差压热耦合精馏塔：该技术属于节能型精馏技术，是将普通的精馏塔分割为常规分离和降压分 离两个塔段， 其中常规分离塔段的操作压力与单塔精馏操作压力相同，而 降压分离塔段采用降压操作，以降低塔底温度。降压 分离塔段塔顶蒸汽经 过压缩机压缩进入常规分离塔段，常规分离塔段塔底液体由压差推动进入 降压分离塔段。降 压分离塔段降压操作可以使得其塔釜再沸物料的温度低 于常规分离塔段塔顶物料的温度，利用该两股物料的匹配 换热从而实现两 塔的高度热耦合，并利用辅助冷凝器和辅助再沸器实现整个精馏过程能耗 的完全匹配，实现节能 的目标，这便是差压热耦合精馏塔工艺。

Differential pressure thermal coupling rectification tower: This technology is an energy-saving rectification technology, which divides the ordinary rectification tower into two sections: conventional separation and pressure-reducing separation. The operating pressure of the conventional separation section is the same as that of single-tower rectification. The operating pressure is the same, and the pressure-reducing separation tower section adopts pressure-reducing operation to reduce the temperature of the bottom of the tower. The vapor at the top of the depressurization separation tower is compressed by a compressor and enters the conventional separation tower. The liquid at the bottom of the conventional separation tower is pushed into the depressurization separation tower by the pressure difference. The depressurization operation of the depressurization separation tower section can make the temperature of the reboiled material at the bottom of the tower lower than the temperature of the top material of the conventional separation tower section. The matching heat exchange of the two materials is used to achieve a high degree of thermal coupling between the two towers. The auxiliary condenser and auxiliary reboiler realize the complete matching of the energy consumption of the entire rectification process and realize the goal of energy saving. This is the differential pressure thermally coupled rectification column process