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Method for producing ammonium sulfamate by utilization of exhaust gas containing ammonia and carbon dioxide

A technology of ammonium sulfamate and carbon dioxide, which is applied in the direction of sulfamic acid, nitrogen and non-metallic compounds, can solve the problems of complex process, low economic value, cumbersome operation, etc., and achieve the goal of simple process, reduced consumption and reduced energy consumption Effect

Active Publication Date: 2015-11-25
SHENYANG RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the separation and recycling of ammonia and carbon dioxide tail gas has always been a problem that cannot be ignored.
However, on the one hand, the economic value of using these processes to produce inorganic salt products is very low
On the other hand, in order to obtain high-quality inorganic salt products, the process is complicated and the operation is cumbersome

Method used

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  • Method for producing ammonium sulfamate by utilization of exhaust gas containing ammonia and carbon dioxide
  • Method for producing ammonium sulfamate by utilization of exhaust gas containing ammonia and carbon dioxide
  • Method for producing ammonium sulfamate by utilization of exhaust gas containing ammonia and carbon dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Embodiment 1 uses water to absorb the waste gas produced in the sodium cyanate process by the urea method.

[0045] The amount and composition of high-temperature waste gas produced by the industrial production of 1 ton of sodium cyanate by urea method are shown in Table 1.1.

[0046] Table 1.1 The amount and composition of waste gas produced by urea process industrial production of 1 ton of sodium cyanate

[0047] composition

[0048] water

[0049] After the above-mentioned waste gas passes through the cyclone separator to remove solid particles, it enters the water jet vacuum pump, and then passes into the two-stage absorption tower with absorption liquid circulation. Used 1110Kg water to absorb waste gas altogether (production 1 ton of sodium cyanate product), obtain the absorption liquid 2020Kg that contains ammonia and carbon dioxide in the absorption liquid tank. The specific gravity of the absorption liquid is 1.15Kg / L, the temperature is 1...

Embodiment 2

[0050] Embodiment 2 uses the exhaust gas absorption liquid containing ammonia and carbon dioxide to prepare ammonium sulfamate

[0051] The absorption liquid (specific gravity is 1.15Kg / L in 500Kg embodiment 1, and temperature is 16 ℃, contains ammonia 16.6%, contains carbon dioxide 19.9%) in the synthetic kettle, and adds 470Kg ammonium sulfamate in the synthetic kettle, control The feeding speed is controlled, and the temperature in the kettle is controlled in the range of 0-60° C., and the reaction is carried out until the pH in the kettle is = 7. 98.5Kg of carbon dioxide was obtained. At the same time, all the reaction solution was put into the precipitation kettle, and vacuum distilled at 80°C. Distill until the specific gravity of the solution is 1.40Kg / L, cool to 10°C, crystallize, and filter. Obtain 300K filtrate, 200Kg filter cake. The filtrate is sent to the mother liquor tank for the next batch to be applied mechanically, and mixed with the reaction liquid of the...

Embodiment 3

[0052] Embodiment 3 uses the exhaust gas absorption liquid containing ammonia and carbon dioxide to prepare ammonium sulfamate

[0053] The absorption liquid (specific gravity is 1.15Kg / L in 500Kg embodiment 1, and temperature is 16 ℃, contains ammonia 16.6%, contains carbon dioxide 19.9%) in the synthetic kettle, and adds 470Kg ammonium sulfamate in the synthetic kettle, control The feeding speed is controlled, and the temperature in the kettle is controlled in the range of 0-60° C., and the reaction is carried out until the pH in the kettle is = 7. 98.4Kg of carbon dioxide was obtained. At the same time, all the reaction solution was added into the precipitation kettle, and the 300K filtrate obtained in Example 2 was added into the precipitation kettle from the mother liquor tank. Vacuum distillation at 80°C. Distill until the specific gravity of the solution is 1.43Kg / L, cool to 10°C, crystallize, and filter. Obtain 300K filtrate, 557Kg filter cake. The filtrate is sent...

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Abstract

The invention relates to the field of fine chemical industry, especially to a method for producing ammonium sulfamate by the utilization of exhaust gas containing ammonia and carbon dioxide that is produced during industrial production processes of melamine, sodium cyanate and nitrogenous fertilizer. Water absorbs tail gas containing ammonia and carbon dioxide so as to form an absorption liquid containing NH3-CO2-H2O, and the absorption liquid reacts with sulfamic acid to generate ammonium sulfamate and carbon dioxide. According to the method, by combining ammonia into fine chemicals, ammonium sulfamate with high added value is generated and high-purity carbon dioxide is obtained simultaneously. By the method, environmental pollution can be minimized and harmful gases can be changed into useful things.

Description

technical field [0001] The invention relates to the field of fine chemical industry, in particular to a method for producing ammonium sulfamate by using waste gas containing ammonia and carbon dioxide produced in the industrial production process of melamine, sodium cyanate and nitrogen fertilizer. Background technique [0002] In the industrial production process of chemical raw materials such as melamine, sodium cyanate and nitrogen fertilizer, a large amount of ammonia and carbon dioxide waste gas are often involved. [0003] Such as the reaction equation for preparing melamine: [0004] 6CO(NH 2 ) 2 →3C 3 N 3 (NH 2 ) 3 +CO 2 |+6NH 3 | [0005] Such as the reaction equation for preparing sodium cyanate: [0006] Na 2 CO 3 +3CO(NH 2 ) 2 →2NaCNO+CO 2 |+2NH 3 |+H 2 O| [0007] Direct discharge of ammonia and carbon dioxide tail gas into the atmosphere will pollute the environment and affect people's quality of life. The state has ordered to prohibit direct ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/096
Inventor 李付刚鄢冬茂李文骁阎士杰
Owner SHENYANG RES INST OF CHEM IND
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