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[Chemical Knowledge]：Production and manufacturing method and process of potassium sulfate

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The manufacturing method
of potassium sulfate
1. Introduction

potassium sulfate is an important inorganic chemicals, widely used in agriculture, medicine, food and other fields. In the field of raw materials for chemical production, the production method of potassium sulfate has attracted much attention. This article will introduce the manufacturing methods of potassium sulfate, including Mannheim method, neutralization method and ion exchange method.

2. Mannheim method

The Mannheim method is a commonly used potassium sulfate manufacturing method. The principle is that in the reaction of sulfuric acid and potassium chloride, alkaline absorbents such as potassium carbonate or potassium hydroxide are added to react with the hydrochloric acid generated by the reaction to obtain potassium sulfate.

specific steps are as follows:

1. mix potassium chloride and sulfuric acid according to a certain proportion, and react to generate potassium bisulfate and hydrochloric acid.

2. An alkaline absorbent such as potassium carbonate or potassium hydroxide is added to the reaction solution and allowed to react with hydrochloric acid to produce potassium chloride and carbon dioxide or water.

3. Filter, wash, and dry to obtain potassium sulfate product.

Mannheim method has the advantages of simple process, convenient operation and low cost, it will produce a large amount of waste gas and waste water, which will cause some pollution to the environment.

3. neutralization method

neutralization method is an improved potassium sulfate manufacturing method. Its principle is to add alkaline absorbent in the reaction of sulfuric acid and potassium chloride to react with the potassium hydrogen sulfate generated by the reaction to generate potassium sulfate and hydrogen chloride, and then separate hydrogen chloride by distillation to obtain potassium sulfate product.

specific steps are as follows:

1. mix potassium chloride and sulfuric acid according to a certain proportion, and react to generate potassium bisulfate and hydrochloric acid.

2. An alkaline absorbent such as sodium carbonate or sodium hydroxide is added to the reaction solution to react with potassium hydrogen sulfate to produce potassium sulfate and hydrogen chloride.

3. hydrogen chloride is separated by distillation to obtain potassium sulfate product.

neutralization method has the advantages of reducing exhaust gas and wastewater discharge and improving product quality, but the process is more complex and the cost is higher.

4. ion exchange method

ion exchange method is a relatively new potassium sulfate manufacturing method, the principle is the use of ion exchange agent in the ion and potassium sulfate solution in the ion exchange, so as to obtain a higher purity of potassium sulfate products.

specific steps are as follows:

1. potassium sulfate solution through ion exchanger, the potassium ion and ion exchanger in the sodium ion exchange, generating sodium sulfate and potassium chloride.

2. potassium chloride solution through another ion exchanger, the sodium ion and ion exchanger in the exchange of hydrogen ions, sodium hydroxide and hydrogen chloride.

3. mix sodium sulfate and sodium hydroxide solution and react to produce potassium sulfate and sodium hydroxide.

4. through evaporation, crystallization, drying and other processes to obtain potassium sulfate products.

ion exchange method has the advantages of high product purity, simple operation and low environmental pollution, but the equipment investment is large and the cost is high.

5. Conclusion There are many manufacturing methods for

potassium sulfate, including Mannheim method, neutralization method and ion exchange method. Each method has its advantages and disadvantages and application scope, and the selection of the appropriate manufacturing method needs to be considered comprehensively according to the specific situation. In the future, with the continuous progress of science and technology and the improvement of environmental awareness, the manufacturing method of potassium sulfate will continue to be improved and optimized.

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