Method for preparing hydrogen chloride and ammonia by utilizing ammonium chloride

A technology of ammonium chloride and hydrogen chloride, applied in the direction of chlorine/hydrogen chloride, preparation with chloride, preparation/separation of ammonia, etc., can solve the problem of low reaction rate of acid release, lack of proper control of the particle size of raw material ammonium chloride, and insufficient purity Advanced problems, to achieve the effect of improving reaction rate and reaction efficiency, avoiding ammonia synthesis process, and avoiding side reactions

Active Publication Date: 2011-04-13
YIBIN TIANYUAN GRP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One is that the particle size of the raw material ammonium chloride is not properly controlled, resulting in a low conversion rate in the acid reaction process;
[0008] The 2nd, the reaction rate of releasing acid is low, causes ammonium chloride volatilization loss more, and then causes the hydrogen chloride gas that generates to be mixed with ammonium chloride and the purity is not high;
[0009] The third is that the reactions of the acid release process and the ammonia release process are all reversible reactions. In the process of preparing hydrogen chloride, ammonium sulfate has an inhibitory effect on the reaction. At the same time, in the process of preparing ammonia gas, ammonium bisul

Method used

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  • Method for preparing hydrogen chloride and ammonia by utilizing ammonium chloride
  • Method for preparing hydrogen chloride and ammonia by utilizing ammonium chloride

Examples

Experimental program
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Effect test

Embodiment 1

[0034] like figure 1 Shown, a kind of ammonium chloride produces the method for hydrogen chloride and ammonia, comprises the following steps:

[0035] 1. Acid release reaction process

[0036] During the acid release reaction, first add the intermediate separation inorganic acidic solvent ammonium bisulfate to the reaction kettle, and then add the dried and sieved solid ammonium chloride and hydrogen sulfate with a particle size of 40 meshes under stirring conditions. The molar ratio of ammonium to ammonium chloride is 1:1. At this time, a large amount of hydrogen chloride gas is produced. After 2 hours of constant temperature reaction, the conversion rate of ammonium chloride reaches 90.5%. The hydrogen chloride gas produced has a purity of 91.8% without treatment and can be used after treatment In the production or preparation of high-purity hydrochloric acid in PVC, the remaining ammonium bisulfate and ammonium sulfate are crystallized and separated;

[0037] 2. Intermedi...

Embodiment 2

[0042] A method for ammonium chloride to produce hydrogen chloride and ammonia, comprising the following steps:

[0043] 1. Acid release reaction process

[0044]During the acid release reaction, first add the intermediate separation inorganic acidic solvent ammonium bisulfate to the reaction kettle, after heating up to 250°C, add the dried and sieved solid ammonium chloride with a particle size of 100 mesh, hydrogen sulfate The molar ratio of ammonium to ammonium chloride is 5:1. At this time, a large amount of hydrogen chloride gas is produced. After 2 hours of constant temperature reaction, the conversion rate of ammonium chloride reaches 91.5%. The hydrogen chloride gas produced has a purity of 93.2% without treatment and can be used after treatment In the production or preparation of high-purity hydrochloric acid in PVC, the remaining ammonium bisulfate and ammonium sulfate are crystallized and separated;

[0045] 2. Intermediate separation process

[0046] The molten m...

Embodiment 3

[0050] A method for ammonium chloride to produce hydrogen chloride and ammonia, comprising the following steps:

[0051] 1. Acid release reaction process

[0052] During the acid release reaction, first add the intermediate separation inorganic acidic solvent ammonium bisulfate to the reaction kettle, after heating up to 220°C, add the dried and sieved solid ammonium chloride with a particle size of 60 mesh, hydrogen sulfate The molar ratio of ammonium to ammonium chloride is 3:1. At this time, a large amount of hydrogen chloride gas is produced. After 2 hours of constant temperature reaction, the conversion rate of ammonium chloride reaches 90.8%. The hydrogen chloride gas produced has a purity of 92.6% without treatment and can be used after treatment In the production or preparation of high-purity hydrochloric acid in PVC, the remaining ammonium bisulfate and ammonium sulfate are crystallized and separated;

[0053] 2. Intermediate separation process

[0054] The molten m...

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Abstract

The invention discloses a method for preparing hydrogen chloride and ammonia by utilizing ammonium chloride, belonging to the field of recycling of ammonium chloride. The method comprises: excessive ammonium bisulphate is taken as reaction intermediate, firstly hydrogen chloride is prepared, ammonium sulphate and ammonium bisulphate which are obtained by reaction are added into an alcoholic solution, crystallization and separation are carried out, the separated ammonium sulphate is decomposed to obtain the ammonia and ammonium bisulphate, and the ammonium bisulphate reacts with the ammonium chloride to prepare hydrogen chloride gas. Ammonium bisulphate and alcoholic solvent can be recycled in the reaction process, excessive ammonium bisulphate can be added during the hydrogen chloride preparation process, thus not only the molten material system is ensured to have good fluidity and be fully contacted with the ammonium chloride, so as to speed up reaction, but also the ammonium chloride sublimation amount is reduced, the hydrogen chloride gas purity is improved, the intermediate separation step is added, the reaction speed and the reaction efficiency are improved, and the acid release reaction and the ammonium release reaction can be carried out stably.

Description

technical field [0001] The invention relates to a method for recycling ammonium chloride, in particular to a method for preparing hydrogen chloride and ammonia from ammonium chloride. Background technique [0002] Ammonium chloride is one of the two major products of the combined soda production process. In recent years, with the development of the soda ash industry, ammonium chloride has increased day by day. Due to the restrictions on the application of chemical fertilizers, it has been too late to find a suitable way out and there is a large surplus. It has become the bottleneck of the soda ash industry, and it is urgent to find a suitable utilization method. At the same time, the soda-making industry is inseparable from the synthetic ammonia industry. With the increase in energy prices in the process of synthetic ammonia production, the cost of the soda-making industry has also increased. If ammonium chloride is decomposed into hydrogen chloride and ammonia gas, not onl...

Claims

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Application Information

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IPC IPC(8): C01B7/05C01C1/02
Inventor 罗云陈洪孙永贵雷丹周高明邢德政
Owner YIBIN TIANYUAN GRP CO LTD
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