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1·Promotion of added side withdrawing technology and heat pump recovery process for energy conservation and emission reduction of the prefractionator is made.

考察了理论板数、进料位置等对蒸汽消耗量及废水排放的影响；研究了增加侧采工艺和热泵回收工艺对节能减排的促进作用。

2·Meanwhile, the author points out that, with the prefractionator, the heat exchanger network of the unit should be rearranged and some holes of the middle and lower trays of the prefract…

同时指出，针对增设初馏塔以后的情况，应调整装置换热网络及调整分馏塔中、下段的开孔率。