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Production technology of nitric acid

A production process and technology of nitric acid, applied in the directions of nitric acid, nitrogen oxides/oxyacids, etc., can solve the problems of lack of raw material sources in the production process, unrecyclable raw materials, environmental pollution of by-products, etc., so as to achieve easy separation and clean raw materials. , the effect of large acid production

Inactive Publication Date: 2015-04-29
丹阳恒安化学科技研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, nitric acid is widely used in chemical production. How to produce high-purity nitric acid and the simple process has become the focus of manufacturers. However, the source of raw materials for the production process is scarce, and the by-products produced pollute the environment, and the raw materials cannot be recycled. , the preparation process is complicated, and the quality of the obtained nitric acid is not high, which needs further purification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Compressed air: Pass the air into the compression tank, control the pressure to 2.5 standard atmospheres, and compress the air into liquid;

[0018] (2) Fractional distillation: Pass the compressed liquid obtained in step (1) into a fractionation tower, control the temperature of the nitrogen layer to -190°C, control the temperature of the oxygen layer to -180°C, and fractionate nitrogen and oxygen;

[0019] (3) Preparation of nitric oxide: pass the nitrogen and oxygen obtained in step (2) into the nitric oxide production tank, control the inflow volume ratio of nitrogen and oxygen to 1:1, connect the voltage, and control the pressure to 1.5 Mark the atmospheric pressure, collect the product to obtain nitric oxide, and control the reaction time to 15 minutes;

[0020] (4) Preparation of nitrogen dioxide: pass nitrogen monoxide and oxygen into the nitrogen dioxide production tank, control the volume ratio of nitrogen monoxide and oxygen to 1:2, and react to produce n...

Embodiment 2

[0022] Example 2: The rest is the same as that of Example 1, except that the control pressure in the step (3) is 1 marked atmospheric pressure, the control reaction time is 10 min, and the control pressure in the step (5) is 20KPa.

Embodiment 3

[0023] Example 3: The rest is the same as that of Example 1, except that the control pressure in step (3) is 2 marked atmospheres, the control reaction time is 20 minutes, and the control pressure in step (5) is 30KPa.

[0024] In above-mentioned three embodiments, through compressed air, then prepare nitrogen monoxide and nitrogen dioxide step by step, finally obtain nitric acid, carry out test and record, the nitric acid of making does not contain any impurity, after spraying, acidity can reach arbitrary Value, the raw material utilization rate is as high as 90%.

[0025] It can be seen from the practical application of the present invention that the nitric acid produced through the five steps of compressing air, fractionating, preparing nitric oxide, preparing nitrogen dioxide, and spraying not only has a wide range of raw material sources, but also produces by-products that do not pollute the environment, and the raw materials can be recycled. , the preparation process i...

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Abstract

The invention discloses a production technology of nitric acid and belongs to the field of nitric acid preparation. The production technology comprises the following steps: (1) air compression; (2) fractionation; (3) preparation of nitric oxide; (4) preparation of nitrogen dioxide; and (5) spray: nitrogen dioxide prepared in the step (4) is introduced into a spray tower, a sprayed liquid is clear water, pressure is controlled to 20-30 KPa, nitric acid is prepared, and generated gas is introduced into a nitrogen dioxide preparation tank in the step (4). Sources of raw materials are wide. In addition, generated by-products cause no pollution to the environment, and raw materials can be recycled. The preparation technology is simple. The prepared nitric acid has high quality and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of nitric acid preparation, and in particular relates to a production process of nitric acid. Background technique [0002] Nitric acid is a strong oxidizing and corrosive acid. Nitric acid is easily soluble in water, and its solution is colorless and transparent at room temperature. The properties of different concentrations of aqueous solutions are different. The commercially available concentrated nitric acid is an azeotropic solution with a mass fraction of 69.2% (about 16mol / L); if the mass fraction is large enough (the commercially available concentration is up to 98%), it is called fuming nitric acid. , nitric acid is easy to decompose under light, and should be stored in a brown bottle in a dark place away from light. It is strictly forbidden to contact with reducing agents. Nitric acid is mainly produced by ammonia oxidation in industry, and is used to make fertilizers, explosives, nitrates, etc. In organic c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/40
Inventor 陈国平夏方方杜成铭陈丽庆王霞张梁吴涛英荆吉仁夏新开王海大
Owner 丹阳恒安化学科技研究所有限公司
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