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Composite inhibitor for recovering by-products generated during desulphurization by sodium alkali method as well as preparation and application thereof

A compound inhibitor and desulfurization by-product technology, applied in the field of flue gas desulfurization, can solve the problems of unclear inhibitory effect and mechanism, neglect of sulfite selectivity, inactivation, etc., to avoid secondary pollution and realize resource utilization Ease of use and operation

Inactive Publication Date: 2013-01-30
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Generally speaking, the basic theoretical research on the inhibition of oxidation reaction by sulfite is still lacking, and its inhibitory effect and mechanism are still unclear, especially the selectivity of inhibitors to different types of sulfites (such as the same inhibitor on The control of the sodium sulfite oxidation reaction system is more effective, but inactivation may occur in the sodium sulfite oxidation system)

Method used

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  • Composite inhibitor for recovering by-products generated during desulphurization by sodium alkali method as well as preparation and application thereof
  • Composite inhibitor for recovering by-products generated during desulphurization by sodium alkali method as well as preparation and application thereof
  • Composite inhibitor for recovering by-products generated during desulphurization by sodium alkali method as well as preparation and application thereof

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1 Preparation and use of the present embodiment inhibitor

[0026] Weigh catechol (C 6 h 6 o 2 ) 0.12g, acetonitrile (C 2 h 3 N) 0.05ml, dissolved in 50ml deionized water at 45°C, adjusted the pH value of the solution to about 6.0 with hydrochloric acid and ammonia water, stirred and mixed to make a composite inhibitor;

[0027] In the compound inhibitor that makes, the mol ratio of catechol and acetonitrile is 1: 1, and the amount concentration of catechol is 2.18 * 10 -2 mol L -1 .

[0028] Measure above-mentioned inhibitor 1.0ml, add in the sodium sulfite oxidation reactor, the total volume of reaction solution is 200ml, at this moment the concentration of catechol and acetonitrile in the reactor is 1.09×10 -4 mol L -1 , the oxidation rate of sodium sulfite under inhibited conditions is about 2 / 3 of that without inhibited conditions.

Embodiment 2

[0029] Embodiment 2 Preparation and use of the present embodiment inhibitor

[0030] Weigh catechol (C 6 h 6 o 2 ) 0.24g, acetonitrile (C 2 h 3 N) 0.1ml, dissolved in 50ml deionized water at 45°C, adjusted the pH value of the solution to about 6.0 with hydrochloric acid and ammonia water, stirred and mixed to make a compound inhibitor;

[0031] In the obtained composite inhibitor, the mol ratio of catechol and acetonitrile is 1: 1, and the amount concentration of catechol is 4.36×10 -2 mol L -1 .

[0032] Measure above-mentioned inhibitor 1.0ml, add in the sodium sulfite oxidation reactor, the total volume of reaction solution is 200ml, and the concentration of pyrocatechol and acetonitrile in the reactor is 2.18×10 -4 mol L -1 , the oxidation rate of sodium sulfite under inhibited conditions is about 1 / 2 of that without inhibited conditions.

Embodiment 3

[0033] Embodiment 3 Preparation and use of the present embodiment inhibitor

[0034] Weigh catechol (C 6 h 6 o 2 ) 0.47g, acetonitrile (C 2 h 3 N) 0.2ml, dissolved in 50ml deionized water at 45°C, adjusted the pH value of the solution to about 6.0 with hydrochloric acid and ammonia water, stirred and mixed to make a composite inhibitor;

[0035] In the composite inhibitor that makes, the mol ratio of catechol and acetonitrile is 1: 1, and the amount concentration of catechol is 8.54 * 10 -2 mol L -1 .

[0036] Measure above-mentioned inhibitor 1.0ml, add in the sodium sulfite oxidation reactor, the total volume of reaction solution is 200ml, and the concentration of pyrocatechol and acetonitrile in the reactor is 4.27×10 -4 mo1·L -1 , the oxidation rate of sodium sulfite under suppressed conditions is about 10 / 27 of that without suppressed conditions.

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Abstract

The invention discloses a composite inhibitor for recovering by-products generated during desulphurization by sodium alkali method as well as preparation and application thereof, belonging to the filed of flue gas desulfurization. The inhibitor is prepared by mixing catechol and acetonitrile, wherein the molar ratio of catechol to acetonitrile is (1-10):1. The raw materials of the composite inhibitor are common and easy to acquire, and operating conditions are simple. The composite inhibitor provided by the invention has obvious inhibition effects, can be widely applied to sodium alkali method desulphurization system in medium and small boilers more than 75t in China. Under the premise of not changing the original operating conditions, the oxidation of sodium sulfite in the system can be effectively inhibited, so that the content of sodium sulfite in the by-products is increased, and the utilization ratio of the desulphurization by-products is increased. The inhibitor provided by the invention has low concentration, small use amount, high efficiency, no secondary pollution and popularization value.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization in air pollution control, and specifically relates to providing a novel inhibitor for recovering by-products of sodium-alkali desulfurization and its preparation and application. The invention reduces the oxidation reaction rate of sodium sulfite by using an inhibitor, thereby increasing the content of sodium sulfite in the desulfurization by-products, facilitating the recycling of the desulfurization by-products, not only improving the recovery yield of the by-products, but also reducing the energy in the recovery process. consumption. Background technique [0002] The sodium-alkali desulfurization process has been relatively mature in foreign countries, but it is still in its infancy in my country. At present, it is mainly used in the flue gas pollution control of small and medium-sized industrial boilers. The basic principle is to use sodium-based alkaline substances such as s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/50
Inventor 崔帅汪黎东郝思琪杜蕾霞
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)