Device and method for eliminating and recycling organic solvent from cathode electrophoresis emulsion

Abstract

The invention relates to a device and a method for eliminating and recycling organic solvent from cathode electrophoresis emulsion. The device comprises an upper tower section, a middle tower section and a lower tower section, wherein a carrier gas inlet is formed at the lower part of the lower tower section, the lower end of the lower tower section is connected with a heat exchanger of which the bottom is connected with an emulsion recover kettle, the lower end of a heat exchange tube in the heat exchanger is provided with a cold emulsion feeding hole, the upper end of the heat exchange tube is provided with an emulsion discharge hole, the emulsion discharge hole is communicated with the emulsion feeding hole at the lower end of the middle tower section by a charging pump, the upper end of the upper tower section is connected with a tower top, the tower top is externally connected with a condenser, a reflux ratio controller is arranged on the condenser, the bottom of the condenser is connected with a solvent recovery kettle, and the upper end of the condenser is connected with a vacuum pump. The method comprises the following steps: (1) vacuumizing and introducing water vapor; (2) performing reversed current heat exchange to the cathode electrophoresis emulsion, and then performing gas-liquid mass transfer in a packed tower; and (3) adjusting the reflux ratio controller and collecting emulsion and a solvent. According to the device and the method, the removal rate of organic solvent is high, zero emission is realized, the process control is stable, the operation is simple, and the recovery products have excellent performances.

Description

technical field [0001] The present invention relates to a device and method for removing and recovering organic solvents in cathodic electrophoretic emulsions, in particular to a device and method for ensuring the performance of cathodic electrophoretic emulsions, connected to multi-stage packing towers, and adopting a low-pressure steam stripping method A device and method for removing and recovering organic solvent in cathodic electrophoretic emulsion. Background technique [0002] Cathodic electrophoretic coatings are widely used as primers for automobiles, various household appliances, hardware, etc. Parts and other substrates with good conductivity or as a topcoat for non-reflective products. [0003] Most cathodic electrophoretic emulsions are stable oil-in-water emulsions formed by blending a variety of aminated modified epoxy resins or modified acrylic resins with one or more modified blocked isocyanates, neutralized by organic acids, and then emulsified with water....

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Problems solved by technology

[0007] The further technical problem to be solved by the present invention is to provide a method that overcomes the difficulty in controlling the stability of the system during the desolventization process in the prior art, the large loss of effective solvent for the feed liquid before and after desolventization, complex process operation, and imperfect solvent recovery. The problem is to efficiently remove and recover low-boiling point organic solvents under looser conditions, and to remove and recover organic solvents in cathodic electrophoretic emulsions without changing the performance of the emulsion.

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