4-Hydroxybenzoic acid, CAS number 99-96-7

CAS Number: 99-96-7
Molecular Formula: C7H6O3

Description:

4-Hydroxybenzoic Acid is a versatile organic compound with remarkable antibacterial properties. It is commonly found as a colorless crystalline or powdery substance. Due to its phenolic hydroxyl structure, it exhibits superior antibacterial efficacy, outpacing both benzoic and sorbic acids. This compound is particularly beneficial in the formulation of preservatives for pharmaceuticals, cosmetics, and the food industry due to its low toxicity and effectiveness across a broad pH range.

Production Process:

4-Hydroxybenzoic Acid is produced using a sophisticated phenol-potassium carboxylation process, designed for industrial-scale manufacturing. The process involves:

1. Combination of Potassium Hydroxide and Phenol: A 40% potassium hydroxide solution is combined with phenol.
2. Heating and Dehydration: The mixture undergoes heating and dehydration under normal and reduced pressures to yield a composite salt of phenol potassium and phenol.
3. Carboxylation: The composite salt is treated with anhydrous carbon dioxide at 0.5 MPa pressure, undergoing multiple stages of carboxylation.
4. Neutralization and Purification: The carboxylated solution is neutralized with sulfuric acid, followed by filtration and recrystallization to achieve a purity level exceeding 99%.

Applications:

• Food Industry: As a preservative, it enhances the shelf-life of products like sauces, beverages, and pickles.
• Cosmetics and Pharmaceuticals: Used for preservation in these products, ensuring safety and longevity without compromising on skin or health compatibility.
• Industrial Uses: Key intermediate in the synthesis of dyes, pesticides, and advanced polymers, including liquid crystal polymers and plastics.

Notable Achievements:

• Para-Hydroxybenzoic Acid: A derivative used in liquid crystal polymer synthesis, which won the third prize in the Science and Technology Progress Award.
• Annual Production: 5000 tons of para-hydroxybenzoic acid production capacity per year.
• Environmental Considerations: The company has implemented a state-of-the-art wastewater treatment system for the production of para-hydroxybenzoic acid, ensuring it is environmentally friendly and pollution-free.

Product Category:

• Organic Compounds
• Phenolic Compounds
• Benzoic Acids
• Parabens

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