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Method for preparing sodium hydrogen carbonate for flue gas purification by using alkali wastes

A sodium bicarbonate and flue gas purification technology, applied in the field of flue gas purification, can solve the problems of staying in the crude product stage, increasing the industrial scale, and increasing the cost investment of the preparation process, achieving significant social benefits, solving environmental pollution, Energy Saving Effect

Active Publication Date: 2015-03-25
CHENGDU HUAXITANG INVESTMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Existing patent documents CN101570370 (method for high-resource treatment of cyclohexanone saponification waste lye, 2009-11-04) and CN102874848A (a method for recovering sodium bicarbonate and organic acid sodium salt from cyclohexanone waste lye) method, 2013-01-16) all disclose a production method for producing sodium bicarbonate by using waste lye, especially the patent document CN101570370, which discloses the use of cyclohexanone waste lye to react with carbon dioxide in flue gas to produce The method for obtaining sodium bicarbonate has achieved the process effect of using waste to treat waste and zero discharge, but it has been proved by practice that the quality of sodium bicarbonate obtained by this method is still in the crude product stage. If this method obtains sodium bicarbonate as an adsorbent As a purification process for flue gas desulfurization and denitrification, its removal effect is not ideal. At the same time, the crude product yield of sodium bicarbonate obtained by this method is low. Increase its industrial scale, but also increase the crude product purification process, which greatly improves the cost input of the entire preparation process. For this reason, the present invention emerges as the times require

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  • Method for preparing sodium hydrogen carbonate for flue gas purification by using alkali wastes
  • Method for preparing sodium hydrogen carbonate for flue gas purification by using alkali wastes
  • Method for preparing sodium hydrogen carbonate for flue gas purification by using alkali wastes

Examples

Experimental program
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Embodiment 1

[0072] The preparation method of the present embodiment comprises the steps:

[0073] A: Preparation of sodium sulfate solution: mix waste caustic soda with flue gas, purify pollutants in flue gas to obtain flue gas mixture, and then cycle wash the flue gas mixture to obtain Na 2 SO 4 Washing solution with a concentration of 24%;

[0074] B: Sodium bicarbonate unit: send the washing solution obtained in the above steps into the reactor, and react with ammonium bicarbonate to obtain a sodium bicarbonate suspension;

[0075] C: purification: the sodium bicarbonate suspension is purified to obtain the sodium bicarbonate product,

[0076] In the above steps, the spent caustic soda is a dry solid, and by weight percentage, the spent caustic soda comprises the following components:

[0077] Na 2 CO 3 : 72%;

[0078] Na 2 SO 4 : 20%;

[0079] Others: 8%,

[0080] Pollutants in flue gas include the following components:

[0081] SO 2 and SO 3 : Total 4500mg / Nm 3 ;

[0...

Embodiment 2

[0084] The preparation method of the present embodiment comprises the steps:

[0085] A: Preparation of sodium sulfate solution: mix waste caustic soda with flue gas, purify pollutants in flue gas to obtain flue gas mixture, and then cycle wash the flue gas mixture to obtain Na 2 SO 4 Washing solution with a concentration of 28%;

[0086] B: Sodium bicarbonate unit: send the washing solution obtained in the above steps into the reactor, and react with ammonium bicarbonate to obtain a sodium bicarbonate suspension;

[0087] C: purification: the sodium bicarbonate suspension is purified to obtain the sodium bicarbonate product,

[0088] In the above steps, the spent caustic soda is a dry solid, such as: sodium bicarbonate spent caustic soda, by weight percentage, the spent caustic soda comprises the following components:

[0089] Na 2 CO 3 : 80%;

[0090] Na 2 SO 4 : 15%;

[0091] Others: 5%,

[0092] Pollutants in flue gas include the following components:

[0093] S...

Embodiment 3

[0096] The preparation method of the present embodiment comprises the steps:

[0097] A: Preparation of sodium sulfate solution: mix waste caustic soda with flue gas, purify pollutants in flue gas to obtain flue gas mixture, and then cycle wash the flue gas mixture to obtain Na 2 SO 4 Washing solution with a concentration of 28%;

[0098] B: Sodium bicarbonate unit: send the washing solution obtained in the above steps into the reactor, and react with ammonium bicarbonate to obtain a sodium bicarbonate suspension;

[0099] C: purification: the sodium bicarbonate suspension is purified to obtain the sodium bicarbonate product,

[0100] In the above steps, the spent caustic soda is dry solid, such as: caprolactam incineration spent caustic soda, by weight percentage, spent caustic soda comprises the following components:

[0101] Na 2 CO 3 : 85%;

[0102] Na 2 SO 4 : 17%;

[0103] Others: 3%,

[0104] Pollutants in flue gas include the following components:

[0105] S...

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Abstract

The invention discloses a method for preparing sodium hydrogen carbonate for flue gas purification by using alkali wastes. According to the preparation method, the alkali wastes are used for reacting with flue gas, a cleaning solution containing Na2SO4 with a certain concentration is generated after mixing and washing, and then sodium hydrogen carbonate is obtained by taking the cleaning solution to react with ammonium hydrogen carbonate. The method comprises three steps of preparing a sodium sulfate solution, preparing a sodium hydrogen carbonate unit and purifying, and realizes an aim of treatment of a waste with another waste by using the alkali wastes to treat waste gas. Moreover, by adopting the method, a sodium hydrogen carbonate product with a relatively high value can be obtained, so that energy sources are saved, pollution is reduced, the cost of flue gas purification is reduced, secondary pollution caused by the flue gas purification is avoided, the pollution of the alkali wastes to the environment is thoroughly solved, and the social benefit is very significant.

Description

technical field [0001] The invention relates to a method for preparing sodium bicarbonate in flue gas purification by utilizing waste caustic soda, specifically relates to the preparation technology of sodium bicarbonate used in flue gas purification by waste caustic, and belongs to the field of flue gas purification. Background technique [0002] The continuous progress of petroleum and chemical industries has not only promoted economic development, but also caused pollution to the environment. At present, the global pollution problem has become increasingly serious, and has attracted widespread attention and attention from all over the world, especially coal-fired power plants. , coal-fired boilers, and waste incineration flue gas emissions, etc., have seriously polluted the atmosphere. We know that coal-fired flue gas contains a large amount of soot, carbon dioxide, SO 2 and NO X Among them, the carbon dioxide emitted by fuel combustion is the main substance that causes ...

Claims

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Application Information

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IPC IPC(8): C01D7/02
Inventor 李东林汪然刘应峰陈洪会郎治曹静
Owner CHENGDU HUAXITANG INVESTMENT
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