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Method for separating carbon dioxide dissolvent from gas mixture

A technology of gas mixture and carbon dioxide, which is applied in the direction of carbon compounds, separation methods, and dispersed particle separation, can solve the problems of high energy consumption and unsatisfactory purification degree, and achieve the effects of low energy consumption, reduced corrosion, and large absorption capacity

Active Publication Date: 2004-11-17
SINOPEC NANJING RES INST OF CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the partial pressure of carbon dioxide in the gas is 0.1Mpa ~ 0.25Mpa (such as the pressure of the shift gas in the ammonia industry ~ ), there is no suitable decarburization method at present. If the monoethanolamine method is used, the energy consumption is too high; the improved MDEA method cannot meet the requirement of purification degree

Method used

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  • Method for separating carbon dioxide dissolvent from gas mixture

Examples

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Comparison scheme
Effect test

Embodiment 1

[0029] The raw material gas is the shift gas from a medium-sized nitrogen fertilizer plant, in which the carbon dioxide content is about 26%. After cooling to room temperature and depressurizing to 0.8Mpa, the attached figure 1 The shown process removes carbon dioxide, and the regeneration energy of all solutions is the same, and the absorption effects of different solutions are shown in Table 1.

[0030] Preface

[0031] As can be seen from Table 1: compared with the activated MDEA solution, the solvent used in the present invention can reduce the carbon dioxide content in the purified gas to below 1% under the lower partial pressure of carbon dioxide.

Embodiment 2

[0033] The gas condition is the same as that of Example 1, but the regeneration power is changed, and the results are shown in Table 2.

[0034] Preface

[0035] As can be seen from Table 1: compared with the MEA method, the required regeneration energy consumption of the solvent used in the present invention is much lower.

Embodiment 3

[0037] Attached figure 1 In the process shown, the composition of the solution is: MDEA25% + TBDEA4% + AMP5% + TBMEA5% + MMEA3% + water 58%, the pressure of the shift gas is 0.8Mpa, which contains 22% of carbon dioxide, and the flow rate is 17000Nm 3 / h, the carbon dioxide in the purified gas is 0.5%.

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Abstract

The invention belongs to gas separation field, which proposes a method for eliminating carbon dioxide from gas with compound ammonia liquid. It uses a kind of compound ammonia liquid as the absorbent, the whole ammonia density in the absorbent accounts for 20%-60% according to the weight percentage. When the partial pressure of carbon dioxide in the gas is 0.1MPa-0.25Mpa, the absorbing content is large; the purification is high, and energy-saving.

Description

Technical field: [0001] The invention belongs to the field of gas separation, and in particular relates to a method for separating carbon dioxide from a gas mixture containing carbon dioxide by using a composite amine solvent. Background technique: [0002] In the chemical industry and gas processing processes, it is often necessary to remove carbon dioxide from various gases. The main method of removing carbon dioxide from gas is to use alcohol amine solution as absorbent, such as: when the partial pressure of carbon dioxide in the gas is less than 0.1Mpa, usually monoethanolamine (MEA) and various improved monoethanolamine methods are used; when carbon dioxide in the gas When the partial pressure is greater than 0.3Mpa, N-methyldiethanolamine (MDEA) and various improved MDEA methods such as the aMDEA series of BASF and those developed by Dow Chemical are usually used. series etc. These methods have achieved good results. However, when the partial pressure of carbon dio...

Claims

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Application Information

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IPC IPC(8): B01D53/14C01B32/50
CPCY02C10/06Y02A50/20Y02C20/40Y02P20/151
Inventor 毛松柏朱道平叶宁丁雅萍黄晓燕
Owner SINOPEC NANJING RES INST OF CHEM IND CO LTD
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