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[Chemical Knowledge]：Production method and process of melamine

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of Melamine Manufacturing Method
Melamine is an important raw material for chemical production, which is widely used in plastics, coatings, adhesives, paper processing and other fields. This article will introduce the manufacturing method of melamine in detail.

1. manufacturing principle

The manufacture of melamine is realized by the hydrolysis and condensation reaction of cyanamide. Specifically, cyanamide undergoes a hydrolysis reaction under acidic conditions to generate aminonitrile, which is further condensed into melamine.

2. Manufacturing Steps

1. Preparation of Cyanamide

First, it is necessary to prepare cyanamide. Cyanamide can be made by reacting lime nitrogen with sulfuric acid. The specific steps are as follows:

(1) lime nitrogen and sulfuric acid are mixed in a certain proportion to react to generate calcium cyanate.

(2) decomposes calcium cyanate with water to produce cyanamide and calcium sulfate precipitate.

(3) Cyanamide was separated from the reaction solution by distillation.

2. cyanamide hydrolysis

The prepared cyanamide is added into the acidic hydrolysis solution, and the temperature and pH value are controlled to make the cyanamide hydrolyze to produce aminonitrile.

3. condensation reaction

hydrolysis of aminonitrile under alkaline conditions to produce melamine. This process requires a certain temperature and pH control to promote the reaction.

4. Crystallization and Separation

After completion of the reaction, melamine was crystallized from the reaction solution by cooling crystallization. The melamine is then separated from the mother liquor by filtration, washing, drying and other steps to obtain a pure melamine product.

3. precautions

1. In the entire manufacturing process, it is necessary to strictly control the reaction temperature, pH and other parameters to ensure the smooth progress of the reaction.

2. In order to ensure the purity of the product, it is necessary to conduct comprehensive quality inspection and control of raw materials, intermediates and final products.

4. Application and Development

Melamine as an important chemical raw material has been widely used in various fields. With the continuous development of science and technology, the production process of melamine is also constantly improving, and the production efficiency and product purity are constantly improving. In the future, with the continuous emergence of new materials and technologies, the application prospect of melamine in the field of chemical production will be broader.

5. safety and environmental protection

In the melamine manufacturing process, it is necessary to strictly abide by the safety operation procedures to ensure the safety of employees and equipment. At the same time, it is necessary to strengthen the treatment and recycling of waste water, waste gas and other wastes to reduce the impact on the environment.

In short, the manufacture of melamine needs to go through multiple steps and links, and various parameters and indicators need to be strictly controlled to ensure the quality and purity of the product. At the same time, we should pay attention to safety and environmental protection in the production process to promote the sustainable development of the chemical industry.

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