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Basic Information
Introduction to 1,2-Propanediol (Propylene Glycol)
1,2-Propanediol, also known as propylene glycol, is an organic compound (a diol) with the chemical formula C₃H₈O₂. Propylene glycol is typically a slightly sweet-tasting, odorless, colorless, and transparent viscous liquid. Chemically, propylene glycol belongs to the category of glycols and is miscible with a variety of solvents, including water, acetone, and chloroform. Propylene glycol can be manufactured through the hydration of propylene oxide and is primarily used to produce polymers. However, it is also utilized as a food additive, with the E number E1520. Propylene glycol has another isomer, 1,3-propanediol.
Product Specification
| Item | Unit | Specification |
|---|---|---|
| PG content | Wt % | 99.50 min |
| Moisture | % | 0.20 max |
| Density (20℃) | g/cm³ | 1.035–1.040 |
| Index of Refraction | nD20 | 1.428–1.435 |
| Acidity | % | 0.02 max |
| Distillation Range | °C | 183–190 |
| Colourity (Pt-Co) | APHA | 16 |
| Appearance | — | Colorless, Viscous, Transparent Liquid |
Applications
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Industrial Raw Materials
It acts as a fundamental raw material for resins, plasticizers, surfactants, emulsifiers, and demulsifiers. It also functions as an antifreeze and heat carrier, ensuring the smooth operation of various industrial systems under extreme temperature conditions.
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Chemical Reagents
In gas chromatography, it serves as a fixative and solvent. Its antifreeze properties make it useful in different chemical processes, and it can also act as a plasticizer and dehydrant.
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Pharmaceutical Industry
In the pharmaceutical field, it is frequently employed as a solvent, softener, and excipient in the manufacture of various ointments and creams, facilitating the effective delivery of active ingredients.
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Daily Life Applications
It is used in air deicing liquids, refrigerants, and antifreeze solutions. Moreover, it finds its way into food and spices, fragrances, cosmetics, and personal health products, enhancing their quality and performance.
Frequently Asked Questions (FAQ)
Q
What is 1,2-Propanediol (Propylene Glycol)?
1,2-Propanediol, commonly known as propylene glycol, is an organic diol compound with the chemical formula C₃H₈O₂. It is a colorless, odorless, slightly sweet-tasting, and transparent viscous liquid that is miscible with water, acetone, and chloroform.
Q
How is Propylene Glycol manufactured?
Propylene glycol is primarily produced through the hydration of propylene oxide. This process involves reacting propylene oxide with water under controlled temperature and pressure conditions to yield the final product.
Q
What is the minimum purity level of your Propylene Glycol product?
Our propylene glycol has a PG content of 99.50% minimum (by weight), ensuring high purity suitable for industrial, pharmaceutical, and food-grade applications.
Q
Is Propylene Glycol safe for use in food and pharmaceuticals?
Yes. Propylene glycol is approved as a food additive under the E number E1520 and is widely used as a solvent, softener, and excipient in the pharmaceutical industry for manufacturing ointments, creams, and other formulations.
Q
What are the main industrial uses of Propylene Glycol?
Propylene glycol is widely used as a raw material for resins, plasticizers, surfactants, emulsifiers, and demulsifiers. It also serves as an antifreeze and heat carrier in industrial systems, a fixative in gas chromatography, and an ingredient in cosmetics, fragrances, and air deicing liquids.
Q
What is the difference between 1,2-Propanediol and 1,3-Propanediol?
1,2-Propanediol and 1,3-propanediol are structural isomers sharing the same molecular formula C₃H₈O₂, but differing in the position of the hydroxyl (–OH) groups on the carbon chain. 1,2-Propanediol has hydroxyl groups on the first and second carbons, while 1,3-propanediol has them on the first and third carbons, resulting in different physical properties and applications.