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Benzoic acid, also known as benzoic acid, has a molecular formula of C6H5COOH, which is a compound formed by substituting a hydrogen on a benzene ring with a carboxyl group (-COOH).
The normal temperature is a scaly or needle-like crystal having an odor of benzene or formaldehyde.
Its vapor is very irritating and can cause coughing after inhalation. Slightly soluble in water, soluble in organic solvents such as ethanol and ether.
Benzoic acid is a weak acid and stronger than fatty acids.
Their chemical properties are similar, and they all form salts, esters, acid halides, amides, acid anhydrides, etc., which are not easily oxidized.
An electrophilic substitution reaction can occur on the benzene ring of benzoic acid, and a meta-substituted product is mainly obtained.
Benzoic acid is widely found in nature in the form of free acids, esters or derivatives thereof.
Benzoic acid is generally used as a medicine or a preservative, and has the effect of inhibiting the growth of fungi, bacteria, and mold. It is usually applied to the skin during medicinal use to treat skin diseases of mites.
Used in synthetic fibers, resins, coatings, rubber, and tobacco industries.
Initially, benzoic acid is prepared by dry distillation of benzoin or alkaline water, and can also be obtained by hydrolysis of hippuric acid.
Industrial benzoic acid is obtained by oxidizing toluene with air in the presence of a catalyst such as cobalt or manganese; or by decarboxylation of phthalic anhydride. Benzoic acid and its sodium salt can be used as bacteriostatic agents for latex, toothpaste, jam or other foods, as well as mordants for dyeing and printing