Consider new economics for purification on a small scale
For smaller methanol units, new designs balance energy cost against capital cost for long-term profitability
Crude methanol (MeOH) distillation
is an energy intensive separation process and it contributes
significantly to the total production cost. It is very
important to choose the right distillation configuration for MeOH
purification. In the following study, a two-column
configuration is compared with a three-column configuration
with forward- and backward-heat integration schemes.
Approximately 38% reduction in low-pressure (LP) steam
consumption is observed in a three-column configuration case as
compared to the base case for a small capacity plant (about
230,000 metric tpy). Further energy reductions for a
three-column configuration is possible with a backward-heat integration scheme.
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