Method for reducing energy consumption in preparing sodium nitrite through nitrogen oxide

A technology of sodium nitrite and nitrogen oxides, applied in the directions of nitrogen oxides/oxyacids, nitrous acid, etc., can solve problems such as being unsuitable for industrial production, and achieve no influence on the quality of sodium nitrite, easy to popularize and reduce The effect of steam consumption

Active Publication Date: 2014-03-26
HUBEI YITAI PHARMA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the patent publication number is that the method that CN101337662A in

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  • Method for reducing energy consumption in preparing sodium nitrite through nitrogen oxide
  • Method for reducing energy consumption in preparing sodium nitrite through nitrogen oxide
  • Method for reducing energy consumption in preparing sodium nitrite through nitrogen oxide

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Embodiment 1

[0044] A method for reducing nitrogen oxides to prepare sodium nitrite energy consumption, comprising the steps of:

[0045] (1) Prepare a soda ash solution with a mass percentage concentration of 10% to 25% in a primary alkali preparation kettle under the condition of 30-40°C (primary alkali preparation), and set aside;

[0046] (2) After the nitrogen oxides produced in the factory are collected, they are introduced into the tail gas absorption tower for treatment. The tail gas absorption tower uses water as the medium to absorb nitrogen oxides and remove most of the NO 2 , the remaining NO, NO 2 Introduce the alkali absorption tower, and the tail gas absorption tower is generally set at 2 to 4 levels;

[0047] (3) Put the soda ash solution prepared in step (1) into the alkali absorption tower, and introduce the tail gas treated in the tail gas absorption tower in step (2) into the alkali absorption tower for reaction to generate sodium nitrite. The chemical reaction formula...

Embodiment 2

[0056] 1. Under the condition of 30-40℃, add 150kg of anhydrous sodium carbonate (that is, soda ash) under stirring in a primary alkali mixing tank with 1000L water, and prepare about 13% soda ash solution (primary mixing alkali), and set aside;

[0057] 2. Put the prepared soda ash solution into the two-stage alkali absorption tower, introduce the tail gas treated in the tail gas absorption tower, and react at room temperature (25°C);

[0058] 3. When the pH value of the solution is 6-7, the reaction reaches the end point, and the resulting sodium nitrite solution is transported to the concentration kettle, the remaining water is evaporated, the temperature is lowered and crystallized, and centrifuged to obtain 155kg, 98% or more of nitrous acid sodium products.

[0059] According to statistics, about 6.0 tons of steam are consumed per ton of sodium nitrite.

Embodiment 3

[0061] 1. Under the condition of 30-40°C, add 300kg of anhydrous sodium carbonate (that is, soda ash) under stirring in a primary caustic soda mixing tank with 2000L water, and prepare about 13% soda ash solution (primary soda ash mixing), and set aside;

[0062] 2. Put the prepared soda ash solution into the two-stage alkali absorption tower, introduce the tail gas treated in the tail gas absorption tower, and react at room temperature (25°C);

[0063] 3. When the pH value of the solution is 6-7, the reaction reaches the end point, and the generated sodium nitrite solution is retransmitted to the secondary alkali preparation kettle, the temperature is raised to 30-40 °C, and 300 kg of anhydrous sodium carbonate ( i.e. soda ash), prepared into a secondary soda ash solution containing sodium nitrite;

[0064] 4. Put the secondary soda ash solution back into the alkali absorption tower, continue to introduce the tail gas treated by the tail gas absorption tower, and react at roo...

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Abstract

The invention relates to a method for reducing energy consumption in preparing sodium nitrite through nitrogen oxide. The method comprises the following steps of: (1) preparing 10%-30% sodium carbonate solution at 30-40DEG C in a primary alkali preparing vessel; (2) collecting and introducing nitrogen oxide, generated in a factory, into a tail gas absorption tower; (3) putting the sodium carbonate solution prepared in the step (1) into the alkali absorption tower, introducing the tail gas treated by the tail gas absorption tower in the step (2), and reacting to produce sodium nitrite; (4) when reaction is carried out in the alkali absorption tower until the pH value of the solution is 5-8, delivering the produced sodium nitrite to a secondary alkali preparing vessel, thus preparing secondary sodium carbonate solution containing sodium nitrite. The method has the beneficial effects of greatly decreasing the evaporation amount of water in the traditional method, extremely reducing the vapor consumption for producing the sodium nitrite, having no need of investing any cost, as well as no influence on the quality of the sodium nitrite; the method is high in safety, convenient to operate, and extremely easy to popularize.

Description

【Technical field】 [0001] The invention relates to the technical field of fine chemicals, in particular to a method for reducing energy consumption of nitrogen oxides for preparing sodium nitrite. 【Background technique】 [0002] Sodium nitrite is an important inorganic chemical product, which is widely used in dyestuff, medicine, metallurgy, glass, and food processing industries. In recent years, with the continuous increase of domestic and foreign market demand, the development of sodium nitrite products is very rapid, especially in the form of steady rise in the prices of many chemical products in recent years, the price of sodium nitrite products is relatively stable, and the export The volume continues to increase, bringing considerable economic benefits to the enterprise. Moreover, due to the low investment in production equipment, short construction period, and quick results, many factories that originally had this product continue to expand their production capacity a...

Claims

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Application Information

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IPC IPC(8): C01B21/50
Inventor 王正友陈进
Owner HUBEI YITAI PHARMA
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