It is mainly used for antifungal, disinfection and anticorrosion, for the production of medicines, dye carriers, plasticizers, spices and food preservatives, etc. It is also used for the performance improvement of alkyd resin coatings, and also as a rust inhibitor for steel equipment, agricultural Chemicals.

  medical use

  Benzoic acid can be used to make benzoic acid salicylic acid ointment. Benzoic acid salicylic acid ointment is a medicament made by adding lanolin and yellow petrolatum as main raw materials with benzoic acid and salicylic acid. Among them, the combination of benzoic acid and salicylic acid can treat adult skin mycosis, superficial fungal infections such as tinea corporis, tinea manuum and tinea pedis.

  preservative

  Benzoic acid can be used as a preservative in food, feed, latex, and toothpaste. Under acidic conditions, it has an inhibitory effect on mold, yeast and bacteria, but has a weaker effect on acid-producing bacteria. The antibacterial activity of the molecular state of benzoic acid is higher than that of the ionic state, so when the pH is less than 4, the antibacterial activity is high, and the suitable pH value for antibacterial is 2.5-4.0, generally lower than the pH value of 4.5-5.0. Due to the low solubility of benzoic acid in water, it is actually added to food after adding an appropriate amount of sodium carbonate or sodium bicarbonate and dissolving it in hot water above 90°C to convert it into sodium sodium benzoate. If benzoic acid must be used, it can be dissolved with an appropriate amount of ethanol before application. Because the solubility of benzoic acid to water is lower than that of sodium benzoate, when sodium benzoate is used in acidic foods, care should be taken to prevent precipitation and reduce its use effect due to the transformation of sodium benzoate into benzoic acid. Benzoic acid can be used together with para-hydroxybenzoic acid esters in soy sauce and refreshing drinks to enhance the effect.

  Deodorant

  Benzoic acid can be used as a fixative for juice drinks. It can be used as an ointment for aromatherapy. It can also be used in food flavors such as chocolate, lemon, orange, berries, nuts, and candied fruit. It is also commonly used in tobacco flavors. Due to the low solubility of benzoic acid, it must be fully stirred when used, or dissolved in a small amount of hot water or ethanol. When used in concentrated fruit juice for refreshing drinks, because benzoic acid is easy to volatilize with water vapor, its sodium salt is often used.

  Chemical Intermediates

  Benzoic acid can be used as an intermediate in the production of benzoate and phthalate, which are important plasticizers. Bromobenzoic acid can be prepared by bromination reaction of benzoic acid, and m-bromobenzoic acid can be used as a binder for electrophotographic materials. It can also be used as an intermediate for pharmaceuticals and dyes, and for the preparation of plasticizers and spices.

  lubricant

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

  Coating additives

  The incorporation of benzoic acid into alkyd resins results in fast-drying paint films without the solvent resistance of styrene. The gloss, hardness and water resistance of the paint film made of the modified alkyd resin are all improved. It can also be used as a mordant for dyeing and printing.

  daily use

  Benzoic acid reacts with diethylene glycol, triethylene glycol, and dipropylene glycol to generate important common resin plasticizers diethylene glycol dibenzoate (DEDB), triethylene glycol dibenzoate (TEDB) and diethylene glycol dibenzoate (TEDB) respectively. Propylene glycol dibenzoate (DPGDB), used in the production of resins, coatings and adhesives.