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Process for producing sodium nitrite by direct crystallization process

A technology of sodium nitrite and crystallization method, applied in nitrous acid, chemical industry, sustainable manufacturing/processing and other directions, can solve the problems of inability to increase the concentration of lye, large one-time investment and high absorption tower, and achieve small investment and economical Steam, the effect of reducing the cost of use

Inactive Publication Date: 2009-01-07
贾令春
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The disadvantages of this method: 1. The one-time investment is too large
2. The absorption tower is too high, generally 20 meters, because its material is stainless steel 304, and the finished product of 304 stainless steel per ton is more than 45,000 yuan per ton
7. The absorption tower needs to be filled with dispersed packing, and the tower is absorbed by spraying, so the concentration of lye cannot be increased, and crystallization can only be obtained by steam concentration in the later stage

Method used

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  • Process for producing sodium nitrite by direct crystallization process
  • Process for producing sodium nitrite by direct crystallization process
  • Process for producing sodium nitrite by direct crystallization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Soda-dissolving process:

[0044] Add soda ash and water into the 1# chemical alkali tank, stir evenly, and prepare lye, the concentration of the lye is controlled at 49Be', put it into the 1# liquid alkali storage tank, and then send it to 1# for absorption through the lye pump bucket, 2# absorption bucket and 3# absorption bucket;

[0045] 2# chemical soda tank, discharge the mother liquor after the reaction of 1# absorption barrel, 2# absorption barrel and 3# absorption barrel into the barren solution tank, and then send it to 2# chemical soda tank to supplement soda ash, the concentration of lye is controlled at 49Be ';

[0046] (2) Ammoxidation process:

[0047] Mix ammonia gas with air, control the ratio of ammonia gas and oxygen in the air at 1:13, transfer to the ammonia oxidation furnace, control the temperature at 750°C, carry out the ammonia oxidation reaction, and prepare the mixed gas, which comes out from the bottom of the ammonia oxidation furnace ...

Embodiment 2

[0063] (1) Soda-dissolving process:

[0064] Add soda ash and water into the 1# chemical soda tank, stir evenly, and prepare lye, the concentration of lye is controlled at 51Be', put it into the 1# liquid soda storage tank, and then send it to 1# for absorption through the lye pump bucket, 2# absorption bucket and 3# absorption bucket;

[0065] 2# chemical soda tank, discharge the mother liquor after the reaction of 1# absorption barrel, 2# absorption barrel and 3# absorption barrel into the barren solution tank, and then send it to 2# chemical soda tank to supplement soda ash, the concentration of lye is controlled at 51Be ', for the production of sodium nitrate;

[0066] (2) Ammoxidation process:

[0067] Mix ammonia gas with air, control the ratio of ammonia gas and oxygen in the air at 1:14, transfer to the ammonia oxidation furnace, control the temperature at 775°C, carry out the ammonia oxidation reaction, and prepare the mixed gas, which comes out from the bottom of t...

Embodiment 3

[0083] (1) Soda-dissolving process:

[0084] Add soda ash and water into the 1# alkali tank, stir evenly, and prepare lye, the concentration of the lye is controlled at 50Be', put it into the 1# liquid alkali storage tank, and then send it to 1# for absorption through the lye pump bucket, 2# absorption bucket and 3# absorption bucket;

[0085] 2# chemical soda tank, discharge the mother liquor after the reaction of 1# absorption barrel, 2# absorption barrel and 3# absorption barrel into the barren liquid tank, and then send it to 2# chemical soda tank to supplement soda ash, and the concentration of lye is controlled at 50Be ', for the production of sodium nitrate;

[0086] (2) Ammoxidation process:

[0087] Mix ammonia gas with air, control the ratio of ammonia gas and oxygen in the air at 1:16, transfer to the ammonia oxidation furnace, control the temperature at 760°C, carry out the ammonia oxidation reaction, and prepare the mixed gas, which comes out from the bottom of ...

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Abstract

The invention relates to a processing of producing sodium nitrite by using a direct crystallization process. By using the process, sodium nitrite crystalline substances are prepared under the condition without steam concentration, and the sodium nitrite crystalline substances are centrifuged and separated directly, and then dried to obtain sodium nitrite products. The process has the advantages of having simple process, reducing consumption, saving energy resources, reducing workshop consumption cost by about 20 percent compared with the prior process, etc. and can product sodium nitrate byproducts and recycle heat and the byproduct of saturated vapour.

Description

technical field [0001] The invention relates to a technique for producing sodium nitrite by a direct crystallization method. Background technique [0002] At present, the synthesis method of sodium nitrite includes the following steps: mixing ammonia gas and air, entering the oxidation furnace for oxidation, and after the waste heat boiler produces steam to cool down, and then absorbs it with 25-28Be' lye through a 5-6 stage absorption tower to produce The neutralized liquid is transferred to a double-effect evaporator for concentration, and then enters a negative pressure crystallizer to cool down and crystallize, and then centrifuged and dried to obtain the finished product. [0003] Its shortcoming of this method: 1, one-time investment is too big. 2. The absorption tower is too high, generally 20 meters, because its material is stainless steel 304, and the finished product of 304 stainless steel per ton is more than 45,000 yuan per ton. 3. For an annual output of 30,00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/50
CPCY02P20/10Y02P20/129
Inventor 贾令春
Owner 贾令春
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