Acetic anhydride  ex oxidation acetaldehyde


Reaction section

Oxidation in liquid phase with oxygene , solvant Ethyl acetate (1 part acetaldehyde/2 parts of solvent)  , catalyst (cobalt acetate 1 part /copper acetate 2 part) 1% in weight/acetaldehyde , temperature 50°c  .Injection nitrogen to control the off gas leaving  the  reaction tower

Production of both   acetic anhydride  and acetic acid  : ratio 55/45
Chemical yield  acid+anhydride/acetaldehyde : 95%

Main reaction : 2CH3CHO + O2 ===> Ac2O +H2O  (exo 131 kcal) Ac2O + H2O    =====>2 AcOH  (exo 9 kcal) CH3CHO + 1/2O2 =====> CH3COOH (exo 70 kcal) main by product Ac2O + CH3CHO ==>(CH3COO)2CH-CH3 ethylidene diacetate Chemical intermediate : CH3CHO + O2  ===> CH3COOOH    peracetic acid

Separation section