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In distillation columns with condenser temperatures significantly below room temperature, such as in demethanizer towers, it is essential to minimize the expensive energy requirements of the refrigeration cycle that produces the tower reflux. A partial solution can be found by expanding the gaseous distillate to decrease its temperature; another solution is to use the cooler distillate to reduce the temperature of the tower feed. In this way, it has been shown that precooling only part of thedoi:10.1021/ie051343e fatcat:72r6z4qhgrdfja5n4gscciouca