反应详情

The column reactor of Example 1 was used to investigate the esterification of monoethyl maleate (MEM) with ethanol (EtOH) to form diethyl maleate (DEM). The resin loadings of the trays were the same as in Example 3. The acid feed to tray No. 2 had the following composition in mole %: H2O 25.9; EtOH 20.3; DEM 10.4; diethyl fumarate (DEF) <0.1; MEM 39.4; monoethyl fumarate (MEF) 0.1; maleic acid (MAC) 3.9; fumaric acid (FAC) <0.1; diethyl ethoxysuccinate (EDES) <0.1. A wet ethanol replaced the dry methanol used in Examples 1 to 3; this had the following composition in mole %: EtOH 84.2; H2O 15.8. The residence time in the column reactor was approximately 2.7 hours. The feed rates were 680 g/hr acid feed and 390 g/hr EtOH. The results are shown in Table IV.