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[Chemical Knowledge]：Production process and preparation method of benzoic acid

Read： 2018 Time：18months ago Source：Transform the World with Simplicity

Benzoic acid is a common organic compound, also known as a benzoate. It is a colorless crystal with an almond-like taste and is very soluble in water and some organic solvents. The chemical formula of benzoic acid is C7H6O2, which is an important chemical raw material, widely used in pharmaceutical, paint, flavor, dye and other industrial fields. This article will introduce the production process and preparation method of benzoic acid.

1. the production process of benzoic acid
There are many different methods for the production process of
benzoic acid. Below we will introduce several common methods.

1. Production of benzoic acid by dry oxidation

dry oxidation is a relatively common method for the production of benzoic acid. Its basic principle is that styrene and air are reacted and oxidized to benzoic acid under the action of a catalyst. This method has the advantages of fast reaction speed, stable product quality and low energy consumption. The specific reaction equation of

is as follows:

C6H5CH = CH2 O2 → C6H5COOH

2. Production of benzoic acid by ammonia synthesis

The ammonia synthesis is a typical redox reaction. Its basic principle is to react benzene and formaldehyde to synthesize benzoic acid under the action of catalyst and ammonia oxidant. This method can be directly synthesized from synthetic ammonia, so that the reaction temperature and the amount of catalyst used can be greatly reduced.

specific reaction equation is as follows:

C6H5 HCHO NH3 → C6H5COOH NH4Cl

3. Phthalic acid photooxidation method for the production of benzoic acid

Phthalic acid photooxidation method is a relatively new method for the production of benzoic acid. Its basic principle is to react phthalic acid with air under specific light conditions to generate benzoic acid. This method has the advantages of fast reaction speed and small amount of catalyst, but its reaction conditions are relatively harsh.

specific reaction equation is as follows:

C6H4(COOH)2 1/2O2 → C6H5COOH CO2 H2O

2. benzoic acid preparation method

benzoic acid preparation method has a variety of, below we will introduce several common methods.

1. Preparation of benzoic acid
by phthalate hydrolysis
phthalate hydrolysis is a relatively common method for the preparation of benzoic acid. Its basic principle is to hydrolyze phthalate esters with water under high temperature and high pressure to generate benzoic acid. This method has the disadvantages of high reaction temperature and low yield, but its reactants are widely available. The specific reaction equation of

is as follows:

C6H4(COOC2H5)2 2H2O → 2C6H5COOH 2 C2H5OH

2. Preparation of benzoic acid by hydrochloric acid