Why manganese dioxide is very useful in organic chemistry?
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Author : Lzh
Update time : 2023-02-05 13:36:16
What is manganese dioxide? Manganese dioxideis a black or brown square crystal, amorphous powder or lump, with a melting point of 535 ℃ (decomposition). d 5.026. It is soluble in hydrochloric acid and emits chlorine gas. It is insoluble in water, acetone, nitric acid, or concentrated sulfuric acid. Still, in the presence of hydrogen peroxide or oxalic acid, it is soluble in dilute sulfuric acid or nitric acid. It has strong oxidizability. When heated to about 200 ℃ in hydrogen, manganese dioxide and manganese tetroxide will be generated. And flammable substances, Organic substances are easy to ignite and burn in contact with hydrogen peroxide. They react explosively with hydrogen peroxide. They can ignite in contact with hydrogen sulfide. They react strongly with reducing agents.
Preparation of manganese dioxide Mix rhodochrosite powder and sulfuric acid at a mass ratio of 1:1.8~1:2.0 to produce manganese sulfate. Under normal conditions, use the circulating acid of the electrolytic cell and supplement some sulfuric acid. When pH=4, add a small amount of manganese dioxide powder to oxidize Fe2+ in the solution to Fe3+ and then add lime milk to neutralize the solution to pH near neutral. Add barium sulfide saturated solution to make heavy metal ions form sulfide precipitation. After filtration, make the electrolyte composed of MnSO4=120 ± 20 g/L, H2SO4=30 ± 10 g/L; under the temperature of 93 ± 5 ℃ and the cell voltage of 2~3 V, the electrolytic manganese dioxide product is prepared by electrolysis for 20~30 days and depositing on the anode to form blocky crude products. The crude products are often peeled, crushed, and rinsed with water. Sodium bicarbonate is added to neutralize pH=5~7, filtered, dried, and crushed.
Application of manganese dioxide Use of organic synthesis: manganese dioxide is very useful in organic chemistry. The forms of manganese dioxide used for oxides are different because manganese dioxide has multiple crystal forms. The chemical formula can be written as MnO2 · x (H2O) n, where x is between 0 and 0.5, And n can be greater than 0. Manganese dioxide can be produced in the reaction of potassium permanganate (KMnO ₄) and manganese sulfate (MnSO ₄) at different pH. One of the special chemical reactions for manganese dioxide is to convert alcohols into aldehydes; even if there are double bonds in the alcohols, It will not be oxidized by manganese dioxide: cis-RCH=CHCH2OH+MnO2 → cis-RCH=CHCHO+H2O+MnO The products will not be oxidized again even if they are more active. Glycols can be oxidized to dialdehyde by manganese dioxide. There are many other reactions of manganese dioxide, which can be used in the oxidation of amines, aromatics, and triols.
Price of manganese dioxide Manganese dioxide particle size and purity will affect the product's price, and the purchase volume can also affect the cost of manganese dioxide. A large amount of large amount will be lower. The price of manganese dioxide can be found on our company's official website.
Manganese dioxide supplier Luoyang Tongrun Nano Technology Co. Ltd. (TRUNNANO) Luoyang City, Henan Province, China, is a reliable and high-quality global chemical material supplier and manufacturer. It has more than 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including manganese dioxide, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective manganese dioxide, you are welcome tocontact us or inquire any time.
