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Dipropylene Glycol CAS 110-98-5

Molecular Formula: C6H14O3

Formula Weight: 134.17

ZSpharmac: Dipropylene Glycol Raw Material Supplier

Product Name: Dipropylene Glycol
CAS No: 110-98-5
Purity: 99%

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Basic Info

Product Name:Dipropylene Glycol
Other Names:1,1′-Oxydi-2-propanol
Place of Origin:Shandong, China
Brand Name:ZSpharmac
Type:Cosmetic Raw Materials
Appearance:Colorless Slightly Viscous Liquid
EINECS No.:203-821-4
Storage:Room Temperature
Provide:Dipropylene Glycol MSDS;
Dipropylene Glycol COA

What is Dipropylene Glycol?

Dipropylene glycol, also known as DPG, is a versatile chemical compound used as a solvent for various applications. It is commonly used in cellulose acetate and cellulose nitrate, as well as in shellac varnish and castor oil. Additionally, it serves as a solvent for nitrocellulose and is utilized as an intermediate in organic synthesis. Overall, DPG is a crucial chemical raw material with a wide range of uses.

Dipropylene Glycol Property

Melting point -40 °C
Boiling point 229-232 °C
density 1.02
vapor density 4.63
refractive index 1.44-1.442
Fp 138 °C
storage temp. Inert atmosphere,Room Temperature
color Colorless,sltly viscous liquid


Dipropylene Glycol Application:

Dipropylene glycol is commonly used as a solvent for various applications such as nitrocellulose, shellac varnish, cellulose acetate, and more. It is also utilized in the preparation of unsaturated polyester resins, plasticizers, and synthetic detergents. Additionally, it is suitable for products that are sensitive to odors, including flavors, fragrances, and cosmetics.

In the realm of flavors, fragrances, and cosmetics, dipropylene glycol serves as an ideal solvent due to its excellent water, oil, and hydrocarbon co-solubilization capabilities. It has a mild odor, minimal skin irritation, and low toxicity, with evenly distributed isomers of high quality.

Furthermore, dipropylene glycol acts as a coupling agent and humectant in various beauty and cosmetic applications. It is commonly used in perfumes, where it can make up more than 50% of the formulation. In other applications, the usage proportion generally falls within 10% (by weight). Specific product application areas include curling liquid, skin cleansing products, deodorants, and various skin care products.

Moreover, dipropylene glycol is utilized in the production of unsaturated and saturated resins, resulting in products with excellent softness, crack resistance, and weather resistance, as well as long-term resistance to yellowing.

Dipropylene Glycol Preparation

The continuous vacuum distillation process for dipropylene glycol involves three interlocking distillation towers, ensuring high efficiency, low energy consumption, and stable product quality. The specific operation is as follows:

1. Propylene glycol distillation tower operation:
Crude dipropylene glycol (with approximately 50% DPG and 10% TPG content) is pumped into the horizontal kettle of the propylene glycol distillation tower. The gas phase is heated and evaporated before entering the tower. The catalyst is enriched in the horizontal kettle and regularly recycled to the catalyst storage tank. The steam pressure in the kettles is controlled at 0.6~0.7MPa, with a vacuum degree in the tower of -98kPa. The reflux ratio is 3~4, and the temperature at the top of the tower is maintained at around 110°C, resulting in a propylene glycol content of 99%. The mixed material is then pumped to the middle tank of the kettle.

2. Dipropylene glycol distillation tower operation:
The operating mixture from the previous step is pumped to the dipropylene glycol distillation tower. A falling film reboiler is used for circulating heating, with a steam pressure of about 0.7MPa and a vacuum degree in the tower of -99kPa. The top of the tower adopts full reflux or intermittent delighting, and the temperature in the tower reaches about 135°C, resulting in a propylene glycol content of over 99.5%. The temperature of the tower kettle is controlled at about 170°C, and the content of dipropylene glycol is less than 5%. The mixed material is then pumped to the middle tank of the kettle.

3. Tripropylene glycol distillation tower operation:
The operating mixture from the previous step is pumped to the tripropylene glycol distillation tower. A falling film reboiler is used for circulating heating, with a steam pressure of about 0.8MPa and a vacuum degree in the tower of -99kPa. The reflux ratio at the top of the tower is controlled to 4 to 5, and the mid-temperature reaches about 160°C, resulting in tripropylene glycol finished product with a content of more than 99%. The heavy components in the tower kettle are enriched and regularly output to the intermediate tank.

The three-tower continuous industrial vacuum distillation production of dipropylene glycol is efficient, ensures quality separation of materials, and improves finished product quality while reducing energy consumption. Compared with intermittent vacuum distillation, the continuous vacuum distillation process offers significant advantages and is the preferred method for industrial production of dipropylene glycol.

Contact Us

About Products:
If you need the cosmetic raw material Dipropylene Glycol, please contact our service staff directly, we will provide you with high-quality products at the best price.
As an experienced Dipropylene Glycol manufacturer and supplier, our company, ZSpharmac will provide Dipropylene Glycol raw materials to customers around the world for a long time.
Over the years, the company has adhered to the spirit of “integrity management, strict quality control, and customer first” and has won unanimous praise from customers at home and abroad.

Company Profile and Corporate Culture

Company Profile:

ZhiShang Chemical is owned by ZhiShang Group is a professional new-type chemicals enterprise combined into research and development, production and sales .

The company’s competitive product is pharmaceutical raw materials and intermediates (especially carbohydrate derivatives Series), In recent years, the company has made a major breakthrough in food and feed additives, plant extraction, industrial chemicals industry .

The company insists on the spirit of “sincere management, strict quality control, customer as god” , get consistent high praise from customers at home and abroad.

Corporate Culture:

Help China Chemicals to benefit the happiness of human life
Become the most trusted chemical supplier in the world
Striver – oriented, enrich employees, customer first, deep service, seek development
Be prepared for danger in times of peace, forge ahead actively, unity and cooperation, and be brave to fight

About Us

The production base is located in Zhangqiu chemical industry park and Tai’an high-tech chemical industry park. laboratory and workshop in strict accordance with the GMP standard and the product fit national ISO9001 and ISO2000 standards.

“Zhishang” products are exported to Europe, North and South America, the Middle East, Asia Pacific and Africa area, so as to establish a long-term and stable cooperation relationship with customer in the world.

Company Info
  • Business Type: Manufacturer
  • Product Range: Cosmetic raw materials
  • Products/Service:Cosmetic raw materials (flavors and fragrances,antioxidant products, moisturizing and hydrating, whitening agents, cosmetic additives)
  • Total Employees: 51~100
  • Capital (Million US $): 10000000RMB
  • Year Established: 2016
Production Capacity
  • No. of Production Lines : 8
  • No. of QC Staff : 5 -10 People
  • OEM Services Provided : yes
  • Factory Size (Sq.meters) : 3,000-5,000 square meters
  • Certificate: ISO9001 , CE , GMP , API , MSDS
  • Factory Location : Diao Town Industry Park, Zhangqiu City, Jinan City, Shandong Province, China.


Pre-Sales Service

* Prompt reply and 24 hours online, professional team to provide best price and high quality product.

* Sample testing support.

* Every batch of products will be tested to ensureits quality.

*The packing also can be according the customers` requirment.

*Any inquiries will be replied within 24 hours.

*we provide Commerical Invoice, Packing List, Bill of loading, COA , Health certificate and Origin certificate. If your markets have any special requirements, let us know.


After-Sales Service

*The fact of logistics information monitoring.

* Any questions about the product can be consulted at any time.

*Product has any problem can return.


Do you accept sample order?

We will make samples before mass production, and after sample approved, we’ll begin mass production. Doing 100% inspection during production, then do random inspection before packing.



You can get free samples for some products,you only need to pay the shipping cost or arrange a courier to us and take the samples. You can send us your product specifications and requests,we will manufacture the products according to your requests.

What’s your MOQ?

Our MOQ is 1kg. But usually we accept less quantity such as 100g on the condition that sample charge is 100% paid.

Do you supply product report?

Yes. We’ll give you product analysis report before shipping.

  Is there a discount?

Different quantity has different discount.


1. ≤50kg, Express delivery recommended, usually called as DDU service;

2. ≤500kg, Air shipping recommended, usually called as FOB, CFR, or CIF service;

3. >500kg, sea shipping recommended, usually called as FOB, CFR, or CIF service;

4. For high value products, please select air shipping and express delivery for safe.

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