, tetraheptyl ammonium bromide [THepAm] [Br] (Shanghai Merrill Chemical Technology Co., Ltd., purity > 99%), magnesium hydroxide (purity 100%) , water (using deionized water).

[0056] Mix magnesium hydroxide and tetraheptylammonium bromide with a mass ratio of 1:1 into the high-pressure adsorber, and open the carbon dioxide delivery part after the high-pressure adsorber is heated to 50°C, and control the carbon dioxide pressure to 12MPa, 10MPa, 8MPa, 5MPa and into the high-pressure adsorber, chemical adsorption 60min. The adsorbent that has absorbed carbon dioxide is released from the high-pressure adsorber, and a small amount of product is taken for analysis and detection. The remaining product is washed with the same volume of water, the ionic liquid is washed into water, and the water is evaporated to recover the ionic liquid.

[0057] Figure 6-9 The XRD patterns of the reaction products of...

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Abstract

The invention provides a method for capturing carbon dioxide at a low temperature by solid magnesium hydroxide, relating to the capturing of the carbon dioxide. The method comprises the following steps: uniformly mixing magnesium hydroxide and ionic liquid; filling a high-pressure adsorption device; introducing the high-pressure carbon dioxide into the high-pressure adsorption device; carrying out chemical adsorption on the carbon dioxide by the magnesium hydroxide to capture the carbon dioxide; separating an adsorbent capturing the carbon dioxide from the ionic liquid; and recycling the ionic liquid. Under the lower temperature (less than 100 DEG C), the magnesium hydroxide is used for carrying out chemical adsorption on the carbon dioxide with the help of the ionic liquid; the temperature is much lower that in the prior art so that the method has the obvious energy consumption advantage; the ionic liquid is participated so that the chemical adsorption speed can be greatly increased; the adsorption conversion rate of the chemical adsorbent magnesium hydroxide can be up to 84% (80 DEG C, 15MPa and 1h) and no documents record that the adsorption conversion rate is reached; the ionic liquid can be conveniently and cyclically utilized and the method is a green chemical process.

Description

technical field [0001] The invention relates to the capture of carbon dioxide, in particular to a method for low-temperature capture of carbon dioxide by solid magnesium hydroxide. Background technique [0002] With the development of modern industry and the extensive use of automobiles, the emission of carbon dioxide is increasing day by day. At present, the increasing concentration of carbon dioxide in the atmosphere has caused a significant greenhouse effect and caused various climate changes. In order to cope with this situation, many countries and regions have started research on greenhouse gas emission reduction, and adopted certain technologies to capture and store carbon dioxide (CO2) in the exhaust gas. 2 Capture and storage (CCS for short) is currently internationally recognized as the most important "decarbonization" way to reduce greenhouse gas emissions. The existing carbon dioxide separation and capture technologies mainly include: chemical physical absorptio...

Claims

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Application Information

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IPC IPC(8): B01D53/82B01D53/62
CPCY02A50/20Y02C20/40Y02P20/151
Inventor 李军张晓立王立新王宏涛苏玉忠洪燕珍
Owner XIAMEN UNIV