| 摘要 |
A hydrolysis method for methyl acetate is provided to raise the hydrolysis efficiency and to separate and collect the acetic acid aqueous solution and methanol of high purity by removing organic impurities contained in the methyl acetate generated from the process of producing an aromatic acid or polyvinyl alcohol. A hydrolysis method for methyl acetate comprises (a) a step of feeding a mixed solution consisting of methyl acetate(1) containing organic impurities selected from xylene, propyl acetate, benzene or their mixture, and water(2) to an extractor(21), injecting water or aromatic organic solvent in the extractor, separating organic impurities by inducing the phase separation of an aqueous phase and an organic phase, and recirculating the aqueous phase to a mixing tank; (b) a step of generating acetic acid and methanol through the hydrolysis of methyl acetate by feeding the mixed solution to a hydrolysis reactor filled with a solid acid catalyst, and feeding the reactant containing acetic acid and methanol to the upper part of the first evaporator(7); (c) a step of recirculating the un-reacted methyl acetate to the mixing tank, and feeding the mixed solution of acetic acid, methanol and water from the lower part to the second evaporator(13); and (d) a step of separating the acetic acid aqueous solution(15) and methanol(17) in the second evaporator, refluxing the condensed water by a condenser(19) of the upper part and recirculating the condensed water to the mixing tank. |
