GB/T 3728-2023 in English

1. Background and significance of the standard

GB/T3728-2023 "Ethyl acetate for industrial use" is a national standard of the People's Republic of China, applicable to ethyl acetate for industrial use produced by esterification of acetic acid and ethanol under the action of a catalyst. This standard replaces the old version GB/T3728-2007, and mainly makes comprehensive revisions to the technical requirements, test methods and safety parts.

2. Comparison of standard frameworks

3. Detailed explanation of technical requirements

The technical requirements for industrial ethyl acetate are divided into Type I and Type II. The main indicators include:

• Appearance: Transparent liquid, free of suspended impurities
• Chroma (platinum-cobalt color number): ≤10 Hazen units
• Ethyl acetate content: Type I ≥99.8%, Type II ≥99.5%
• Ethanol content: Type I ≤0.05%, Type II ≤0.10%
• Water content: Type I ≤0.05%, Type II ≤0.10%

4. Analysis of key test methods

The main test methods involved in the standard include:

• Gas chromatography: Used for the determination of ethyl acetate, ethanol and benzene series
• Karl Fischer method: Used for the determination of water content
• Titration: Used for determination of acidity (measured in acetic acid)
• Densitometer method: Used for determination of density

5. Implementation recommendations

To ensure effective implementation of the standard, it is recommended that:

1. Manufacturers: Establish a sound quality control system and conduct production and inspection in strict accordance with the standard.
2. Testing agencies: Equipped with advanced gas chromatographs and other equipment to ensure the accuracy of the determination method.
3. User units: Confirm that the product meets the requirements of the standard before purchasing and using it.
4. Safety precautions: Strictly follow the safety tips in Appendix B of the standard to avoid dangerous situations.