A kind of production device of sodium nitrite

A production device, sodium nitrite technology, applied in the chemical industry, can solve the problems of inability to reduce the heat load at the hot end, leakage and interconnection of heat exchange equipment, and high evaporation end temperature, so as to improve the vacuum degree of evaporation, reduce manpower and material resources, and ensure The effect of product quality

Active Publication Date: 2022-01-18
襄阳泽东化工集团股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, manufacturers in the same industry adopt indirect heat exchange for vacuum circulation cooling in the post-processing section. This method has extremely high requirements on the circulating water at the cold end. However, in the actual production environment, the heat exchange effect of this method is not ideal, and it cannot effectively reduce the heat load at the hot end Reduced, so that the evaporation vacuum cannot reach the ideal state, and the evaporation end temperature is high, which reduces the recovery rate of sodium nitrite and greatly affects the product quality
Moreover, this method also has the following disadvantages: 1. The area of ​​the required heat exchanger is large, which increases the purchase cost and maintenance cost; 2. The large flow rate and low temperature of the circulating water required for cooling the cold end, in the case of increasingly scarce groundwater, replenishment Deep well water will be difficult
3. The required circulating water at the cold end must maintain a good index to prevent scaling and blockage of circulating pipes and equipment. This requires a large amount of chemicals and fresh water supplementation, and at the same time increases the workload of equipment cleaning; 4. Heat exchange equipment There is a leakage and cross-linking situation, and the water containing a very small amount of material at the hot end is connected to the circulating water at the cold end, resulting in qualified water that cannot be processed

Method used

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  • A kind of production device of sodium nitrite
  • A kind of production device of sodium nitrite

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Embodiment Construction

[0015] Such as figure 1 Shown, the embodiment of the present invention provides a kind of production device of sodium nitrite, comprises dissolving alkali tank 8, lye absorption tower 1, crystallizer 2, thickener 3, centrifuge 4, mother liquor tank 5, conversion tower 6, Heat exchange mechanism 7;

[0016] The crystallizer 2 includes a flash chamber 21 at the top and a crystallization chamber 22 at the bottom, the flash chamber 21 is provided with a vacuum device 211, and the entrance of the flash chamber 21 is connected with the The outlet of the lye absorption tower 1 is connected; the crystallization chamber 22 includes an overflow liquid outlet 221 positioned at the top and a crystallization liquid outlet 222 positioned at the bottom, and the crystallization liquid outlet 222 passes through the bottom outlet of the thickener 3 31 is connected to the centrifuge 4, the mother liquor outlet 41 of the centrifuge 4 is connected to the mother liquor tank, the thickener 3 is als...

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Abstract

The invention provides a production device of sodium nitrite, comprising an alkali-dissolving pool, an alkali absorption tower, a crystallizer, a thickener, a centrifuge, a mother liquor tank, a conversion tower, and a heat exchange mechanism; the heat exchange mechanism includes a condenser, Ejector, circulating water tank, circulating pump and cooling tower, the outlet of the flash chamber of the crystallizer is communicated with the first inlet of described circulating water tank through condenser and injector, and the outlet of circulating water tank is connected with described circulating pump The top of the cooling tower is connected, and the outlet of the cooling tower is connected with the second inlet of the circulating water tank, and the outlet of the circulating water tank is connected with the inlet of the lye absorption tower through an alkali-dissolving pool; the present invention adopts a heat exchange mechanism, The circulating water tank pumps the vacuum circulating water into the upper part of the cooling tower through the circulating pump, and uses the fan to pump the air, so that the air directly contacts the water to dissipate heat. efficiency and quality, and make up for the disadvantages of the original heat exchanger.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a sodium nitrite production device. Background technique [0002] my country's two sodium products are produced by absorbing nitrogen oxides with lye. The new process of directly absorbing high-concentration disodium production with lye is the method adopted by large-scale disodium production enterprises. Due to the continuous improvement of national tail gas emission standards, increasing the operating pressure of the alkali absorption system is conducive to the positive reaction direction of nitrogen monoxide to nitrogen dioxide, further improving the absorption rate of nitrogen oxides, and reducing the emission of nitrogen oxides in tail gas. However, if the pressure is too high, the oxidation degree of nitric oxide in the gas will increase, thereby affecting the nitrous ratio of the neutralizing solution. With the depletion of global energy sources, the deteriorat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B21/50
CPCC01B21/50
Inventor 宋开荣胡兵李顺彬
Owner 襄阳泽东化工集团股份有限公司
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