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通过加入乙酸盐例如乙酸钠与乙酸和水结合形成固体化合物,从含有乙酸的含水或不含水的混合物中分离乙酸酐。固体化合物可以先加热以蒸馏出乙酸,然后蒸馏出水,或者将化合物与溶剂如苯一起在120-140℃下在加压条件下加热,从而使乙酸游离。该方法可以在惰性溶剂如苯,甲苯,二甲苯,乙酸乙酯或二氧化硫存在下进行。在实施例中,(1)和(2)将乙酸酐和乙酸的混合物,如果需要加入环己醇与乙酸钠一起振摇并过滤;(3)将乙酸酐,乙
The acetic anhydride is separated from the aqueous or non-aqueous mixture containing acetic acid by the addition of an acetate such as sodium acetate in combination with acetic acid and water to form a solid compound. The solid compound may be heated to distill out the acetic acid and then the water is distilled off or the compound is heated under pressure with a solvent such as benzene at 120-140 ° C to free the acetic acid. The process can be carried out in the presence of an inert solvent such as benzene, toluene, xylene, ethyl acetate or sulfur dioxide. In the examples, (1) and (2) a mixture of acetic anhydride and acetic acid, if required, is added with cyclohexanol and shaken with sodium acetate and filtered; (3) acetic anhydride,