What is Glacial Acetic Acid?
Glacial acetic acid (CAS 64-19-7) is acetic acid with a very low water content, typically less than 1%. In many chemical synthesis processes, it is also known as anhydrous acetic acid. Its freezing point is approximately 16.7°C, at which it forms crystal-like solids.
Glacial acetic acid has a strong pungent odor and a molecular weight of 60.05 g/mol. It is widely used as a precursor in chemical synthesis, including the production of acetic anhydride and terephthalic acid. Its chemical formula is CH₃COOH.
How is Glacial Acetic Acid Different from Acetic Acid?
Here's a simple table to help you understand the difference between glacial acetic acid chemical and acetic acid
| Property | Glacial Acetic Acid | Acetic Acid |
|---|---|---|
| Water Content | < 1% | > 1% |
| Purity | High | Low |
| Physical State at Room Temperature | Liquid / Solid (below 16.7°C) | Liquid |
| Corrosiveness | Highly corrosive | Lowly corrosive |
Glacial Acetic Acid Benefits
- Glacial acetic acid has an extremely low water content, which helps improve reaction efficiency and reduce unwanted by-products during chemical synthesis.
- Compared with diluted acetic acid, it offers higher reactivity, allowing manufacturers to use smaller quantities while achieving effective reaction performance.
- Its high purity enables better control in industrial processes such as esterification and polymerization, resulting in more stable product quality.
- Since it is already highly concentrated, additional pre-concentration steps are usually unnecessary, helping reduce processing time, energy consumption, and production costs.
- Lower impurity levels also minimize downstream purification requirements, improving overall manufacturing efficiency and product consistency.
Uses of Glacial Acetic Acid
Industrial applications of Glacial Acetic Acid in manufacturing
In chemical production, glacial acetic acid is a key intermediate used to synthesize acetic anhydride, vinyl acetate, and cellulose acetate, which are widely applied in plastics, adhesives, coatings, and synthetic fibers. Global consumption of acetic acid exceeds 16 million tons annually, with a significant share used in vinyl acetate monomer (VAM) production. Compared with diluted acetic solutions, glacial acetic acid provides higher reaction efficiency and more stable yield control in industrial synthesis processes.
glacial acetic acid uses in food
In the food sector, glacial acetic acid is diluted into vinegar solutions used for flavoring and preservation, helping inhibit bacterial growth and extend shelf life. Typical vinegar contains only 4–8% acetic acid, while glacial acetic acid provides nearly 100% concentration before dilution, allowing precise formulation control in food processing. Its antimicrobial properties make it widely used in pickling vegetables, sauces, and condiments, where it significantly reduces spoilage rates during storage and transportation.
glacial acetic acid used in textile
In textile manufacturing, glacial acetic acid is used in dye fixation and pH regulation during fabric processing, improving color stability and washing resistance. Textile dyeing operations can consume thousands of tons annually in large production hubs such as China and Bangladesh. Compared with untreated dye processes, fabrics processed with controlled acetic acid treatment show improved color fastness and reduced fading rates, making it essential for high-quality textile finishing.
glacial acetic acid pharmaceutical use
In pharmaceuticals, glacial acetic acid is used as a reagent in the synthesis of active pharmaceutical ingredients, including aspirin and antibiotic intermediates. The pharmaceutical-grade segment continues to grow alongside global healthcare demand, particularly in Asia where medicine production capacity has expanded rapidly over the past decade. However, due to its corrosive nature, it requires strict handling standards, including corrosion-resistant storage systems and controlled ventilation to ensure worker safety and product stability.
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FAQ: Your Practical Questions About Glacial Acetic Acid
Q: What is the difference between glacial acetic acid solution and vinegar?
A: Glacial acetic acid is almost pure acetic acid (about 99%), mainly used in industrial applications, while vinegar contains only 4–8% acetic acid and is used for food purposes.
Q: How should glacial acetic acid be stored to prevent damage or corrosion?
A: It should be kept in tightly sealed, corrosion-resistant containers such as glass or suitable plastics, stored in a cool, dry place away from metals and incompatible chemicals.
Q: Is glacial acetic acid safe for food preservation?
A: It can be used in food-related applications only after proper dilution and compliance with food safety standards; it helps inhibit microbial growth when correctly formulated.
Q: What is its shelf life under proper storage conditions?
A: When stored correctly in sealed containers, it remains chemically stable for several years, although contamination or air exposure may reduce its stability over time.
Glacial Acetic Acid Specification Table
| Item | Specification |
|---|---|
| Product Name | Glacial Acetic Acid |
| Chemical Formula | CH₃COOH |
| CAS Number | 64-19-7 |
| Purity | ≥ 99.5% (up to 99.9%) |
| Appearance | Colorless transparent liquid |
| Odor | Strong pungent vinegar-like smell |
| Acetic Acid Content | 99–100% |
| Freezing Point | 16.6°C |
| Boiling Point | 118°C |
| Density (20°C) | ~1.049 g/cm³ |
| Water Content | ≤ 0.5% |
| Grade Options | Industrial grade / Food grade / Pharmaceutical grade |
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