Reinforced desorption method of acidic gas

A technology for desorption of acidic gases, applied in chemical instruments and methods, separation methods, air quality improvement, etc., can solve the problems of inability to strengthen the desorption process of the absorption liquid, and achieve the effects of reduced energy consumption, easy control, and efficient removal

Inactive Publication Date: 2016-07-13
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

Patent US20100024645 mainly emphasizes energy utilization, but c

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  • Reinforced desorption method of acidic gas
  • Reinforced desorption method of acidic gas
  • Reinforced desorption method of acidic gas

Examples

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Example Embodiment

[0036] Example 1: Regenerating CO 2 Absorbent Diethanolamine (DEA)

[0037] Under the system pressurization condition (P1, 0.1~1MPa), it can absorb CO from 2 Diethanolamine (DEA) aqueous solution (temperature T1, CO 2 / DEA molar ratio 0.32, absorption solution concentration 30% DEA) is transported by pump 6 into the desorption unit 3 of the inner groove type microchannel reactor, and high pressure steam (T3) is introduced into the heat exchange unit 4 of the inner groove type microchannel reactor ,100~180℃) Heat the inner groove type microchannel reactor 1 to raise the temperature of the absorption liquid to the desorption temperature (T4, 90~160℃), and complete the carbon dioxide from the absorption liquid in the microchannel with the inner groove structure In the desorption, a two-phase mixture of desorption liquid and carbon dioxide is formed at the outlet. It is determined that CO under the system pressure of 0.1MPa, residence time of 0.01 seconds, and desorption temperature ...

Example Embodiment

[0039] Example 2: Regenerating CO 2 Absorbent solution N-methyldiethanolamine (MDEA)

[0040] To absorb CO 2 MDEA (CO 2 / MDEA=0.40, absorption solution concentration 40% (MDEA) is the liquid to be desorbed, which is desorbed in the internal groove type microreactor and method described in Example 1. It is determined that CO under the system pressure of 1MPa, residence time of 100 seconds, and desorption temperature of 90~160℃ 2 The precipitation rate is 40% to 100%.

Example Embodiment

[0041] Example 3: Regenerating CO 2 Composite absorption liquid methyldiethanolamine MDEA / piperazine PZ

[0042] To absorb CO 2 MDEA / PZ(CO 2 / MDEA=0.45, the concentration of the absorption solution is 35% MDEA+3% PZ) is the solution to be desorbed, which is desorbed in the method described in Example 1. The width w of the inner groove structure is 50 microns, the depth d is 500 microns, and the height is 1000 microns. The distance l between two adjacent inner groove structures is 5 mm. The channel equivalent diameter is 750 microns, and the channel shape is rectangular. It is determined that CO under the system pressure of 0.5MPa, residence time of 1 second and desorption temperature of 90~160℃ 2 The precipitation rate is 50% to 100%.

[0043] It should be noted that the acid gas enhanced desorption method of the present invention can change the temperature, flow rate, and residence time in the internal groove microchannel reactor according to actual conditions, such as the type o...

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Abstract

The invention provides a reinforced desorption method of an acidic gas. The method is characterized in that inner groove-shaped micro-channels are introduced to a micro-channel reactor, and desorption process reinforcement of a carbon dioxide absorption liquid is carried out under 0.1-1MPa at 90-160DEG C for 0.01-100s. The micro-reactor comprises a plate heat exchange unit and a plate desorption unit, and the plate desorption unit is formed by the parallel inner groove-shaped micro-channels. The method can realize carbon dioxide desorption in an extremely short time, prevent absorbent overheating and reduce the volume of evaporated water, and has a small size in order to greatly reduce the energy and material consumption in the desorption process of the carbon dioxide absorption liquid and the occupied area. The energy consumption, the material consumption and the occupied area of the reinforced desorption method are respectively 20% or above lower than those of traditional tower desorption systems.

Description

technical field [0001] The invention relates to an intensified desorption method of acid gas, in particular to a microchannel reactor technology capable of intensifying the desorption process of acid gas absorption liquid and reducing energy consumption in the desorption process. The method can be used for regeneration of acid gas absorbing liquids such as flue gas, synthetic ammonia and natural gas chemical industry. Background technique [0002] Industrial removal of CO 2 Etc acid gas is an important process. A large amount of CO is contained in industrial gases such as flue gas, synthetic ammonia (with natural gas as raw material) and natural gas chemical industry 2 、H 2 S and other acid gases, the removal of acid gases in industrial gases is a necessary link to purify raw materials, prevent equipment corrosion, blockage and protect the environment. [0003] At present, most of the industrial acid gas removal processes are to use physical or chemical absorbents to abs...

Claims

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Application Information

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IPC IPC(8): B01D53/14B01D53/78B01D53/40B01J19/00
CPCY02A50/20Y02C20/40
Inventor 陈光文刘宏臣赵玉潮
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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