The manufacturing method of urea: Introduction: Urea is an important chemical product widely used in agriculture, medicine, plastics, coatings, and other fields. In the field of raw materials for chemical production, the manufacturing method of urea has attracted much attention. This article will introduce the manufacturing methods of urea, including ammonification method, ammonium bicarbonate method, direct synthesis method, etc., and analyze their advantages and disadvantages, in order to provide readers with reference
2、 The properties and uses of urea
Urea is a white crystalline powder, odorless, and easily soluble in water. It has a high nitrogen content and is a commonly used nitrogen fertilizer. In addition, urea has multiple uses and can be used as an animal feed additive, pharmaceutical intermediate, plastic raw material, etc
3、 The manufacturing method of urea
1 Ammoniation method is the process of mixing ammonium carbonate or ammonium bicarbonate with ammonia water and reacting at a certain temperature and pressure to produce urea and carbon dioxide. This method is divided into high-pressure method and low-pressure method. The high-pressure method requires reaction at higher pressure, while the low-pressure method is carried out at lower pressure. The ammonification method has advantages such as easy availability of raw materials and simple operation, but it has high energy consumption and generates a large amount of carbon dioxide during the production process
2. Ammonium bicarbonate method
Ammonium bicarbonate method is the reaction between ammonium bicarbonate and ammonia water at a certain temperature to produce urea, water, and carbon dioxide. This method has the advantages of easy availability of raw materials and mild reaction conditions, but the production process requires a large amount of energy consumption and generates a large amount of exhaust gas and wastewater
3. Direct synthesis method
Direct synthesis method is the direct synthesis of urea from ammonia and carbon dioxide under certain temperature, pressure, and catalyst action. This method has the advantages of low energy consumption, low pollution, and high yield, and has become the mainstream method for urea production at present
4、 Analysis of advantages and disadvantages of manufacturing methods
1 Advantages of ammonification method: Easy to obtain raw materials and simple operation. Disadvantage: High energy consumption, producing a large amount of carbon dioxide
2. Advantages of ammonium bicarbonate method: Easy to obtain raw materials and mild reaction conditions. Disadvantages: High energy consumption, generating a large amount of exhaust gas and wastewater
3. Advantages of direct synthesis method: low energy consumption, low pollution, and high yield. Disadvantage: High equipment requirements, requiring catalysts
5、 Conclusion: There are various methods for manufacturing urea, including ammonification, ammonium bicarbonate, direct synthesis, etc. All methods have their advantages and disadvantages, and suitable manufacturing methods should be selected according to the actual situation. The direct synthesis method has become the mainstream method for urea production due to its advantages of low energy consumption, low pollution, and high yield. In the actual production process, factors such as raw material sources, energy consumption, and environmental requirements should be fully considered to improve the production and economic benefits of urea. At the same time, we will strengthen technological innovation and research and development to promote the green and sustainable development of the urea manufacturing industry.
