Pressure-sensitive pinch features that in a certain concentration zone, the equilibrium vapor composition of one key component is fairly close to its liquid composition and that the vapor composition significantly shifts with pressure variations. This characteristic, quite similar to that of pressure-sensitive azeotrope, could offer significant economic potential, but it receives little attention previously. In this work, a systematic procedure is presented via “pinch or not?” judgment to ensure always achieving the economic optimal distillation design for universal systems. Pinch definition and possibilities is quantitatively defined and the criterion, formation and transformation of pinch zone are systematically proposed. Three cases are employed to demonstrate the economic potential, confirming effectiveness of the presented procedure. It should be stressed that chemical engineer shall take full advantage of the particularity of pressure-sensitive pinch/azeotrope to achieve possible economic potential.

压敏收缩的特征是，在某个浓度区域中，一种关键成分的平衡蒸气组成非常接近其液体组成，并且蒸气组成会随压力变化而明显移动。该特性与压敏共沸物非常相似，可提供巨大的经济潜力，但以前很少受到关注。在这项工作中，通过“捏还是不捏？”提出了系统的程序。确保始终实现通用系统的经济最佳蒸馏设计的判断力。定量定义了捏的定义和可能性，并系统地提出了捏区域的标准，形成和转变。使用三个案例来证明其经济潜力，证实了所提出程序的有效性。