Introduction to 1,2-propanediol

1,2-propanediol, also known as propylene glycol, is an organic compound (diol) with the chemical formula C3H8O2. Propylene glycol is usually a slightly sweet, odorless, colorless and transparent thick liquid. Chemically, propylene glycol is a type of diol that is miscible with various solvents such as water, acetone, and chloroform. Propylene glycol can be produced through the hydration of epichlorohydrin and is mainly used to generate polymers, but it is also used as a food additive with an E code of E1520. Propylene glycol has another isomer, 1,3-propanediol.

Basic information of 1,2-propanediol

1,2-Propanediol Numbering system

1,2-Propanediol Physical and Chemical Properties

• Appearance and characteristics:

• Transparent viscous liquid

• Density:

• 1.036 g/mL at 25ºC(lit.)

• Boiling point:

• 187ºC

• Melting point:

• -60ºC

• Flash point:

• 99ºC

• Refractive index:

• n20/D 1.432(lit.)

• Stability:

• Stable under normal temperatures and pressures.

• Storage conditions:

• Warehouse ventilation, low temperature drying

Security information

• Safety instructions:

• S24/25

• Customs code:

• 2905320000

Production method and purpose

Production method

1. The direct hydration method of epichlorohydrin is a pressurized non catalytic hydrolysis method. Produced by direct hydration of epichlorohydrin and water at 150-160 ℃ and 0.78-0.98MPa pressure, the reaction product is evaporated and distilled to obtain the final product.

use to

In the food industry, propylene glycol reacts with fatty acids to form propylene glycol fatty acid esters, which are mainly used as food emulsifiers; Propylene glycol is an excellent solvent for seasoning and coloring. Propylene glycol is commonly used in the pharmaceutical industry as a solvent, softener and excipient for the manufacture of various ointments and ointments. Due to the good mutual solubility between propylene glycol and various spices, it is used as a carrier for various essence, as well as as a solvent and softener for cosmetics. Propylene glycol is also used as a tobacco humidifier, mold inhibitor, lubricant for food processing equipment, and solvent for food labeling ink. The aqueous solution of propylene glycol is an effective antifreeze agent.