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Method for capturing CO2 in hydrophobic microchannel

A micro-channel, hydrophobic technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of insufficient mobility and large volume of absorption towers, and achieves favorable gas-liquid dispersion, heat and mass transfer. The effect of high speed and improved removal efficiency

Inactive Publication Date: 2014-06-18
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the absorption tower is bulky and the mobility is insufficient, especially it is inconvenient to apply it to the offshore floating LNG production system

Method used

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  • Method for capturing CO2 in hydrophobic microchannel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The absorbent and the mixed gas are simultaneously fed into the non-hydrophobic modified microchannel reactor to complete the CO 2 Absorption. The mass ratio of each component in the absorbent is sulfolane: diisopropanolamine: water is 2:2:1, and the mixed gas used is composed of CO 2 and N 2 Composed of CO 2 and N 2 The mole fractions are 50%, diisopropanolamine and CO 2 The molar ratio is 2.2, the volume flow rate of the mixed gas is 500Nml / min, the operating pressure is 5MPa, the operating temperature is 45°C, the hydraulic radius of the microchannel used is 500 microns, the contact angle with water is 60°, CO 2 After absorption, the absorption rate can reach 93%, among which, the system pressure drop is 1.5atm, and the gas-liquid contact area is 5500m 2 / m 3 .

Embodiment 2

[0025] The absorbent and the mixed gas are simultaneously fed into the non-hydrophobic modified microchannel reactor to complete the CO 2 Absorption. The mass ratio of each component in the absorbent is sulfolane: diisopropanolamine: water is 2:2:1, and the mixed gas used is composed of CO 2 and CH 4 Composed of CO 2 and CH 4 The mole fractions are 50%, diisopropanolamine and CO 2 The molar ratio of the gas mixture is 2.2, the volume flow rate of the mixed gas is 350Nml / min, the operating pressure is 5MPa, the operating temperature is 45°C, the hydraulic radius of the microchannel used is 500 microns, the contact angle with water is 60°, CO 2 After absorption, the absorption rate can reach 95%, among which, the system pressure drop is 1.2atm, and the gas-liquid contact area is 4000m 2 / m 3 .

Embodiment 3

[0027] The absorbent and the mixed gas are simultaneously fed into the non-hydrophobic modified microchannel reactor to complete the CO 2 Absorption. The mass ratio of each component in the absorbent is sulfolane: N-methyldiethanolamine: piperazine: water is 2:1.6:0.4:1, and the mixed gas used is composed of CO 2 and N 2 Composed of CO 2 The mole fraction of is 10%, and the rest is N 2 , N-methylglycolamine and CO 2 The molar ratio is 5.0, the volume flow rate of the mixed gas is 150Nml / min, the operating pressure is 3MPa, the operating temperature is 30°C, the hydraulic radius of the microchannel used is 400 microns, the contact angle with water is 70°, CO 2 After absorption, the absorption rate can reach 87%, among which, the system pressure drop is 0.7atm, and the gas-liquid contact area is 3500m 2 / m 3 .

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Abstract

The invention relates to a method for capturing CO2 in a hydrophobic microchannel. The surface tension of a used absorbent is lower, and thus a larger gas-liquid contact area is facilitated to be formed, and the CO2 absorption rate is increased; with the use of the hydrophobic microchannel, the process pressure drop is facilitated to be reduced. Compared with a conventional method, the method can obtain higher CO2 absorption rate while reducing energy consumption.

Description

technical field [0001] The invention relates to the field of gas separation and purification, in particular to a method for capturing CO in a hydrophobic microchannel 2 Methods. Background technique [0002] The use of coal and oil, etc. emits a large amount of CO 2 A large amount of CO also needs to be removed during the purification and use of natural gas 2 . Industrial CO 2 The capture mainly depends on the chemical absorption method, and the solvent used is mainly organic amine absorbent, such as monoethanolamine, diethanolamine, N-methyldiethanolamine / piperazine mixed amine, etc., and the equipment used is an absorption tower. However, the absorption tower is bulky and lacks mobility, especially inconvenient to apply it to the offshore floating LNG production system. [0003] Patent CN1887407A, according to different requirements of absorption pressure and purification degree, added different diaza ring compounds and hindered amines with different steric hindrance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCY02A50/20Y02C20/40
Inventor 陈光文叶春波焦凤君赵玉潮
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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