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Advantages: The modular design reduces the number of devices such as reflux tanks, reflux pumps, and reflux control systems, thus saving space. Disadvantages: It is difficult to control, and the reflux ratio cannot be precisely regulated； Difficult to maintain the condenser ； The flange connecting the condenser and the distillation tower is located in an area with alternating hot and cold conditions, resulting in stress concentration ； As the height of the equipment increases, the height of the frame will increase as well ； The piping of condensers is challenging; due to the limitations imposed by the external diameter of the distillation tower, it is possible to increase the heat exchange area only by extending the length of the tubes ； Gas and liquid come into counterflow contact inside the tubes, and liquid resistance is likely to occur under high loads

Energy savings, reduction in the need for equipment and pipelines, less space required by the equipment…… It just seems like something is missing from the upper part.