The丙烯和甘油之间的关键区别is that propylene glycol compound has two羟groups per molecule, whereas glycerin has three hydroxyl groups per molecule.
Propylene glycol and glycerin often look the same since they occur as colourless, odourless, sweet, and syrupy products. Even though they share some physical properties, they have very distinctive features. However, propylene glycol is toxic, and it is very important to identify these two compounds accurately before use.
What is Propylene Glycol?
Propylene glycol is a viscous and colourless liquid that is almost odourless and has a faintly sweet taste. It has the chemical formula C3H8O2。丙二醇分子中有两个酒精基团。一条链中有三个碳原子，两个碳原子附着两个碳原子。因此，我们可以将其归类为二醇。此外，丙烯乙二醇与许多溶剂（例如水）混乱，acetone, and氯仿。
What is Glycerin?
甘油或甘油是具有化学式CHCH的简单聚醇化合物2CH2(OH)3。This compound is colorless, odorless, and occurs as a viscous liquid that has a sweet taste and it is also non-toxic. The backbone of this compound is made up of lipids named glycerides.
We can get glycerin from plant and animal sources in which it occurs as triglycerides, esters of glycerol along with long-chain carboxylic acids, etc. There are hydrolysis,saponification, or式延续processes that can be used to make the glycerol and fatty acid derivative triglyceride.
What is the Difference Between Propylene Glycol and Glycerin?
Propylene glycol and glycerin are important organic compounds. They have closely similar structures and properties. The key difference between propylene glycol and glycerin is that the propylene glycol compound has two hydroxyl groups per molecule, whereas glycerin has three hydroxyl groups per molecule. More importantly, propylene glycol is toxic, whereas glycerin is not toxic. Propylene glycol is used to absorb extra water and maintain moisture in certain medicines, cosmetics, and food products, while glycerin is used as a sweetener in the food industry, as a bacterial culture medium, used as an FDA-approved wound and burn treatment, etc.
The below infographic presents the differences between propylene glycol and glycerin in tabular form for side-by-side comparison。
Summary – Propylene Glycol vs Glycerin
Propylene glycol is an organic compound having the chemical formula C3H8O2,while glycerol is a simple polyol compound having the chemical formula CHCH2CH2(OH)3。The key difference between propylene glycol and glycerin is that the propylene glycol compound has two hydroxyl groups per molecule, whereas glycerin has three hydroxyl groups per molecule.
1. “Propylene Glycol。”National Center for Biotechnology Information. PubChem Compound Database, U.S. National Library of Medicine.
2. Ajiboye, Tolu. “Find out What the Uses of Propylene Glycol Are。”非常健康的健康。