Application of Rectification Technology in Chemical Plant Introduction _ Process
Original Title Introduction to Application of thin film distillation Distillation Technology in Chemical Plant Introduction In the production of pharmacy and fine chemical industry there are often many liquid phase or vapor phase mixtures that need to be separated or purified Distillation technology has become the most widely used and largest mass transfer separation process Today I will tell you about the types of distillation and illustrate the process flow in actual production Distillation technology is a process in which the mixture is separated by multiple partial vaporization and multiple partial condensation under a certain pressure so as to obtain the part close to the pure state The distillation process in industrial production is a process in which the partial gasification process and the partial condensation process are organically combined in the distillation column The distillation operation is divided into continuous operation and batch operation and the equipment used is similar It mainly comprises a rectifying tower a condenser and a reboiler The column equipment used for rectification includes plate column and packed column and the plate column is commonly used Classification of distillation technology and examples of process flow in actual production Expand the full text Additive rectification The rectification method achieves the separation effect by adding a certain component (called entrainer) to form an azeotrope with one or more components in the separated system or destroy the azeotrope that may exist between the components of the original material which can be divided into extractive rectification azeotropic rectification and salt-adding rectification Azeotropic distillation Azeotropic distillation is a process of separation by using the property that substances in a mixture can form azeotropes Azeotropic distillation is the distillation of multicomponent (at least three components) non-ideal solutions According to whether the azeotrope can be separated into two immiscible liquid phases it can be divided into homogeneous azeotropic distillation and heterogeneous azeotropic distillation Process with heterogeneous azeotrope as overhead product Adding ethanol-water azeotropic mixture and entrainer benzene into tower a to obtain pure ethanol at the bottom of the tower A ternary azeotropic mixture of water ethanol and benzene is obtained at the top of the tower and enters a phase separator after being condensed to form two liquid layers in the phase separator wherein the upper layer is rich in benzene and the lower layer is rich in ethanol The benzene-rich layer winterization filtration flows back to the tower a to supplement entrainer the ethanol-rich layer enters the tower
