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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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent US20100024645 mainly emphasizes energy utilization, but cannot strengthen the desorption process of the absorption liquid

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

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

[0037] Under the condition of system pressurization (P1, 0.1 ~ 1MPa), from the absorption of CO 2 Diethanolamine (DEA) aqueous solution (temperature T1, CO 2 / DEA mol ratio 0.32, absorbing liquid concentration 30% DEA) is transported into inner groove type microchannel reactor desorption unit 3 by pump 6, passes into high-pressure water vapor (T3 in inner groove type microchannel reactor heat exchange unit 4) , 100~180℃) to heat the inner groove type microchannel reactor 1, so that the temperature of the absorption liquid rises to the desorption temperature (T4, 90~160℃), and the carbon dioxide from the absorption liquid is completed in the microchannel of the inner groove structure. In the desorption, and at the outlet to form a desorption liquid and carbon dioxide mixed two-phase material. It has been determined that under the conditions of system pressure 0.1MPa, residence time 0.01 seconds, and deso...

example 2

[0039] Example 2: Regeneration of CO 2 Absorbent N-methyldiethanolamine (MDEA)

[0040] to absorb CO 2 MDEA (CO 2 / MDEA=0.40, absorbing solution concentration 40% MDEA) is the liquid to be desorbed, desorbed in the internal groove type microreactor described in example 1 and method. It has been determined that under the conditions of system pressure of 1MPa, residence time of 100 seconds, and desorption temperature of 90-160°C, CO 2 The precipitation rate is 40% to 100%.

example 3

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

[0042] to absorb CO 2 MDEA / PZ (CO 2 / MDEA=0.45, absorbing liquid concentration 35% MDEA+3%PZ) is the liquid to be desorbed, 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 has been determined that under the conditions of system pressure of 0.5MPa, residence time of 1 second, and desorption temperature of 90-160°C, CO 2 The precipitation rate is 50% to 100%.

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

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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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