Corrections? Ethylene glycol, also called ethane-1,2-diol, the simplest member of the glycol family of organic compounds. 0000264493 00000 n Get exclusive access to content from our 1768 First Edition with your subscription. Author of. 0000025351 00000 n The density of ethylene glycol is higher than water - check the specific gravity (SG) table above, so the net impact on the heat transport capacity is reduced. 0000007568 00000 n Ethylene glycol is a clear, sweet, slightly viscous liquid that boils at 198 °C (388.4 °F). This chemistry permits ethylene glycol to act as an intermediate in a wide range of reactions. The name ethylene glycol refers literally to “the glycol made from ethylene.” Its systematic name is ethane-1,2-diol. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. Increase in circulated flow for 50% ethylene glycol solutions compared with clean water are indicated in the table below, Pressure drop correction and combined pressure drop and flow increase correction for 50% ethylene glycol solutions compared with clean water are indicated in the table below. Ethylene glycol is also used to make polyester fibers and PET plastic, to de-ice airplanes, and in the mining industry to keep chunks of coal from sticking together. AddThis use cookies for handling links to social media. 0000022724 00000 n The net impact can be estimated to 0.815 * 1.077 = 0.877. Eaٷ�K�����"R@�=R�U��F, ^�l2 {������. Specific gravity - SG - of ethylene glycol based water solutions at various temperatures are indicated below. Professor of Chemistry, Whitman College, Walla Walla, Washington. 0000000956 00000 n A heating system with liquid volume 0.8 m3 is freeze protected with 50% (by mass, mass fraction 0.5) ethylene glycol. Ethylene glycol is also commonly used in heating applications that temporarily may not be operated (cold) in surroundings with freezing conditions - such as cars and machines with water cooled engines. 0000003247 00000 n As a consequence the head loss (pressure loss) in the a piping system with ethylene glycol is increased compared to clean water. A glycol is an alcohol with two hydroxyl groups on adjacent carbon atoms (a 1,2-diol). 0000003147 00000 n Ethylene glycol is highly poisonous; animals or humans that drink the solution become very ill and may die. The common name ethylene glycol literally means “the glycol derived from ethylene.”. 0000002850 00000 n ethylene glycol as an antifreeze is based on its ability to lower the freezing point when mixed with water. 0000003362 00000 n Note! Specific gravity at the same conditions is 1.077. Specific gravity at the same conditions is 1.077. 0000022974 00000 n Note! 0000023125 00000 n 0000007216 00000 n Ethylene Glycol based water solutions are common in heat-transfer applications where the temperature in the heat transfer fluid can be below 32oF (0oC). Ethylene glycol is highly poisonous; animals or humans that drink the solution become very ill and may die. Ethylene Glycol – The Versatile Performer A 1:1 solution of ethylene glycol and water boils at 129 °C (264.2 °F) and freezes at −37 °C (−34.6 °F), serving as an excellent coolant in automotive radiators. If you want to promote your products or services in the Engineering ToolBox - please use Google Adwords. 0000346799 00000 n 0000021699 00000 n 0000355821 00000 n 0000350731 00000 n New content will be added above the current area of focus upon selection 0000022256 00000 n The density of ethylene glycol is higher than water - check the specific gravity (SG) table above, so the net impact on the heat transport capacity is reduced. Some of our calculators and applications let you save application data to your local computer. Updates? These applications will - due to browser restrictions - send data between your browser and our server. In a 50% solution with operational temperatures above 36 oF the specific heat capacity is decreased with approximately 20%. Instead solutions based on propylene glycol are commonly used. The installation temperature of the system is down to 0oC and the maximum medium operation temperature is 80oC. 0000351126 00000 n 1801 0 obj <> endobj xref 1801 33 0000000016 00000 n Systems for automatic makeup water should not be used since a leakage would contaminate the environment and dilute the antifreeze protection of the system. 0000021658 00000 n Ethylene glycol should be avoided if there is a slightest chance of leakage to potable water or food processing systems. Especially significant is resin formation, including the condensation with dimethyl terephthalate or terephthalic acid resulting in … Ethylene glycol is a clear, sweet, slightly viscous liquid that boils at 198 °C (388.4 °F). 0000331244 00000 n Example - the specific heat of an ethylene glycol water solution 50% / 50% is 0.815 at 80 o F (26.7 o C). Note! Dynamic viscosity - μ- of ethylene glycol based water solutions at various temperatures are indicated below. %PDF-1.4 %���� Example - the specific heat of an ethylene glycol water solution 50% / 50% is 0.815 at 80 oF (26.7 oC). The physical properties of ethylene glycol-water mixtures are therefore extremely important. This is a brief description of the properties of the ethylene glycol for industrial porpouses TCCs Ethylene Glycol (MEG) is a toxic, colorless, practically odorless, low-volatility, low-viscosity, hygroscopic liquid. 0000002466 00000 n The end uses for ethylene glycol are numerous (See Table 1). For full table with Boiling Points - rotate the screen! We don't save this data. 0000002680 00000 n hެVkL�g>�����EPڊ\l� "����]� 0000007919 00000 n Let us know if you have suggestions to improve this article (requires login). For a heat transfer system with ethylene glycol the circulated volume must be increased compared to a system only with water. Its most common use is as an automotive antifreeze. 0000022823 00000 n In addition to its use in antifreeze, ethylene glycol is used as an ingredient in hydraulic fluids, printing inks, and paint solvents. Silicates in automobile antifreeze are used to protect aluminum engine parts. Omissions? Our latest podcast episode features popular TED speaker Mara Mintzer. Cookies are only used in the browser to improve user experience. Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse! City water may be treated with chlorine which is corrosive. https://www.britannica.com/science/ethylene-glycol, National Center for Biotechnology Information - PubChem - Ethylene glycol, The Essential Chemical Industry - Ethylene glycol, Centers for Disease Control and Prevention - Ethylene Glycol, Hyperphysics - Ethylene and Propylene Glycol. Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected. Note! Finally, ethylene glycol, which is widely used as an antifreeze agent in automobiles, causes renal damage when it is biotransformed to oxalic acid, which crystallizes in the renal tubule (Table 2).…, …freezing temperature decreases appreciably when ethylene glycol is mixed with water.…. Please read AddThis Privacy for more information. We don't collect information from our users. The reduced heat capacity must be compensated by circulating more fluid. 0000346310 00000 n Only emails and answers are saved in our archive. Freezing points of ethylene glycol based water solutions at various temperatures are indicated below. 0000351637 00000 n The specific heat of ethylene glycol based water solutions are less than the specific heat of clean water. Properties differs so much from clean water that heat transfer systems with ethylene glycol should be calculated thoroughly for actual temperature and solution. Its most common use is as an automotive antifreeze. Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications! Specific heat, viscosity and specific weight of a water and ethylene glycol solution vary significantly with the percent of ethylene glycol and the temperature of the fluid. The hydroxyl groups on glycols undergo the usual alcohol chemistry, giving a wide variety of possible derivatives. Due to possible slush creation, ethylene glycol and water solutions should not be used in conditions close to freezing points. The specific gravity of ethylene glycol based water solutions are increased compared with specific gravity of clean water. head loss (pressure loss) in the a piping system, Freezing point 100% ethylene glycol at atmospheric pressure is, en: ethylene glycol water solutions freezing, es: etilenglicol soluciones de agua de congelación, de: Ethylenglykol-Wasser-Lösungen Gefrieren. From the table above we see that the density of the solution at installation temperature can be as high as 1090 kg/m3 - and the medium density at operation temperature can be as low as 1042 kg/m3. It is completely miscible with water and many organic liquids. You can target the Engineering ToolBox by using AdWords Managed Placements. �%3��m�B�mDz? Ethylene Glycol is the most common antifreeze fluid for standard heating and cooling applications. The mass of the liquid at installation can be calculated as, minst = ρinst Vinst                               (1), minst = mass of liquid at installation (kg), Vinst = liquid volume at installation (m3), Mass of the liquid in the system during operation will be same as the mass in system during installation, minst = mop                              (2), (2) can be modified to calculate liquid operation volume as, Vop = minst / ρop                             (2b), The required expansion volume to avoid pressure can be calculated as, ΔV = Vop - Vinst                        (3), ΔV = (ρinst / ρop - 1) Vinst                  (4), Specific Heat - cp - of ethylene glycol based water solutions at various temperatures are indicated below. trailer <]/Prev 1199023/XRefStm 2466>> startxref 0 %%EOF 1833 0 obj <>stream 0000024024 00000 n 0000008674 00000 n Automobile antifreeze solutions should not be used in HVAC systems because they contain silicates that may cause fouling.