دات نت نیوک
MONOETHYLENE GLYCOL (MEG)

DESCRIPTION

Monoethylene glycol (Ethylene glycol) is a colorless, virtually odorless and slightly viscous liquid. It is miscible with water, alcohols, aldehydes and many organic compounds. MEG will not dissolve rubber, cellulose acetate or heavy vegetable and petroleum oils. MEG has a low volatility and it is 50% more hygroscopic than glycerol at room temperature.

 

APPLICATIONS

MEG is mainly used in the production of polyester, polyethylene terephthalate (PET) and antifreeze solutions. It is an important dehydrating agent, good humectant and an industrial solvent.

 

STORAGE AND HANDLING

MEG is stored and shipped in stainless steel tanks (or in ordinary steel drums/tanks with epoxy resin coating) to avoid iron contamination. Where contamination by iron is desirable, metal in contact with the glycol should be aluminum or stainless steel (type 304/316). MEG is loaded after thorough cleaning and drying of tanks and nitrogen purging to ensure that it remains chloride, iron, and ash-free. Shipments are made in tanks, tankers of varying capacities and in lined steel drums. Precautionary labeling: “Ethylene Glycol. For Industrial Use Only. Harmful or Fatal if Swallowed”.


DIETHYLENE GLYCOL (DEG)

DESCRIPTION

Diethylene Glycol (Dihyroxy diethyl ether) is a colorless, virtually odorless, viscous liquid. Compared to MEG, it has a higher boiling point, viscosity and specific gravity. DEG is characterized by great solvent power, extreme hygroscopicity and low vapor loss.

 

APPLICATIONS

The viscous glycol ether is an important industrial solvent. It is utilized in the manufacture of unsaturated polyesters, plasticizer and some important resins. It is a dyeing agent of gases. DEG is an effective softening agent, making glues and adhesives more flexible. It is an important component in formulations of brake fluids pastes and pigments.

 

STORAGE AND HANDLING

The storage of DEG presents no unusual problem. It may be stored in ordinary carbon steel containers. However, for ease of handling and to maintain its purity, special precautions should be taken.
DEG is shipped under rigid conditions (with careful cleaning, drying of tanks and nitrogen purging) to ensure that it remains chloride, iron, and ash-free. Shipment can be made promptly in big vessels, in tank cars of various sizes and in lined steel drums. Precautionary labeling, “Diethylene Glycol. For Industrial Use Only. Harmful or Fatal if Swallowed”.


TRIETHYLENE GLYCOL (TEG)

DESCRIPTION

Triethylene Glycol (TEG) is a larger molecule than MEG, DEG and has two ether groups. It is less clear and less hygroscopic than DEG, but has a higher boiling point, density and viscosity.

 

PROPERTIES

The properties of TEG resemble those of DEG, but it is heavier. TEG is also distinguished by its antibacterial properties.

 

APPLICATIONS

TEG is an important non-volatile industrial solvent. It is also useful in the dehydration of gases, manufacture of insecticides and in the synthesis of some organic derivatives. Pure TEG is useful in the production of plasticizers for cellophane, glue, cork, powdered ceramics and some plastics. TEG is a component in the formulation of some pigments, printing dyes, inks and pastes. It is also used for air fumigation.

 

STORAGE AND HANDLING

TEG may be stored in ordinary carbon steel containers. However, for ease of handling and to maintain its purity, special precautions should be taken. To avoid contamination by iron, TEG storage tanks should be made of stainless steel (type 304 or 316) or aluminum. If contamination by halides is undesirable, the packing of the valves and the gaskets should be made of asbestos or halide-free materials.
TEG is loaded after thorough cleaning and drying of tanks, and nitrogen purging to ensure that it remains chloride, iron, and ash-free. It can be shipped in big vessels, tankers of various sizes and in lined steel drums. Precautionary labeling, “Triethylene Glycol. For Industrial Use Only.”