Method and device for preparing sodium nitrite by utilizing mother solution

A technology of sodium nitrite and mother liquor, applied in the preparation of alkali metal nitrate, etc., to achieve the effects of reducing maintenance costs, increasing nitrous ratio, and improving service life

Active Publication Date: 2013-09-11
SHIJIAZHUANG FENGSHAN CHEM
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

"But this patent application does not address the NaNO 2 Na in mother liquor 2 CO 3 Problems with high content and increasing product nitrous ratio

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  • Method and device for preparing sodium nitrite by utilizing mother solution

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings.

[0017] The present invention utilizes mother liquor to prepare the device of sodium nitrite such as figure 1 As shown, it includes a crystallizer 2, a thickener 3, a centrifuge 4, a mother liquor tank 5, a mother liquor absorption tower 6, a circulation pump 15 and a storage tank 16. The upper part of the crystallizer is equipped with a flash chamber 1, the raw material liquid pipeline is connected to the feed inlet of the flash chamber, the gas outlet at the top of the flash chamber is connected to the vacuum system, and the flash chamber and the lower evaporator have a raw material liquid connection path . The crystallization solution outlet 19 of the crystallizer is connected to the centrifuge through the thickener 3, and the mother liquor outlet of the centrifuge is connected to the mother liquor tank. The crystallizer overflow outlet 18 and the thickener overflo...

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Abstract

The invention relates to a method and a device for preparing sodium nitrite by utilizing a mother solution. The device comprises a crystallizer, a thickner, a centrifugal machine, a mother solution absorption tower, a circulating pump and a storage tank, wherein a converted gas pipeline is connected to a converted gas inlet of the mother solution absorption tower; a mother solution tank outlet and a mother solution outlet of the mother solution absorption tower are connected to an inlet of the circulating pump; an outlet of the circulating pump is divided into two paths, one path is connected to a mother solution inlet, and the other path is connected to the storage tank; the mother solution contacts converted gas reversely in the mother solution absorption tower, so that the content of Na2CO3 is reduced; the absorbed mother solution flows to the storage tank by the mother solution outlet and the circulating pump; and the absorbed mother solution which is deviated from the storage tank is mixed with a raw material solution and is evaporated, crystallized and subjected to centrifugal separation to obtain a sodium nitrite product. According to the method, the raw materials of the sodium nitrite is enlarged and a nitrous ratio of the product is improved by reducing the content of Na2CO3 in the mother solution; and the sodium nitrite can be produced by reducing the content of Na2CO3 in the mother solution according to market demands, and the mother solution also can be conveyed to a conversion tower to produce sodium nitrate.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical product production and relates to NaNO 2 Mother liquor reabsorption reduces Na 2 CO 3 The method of content, be specifically related to a kind of method and device that utilize mother liquor to prepare sodium nitrite. Background technique [0002] Currently, sodium nitrite (NaNO 2 ) and sodium nitrate (NaNO 3 ) (referred to as "two sodium"), the raw material solution contains a large amount of NaNO 2 with NaNO 3 In addition, it also contains 3~5g / L Na 2 CO 3 , NaNO is produced by evaporation, crystallization and centrifugation 2 Na in the mother liquor 2 CO 3 If the content is increased to 10~15g / L, if it is directly used for secondary evaporation to produce sodium nitrite products, there will be product moisture, Na 2 CO 3 High content, not up to the quality requirements of sodium nitrite, etc. At the same time, Na 2 CO 3 When the content is high, it is easy to mix with t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D9/06
Inventor 康延寿任保廷
Owner SHIJIAZHUANG FENGSHAN CHEM
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