Ethylene glycol from coal

Alternative name: Glycerol; Molecular formula: C2H6O2； Structural formula: HO-CH2CH2-OH Molecular weight: 62.068 Freezing point: -12.6°C Boiling point: 197.3°C Density: Relative density (water=1) 1.1155 (20°C) ； Relative density (air=1): 2.14. Appearance and properties: colorless, sweet-tasting, viscous liquid. Vapor pressure: 0.06 mmHg at 20°C. Flash point: 111.1°C. Viscosity: 25.66 mPa·s at 16°C. Solubility: miscible with water, ethanol, propanol, glycerol, pyridine, etc.; slightly soluble in ether; insoluble in petroleum hydrocarbons and oils. It can dissolve inorganic substances such as zinc chloride, sodium chloride, potassium carbonate, potassium chloride, potassium iodide, and potassium hydroxide. Surface tension: 46.49 mN/m (20°C). Stability: Stable. Ignition point: 418°C. Due to its low molecular weight and reactive properties, it can undergo reactions such as esterification/etherification/alkylation/oxidation/acetal formation/dehydration. It is mainly used in the production of polyester fibers, polyester resins, absorbents, plasticizers, surfactants, synthetic fibers, cosmetics, and **. It is also used as a solvent for dyes/inks, in the preparation of antifreeze for engines, as a gas dehydrant, in the manufacture of resins, and as a wetting agent for cellophane, fibers, leather, and adhesives. It can be used to produce the synthetic resin PET; fiber-grade PET is polyester fiber, while bottle-grade PET is used to make mineral water bottles and similar items. Alkyd resins, glyoxal, and others can also be produced; it is also used as an antifreeze. In addition to being used as an antifreeze in automobiles, it is also used for transporting industrial cooling capacity, and is generally referred to as a coolant.