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High-Quality Propylene Glycol from China: Leading Suppliers and Trusted Factory Manufacturer
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
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.
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.
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.
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, and viscous liquid that is miscible with water, acetone, and chloroform. It is widely used in industrial, pharmaceutical, food, and cosmetic applications.
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, either under high-temperature, high-pressure non-catalytic conditions or with catalysts at lower temperatures, yielding a high-purity product suitable for industrial and food-grade use.
Q
What is the minimum purity level of your Propylene Glycol product?
Our propylene glycol product has a minimum PG content of 99.50 wt%, with moisture not exceeding 0.20%, and acidity no more than 0.02%. The product appears as a colorless, viscous, and transparent liquid with a distillation range of 183–190°C.
Q
Is Propylene Glycol safe for use in food and pharmaceuticals?
Yes. Propylene glycol is recognized as safe for use in food products and carries the E number E1520 as a food additive. In the pharmaceutical industry, it is widely used as a solvent, softener, and excipient in the production of ointments, creams, and other formulations, and is approved by major regulatory agencies worldwide.
Q
What are the main industrial uses of Propylene Glycol?
Propylene glycol serves as a key raw material for resins, plasticizers, surfactants, emulsifiers, and demulsifiers. It is also used as an antifreeze and heat transfer fluid in industrial systems, a fixative and solvent in gas chromatography, and a component in air deicing liquids, refrigerants, cosmetics, fragrances, and food products.
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 with different hydroxyl group positions. In 1,2-propanediol, the hydroxyl groups are on adjacent carbon atoms, while in 1,3-propanediol they are on the first and third carbons. This difference affects their chemical properties, reactivity, and applications across various industries.