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Reproducible polytertiaryamine sulfur dioxide absorbent and preparation method thereof

A technology of polybasic tertiary amines and sulfur dioxide, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve the problems of high industrial cost and operation cost, easily oxidized absorbent, unfavorable practical application, etc., and achieve high absorption , low toxicity, large absorption capacity

Active Publication Date: 2013-10-16
BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of absorbent has the following problems in absorbing sulfur dioxide: (1) the N-H bond is easily oxidized, which makes the absorbent invalid; (2) the primary and secondary amino groups are highly alkaline, and the combination with the proton is too stable, ( 3) The structure formed by the absorbent absorbing sulfur dioxide is relatively stable, and the high desorption temperature causes high energy consumption, high industrial cost and operating cost, which is not conducive to the practical application of industrial production

Method used

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  • Reproducible polytertiaryamine sulfur dioxide absorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of renewable polyvalent tertiary amine sulfur dioxide absorbent comprises the following steps:

[0026] Connect the three-necked flask to a reflux condenser, a constant pressure dropping funnel, and a stirring device. Add triethylenetetramine to the three-necked flask, add excess formic acid, add formaldehyde aqueous solution dropwise according to the molar ratio of triethylenetetramine to formaldehyde 1:6, and reflux for 48 hours. After the reaction was finished, excess formic acid and water were removed by normal pressure distillation, and the reaction product was evaporated by vacuum distillation. The product is a colorless transparent liquid, and the product is placed in a desiccator for later use.

[0027] Accurately weigh the above product with a balance, dissolve it in a certain amount of water, add a small amount of hydroquinone, a small amount of methylethanolamine, and an appropriate amount of phosphoric acid, and the composition of the...

Embodiment 2

[0031] The preparation method of renewable polyvalent tertiary amine sulfur dioxide absorbent comprises the following steps:

[0032] Connect the three-necked flask to a reflux condenser, a constant pressure dropping funnel, and a stirring device. Add diethylenetriamine to the three-necked flask, add excess formic acid, add formaldehyde aqueous solution dropwise according to the molar ratio of diethylenetriamine and formaldehyde of 1:5, and reflux for 24 hours. After the reaction was finished, excess formic acid and water were removed by normal pressure distillation, and the reaction product was evaporated by vacuum distillation. The product is light yellow transparent liquid, put the product in a desiccator for later use.

[0033] Accurately weigh pentamethyldiethylenetriamine with a balance, dissolve it in a certain amount of water, add a small amount of hydroquinone, a small amount of methylethanolamine, and an appropriate amount of sulfuric acid, and the composition of th...

Embodiment 3

[0037] The preparation method of renewable polyvalent tertiary amine sulfur dioxide absorbent comprises the following steps:

[0038] Connect the three-necked flask to a reflux condenser, a constant pressure dropping funnel, and a stirring device. Add pentaethylene hexamine and a small amount of palladium-carbon catalyst in the three-necked flask, add formaldehyde solution dropwise according to the molar ratio of pentaethylene hexamine and formaldehyde of 1:8, and at the same time pass hydrogen into the reaction flask, and reflux for 48 hours. After the reaction was finished, after removing water and low-boiling impurities by distillation under normal pressure, the reaction product was evaporated by distillation under reduced pressure. The product is a colorless transparent liquid, and the product is placed in a desiccator for later use.

[0039] Accurately weigh the above product with a balance, dissolve it in a certain amount of water, add a small amount of hydroquinone, a ...

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Abstract

The invention relates to a reproducible polytertiaryamine sulfur dioxide absorbent and a preparation method thereof. The absorbent comprises the following components: (1) polytertiaryamine having a mass concentration in the range from 1% to 80%, which is taken as the major component of the absorbent, wherein the polytertiaryamine exists in a solution in the form of unionized polytertiaryamine, partially ionized quaternary ammonium salt and completely ionized quaternary ammonium salt due to addition of an acid difficult to volatilize; (2) a phenol or quinone material having a mass concentration in the range from 0.01% to 1%, which is used as an antioxidant of the absorbent; (3) 1-50wt% of acid difficult to volatilize, which is used as the cosolvent and stabilizer for the polytertiaryamine; (4) 0.1-10wt% of monoalcohol amine, which is used as an activator of the absorbent; (5) 10-90wt% of water. The absorbent absorbs sulfur dioxide in mixed gases at a low temperature and releases the absorbed sulfur dioxide gas at a high temperature to generate a sulfur dioxide by-product having a dry basis concentration greater than 99%; the absorbent can be recovered and reused.

Description

technical field [0001] The invention relates to a renewable multi-component tertiary amine sulfur dioxide absorbent and a preparation method thereof. The absorbent can be regenerated and reused, and belongs to the technical field of environmental protection and gas purification. Background technique [0002] Relevant statistics show that SO 2 Has become the world's largest pollutant, in recent years, my country's SO 2 The emission exceeds 25Mt / a, and in my country's land area, an average of more than 2t / a of SO is being produced per square kilometer. 2 Pollutants, each year due to acid rain and SO 2 The economic loss caused by pollution to the ecological environment and the impact on human health is more than 110 billion yuan, and the reduction of SO emissions 2 pollution is imminent. [0003] At present, the most mature flue gas desulfurization technology is the wet desulfurization technology. At present, domestic and foreign thermal power plants generally adopt the lim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
Inventor 刘科伟梅雪庄烨刘汉强韩晨
Owner BEIJING GUODIAN LONGYUAN ENVIRONMENTAL ENG
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