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Application fields of benzoic acid

Benzoic acid application

Industry

(1) Production of phenol

Benzoic acid can be oxidized in liquid phase to produce phenol. Currently, the main producing countries are the Netherlands, the United States and Canada. In recent years, Lumus has developed a process for producing phenol by gas phase oxidation of benzoic acid.

(2) Production of terephthalic acid

Terephthalic acid is one of the raw materials for the synthetic fiber polyester. Potassium benzoate undergoes a disproportionation reaction to generate potassium terephthalate and benzene. The reaction mixture is treated with acid to obtain terephthalic acid, and the by-product potassium salt can be recycled. Most of the world’s terephthalic acid is produced from paraxylene, which is much more expensive than toluene.

(3) Production of caprolactam

Caprolactam is a raw material for the production of nylon. It is produced with phenol and cyclohexane, and can also be produced with benzoic acid.

(4) Chemical intermediates

Benzoic acid can be used as an intermediate in the production of benzoates and phthalates, which are important plasticizers. Bromobenzoic acid can be produced by bromination reaction of benzoic acid, and m-bromobenzoic acid can be used as a binder for electrophotographic materials.

(5) Plasticizer

Benzoic acid reacts with diethylene glycol, triethylene glycol, and dipropylene glycol to form important common resin plasticizers diethylene glycol dibenzoate (DEDB), triethylene glycol dibenzoate (TEDB), and dipropylene glycol respectively. Propylene glycol dibenzoate (DPGDB) is widely used in the production of resins, coatings and adhesives. These esters have high boiling points and good chemical stability. They are mainly used as plasticizers for polyvinyl chloride resin, polyvinyl acetate resin and polyester resin. In addition, benzyl benzoate can also be used as a plasticizer for cellulose acetate and nitrocellulose resins. agent.

(6) Corrosion inhibitor

Sodium benzoate has a corrosion inhibition effect. For example, adding sodium benzoate to the cooling water of the automobile cooling system (sodium benzoate concentration is 1.5%) can prevent the cooling system from rusting and corroding. If the cooling device contains cast iron, sodium nitrite needs to be added at the same time to increase the corrosion inhibition effect. In addition, sodium benzoate can be incorporated into packaging pulp, latex coatings, paints, cutting oils and machine oils to prevent metal corrosion.

(7) Coating

Benzoic acid can also be used to improve the gloss, tack, strength and chemical resistance of various alkyd resin coatings. Benzoates and benzoic acid can terminate the chain growth of alkyd resin polymers and promote crystallinity of the product. Introducing benzoic acid into alkyd resin allows the paint film to dry quickly, but is not as solvent-resistant as styrene. The gloss, hardness and water resistance of the paint film made of modified alkyd resin are improved.

(8) Dye carrier

Benzoic acid and butyl benzoate are widely used in polyester fiber dyeing. They can be used as dye carriers when dyeing hydrophobic polyester fibers.

(9) Lubricant

Sodium benzoate can be used as a lubricant in metal processing and pharmaceutical production.

Food and medicine:

(1) Preservatives

Benzoic acid and sodium benzoate have bactericidal and bacterial growth-inhibiting effects, and are low-toxic and odorless, so they are widely used as preservatives. In slightly acidic media, benzoic acid at a concentration of only 0.1% can inhibit bacterial growth. Changing the pH value has a great impact on the bactericidal and bacteriostatic effects of benzoate. Its effect is significantly reduced in alkaline media, and the best effect is achieved when the pH value is between 2.5 and 4.5.

In the food industry, benzoic acid and sodium benzoate can be used as preservatives in soy sauce, pickles, cider, juice, feed, etc. In medicines, cosmetics, toothpaste, powder, tobacco leaves, etc., benzene acid and sodium benzoate are also used as preservatives. Sodium benzoate has greater solubility in water and is usually used more often, but its pH value is higher and its bactericidal and bacteriostatic capabilities are much weaker than benzoic acid.

(2) Drugs

Benzoic acid, sodium benzoate, benzyl benzoate, etc. can be used to make various drugs to treat arthritis, abscesses, bronchitis, skin diseases, etc., and can also be used as local anesthetics. Benzoic acid can be used to make benzoic acid salicylic acid ointment. Benzoic acid salicylic acid ointment is a medicine made from benzoic acid and salicylic acid as the main raw materials, adding lanolin and yellow petrolatum. Among them, the combination of benzoic acid and salicylic acid can treat adult dermatophytes and superficial fungal infections such as tinea corporis, tinea manuum and tinea pedis.

(3) Fixative

Benzoic acid can be used as a flavoring agent for fruit juice drinks. Can be used as an incense stick or as an incense stick. It can also be used in food flavors such as chocolate, lemon, orange, berries, nuts, candied fruits, etc. It is also commonly used in tobacco flavors. Due to the low solubility of benzoic acid, it must be fully stirred when used, or it must be dissolved in a small amount of hot water or ethanol. When used in concentrated fruit juices for refreshing drinks, benzoic acid is easily volatilized with water vapor, so its sodium salt is commonly used.

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