mode of production
Methanol was first made by dry distillation of wood, so methanol is also called wood alcohol. After 1920, this method was gradually stopped. Almost all methanol is produced by catalytic conversion of synthesis gas (carbon monoxide and hydrogen).
The methods of producing ethanol in industry include grain fermentation, wood hydrolysis, sulfite, indirect hydration of ethylene, direct hydration of ethylene, hydrogenation of acetaldehyde, carbonyl synthesis of carbon monoxide and hydrogen, etc.
Different uses
Methanol is a commonly used mobile phase in high performance liquid chromatography and one of the famous degreasing agents. It is a basic organic chemical raw material and high-quality fuel. It is mainly used in fine chemicals, plastics and other fields to produce various organic products such as formaldehyde, acetic acid, methyl chloride, methylamine and dimethyl sulfate, and is also one of the important raw materials for pesticides and medicines.
Ethanol is the main component of wine. Ethanol can penetrate into bacteria, and at a certain concentration, protein can be coagulated and denatured, thus killing bacteria. The optimum bactericidal concentration is 75%.
toxicity
Methanol is highly toxic, while ethanol is generally harmless to human body.
structural formula
The molecular formula of methanol is written as CH3OH, and the molecular formula of ethanol is written as c? h？ o .
melting point
The melting point of methanol is -97℃, and that of ethanol is-1 14℃.
boiling point
The boiling point of methanol is 64.7℃, and that of ethanol is 78℃.
density
The density of methanol is 0.79 18 g/cm? The density of ethanol is 789kg/m? (20℃)。
flash(ing) point
The methanol is 12℃(OC) and the ethanol is 13℃, and the flash point is closed.