On the effective separation of alcohol/water from esters during esterification reactions
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Hello, teachers and classmates! I have a question: during multi-step esterification reactions, it is necessary to remove the alcohol added in each step as well as the water formed at that time. However, when removing this alcohol and water, a significant amount of ester is often carried away as well. Is there any effective method for proper separation? The current setup involves a packed column and a condenser in the process of removing alcohol from water, thereby enabling some reflux in that removal process.
For the synthesis of mild esters (methyl, ethyl, and propyl esters), since alcohol and water are miscible, an excess of acid is generally used in industry to facilitate separation. The reaction distillate generally needs to be distilled before the alcohol can be recovered and reused. In the esterification reaction, the product ester, water, and the alcohol reactant evaporate together in an azeotropic manner; after condensation and separation, the oil phase is returned to the reaction, while the separated water is then used to recover the organic compounds contained within it. In the laboratory, a demister can be added to the condensate of the distillate; the oil phase (the upper layer) is returned, while the lower layer of water is discarded.
The answer is excellent! Control the temperature, increase the length of the packing column, or replace the packing.
If there isn’t much water, use a salt column to remove water first, and then distill methanol for application