High-efficiency desulfurizing combined solvent

A solvent and high-efficiency technology, applied in the field of renewable and high-efficiency desulfurization combined solvents, can solve the problems of low corrosiveness, low absorption rate and high cost, and achieve the effects of high selectivity, low energy consumption and reduced energy consumption.

Inactive Publication Date: 2014-01-22
BEIJING BOOTES ELECTRIC POWER SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] SO disclosed in Chinese patents 200910116568.9 and 200910116567.4 2 Absorbents use ionic liquids of linear or cyclic amines as renewable SO 2 Absorbent, since the absorbents used in these two patents are all ionic liquids, the absorption rate is low and the cost is high, which is not conducive to industrial application
A kind of SO containing hexamethylenediamine, hexamethylenediamine heavy component and dispersant disclosed in patent 03111216.1 2 Remover, which has the characteristics of low corrosion and low cost, but the absorption efficiency and absorption capacity of the remover are very low

Method used

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  • High-efficiency desulfurizing combined solvent

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Embodiment 1

[0017] Simulated SO in flue gas 2 Gas volume fraction 0.4%, CO 2 The gas volume fraction is 12%, and the rest is supplemented by air. A high-efficiency desulfurization combined solvent of the present invention, the mass percentage of ethylenediamine in the first component is 1.8%, the mass percentage of N-methylpyrrolidone in the second component is 1.2%, and the phosphoric acid in the third component adjusts the pH to neutral nature, and the rest is water.

[0018] The entire process flow of this embodiment is: the simulated flue gas enters the absorption tower from the bottom of the absorption tower, the high-efficiency desulfurization combined solvent enters from the top of the absorption tower, and the packing surface in the tower contacts with the flue gas countercurrently, and absorbs SO through the barren liquid. 2 The clean flue gas after the gas is discharged from the top of the absorption tower to absorb SO 2 The rich liquid after the gas is discharged from the bo...

Embodiment 2

[0021] Simulated SO in flue gas 2 Gas volume fraction 0.4%, CO 2 The gas volume fraction is 12%, and the rest is supplemented by air. A high-efficiency desulfurization combined solvent of the present invention, the mass percentage of ethylenediamine in the first component is 1%, the mass percentage of diethylenetriamine is 1%, and the mass percentage of N-methylpyrrolidone in the second component is 1%, The boric acid in the third component adjusts the pH value to 6, and the rest is water.

[0022] The whole process flow of this embodiment is the same as that of Embodiment 1.

[0023] The simulated flue gas absorption temperature is 40°C, and the desorption temperature is 102°C. After treatment, the desulfurization rate can reach more than 98%.

Embodiment 3

[0025] Simulated SO in flue gas 2 Gas volume fraction 0.5%, CO 2 The gas volume fraction is 12%, and the rest is supplemented by air. A high-efficiency desulfurization combined solvent of the present invention, the mass percent of triethylenetetramine in the first component is 1%, the mass percent of propylenediamine is 1%, and the mass percent of dimethyl sulfoxide in the second component is 2%, Phosphoric acid in the third component adjusts the pH value to neutral, and the rest is water.

[0026] The whole process flow of this embodiment is the same as that of Embodiment 1.

[0027] The simulated flue gas absorption temperature is 50°C, and the desorption temperature is 108°C. After treatment, the desulfurization rate can reach more than 99%.

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Abstract

The invention relates to a high-efficiency desulfurizing combined solvent which is characterized by having extremely high absorption selectivity on an SO2 gas and higher velocity on the absorption and desorption of the SO2 gas. The high-efficiency desulfurizing combined solvent concretely comprises the following components: a first component, a second component and a third component, wherein the first component is a mixture or any single substance of substances, namely N-methyl pyrrolidone or dimethyl sulfoxide and the like, and the weight percent of the first component accounts for 0.1%-50% of the combined solvent; the second component a mixture or any single substance of polyamine, namely ethylene diamine, propane diamine, diethylenetriamine, triethylenetetramine, and the like which at least contain two amine groups, and piperazine, and the weight percent of the second component accounts for 0.1%-50% of the combined solvent; the third component is the balance of the combined solvent and contains a mixture or any single substance of other acids, namely phosphoric acid, boracic acid, citric acid, and the like, and water; the pH value of the combined solvent is regulated to 5-8. The high-efficiency desulfurizing combined solvent disclosed by the invention is low in volatility without waste gas and waste liquor discharge, can be recycled for multiple times by being desorbed and regenerated, can be used for desorbing the (dry basis) SO2 gas with the purity of 99% and is suitable for being used as an absorbent of the SO2 gas contained in a power plant waste gas.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization, in particular to SO 2 Combination solvents for renewable and efficient desulfurization of gases. Background technique [0002] With the development of industrialization and automation in our country, the demand and consumption of energy in our country are obviously on the rise, and the pollution to the environment has also increased. In my country, it is mainly the combustion of sulfur-containing coal that causes SO in the flue gas 2 Gas emissions are also increasing day by day, resulting in an astonishing rate of development of acid rain. The pollution of acid rain not only has a huge impact on construction, agriculture and other industries, but also causes great harm to human health. In order to ensure the sustainable development of economy and environment and protect the healthy existence of human beings, effective measures should be taken to reduce SO in flue gas. 2 Gas em...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
Inventor 王天博程里全曾之俊张孔瑜崔一尘李永旺马红梁荣娣侯晶晶
Owner BEIJING BOOTES ELECTRIC POWER SCI & TECH
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