发明名称 |
CONTINUOUS METHOD FOR PREPARING ETHYL LACTATE |
摘要 |
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 DEG 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. |
申请公布号 |
WO2004052826(A2) |
申请公布日期 |
2004.06.24 |
申请号 |
WO2003FR03599 |
申请日期 |
2003.12.05 |
申请人 |
ATOFINA;MARTINO-GAUCHI, GEORGES;TEISSIER, REMY |
发明人 |
MARTINO-GAUCHI, GEORGES;TEISSIER, REMY |
分类号 |
C07C67/08 |
主分类号 |
C07C67/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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