| 摘要 |
A REACTOR FOR THE OXIDATION OF A PRECURSOR TO AN AROMATIC CARBOXYLIC ACID OR ESTER THEREOF IN A LIQUID PHASE REACTION MIXTURE IS DISCLOSED. THE REACTOR COMPRISES AN ELONGATE VESSEL, SUBSTANTIALLY VERTICAL IN USE, HAVING AN UPPER MIXING ELEMENT AND A LOWER MIXING ELEMENT, CHARACTERISED IN THAT THE UPPER MIXING ELEMENT IS AN AXIAL PUMPING IMPELLER AND THE LOWER MIXING ELEMENT IS A RADIAL PUMPING IMPELLER. A PROCESS OF PRODUCING A CARBOXYLIC ACID OR ESTER THEREOF IN A REACTOR OF THE INVENTION IS ALSO DISCLOSED. IN USE, THE CONFIGURATION OF MIXING ELEMENTS LEADS TO THREE HIGHLY TURBULENT MIXING ZONES. IN A PREFERRED EMBODIMENT OF THE PROCESS OF THE PRESENT INVENTION OXIDANT, FROM ONE INLET, AND SOLVENT, PRECURSOR AND CATALYST, ARE INTRODUCED DIRECTLY INTO A MIXING ZONE. THE HIGHLY TURBULENT MIXING ZONES LEAD TO RAPID MASS TRANSFER SUPPRESSING THE FORMATION OF UNWANTED, COLOURED BY-PRODUCTS AND REDUCED REACTOR FOULING.FIG.1
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