Background and overview[1][2]
Ethylene glycol is a colorless, odorless, sweet-tasting viscous liquid that can be used to make resins, plasticizers, synthetic fibers, cosmetics, explosives, solvents, antifreeze, etc. Ethylene glycol has the chemical properties of alcohols, such as it can generate ethers and esters, can be oxidized, and can be condensed. It reacts with nitric acid to form ethylene glycol dinitrate, an explosive.
Ethylene glycol is mainly used as automobile antifreeze and aircraft engine refrigerant. In addition, it can also be synthesized into polymer compounds such as polyester fiber. The combined use of ethylene glycol dinitrate and nitroglycerin can lower the freezing point of explosives. Ethylene glycol can also be used as a raw material for pharmaceuticals and plastics and as a high-boiling point solvent.
Apply[3-4]
CN201110391363.9 discloses a method for preparing spherical γ-bismuth oxide powder, which includes the following steps: first, Bi(NO3)3·5H2O is added to ethylene glycol and stirred to dissolve; while stirring, add NaOH solution, water and polyethylene glycol in turn to the prepared bismuth salt solution, and stir to obtain a reaction liquid; The liquid is added into a hydrothermal reactor with a polytetrafluoroethylene substrate, and the hydrothermal reaction to generate Bi2O3 is carried out in a sealed state; the result will be The materials are cooled to room temperature, and then filtered, washed, and dried sequentially to obtain the finished γ-Bi2O3 powder. The γ-Bi2O3 prepared by the invention has a relatively uniform morphology and good dispersion; its microstructure is spherical, and the spherical shape is further spherical. , with a diameter of 1 to 25 μm, and a spherical shape with a large specific surface area; the thickness of the nanosheets that make up the microspheres is below 100 nm, with good visible light response and high photocatalytic activity.
CN201210500911.1 discloses a method for preparing flake nanosilver powder, which is obtained by reacting a silver aqueous salt solution containing a surfactant and a ferrous salt solution at a temperature of 0 to 100°C. The silver salt is silver nitrate, silver sulfate or silver acetate. The surfactant is polyvinylpyrrolidone, cetyltrimethylammonium bromide, sodium lauryl sulfate or polyethylene glycol. The ferrous salt is ferrous ammonium sulfate or ferrous sulfate. The weight ratio of the silver salt to the ferrous salt is 2:1~1:4. The weight ratio of the silver salt to the surfactant is 50:1~1:2. The flaky nanometer silver powder finally obtained by the method of the invention has a single shape and high purity. The method of the invention also has the advantages of short reaction time, high efficiency, mild reaction conditions, simple process and equipment, low production cost, easy operation, green and pollution-free, and is particularly suitable for industrial large-scale production.
Main reference materials
[1] Health Dictionary
[2] Practical Poisoning First Aid Digital Manual
[3] CN201110391363.9 Preparation method of spherical γ-bismuth oxide powder
[4] CN201210500911.1 Preparation method of flaky nano-silver powder
