Difference between acetic acid and pure acetic acid

Acetic acid (Acetic Acid) and pure acetic acid (Purity Acetic Acid) are two often confused concepts, especially in the chemical industry, they have significant differences in properties, uses and storage conditions. This article will analyze the difference between acetic acid and pure acetic acid in detail from multiple angles to help chemical workers better understand these two concepts.

1. Definition and Usage

1. Acetic acid definition

Acetic acid is a common monobasic acid with a chemical formula of CHYCOOH and a molecular weight of 60.05g/mol. In industry and daily life, acetic acid is widely used in the production of food, medicine, detergent and other fields. It is a colorless transparent liquid with sour taste and volatility.

2. Pure acetic acid definition

Pure acetic acid refers to the acetic acid after refining and purification treatment, its impurity content is very low, usually meet or exceed the corresponding index in GB 2751-1986 standard. Pure acetic acid is mainly used in laboratory and high-end industrial applications, such as pharmaceutical synthesis, precision cleaning agents, etc.

2. chemical composition and physical properties

1. Chemical composition

The main component of acetic acid is acetic acid (CHYCOOH), and pure acetic acid is more pure in chemical composition, and the impurity content is less than 0.01%. This purity is critical for certain industrial processes and laboratory analyses.

2. Physical properties

Acetic acid has a density of 1.049g/cm³ and a viscosity of 01 mN · s/mm²(20°C). The physical properties of pure acetic acid are basically the same as those of acetic acid, but due to its higher purity, it is not easy to produce secondary pollution during storage and transportation.

3. storage conditions

1. Storage environment

Acetic acid can be stored stably at room temperature, but it may decompose and release acetic acid gas in high temperature or humid environment. Pure acetic acid also needs to be stored in a cool and dry place, but its purity makes it difficult to cause chemical reactions during storage.

4. industrial applications

1. Preparation process

Acetic acid is usually produced by ethanol fermentation or ethylene oxidation, while pure acetic acid is used in high purity applications, such as key intermediates in pharmaceutical synthesis. The use of pure acetic acid ensures the stability of the subsequent process.

2. Application field

Acetic acid is mainly used for food preservation, solvents, etc., while pure acetic acid is used in high-end fields such as pharmaceutical synthesis and precision cleaning agents. The high purity of pure acetic acid makes it a significant advantage in these applications.

5. Safety and Storage

1. Safety Precautions

Acetic acid has a certain corrosive, storage should pay attention to protection. Pure acetic acid is also volatile and must be used with protective equipment. Both should be operated in a well-ventilated place.

2. Storage recommendations

Both acetic acid and pure acetic acid need to be stored in a cool, well-ventilated place, away from direct sunlight. Pure acetic acid has a longer shelf life due to its purity, but there is still a shelf life to be observed.

6. summary

There are significant differences between acetic acid and pure acetic acid in chemical composition, use, storage conditions and application areas. The high purity of pure acetic acid makes it important in high-end industry and scientific research, while the breadth and economics of acetic acid make it more common in everyday industrial applications. Understanding these differences helps chemists to better select and use the right raw materials, thereby improving production efficiency and product quality.

Through the analysis of this article, we hope that readers can clearly understand the difference between acetic acid and pure acetic acid, so as to make a wiser choice in practical work. The choice of acetic acid and pure acetic acid often depends on the specific process requirements and applications.