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Process for preparing concentrated nitric acid through dilute nitric acid and dehydrant

A technology of dilute nitric acid and concentrated nitric acid, applied in nitric acid, nitrogen oxides/oxo acids, energy input, etc., can solve problems such as unstable operation, unqualified nitric acid, complicated preparation process, etc., and achieve energy consumption disclosure, The effect of stable operation and simple process

Inactive Publication Date: 2019-05-24
宁夏润夏能源化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In modern industry, the preparation of nitric acid is extremely important, but the traditional preparation process is complicated, the operation is unstable, and the prepared nitric acid often does not meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The present invention proposes a kind of technique that dilute nitric acid adds dehydrating agent to prepare concentrated nitric acid, comprises the steps:

[0021] S1: First prepare the magnesium nitrate solution, add desalted water into the magnesium nitrate tank, heat it to 60°C with low-pressure steam, then slowly add solid magnesium nitrate into the tank, and stir with compressed air at the same time, the concentration of magnesium nitrate reaches 40 % is sent to the magnesium nitrate evaporation process;

[0022] S2: Prepare dilute nitric acid, use the ammonia oxidation method to produce dilute nitric acid, pass the mixed gas of ammonia and air into the hot platinum-rhodium alloy mesh, under the catalysis of the alloy mesh, ammonia is oxidized into nitric oxide, and the resulting monoxide Nitrogen is continuously oxidized to nitrogen dioxide by utilizing the residual oxygen after the reaction, and then the nitrogen dioxide is passed into water to produce nitric ac...

Embodiment 2

[0034] The present invention proposes a kind of technique that dilute nitric acid adds dehydrating agent to prepare concentrated nitric acid, comprises the steps:

[0035] S1: First prepare the magnesium nitrate solution, add desalted water into the magnesium nitrate tank, heat it to 90°C with low-pressure steam, then slowly add solid magnesium nitrate into the tank, and stir with compressed air at the same time, the concentration of magnesium nitrate reaches 50 % is sent to the magnesium nitrate evaporation process;

[0036] S2: Prepare dilute nitric acid, use the ammonia oxidation method to produce dilute nitric acid, pass the mixed gas of ammonia and air into the hot platinum-rhodium alloy mesh, under the catalysis of the alloy mesh, ammonia is oxidized into nitric oxide, and the resulting monoxide Nitrogen is continuously oxidized to nitrogen dioxide by utilizing the residual oxygen after the reaction, and then the nitrogen dioxide is passed into water to produce nitric ac...

Embodiment 3

[0048] The present invention proposes a kind of technique that dilute nitric acid adds dehydrating agent to prepare concentrated nitric acid, comprises the steps:

[0049] S1: First prepare the magnesium nitrate solution, add desalted water into the magnesium nitrate tank, heat it to 70°C with low-pressure steam, then slowly add solid magnesium nitrate into the tank, and stir with compressed air at the same time, the concentration of magnesium nitrate reaches 45 % is sent to the magnesium nitrate evaporation process;

[0050] S2: Prepare dilute nitric acid, use the ammonia oxidation method to produce dilute nitric acid, pass the mixed gas of ammonia and air into the hot platinum-rhodium alloy mesh, under the catalysis of the alloy mesh, ammonia is oxidized into nitric oxide, and the resulting monoxide Nitrogen is continuously oxidized to nitrogen dioxide by utilizing the residual oxygen after the reaction, and then the nitrogen dioxide is passed into water to produce nitric ac...

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PUM

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Abstract

The invention discloses a process for preparing concentrated nitric acid through dilute nitric acid and a dehydrant. The process comprises the step of S1, preparing magnesium nitrate liquid; S2, preparing dilute nitric acid; S3, delivering the dilute nitric acid of step S2 to a dilute nitric acid high tank, and allowing the dilute nitric acid to pass through a dilute nitric acid flowmeter and enter a mixer; S4, based on the step S3, acquiring nitric acid vapor with the content of 80-90% from a stripping segment of a concentrating column; S5, evaporating magnesium nitrate; S6, allowing nitratevapor from the step S5 to enter an acid separator. The four procedures of magnesium nitrate liquid preparation, dilute nitric acid concentration, concentrated nitric acid bleaching and magnesium nitrate evaporating are applied in the process; the process is simple, energy consumption is low, investment is low, operational stability is good, and the process is good in safety and reliability.

Description

technical field [0001] The invention relates to the technical field of concentrated nitric acid preparation, in particular to a process for preparing concentrated nitric acid by adding dilute nitric acid and a dehydrating agent. Background technique [0002] Nitric acid is a strong oxidizing and corrosive acid, which belongs to the monobasic inorganic strong acid, is one of the six major inorganic strong acids, and is also an important chemical raw material. In industry, it can be used to make chemical fertilizers, pesticides, explosives, dyes, salts, etc.; in organic chemistry, the mixture of concentrated nitric acid and concentrated sulfuric acid is an important nitrating reagent, and its aqueous solution is commonly known as nitrate water or ammonia nitrogen water. In modern industry, the preparation of nitric acid is extremely important, but the traditional preparation process is complicated, the operation is unstable, and the prepared nitric acid often does not meet the...

Claims

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Application Information

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IPC IPC(8): C01B21/44C01B21/40
CPCY02P20/129
Inventor 杨超吴磊柏发路刘伟
Owner 宁夏润夏能源化工有限公司
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