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Improved N-methyldiethanolamine decarbonizing solution

A methyldiethanolamine decarburization solution and methyldiethanolamine technology are applied in air quality improvement, dispersed particle separation, chemical instruments and methods, etc., can solve problems such as insufficient comprehensive decarburization capacity, and achieve low regeneration energy consumption, The effect of large absorption capacity and high purification degree

Inactive Publication Date: 2005-04-27
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The object of the present invention is to provide a kind of improved N-methyldiethanolamine (MDEA) decarburization solution, overcome the deficiency of comprehensive decarburization ability that existing MDEA decarburization solution exists

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The performance of the MDEA decarburization fluid with morpholine (MAL) and piperazine (PZ) or morpholine (MAL) and diethanolamine (DEA) as activators was comprehensively evaluated by using the laboratory simulation device and conditions described above. The evaluation results are shown in Table 3 and Table 4:

[0026] P

[0027] It can be seen from Table 3 that adding MAL to the PZ-activated MDEA solution can significantly improve the decarburization performance of the solution. For 0.2MPa: add MAL to W MAL / W MDEA+PZ is 0.15 (ie W MAL / W MDEA =0.165) are effective, and the optimum content is W MAL / W MDEA+PZ is 0.10 (ie W MAL / W MDEA =0.11); for 0.3MPa: add MAL to W MAL / W MDEA+PZ is 0.12 (ie W MAL / W MDEA =0.132) are all effective, and the optimum content is W MAL / W MDEA+PZ is 0.10 (ie W MAL / W MDEA = 0.11).

[0028] P

[0029] It can be seen from Table 4 that adding MAL to DEA-activated MDEA significantly improves the decarburiza...

Embodiment 2

[0031] A certain annual production of 40,000 tons of synthetic ammonia decarburization device selects the said MDEA decarburization solution of the present invention (the concentration of MDEA is 36% by weight; the activator is morpholine and diethanolamine; the weight ratio of morpholine and MDEA is 0.06; diethanolamine and The weight ratio of MDEA is 0.2) for decarburization. After being put into operation, the production system is stable, and the absorption capacity is large, and the solution absorbs 20-22Nm of carbon dioxide per cubic meter 3 ;Low consumption: MDEA consumes 0.097 kg / ton of ammonia; diethanolamine consumes 0.019 kg / ton of ammonia; morpholine consumes 0.013 kg / ton of ammonia; steam consumes less than 1.2 tons / ton of ammonia.

Embodiment 3

[0033]The existing MDEA decarburization solution was used in the syngas decarbonization process of a formic acid branch plant, but it could only reach 60% of the design load after the start-up, and there were many degradation products in the solution. After using the MDEA decarburization solution of the present invention (the concentration of MDEA is 30% by weight; the activator is morpholine and piperazine, and the weight ratio of morpholine, piperazine and MDEA is 0.1: 0.1: 1), the result of use shows : MDEA has no obvious degradation, the content of activator is stable, the content of carbon dioxide after purification of syngas is less than 0.1%, and the production load reaches the design capacity.

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Abstract

The present invention relates to one kind of N-methyldiethanolamine decarbonizing solution comprising N-methyldiethanolamine aqua and activating agent, and features that the activating agent comprises morpholine and piperazine or diethanolamine. The decarbonizing solution of the present invention may be used in eliminating CO2 from synthetic gas, city gas, natural gas and other mixed gas, and the sulfide may be also eliminated simultaneously. The decarbonizing solution has the advantages of great absorption capacity, high purifying degree, low regeneration power consumption, etc.

Description

technical field [0001] The invention relates to a decarburization solution for removing carbon dioxide in gas containing carbon dioxide, in particular to an N-methyldiethanolamine (MDEA) decarburization solution. Background technique [0002] It is well known that the removal of carbon dioxide from gases containing carbon dioxide is a widely used technology in industry. For example, in the process of natural gas, petroleum gas, city gas and synthesis gas, it is necessary to remove carbon dioxide. On the other hand, carbon dioxide itself is an important industrial raw material, which can be used to manufacture urea and organic synthesis raw materials. [0003] Since BASF developed the piperazine-activated MDEA decarburization technology in the 1970s, due to its advantages of low regeneration energy consumption, high gas purification, non-degradation of the solution, and no corrosion to carbon steel, the activated MDEA decarburization technology Widely used all over the worl...

Claims

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Application Information

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IPC IPC(8): B01D53/14B01D53/48
CPCY02A50/20
Inventor 张成芳钦淑均张旭陈玲君
Owner EAST CHINA UNIV OF SCI & TECH
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