Monoethylene Glycol (MEG)(HEAT TRANSFER MEDIA) 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.Mono Ethylene Glycol (MEG) is the most widely used chemical from the Glycol family. It is an essential raw material for Polyester fibres and Polyethylene Terephthalate (PET) polymer. MEG based products are also used as coolants in Automobile antifreeze, resins, humectants for / paper etc.
MEG can be transported in Epoxy coated MS tankers. It can be stored in MS containers lined with baked phenolic resin / air drying epoxy phenolic resin or vinyl resin. It is advisable to store MEG in a cool, dry place with good ventilation - away from heat, sparks or flames.
Mono Ethylene Glycol is an essential raw material for Polyester. Ethylene Glycol reacts with PTA / to produce polyester.
2. Adhesives, Sealants and Coatings
Mono Ethylene Glycol and D-Ethylene Glycol is used in latex based paint formulation. These glycols are also used to produce acrylate and methacrylate resins for coatings, adhesives, and paints.
3. Alkyd Resins for Paints and Coatings
Mono Ethylene Glycol is used as a reactant in the manufacture of Alkyd resins which are used in Paints, enamels and varnishes.
Ethylene Glycol (MEG) is used as an active ingredient in engine coolants and antifreeze, offering benefits including a high boiling point, low vapor pressure, excellent heat transfer abilities, and the ability to depress the freezing point of water.
A) Dyes & Inks
MEG finds applications in products like Dyes & Inks for High speed printing.
Glycols being hygroscopic in nature are also used as Humectants for , paper etc.
TEG is produced as a byproduct in the manufacture of MEG.
TEG is a colorless liquid with a high boiling point. It is most hygroscopic in nature, amongst Mono & Diethylene Glycols. TEG is miscible with water, alcohol , ether , acetone but is insoluble in benzene and its homologues. TEG is a stable non corrosive chemical with a high flash point. TEG finds end use in Natural Gas Dehydration , Plasticizers , Conditioning agents etc. At normal temperature and pressure, TEG can be easily transported in Mild steel tankers , internally coated with an epoxy paint. Similarly, TEG can be stored in MS containers lined with baked phenolic resin / air drying epoxy phenolic resin or vinyl resin. It is advisable to store TEG in a cool , dry place with good ventilation - away from heat, sparks or flames.
Care should be taken to prevent TEG from mixing with strong acids , bases and oxidising materials.
1. Natural Gas Dehydration: Hygroscopic nature of TEG is put to use in dehydration of natural gas. TEG is contacted counter currently with natural gas in a packed or bubble tray to remove moisture from natural gas. TEG is subsequently regenerated for reuse by stripping it of its water content. 2.
2. Plasticizer:TEG can be effectively used as a plastisizer for Vinyls, nitro cellulose, safety glasses. Diesters of TEG gives good low temperature properties and smooth film finishes.
3. Conditioning Agent
The affinity of TEG for water is used advantageously in the manufacture of adhesives or pastes to eliminate shrinkage, curling and brittleness.
Property Unit Specifications
1 Appearance - Clear Colourless
2 TEG Content Wt % min 99.2
3 DEG Content Wt. % max. 0.5
4 PEG Content Wt. % max. 0.25
5 Specific Gravity @20/20 Deg C 1.124 - 1.126
6 Distillation Range @ 760 mm Hg 5-95 vol% Deg C 280-295
7 Water Wt. % max. 0.1
8 Color Pt-Co Units max. 25
9 Ash Wt.ppm Max. 50
PG USP/EP is an important ingredient for a multitude of uses, including:
Heat Transfer Fluids
Fragrance, Cosmetics and Personal Care
Food and Flavorings
Pet Food/Animal Feed
Dipropylene Glycol is used as a reactive intermediate in the manufacturing of high-performance unsaturated polyester resins, polyurethanes and plasticizers. Dipropylene glycol has great solvency, a low evaporation rate, low toxicity, high viscosity and low odor, making it a chemical intermediate of choice for many applications, including:
Other effective uses of Dipropylene Glycol are:
Paint and Coatings
PPG is used in many formulations for polyurethanes. It is used as a rheology modifier.
PPG is used as a surfactant, wetting agent, dispersant in leather finishing.
PPG is also employed as a tuning reference in mass spectrometry.PPG is used as a primary ingredient in the manufacture of paintballs.
RADOTHERM 510 ia an pre-Inhibited Propylene Glycol(s) is an inhibited propylene glycol based industrial coolant and heat transfer agent. It is a slightly hazy liquid, free of suspended solids with a slight odor. The inhibitor system is designed to protect brass, copper, solder, steel, cast iron, aluminum, and other metals commonly found in industrial cooling and heating systems. A foam inhibitor is included to minimize foaming tendencies during service.
The effectiveness of RADOTHERM 510 Inhibited Glycol(s) in preventing corrosion has been proven in extensive laboratory simulated service and in actual service tests. Using RADOTHERM 510 Inhibited Propylene Glycol(s) for heat transfer applications in place of brine solutions or uninhibited glycol-water solutions lowers maintenance costs and improves heat transfer.
Since RADOTHERM 510 Inhibited Glycol(s) is formulated with propylene glycol, it is especially suitable for applications in which toxicological and environmental considerations are critical.
RADOTHERM 510 Inhibited Propylene Glycol(s) is compatible and completely interchangeable with systems currently utilizing ethylene glycol based coolants.
RADOTHERM 510 Inhibited Propylene Glycol(s) protects cooling systems from freezing in winter, overheating in summer, and corrosion in all seasons. Improved heat transfer and less internal corrosion contributes significantly to overall operating and maintenance costs. RADOTHERM 510 Inhibited Glycol(s) is recommended as a heat transfer fluid for line heaters, ground thawing, athletic fields, grave digging, snow melting systems for loading ramps, walkways, highways, and airfield runways. The corrosion protection provided by RADOTHERM 510 Inhibited Propylene Glycol(s) and its low toxicity level as compared to other heat transfer fluids makes it an ideal transfer medium for heating, ventilation, and air conditioning (HVAC) systems as well as solar energy collection systems.
RADOTHERM 270 industrially inhibited ethylene glycol-based heat transfer fluid is manufactured by The Dow Chemical Company. Aqueous solutions of RADOTHERM 270 fluid are designed to provide freeze/burst and corrosion protection, as well as efficient heat transfer, in water-based, closed-loop heating and air-conditioning systems.
RADOTHERM 270 fluid has an operating temperature range of -60°F to 250°F; with fluid freeze protection to below -60°F, and system burst protection to below -100°F. The fluid contains corrosion inhibitors that are specially formulated for HVAC systems to keep pipes free of corrosion without fouling. RADOTHERM 270 fluid can be specified for use in new HVAC systems, or as a replacement fluid for use in existing systems. The fluid is dyed fluorescent pink to facilitate system leak detection.
RADOTHERM 270 fluid is also suitable for ice storage systems — used either in the closed circulation loop from the chiller to the storage medium; or, in solution with water, in the medium itself.