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Hydrodynamic cavitation describes the process of vaporisation, bubble generation and bubble implosion which occurs in a flowing liquid as a result of a decrease and subsequent increase in local pressure. Cavitation will only occur if the local pressure declines to some point below the saturated vapor pressure of the liquid and subsequent recovery above the vapor pressure. If the recovery pressure is not above the vapor pressure then flashing is said to have occurred. In pipe systems, cavitation typically occurs either as the result of an increase in the kinetic energy (through an area constriction) or an increase in the pipe elevation.

Short-path distillation (also called Molecular distillation ),  is a distillation technique that involves the distillate travelling a short distance, often only a few centimeters, and is normally done at reduced pressure. It is a thin film evaporator(TFE). Many such as heavy petroleum residues, chemicals, medicines and natural foods, health products, fatty acids, etc., are often heat-sensitive, viscous and / or have high boiling point materials. To separate these materials from their other components and maintain the quality of the product, they can only be rectified at a low boiling temperature or less than the boiling temperature, and only in a short time, thermal decomposition Or polymerization is reduced to eliminate damage to the product.

Fundamental: Acetone and methanol are also commonly used organic solvents in the pharmaceutical industry, and the pharmaceutical process often involves the separation, recovery and reuse of the mixed solution of acetone and methanol. Since methanol (boiling point 64.7 ?) and acetone (boiling point 56.5 ?) are similar in boiling point, it is easy to form an azeotrope, so it is difficult to separate it by general distillation. Extractive distillation is widely used as a common method for separating azeotropes, so the choice of extraction efficiency has become the top priority of extractive distillation.