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[Chemical Knowledge]：Production and manufacturing method and process of m-hydroxybenzaldehyde

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The manufacturing method
of m-hydroxybenzaldehyde
m-hydroxybenzaldehyde (also known as 3-hydroxybenzaldehyde or m-hydroxybenzaldehyde) is an important organic compound, which is widely used in the field of raw materials for the production of chemicals such as medicine, pesticides, spices and dyes. The following are several common m-hydroxybenzaldehyde manufacturing methods.

method one: phenol method
phenol method is one of the common methods of manufacturing m-hydroxybenzaldehyde. The method is based on phenol as raw material, through the Friedel-Crafts acylation reaction to introduce formaldehyde into the meta-position of phenol, to obtain m-hydroxybenzaldehyde. The specific steps are as follows:

1. phenol is mixed with a catalyst (such as sulfuric acid or phosphoric acid) and heated to a certain temperature.
2. Add aqueous formaldehyde solution, control the reaction temperature and time, so that the formaldehyde acylation reaction on the meta-position of phenol.
3. After completion of the reaction, the reaction mixture was cooled, filtered, washed and dried to obtain crude m-hydroxybenzaldehyde.
4. by distillation, crystallization and other purification methods, high purity of hydroxybenzaldehyde.

method two: benzoic acid method
benzoic acid method is based on benzoic acid as raw material, through oxidation, esterification, reduction and other reaction steps to obtain m-hydroxybenzaldehyde. The specific steps are as follows:

1. Benzoic acid is mixed with a catalyst (such as sulfuric acid) and heated for oxidation to generate benzoic anhydride.
2. Benzoic anhydride is esterified with methanol to generate methyl benzoate.
3. methyl benzoate is reduced under alkaline conditions to obtain m-hydroxybenzaldehyde.
4. by distillation, crystallization and other purification methods, high purity of hydroxybenzaldehyde.

of the above two methods can produce m-hydroxybenzaldehyde, but each has its own advantages and disadvantages. The phenol method is easy to obtain raw materials, the operation is relatively simple, but the amount of waste water produced is large; the benzoic acid method has more steps, but produces less waste water, and can obtain products with higher purity. In actual production, a suitable method can be selected according to specific conditions.

No matter which method is used, the reaction conditions need to be strictly controlled to ensure product quality and yield. At the same time, waste water, waste gas and other wastes generated in the production process are effectively treated to avoid environmental pollution.

In short, the manufacturing method of m-hydroxybenzaldehyde needs to be selected and optimized according to the actual situation to ensure product quality and production efficiency.

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