Industry Grade 99% Tetraethylene Glycol Dimethyl Ether CAS 143-24-8

What is tetraethylene glycol dimethyl ether (TEGDImethyl ether)? What are its uses?

1. What is Tetraethylene glycol dimethyl ether?

Tetraethylene glycol dimethyl ether or TEGDME is usually sold as tetraglyme (one of the tetraethylene glycol dimethyl ether series, which also includes monoethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, etc.) It belongs to the polyether family of compounds and its chemical formula is generally written as:

C10H22O5 (CAS No. 143-24-8)

It is a colourless transparent liquid with a low viscosity and almost no smell at room temperature. In addition, it has good chemical stability and thermal stability . The boiling point is about 275℃, the flash point is relatively high, and the density at 20℃ is about 1.01 g/cm3 . It is miscible with water and with most organic solvents.

From a molecular framework point of view, TEGDME is the result of capping the two ends of a tetraethylene glycol chain with methyl groups. The five oxygen atoms in the molecule are in a chain, which provides a strong coordination and solubility. It is a polar aprotic solvent and can dissolve many metal salts, resins and organic compounds, and can form coordination interactions with alkali metals, which has attracted much attention in the fields of electrochemistry and synthesis.

Chemical properties: TEGDME has excellent chemical stability, does not react with most reactants. It may however form peroxides slowly under high temperature or oxidising conditions. Hence it should be kept away from direct sunlight, high temperature and prolonged exposure to air. The peroxide value should be checked at regular intervals.

TEGDME is available in various grades depending on the intended use including industrial, electronic and reagent grades. The industrial grade emphasises the stability of the main content and the economical aspect, and the electronic grade has strict requirements for impurities, such as moisture and metal ions. Reagent (analytical) grade is higher in purity and consistency and is appropriate for laboratory research and development.

II. What other uses does Tetraethylene glycol dimethyl ether have?

1. Reagent Grade: Laboratory and Scientific Research & Development

TEGDME is an important polar aprotic solvent in the laboratory, and it is widely used as a reaction medium in organic synthesis processes, in reaction systems under high temperature or anhydrous conditions, and in organometallic and coordination chemistry research. It has a high boiling point and is not very volatile. This is good for reactions that need to be heated for a long time.

Main applications include:

（1）Solvents and reaction media for organic production

（2）High temperature anhydrous reaction system

（3）Research in Organometallic and Coordination Chemistry

（4）Electronic studies of dissolution and solvation of alkali metals

2. New energy and electrochemistry (battery electrolytes)

TEGDME is a key solvent for electrolytes in state-of-the-art battery systems like lithium-sulfur and lithium-oxygen batteries. The ether chain structure is compatible with the interface of the lithium metal anode, which improves the cycle stability and safety of the battery. It has also been explored as a solvent for the electrolyte in electrochemical systems such as supercapacitors.

Main applications are :

（1）Lithium-Sulfur Battery Electrolyte Solvent

（2）Electrolyte research for lithium-oxygen batteries

（3）Enhanced lithium metal anode interface compatibility

（4）Electrolyte solvent for electrochemical power storage device

3. Gas treatment and environmental protection TEGDME can be used as gas absorbent for natural gas dehydration, carbon dioxide capture, acid gas removal and other processes, which has application value in energy conservation, emission reduction and gas purification.

4. Heat pumps and heat transfer mediums for energy saving

TEGDME is a promising candidate for use as a working fluid or absorbent in absorption heat pumps and refrigeration cycles to enhance the efficiency of thermal energy utilisation, and thus is an emerging application within energy-saving technology.

5. Electronic-grade solvents and speciality production

TEGDME is an electronic-grade solvent, used in electronic material processing, polymer treatment and special cleaning process. High end manufacturing requirements: Low metal ion residue and low moisture content.

6. Other industrial areas

Its uses are still spreading, e.g. in special coatings and surface treatments, as coordination solvents in catalyst systems and media in special chemical reaction systems.

Summarize

Tetraethylene glycol dimethyl ether (TEGDME, tetraglyme) is a polar aprotic polyether solvent with good chemical and thermal stability. In daily life, its contact with us is mainly reflected in the research and development and high-end manufacturing of new energy batteries, natural gas purification, energy-saving heat pump and other industries, which is a typical indirect contact. In addition to industrial applications (speciality solvents, gas treatment, heat transfer media, etc.), TEGDME also plays an important role in reagent-grade scientific research solvents, lithium-sulfur/lithium-oxygen battery electrolytes, gas capture and energy-saving heat pumps, which makes it a multifunctional chemical for future technologies.