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acetic acid
[Physical and chemical properties] Acetic acid, also known as acetic acid , has a molecular formula of CH 3 CHOOH.
[Preparation method] Acetic acid can be prepared by artificial synthesis and biological fermentation
Preparation method 1 Light hydrocarbon liquid phase oxidation method
N-butane and light naphtha (containing low-boiling hydrocarbons, especially pentane and hexane) undergo liquid phase oxidation to produce acetic acid.
Preparation method 2 acetaldehyde oxidation method
In the presence of manganese acetate (or cobalt, copper) catalyst, acetaldehyde air (or pure oxygen) undergoes liquid phase oxidation to generate acetic acid
2CH 3 CHO+O 2 →2CH 3 COOH
When air is used as the oxidant, the reaction temperature is 55-60°C and the pressure is generally 800kPa; when pure oxygen is used for oxidation, the reaction temperature is slightly higher, about 70-80°C, and the pressure needs to make the acetaldehyde in the liquid phase
The raw material routes of this method include calcium carbide acetylene, ethanol, petroleum ethylene and so on
Preparation method 3 Direct oxidation of ethylene
The process for preparing acetic acid by direct oxidation of ethylene was successfully developed by Showa Denko Co.
Preparation method 4 Selective catalytic oxidation of ethane
The selective catalytic oxidation of ethane to prepare acetic acid was first developed by UCC in the 1980s and put into pilot test.
Preparation method 5 methanol carbonylation method
The methanol carbonylation method is a method in which methanol and carbon monoxide are present in the presence of a catalyst to synthesize acetic acid in the next step
CH 3 OH+CO→CH 3 COOH
The methanol carbonylation method is divided into a high-pressure method and a low-pressure method
(1) Monsanto/BP process
In 1966, on the basis of BASF technology, Monsanto (Monsanto) in the United States successfully developed a catalyst that replaced cobalt with rhodium or iridium and a soluble catalyst system with iodine as the activator.
