High-purity hydrochloric acid production process

A production process, high-purity hydrochloric acid technology, applied in the direction of chlorine/hydrogen chloride, hydrogen chloride preparation, etc., can solve the problems of reducing equipment life, reducing the quality of secondary brine, and breaking ion exchange resins, achieving obvious advantages, improving service life, and increasing The effect of economic benefits

Inactive Publication Date: 2019-04-26
张凤芹
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

In the existing hydrochloric acid production process, the mass fraction of free chlorine in hydrochloric acid remains high, sometimes up to 2×10 -4 , which restricts the application of hydrochloric acid to a large extent. For example, free chlorine has a strong oxidizing ability. If hydrochloric acid with high free chlorine content enters the resin exchange tower, it will cause oxidation of the resin, and even make it lose its activity and cannot be regenerated. It will also lead to the fragmentation of the ion exchange resin, which will eventually lead to the reduction of the quality of the secondary brine and shorten the life of the ion membrane. In addition, the iron content in hydrochloric acid exceeds the standard seriously, which greatly affects the normal operation of the equipment in the caustic soda industry and reduces the life of the equipment. Therefore provide a kind of production technique of high-purity hydrochloric acid, to solve the above technical problems

Method used

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  • High-purity hydrochloric acid production process

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Effect test

Embodiment 1

[0023] The production technology of embodiment 1 high-purity hydrochloric acid, with reference to figure 1 , including the following steps:

[0024] (1) The raw chlorine and hydrogen with a purity of 99% enter from the top of the synthesis furnace respectively. The chlorine and hydrogen are burned on the combustion platform of the synthesis furnace to produce white hydrogen chloride gas. The hydrogen chloride gas enters the cooling absorption tower from the top of the furnace and is cooled by water. When the temperature drops to 55°C, the water in the cooling tower absorbs hydrogen chloride gas to generate hydrochloric acid with a concentration of 31%, which flows into the hydrochloric acid storage tank; among them, the water in the cooling tower is steam condensed water, which is continuously added. Add to cooling absorption tower through lift pump and water jet pump;

[0025] (2) According to the content of free chlorine in the hydrochloric acid storage tank, prepare a sodi...

Embodiment 2

[0027] The production technology of embodiment 2 high-purity hydrochloric acid, with reference to figure 1 , including the following steps:

[0028] (1) The raw chlorine and hydrogen with a purity of 99% enter from the top of the synthesis furnace respectively. The chlorine and hydrogen are burned on the combustion platform of the synthesis furnace to produce white hydrogen chloride gas. The hydrogen chloride gas enters the cooling absorption tower from the top of the furnace and is cooled by water. When the temperature drops to 50°C, the water in the cooling tower absorbs hydrogen chloride gas to generate hydrochloric acid with a concentration of 31%, which flows into the hydrochloric acid storage tank; among them, the water in the cooling tower is steam condensed water, which is continuously added. Add to cooling absorption tower through lift pump and water jet pump;

[0029] (2) According to the content of free chlorine in the hydrochloric acid storage tank, prepare a sodi...

Embodiment 3

[0031] The production technique of embodiment 3 high-purity hydrochloric acid, with reference to figure 1 , including the following steps:

[0032] (1) The raw chlorine and hydrogen with a purity of 99% enter from the top of the synthesis furnace respectively. The chlorine and hydrogen are burned on the combustion platform of the synthesis furnace to produce white hydrogen chloride gas. The hydrogen chloride gas enters the cooling absorption tower from the top of the furnace and is cooled by water. When the temperature drops to 50°C, the water in the cooling tower absorbs hydrogen chloride gas to generate hydrochloric acid with a concentration of 31%, which flows into the hydrochloric acid storage tank; among them, the water in the cooling tower is steam condensed water, which is continuously added. Add to cooling absorption tower through lift pump and water jet pump;

[0033] (2) According to the content of free chlorine in the hydrochloric acid storage tank, prepare a sodiu...

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Abstract

The invention discloses a high-purity hydrochloric acid production process. The high-purity hydrochloric acid production process comprises the steps that chlorine gas and hydrogen gas are burnt on a combustion table of a synthesis furnace to generate white hydrogen chloride gas, and water in a cooling tower absorbs the hydrogen chloride gas to generate hydrochloric acid with the concentration of 31%; a sodium sulfite solution is dripped from the top of a hydrochloric acid storage tank through a dropping tank and fully reacted with free chlorine; and the processed hydrochloric acid solution enters a resin tower, and after the tower is filled with the acid liquid, excess iron is removed by adsorption to obtain high-purity hydrochloric acid which meets the production requirements. The high-purity hydrochloric acid production process can effectively reduce the content of the free chlorine and the iron in the hydrochloric acid, so that the prepared high-purity hydrochloric acid can meet theprocess condition requirements of a membrane process for producing alkali, the service life of a subsequent reaction device is prolonged, the economic benefit of a company is increased, and obvious advantages are achieved.

Description

technical field [0001] The invention relates to a production process of hydrochloric acid, in particular to a production process of high-purity hydrochloric acid. Background technique [0002] Hydrochloric acid is a colorless or light yellow transparent liquid, volatile, has a pungent odor, is highly corrosive, and is easily soluble in water, alcohol and ether. It can chemically react with metals other than precious metals, and can react chemically with metal oxides, alkalis and most salts. [0003] It is not only useful in ionic membrane caustic soda, but also used in the production of high-purity products such as medicine. In the food industry, it can be used to make condiments such as monosodium glutamate and soy sauce, and to make hydrolyzed alcohol and glucose from starch; it can be used as a decomposition accelerator for bleaching powder liquid in the bleaching of fiber plants in the textile industry; it can be used in the chemical industry to produce inorganic chlori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/01
CPCC01B7/012
Inventor 张凤芹
Owner 张凤芹
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