Manufacturing method of formaldehyde
I. Introduction
Formaldehyde is an important organic chemical raw material, widely used in the production of phenolic resins, urea-formaldehyde resins, vinyl alcohol, urotropin, pentaerythritol, dyes, pesticides and disinfectants. In the field of raw materials for chemical production, the manufacturing method of formaldehyde has attracted much attention. In this paper, we will introduce a method to obtain formaldehyde by oxidation method using methanol as raw material.
2. Raw materials and principle
1. Raw materials: methanol, air, water.
2. Principle: Methanol, under a certain temperature and pressure, oxidizes with oxygen in air to produce formaldehyde and water through the action of catalyst.
3. Process flow
1. Dosing: Add methanol, water and catalyst into the oxidation reactor in a certain proportion.
2. Oxidation reaction: under certain temperature and pressure, pass air to make methanol and oxygen oxidation reaction to generate formaldehyde and water.
3. Cooling and Absorption: After cooling the reaction product, it enters the absorption tower and absorbs formaldehyde with water to produce a formaldehyde aqueous solution.
4. Distillation: The formaldehyde aqueous solution is distilled to get high concentration of formaldehyde product.
Four, operation points
1. Control the reaction temperature: too high a temperature will lead to an increase in side reactions, too low a temperature will affect the reaction rate. Therefore, it is necessary to strictly control the reaction temperature within the appropriate range.
2. Control air flow: too large an air flow will lead to excessive oxidation, and too small a flow will affect the progress of the reaction. It needs to be adjusted according to the reaction situation.
3. Selection and activation of catalyst: select suitable catalyst and activate it to improve the reaction rate and selectivity.
4. Maintenance and upkeep of equipment: Regularly check, clean and maintain the equipment to ensure its normal operation.
V. Safety and environmental protection measures
1. Strictly implement the operation regulations and ensure that employees are familiar with the safety operation regulations and emergency treatment measures.
2. Equipped with perfect safety facilities, such as fire prevention equipment, gas masks, etc., to ensure the safety of employees in the production process.
3. Strengthen the management of waste water, waste gas, waste residue and other wastes to ensure that they are discharged up to the standard and reduce the pollution to the environment.
Sixth, economic benefit analysis
The method of obtaining formaldehyde by oxidation method with methanol as raw material has high economic benefits. Firstly, the price of methanol is relatively low, which reduces the production cost; secondly, the oxidation method has high reaction selectivity, which can get higher concentration of formaldehyde products and improve the product quality; finally, the method is easy to operate and easy to realize industrial production, which is conducive to improving the production efficiency.
VII.CONCLUSION
The method of obtaining formaldehyde by oxidation method with methanol as raw material has the advantages of easy availability of raw materials, simple operation and high economic benefits, which is a more ideal method of formaldehyde manufacturing. In the actual production process, it is necessary to strictly control the reaction conditions and strengthen the safety and environmental protection management to ensure that the production goes smoothly, and at the same time improve product quality, reduce production costs, and create better economic and social benefits for the enterprise.
