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    • 2. 发明申请
    • Continuous method for preparing ethyl lactate
    • 连续制备乳酸乙酯的方法
    • US20060014976A1
    • 2006-01-19
    • US10537150
    • 2003-12-05
    • Georges Martino-GauchiRemy Teissier
    • Georges Martino-GauchiRemy Teissier
    • C07C67/08
    • C07C67/08C07C69/68
    • The invention concerns a continuous method for preparing ethyl lactate by esterifying lactic acid with ethanol, in the presence of a catalyst which consists in reacting said lactic acid with ethanol in an initial ethanol/lactic acid mol ratio not less than 2.5, in the presence of a catalyst, at a reflux of the reaction medium of about 100° C. under absolute pressure ranging between 1.5 to 3 bars. Said method is characterized in that it consists in continuously extracting from the esterification reaction medium a near-azeotropic water/ethanol gas mixture; then in dehydrating said gas mixture directly using molecular sieves, then recuperating from said dehydration an ethanol gas stream capable of being recycled to the esterification reaction medium and a flow consisting of water and ethanol which is subjected to distillation wherefrom is obtained water and an azeotropic water/ethanol mixture which is injected into the distillation column head of the gas mixture extracted from the esterification reaction medium; then in continuously extracting crude ethyl lactate which is subjected to purification wherefrom are obtained high purity ethyl lactate and heavy products.
    • 本发明涉及通过在乙醇中酯化乳酸,在催化剂存在下制备乳酸乙酯的连续方法,所述催化剂包括在初始乙醇/乳酸摩尔比不小于2.5时使所述乳酸与乙醇反应, 催化剂,在反应介质的回流下,在绝对压力范围为1.5至3巴之间约100℃。 所述方法的特征在于其从酯化反应介质中连续提取近共沸水/乙醇气体混合物; 然后使用分子筛直接使所述气体混合物脱水,然后从所述脱水中回收能够再循环到酯化反应介质的乙醇气流和由水和乙醇组成的流,其中得到水和共沸水 /乙醇混合物,其被注入从酯化反应介质中提取的气体混合物的蒸馏塔头中; 然后连续提取经过纯化的粗乳酸乙酯,得到高纯度乳酸乙酯和重质产物。