A system and method for separating polycarbonate and solvent

Abstract

The invention relates to a polycarbonate and solvent separation system, and a method thereof. The method comprises the following steps: a solution of polycarbonate and superheated steam respectively enter the mixing zone of a mixing nozzle along the axial direction of the nozzle and a direction perpendicular to the axial direction of the mixing nozzle and are mixed, the obtained mixture enters a condenser, and condenses to form polycarbonate liquid drops on the wall of the condenser, the polycarbonate liquid drops form a polycarbonate slice under the action of gravity, the polycarbonate slice is blown into a polycarbonate slice and solvent preliminary separation system, and the polycarbonate slice and the dichloromethane solvent are preliminarily separated in the system; and the polycarbonate slice enters a steam stripper to thoroughly remove the residual dichloromethane solvent. A mixer and a condensation tube are arranged in the invention, so polycarbonate can form the slice, thereby transportation and storage are convenient; the steam stripper uses steam to strip, so the system and the method are environmentally friendly; and only one-stage stripping is carried out after slice formation of polycarbonate and polycarbonate-solvent preliminary separation, and the stripping step is simple, so the method has the advantages of energy saving and consumption reduction.

Description

technical field [0001] In particular, the present invention relates to a system and method for separating polycarbonate and solvent. Background technique [0002] The polycarbonate methylene chloride solution is mostly stripped with toluene, and the toluene is contacted with the solution in a countercurrent manner in the stripping tower to remove the solvent; this process generally requires three stages of stripping, and the first stage concentrates the solution concentration to 30%. The second stage concentrates the solution concentration to 80%, and the remaining dichloromethane and toluene are discharged from the extruder; the characteristics of this process are: long stripping steps, high energy consumption, and large exhaust load of the extruder; using toluene for stripping, There is a risk of environmental pollution; while polycarbonate powder is not easy to transport and store, and there is a risk of dust explosion. Contents of the invention [0003] The purpose of...

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Problems solved by technology

[0002] The polycarbonate methylene chloride solution is mostly stripped with toluene, and the toluene is contacted with the solution in a countercurrent manner in the stripping tower to remove the solvent; this process generally requires three stages of stripping, and the first stage concentrates the solution concentration to 30%. The second stage concentrates the solution concentration to 80%, and the remaining dichloromethane and toluene are discharged from the extruder; the characteristics of this process are: long stripping steps, high energy consumption, and large exhaust load of the extruder; using toluene for stripping, There is a risk of environmental pollution; polycarbonate powder is not easy to transport and store, and there is a risk of dust explosion

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