对苯二甲酸是一种重要的化工原料，对苯二甲酸生产工艺中精制单元会产生150℃、0.5 MPa的母液，具备一定的利用潜力。目前多采用溴化锂吸收式热泵或是有机朗肯循环回收该部分余热，但是存在投资周期长、热利用率低的问题。针对该问题探讨了新的高效余热回收利用方式，并与其他方式对比得到了较优的方案。结果显示，采用螺杆水蒸汽热泵将常压蒸汽直接压缩至0.5 MPa后利用的方案能够减少高压蒸汽或燃料油的消耗，具有投资少、收益高、余热利用效率高等优点。

Pure terephthalic acid (PTA) is an important chemical raw material.A mother liquor at 150℃ and 0.5 MPa can be generated in the refining unit of PTA production process,which has a certain potential for heat recovery.At present,LiBr Absorption Heat Pump or Organic Rankine Cycles methods are often employed to recover heat from this mother liquor,but they both face problems of long investment period and low heat utilization rate.In the light of these problems,a new high-efficiency heat recovery method is proposed,and compared with other methods to get a better solution.The results show that Screw Steam Heat Pump is directly employed to compress atmospheric steam to 0.5 MPa steam,which can reduce the consumption of high-pressure steam or fuel oil,showing the advantages of low investment,high profit,and high heat utilization efficiency.