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Typical difference between Dipropylene Glycol DPG and Propylene Glycol PG

11-24, 2023

Many customers had questions about the difference betwwen Propylene glycol PG and Dipropylene glycol DPG. Recently, Hefei TNJ Chemical Industry Co., Ltd. has been listed as top chemical manufacturer and supplier, with its main chemical products being propylene glycol PG USP grade (CAS 57-55-6) and dipropylene glycol DPG (CAS 110-98-5). We would like to tell the difference as bellow for your reference.


1. Chemical structural differences

The chemical formulas for dipropylene glycol and propylene glycol are C6H14O2 and C3H8O2, respectively. From a chemical structure perspective, the most significant difference between them is that there are two isomers in the dipropylene glycol molecule, while there is only one isomer in the propylene glycol molecule.
Where to buy Dipropylene glycol DPG from China
2. Differences in nature
- Physical properties
Both have a colorless transparent liquid appearance, but the density of propylene glycol is higher than that of propylene glycol. Meanwhile, the boiling and melting points of dipropylene glycol and propylene glycol are also different.
- Chemical properties
Due to differences in chemical structure, the properties of dipropylene glycol and propylene glycol also differ. Dipropylene glycol has weaker stability towards acids, bases, etc., while propylene glycol is more stable. In addition, dipropylene glycol is also more easily oxidized by oxidants than propylene glycol.
- Different uses
-- Use of Dipropylene Glycol
Dipropylene glycol is an important organic chemical raw material widely used in the production of various advanced compounds and functional materials. For example, dipropylene glycol can be used to produce polyimide, polyurethane, coatings, plastics, resins, etc. In addition, it can also be used in the manufacturing of paint thinners, dye thinners, paints, and cleaning agents.
-- Use of propylene glycol
Propylene glycol is mainly used in fields such as food, medicine, and cosmetics. For example, it can be used to produce chewing gum, coffee mate, essence, condiments and health products. In addition, propylene glycol can also be used as a temperature promoter, stabilizer, etc. in the pharmaceutical industry.

Overall, although there are differences in chemical structure between dipropylene glycol and propylene glycol, there are also some similarities. The properties and uses of the two are also different. I hope this article can answer readers' doubts about these two compounds.

Dipropylene glycol (DPG) is a by-product in the production of propylene glycol, which is formed by hydrolyzing oxidized propylene with excess water under high temperature and pressure. Dipropylene glycol is a distillate, colorless, almost odorless, water-soluble, and moderately viscous hygroscopic liquid with low vapor pressure and toxicity. Mainly used for manufacturing solvents, coupling agents, and chemical intermediates.

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