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[Chemical Knowledge]：The production and manufacturing method and process of urine base.

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The manufacturing method
of urine-based
in the field of chemical production raw materials, urine-based is an important organic compound, widely used in pesticides, pharmaceuticals, dyes and other industries. This article will introduce the manufacturing method of urine base, including raw material preparation, reaction process, post-treatment and so on.

1. Raw Material Preparation

The main raw materials for the manufacture of urine base are urea and formaldehyde. Urea is a common nitrogen fertilizer that can be produced by the reaction of synthetic ammonia and carbon dioxide. Formaldehyde is a colorless, pungent odor gas, can be obtained by the oxidation of methanol.

2. reaction process

1. Urea and formaldehyde reaction
Urea and formaldehyde are mixed according to a certain molar ratio, adding an appropriate amount of catalyst, such as hydrochloric acid or sulfuric acid, to control a certain temperature and pH value, so that urea and formaldehyde condensation reaction occurs to generate hydroxymethyl urea.
2. Hydroxymethyl Urea Dehydration
Hydroxymethyl Urea Dehydration reaction occurs at a certain temperature to generate urine base. This process requires appropriate temperature and time control to ensure the yield and purity of the urine base.

3. post-treatment
After the end of the
reaction, the reaction solution needs to be post-treated to obtain a urine-based product with higher purity. The post-treatment process includes:

1. neutralization: adding an alkaline absorbent to the reaction solution, allowing it to react with the residual acidic catalyst, and adjusting the pH value to neutral.
2. decolorization: add appropriate amount of activated carbon, pigment and impurities in the adsorption reaction liquid, improve the purity of urine base.
3. Filtration: Solid impurities in the reaction liquid, such as unreacted raw materials and by-products, are removed by filtration.
4. Crystallization: The filtered solution was subjected to cooling crystallization to obtain crystals of uryl.
5. Drying: The urine-based crystals are dried to remove water and other volatile substances.

Through the above steps, a urine-based product of higher purity can be produced.

4. precautions

1. Control the reaction temperature and pH value: In the reaction process of urea and formaldehyde, it is necessary to control the appropriate temperature and pH value to ensure the smooth progress of the reaction and the yield of urea.
2. Prevent the occurrence of side reactions: In the process of manufacturing urine base, some side reactions may occur and some impurities may be generated. Therefore, it is necessary to select appropriate catalysts and reaction conditions to reduce the occurrence of side reactions.
3. pay attention to safety: formaldehyde is a toxic and harmful gas, harmful to human health. In the process of manufacturing urine base, it is necessary to pay attention to safety measures to avoid formaldehyde leakage and contact.

In short, the manufacturing method of urine base includes raw material preparation, reaction process and post-treatment. In the manufacturing process, attention should be paid to controlling the reaction conditions, preventing the occurrence of side reactions and paying attention to safety measures to ensure the yield and purity of the urea base.

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