The utility model relates to a direct spinning equipment technical field, especially, waste heat recovery that esterifies heats rectifier unit, it includes the technology tower, the air cooler, the backward flow collection tank, the backflow water delivery pump, CPEG jar and CPEG delivery pump, still include a heat exchanger and no. Two heat exchangers, the output pipeline of technology top of the tower portion respectively with the air cooler, a heat exchanger, no. Two the heat exchanger is connected, a heat exchanger, comdenstion water exit tube on no. Two heat exchangers is connected to the backward flow collection tank, the backward flow collection tank is connected to the technology tower through the backflow water delivery pump, the CPEG jar passes through heat exchanger of CPEG delivery pump parallel connection, no. Two heat exchangers and technology tower. The utility model relates to a waste heat recovery that esterifies heats rectifier unit, the high temperature water vapor that utilized esterification reaction to produce heats CPEG, both can reduce to be used for the high temperature water vapor cooling and the electric energy that consumes, also can reduce simultaneously the CPEG heating and the electric energy that consumes, the very big energy cost of having saved.