Solvent for eliminating CO2 from gas mixture

A technology for gas mixture and removal, applied in the fields of chemical separation, air quality improvement, chemical instruments and methods, etc.

Inactive Publication Date: 2007-01-03
HUAXI CHEM INST CHENGDU CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The other components are water

Method used

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  • Solvent for eliminating CO2 from gas mixture
  • Solvent for eliminating CO2 from gas mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A CO 2 Mixed gas, CO in the gas 2 The content is 26%, the temperature is normal temperature, the pressure: 0.7MPa, using such as figure 1 Two-stage absorption and two-stage regeneration process.

[0015] regeneration tower temperature

[0016] The running results show that in CO 2 Under the condition of partial pressure of only 0.18MPa, using this solution formula, the solution regeneration temperature is low, and CO can be partially removed without steam regeneration 2 , The purpose of adjusting the product structure, low energy consumption, large operating flexibility.

Embodiment 2

[0019] use as figure 2 The one stage absorption stage regeneration process flow shown.

[0020] project

unit

content

CO 2

mol%

<20ppm

N 2

mol%

0.25

CH 4

mol%

3.57

CO

mol%

29.94

H 2

mol%

65.98

h 2 o

mol%

0.26

flow

N m 3 / h

2.26

temperature

℃

40

pressure

MPaG

2.78

[0021] It can be seen from the production data that the CO in the gas can be purified by using this solution formula 2 The content can be reduced to a very low level, significantly lower than the conventional MDEA decarburization method.

[0022] attached figure 1 It is the two-stage absorption and two-stage regeneration process flow adopted in Example 1.

[0023] attached figure 2 It is the one-stage absorption and one-stage regeneration process flow adopted in Example 2.

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Abstract

The present invention is method of adding diazacyclo compound and organic amine with steric effect into N-methyl diethanolamine to obtain the activator for removing CO2 from gas mixture. The present invention provides two solution recipes. The recipe I for the solution suitable for removing CO2 from gas mixture of low operation pressure consists of N-methyl diethanolamine 30-50 wt%, substituted cyclopentyl dinitride 1-10 wt% and steric amine 1-5 wt%. The recipe II the solution suitable for removing CO2 from gas mixture of high operation pressure consists of N-methyl diethanolamine 30-60 wt%, cyclohexyl dinitride 1-8 wt% and steric amine 1-15 wt%.

Description

Technical field: [0001] The invention relates to a solvent formula for removing carbon dioxide from mixed gas, which belongs to the field of separation of natural gas and petrochemical gas. Background technique: [0002] The aqueous solution with N-methyldiethanolamine as the main body is widely used in the decarbonization process of industrial gases. It has the characteristics of large absorption capacity, low regeneration energy consumption, and no corrosion to equipment, so it has a good prospect for popularization and application. [0003] ZL 93110579.X invented three groups of solutions with different composition formulas: the solution formula suitable for sulfur-free gas is: N-methyldiethanolamine 20-60% by weight, piperazine 1-5% by weight, diethanolamine 1-10% by weight % by weight; there are two groups suitable for sulfur-containing gases: N-methyldiethanolamine 20-60% by weight, N-methyl-ethanolamine 0.1-10% by weight, diethanolamine 1-10% by weight; N-methyldietha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/62
CPCY02C10/06Y02C10/04Y02A50/20Y02C20/40
Inventor 汪志和肖九高王俊昌曾轲
Owner HUAXI CHEM INST CHENGDU CITY
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