What are the functions of the various equipment in three-column distillation, what impurities are they used to remove, and how are the various process parameters controlled? Are there any specialized literature sources on this topic?
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Three-column distillation: Column equipment – pre-column, pressurized column, atmospheric column; Tank equipment – flash tank, pre-column reflux tank, pressurized column reflux tank, atmospheric column reflux tank, methanol sump, etc
The three-tower methanol distillation system is a highly mature process; it is essentially a two-effect heat integration process with relatively high operational energy consumption. A more advanced method is the five-tower three-effect process.