Molecular formula : C2H6O2
MW : 62.07
CAS No. CAS-21-1
nature : colorless liquid viscosity clarification. Solidification point -11.5 ° C, the boiling point of 198 ° C and 140 ° C (12.93kPa), 100 ° C (1.33kPa.Conclusion), 70 ° C (ECMO), 20 ° C (8.0Pa), the relative density of 1.1274 (0 / 4 ° C), 1.1204 (10 / 4 ° C), 1.1088 (20 / 4 ° C), 1.1065 (30 / 4 ° C), 1.4318 refractive index, density (vacuum, 20 ° C) 1. 11336g/ml. The flash point of 116 ° C, and viscosity (20 ° C) 21mPa s, heat capacity (20 ° C) 2.35J / (g ° C) -452.3kJ/mol molar heat of formation and dissolution heat 187.025J / g, thermal evaporation 799.14J / g, surface tension (20 ° C) 48.4mN / m, vapor pressure (20 ° C) 7.999Pa, spontaneous ° C412.8 points. With water, the lower aliphatic alcohols, glycerol, acetic acid, acetone and similar ones, aldehydes, pyridine and the like coal tar alkali Compatibility slightly soluble in ether (1:200), the almost insoluble in benzene and its homologues and chlorinated hydrocarbons, petroleum ether and oils. A sweet. With absorbent, flammable.
Preparation : 1. Ethylene oxide directly to the current water legitimate industrial-scale production of ethylene glycol is the only way. Ethylene oxide and the pressurized water (2.23MPa) and 190-200 ° C conditions, the pipe reactor direct hydration system in liquid glycol, a by-product of diethylene glycol, Triethylene glycol and ethylene glycol more condensation. Reaction from dilute solution of ethylene glycol by the film evaporator, and then dehydration, refined after that qualified products and by-products of ethylene glycol. 2. Ethylene oxide catalyst sulfate legitimate ethylene oxide and sulfuric acid catalyst in water, the 60-80 ° C ,9.806 - 19.61 kPa pressure on the water a generation glycol. The reaction solution with Ionic and by the evaporator steam to water, with 80% ethylene glycol, and the distillation column distillation thick, to be over 98% of the finished product. Act for the early development of the method, because of corrosion, pollution and product quality problems, coupled with complex refining process that has gradually out, and switch to direct water legitimate. 3. Ethylene water without a legitimate ethylene oxide and ethylene directly from the synthesis of ethylene glycol. 4. Dichloroethane hydrolysis. 5. Formaldehyde law.
purposes : preparing for major glycol cooling system of the automobile antifreeze agents and the production of Poly terephthalate (PET polyester fibers and plastic materials), can also be used for the production of its synthetic-resin, solvents, lubricants, surfactants, softener, humidifiers agent, explosives. Ethylene glycol can be a substitute for regular use glycerine, leather and pharmaceutical industries, respectively, for the mixture of water and solvents. The glycol solution capable, but it easily metabolic oxidation of toxic oxalic acid, which can not be widely used as a solvent. To add glycol hydraulic fluid to prevent oil-based hydraulic fluid system of rubber erosion; To glycol as the main component of the water-based hydraulic fluid is not a burning hydraulic fluid applied to the aircraft, automotive and high-temperature operation of the molding machine. PEG has many important derivatives. Low-molecular-weight polyethylene glycol (diethylene glycol, diethylene glycol, diethylene glycol or three were said two glycol, triethylene glycol, diethylene glycol 4) is actually ethylene oxide glycol hydration system in a by-product. Two glycol can be used as a humidifier agents, plasticizers, sizing agent, printing ink solvents, gas dehydration desiccant and aromatics extraction solvent. Two glycol dinitrate and ethylene glycol dinitrate similar, it is also an important industrial explosives. High molecular weight polyethylene glycol under the different molecular weight, viscosity transparent colorless liquid to solid cereus is a useful category of derivatives. For lubricants, water retention agents, solvents and rubber and food industries intermediates, and for preparation of cosmetics and textiles, paper making and other areas of auxiliaries. Ethylene glycol ester varieties of many widely used as solvents. Long chain fatty acid glycol ester surface with improved performance, can be used alone or with a surfactant-sharing, as emulsifiers, stabilizers, dispersant, humidifiers, foaming agents and other SC. Ethylene glycol produced by the reaction of urea and ethyl Huanya urea, used in the textile industry. Ethylene glycol and disodium 1,2-dibromoethane reaction formation of 1,4-dioxane, which is a special solvent. Right glycol using different reaction conditions or oxidizer. Oxidation available glycolaldehyde, glyoxal, glycolic acid, oxalic acid, etc..
Notice:Each item can have many explanations from different angels. If you want grasp the item comprehensively,please see below "more details data".