China Pharmaceutical Medical Grade Benzoic Acid CAS: 65-85-0, Find details about China Benzoic Acid, Carboxybenzene from Pharmaceutical Medical Grade Benzoic Acid CAS: 65-85-0
Benzoic acid is an aromatic acid organic compound and the simplest aromatic acid, with a molecular formula of C7H6O2. It was originally made from benzoin gum, so it is called benzoic acid. The melting point is 122.13 ºC, the boiling point is 249.2 ºC, and the relative density (15/4 ºC) is 1.2659. The appearance is white needle-like or scaly crystals. It will sublimate when the temperature is above 100 ºC. Slightly soluble in cold water and hexane, soluble in hot water, ethanol, ether, chloroform, benzene, carbon disulfide and turpentine, etc.
Benzoic acid is widely present in nature in the form of free acid, ester or its derivatives. It is mainly used for the preparation of sodium benzoate preservative, and for the synthesis of drugs and dyes; also for the preparation of plasticizers, mordants, fungicides and spices. It can be prepared by direct oxidation in the presence of manganese dioxide; or prepared by decarboxylation with water vapor.
Preservative
Benzoic acid and sodium benzoate have the effect of sterilizing and inhibiting the growth of bacteria, and are low in toxicity and tasteless, so they are widely used as preservatives. In slightly acidic media, only 0.1% concentration of benzoic acid can inhibit bacterial growth. Changing the pH value has a great influence on the bactericidal and antibacterial effects of benzoate, and its effect is significantly reduced in a reduced medium, and the effect is best 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 for soy sauce, kimchi, cider, fruit juice, and feed. In medicine, cosmetics, toothpaste, powder, tobacco, etc., benzene acid and sodium benzoate are also used as preservatives. Sodium benzoate has a greater solubility in water and is usually used more, but its pH value is higher, and its bactericidal and antibacterial ability is much weaker than that of benzoic acid.
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