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[Chemical Knowledge]：Formaldehyde (37%) production and manufacturing methods and processes.

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Formaldehyde Manufacturing Method

1. Introduction

Formaldehyde is an important organic chemical raw material, widely used in phenolic resin, urea-formaldehyde resin, vinylon, ulotropine, pentaerythritol, dyes, pesticides and disinfectants production. In the field of chemical production raw materials, the manufacturing method of formaldehyde has attracted much attention. This paper will introduce a method of producing formaldehyde by oxidation with methanol as raw material.

2. raw materials and the principle of

1 raw materials: methanol, air, water.
2. Principle: Methanol reacts with oxygen in the air to produce formaldehyde and water through the action of a catalyst at a certain temperature and pressure.

3. Process

1. ingredients: methanol, water and catalyst are added to the oxidation reactor in a certain proportion.
2. Oxidation reaction: Under a certain temperature and pressure, air is introduced to make methanol and oxygen oxidize to produce formaldehyde and water.
3. Cooling and absorption: After the reaction product is cooled, it enters the absorption tower and absorbs formaldehyde with water to generate an aqueous solution of formaldehyde.
4. Distillation: Distillation of the aqueous solution of formaldehyde to obtain a high concentration of formaldehyde products.

4. operating points

1. control the reaction temperature: the temperature is too high will lead to increased side reactions, the temperature is too low will affect the reaction rate. Therefore, it is necessary to strictly control the reaction temperature within an appropriate range.
2. Control air flow: excessive air flow will lead to excessive oxidation, flow is too small will affect the reaction schedule. It needs to be adjusted according to the reaction.
3. Catalyst selection and activation: select the appropriate catalyst and its activation treatment, in order to improve the reaction rate and selectivity.
4. Equipment maintenance and maintenance: regular inspection, cleaning and maintenance of the equipment to ensure the normal operation of the equipment.

5. safety and environmental protection measures

1. Strictly implement the operation procedures to ensure that employees are familiar with the safety operation procedures and emergency treatment measures.
2. Equipped with complete safety facilities, such as fire prevention equipment, gas masks, etc., to ensure the safety of employees in the production process.
3. Strengthen the treatment of waste water, waste gas, waste residue and other wastes to ensure that they meet the discharge standards and reduce environmental pollution. The economic benefit analysis of

6.

the method of using methanol as raw material to produce formaldehyde by oxidation has high economic benefit. First of all, the price of methanol is relatively low, which reduces the production cost; secondly, the oxidation method has a high reaction selectivity, can obtain a higher concentration of formaldehyde products, improve product quality; finally, the method is simple to operate, easy to realize industrial production, is conducive to improving production efficiency.

7. conclusion

with methanol as raw material, the method of preparing formaldehyde by oxidation method has the advantages of easy access to raw materials, simple operation and high economic benefits, which is an ideal formaldehyde manufacturing method. In the actual production process, it is necessary to strictly control the reaction conditions and strengthen the safety and environmental protection management to ensure the smooth progress of production, while improving product quality, reducing production costs, and creating better economic and social benefits for enterprises.

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