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CO2 trapping method combining dimethyl carbonate absorption and membrane desorption

A dimethyl carbonate and desorption technology, applied in the field of chemical engineering, can solve problems such as increased equipment investment, large equipment investment, and long process flow, and achieve the effects of reduced equipment investment, reduced energy consumption, and low solvent prices

Inactive Publication Date: 2012-05-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nitrogen stripping is used in the regeneration process of the absorbent. On the one hand, the use of nitrogen increases the cost, and on the other hand, it is necessary to add a tail gas purification tower to recover the dimethyl carbonate in the desorbed gas. The equipment investment increases. For this process Due to the shortcomings and defects of long process, high cost, and large equipment investment, a CO 2 capture methods to further simplify the process and reduce costs

Method used

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  • CO2 trapping method combining dimethyl carbonate absorption and membrane desorption
  • CO2 trapping method combining dimethyl carbonate absorption and membrane desorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Contains CO 2 The mixed gas composition (mol fraction) is as follows:

[0035] CO 2 is 0.4210; H 2is 0.5235; DMCARB is 0; CO is 0.0141;

[0036] Ar is 6.8000E-03; METHANE is 8.7000E-03; N 2 is 0.0254;

[0037] h 2 S is 4.60000E-04; H 2 O is 0,

[0038] The temperature of the mixed gas is 28°C and the pressure is 2.6MPa;

[0039] Mixed gas and absorption tower top to remove CO 2 After heat exchange, the purified gas drops to 23.2°C and enters the absorption tower from the lower part. The dimethyl carbonate from the absorbent storage tank at 25°C exchanges heat with the liquid phase of the secondary desorption tank and enters the absorption tower from the upper part after reaching 14.3°C. Two-phase Countercurrent contact and absorption mass transfer occur in the column. The gas phase flow rate is 22121KG-MOL / HR, and the liquid phase flow rate is 54323KG-MOL / HR. The temperature at the top of the absorption tower is 15.5°C and the pressure is 2.55MPa; the tempera...

Embodiment 2

[0047] Contains CO 2 The mixed gas has a temperature of 27°C and a pressure of 2.9MPa. The composition (mol fraction) is as follows:

[0048] CO 2 : 0.4210; H 2 :0.5235:DMCARB:0;CO:0.0141;

[0049] Ar: 6.8000E-03; METHANE: 8.7000E-03: N 2 : 0.0254;

[0050] h 2 S: 4.60000E-04; H 2 O: 0;

[0051] Mixed gas and absorption tower top to remove CO 2 After heat exchange, the purified gas drops to 23.1°C and enters the absorption tower from the lower part. The dimethyl carbonate from the absorbent storage tank at 25°C exchanges heat with the liquid phase of the secondary desorption tank and enters the absorption tower from the upper part after reaching 15.1°C. Two-phase Countercurrent contact and absorption mass transfer occur in the column. The gas phase flow rate is 22117KG-MOL / HR, and the liquid phase flow rate is 58611KG-MOL / HR. The temperature at the top of the absorption tower is 15.8°C and the pressure is 2980KPa; the temperature at the bottom of the tower is 29.2°C ...

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PUM

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Abstract

The invention discloses a CO2 trapping method combining dimethyl carbonate absorption and membrane desorption, belonging to the technical field of chemical engineering. The method comprises the following steps of: decarbonizing feed gas containing CO2 by dimethyl carbonate absorption; then carrying out two-stage throttling expansion and membrane desorption regeneration on CO2-absorbed absorbent rich liquor, and discharging CO2 gas generated by the throttling expansion and the membrane desorption out of the battery limit. Compared with a decarbonizing process of the inventor, which adopts the dimethyl carbonate as the absorbent, the new process of the dimethyl carbonate decarburization and the membrane desorption can reduce the comprehensive energy consumption by 5-20 percent. Compared with the propylene carbonate method maturely applied in industry at present, the energy consumption can be reduced by 30-40 percent; compared with the polyethylene glycol dimethyl ether method, the priceof a solvent is lower, and polymerization losses are reduced by 40-60 percent; and compared with the low-temperature methane swabbing process, the operating temperature is milder, and the equipment investment is reduced by 30-40 percent. The CO2 removing efficiency can reach 95 percent or above.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering. Especially related to the absorption and removal of CO from the medium and high pressure mixed gas of synthesis gas, shift gas and IGCC gas 2 A CO2 that combines dimethyl carbonate absorption and membrane desorption 2 capture method. Background technique [0002] Global warming has become an undisputed fact. Greenhouse gas CO 2 emissions are a major contributor to climate warming. from rich CO 2 Capture and separation of CO in the gas mixture of synthetic gas, shift gas and IGCC gas 2 It is an important measure to deal with global warming. [0003] According to different applications and the pressure of raw gas, CO removal 2 Methods can be divided into dry method and wet method. Dry methods include adsorption methods and membrane methods, and are generally applicable to CO 2 Where the concentration is low; the wet method can be divided into chemical absorption method and ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/20B01D53/14C01B32/50
CPCY02C10/06Y02C20/40Y02P20/151
Inventor 费维扬汤志刚姜忠义骆广生陈健余立新
Owner TSINGHUA UNIV
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