Solvent recovery method and device for organic solvent-containing dye and coating waste

Abstract

The invention provides a solvent recovery method and a solvent recovery device for organic solvent-containing dye and coating waste. By the solvent recovery method, a container in which the waste is accommodated is directly subjected to induction heating through an induction heating coil, so that an organic solvent in the waste is distilled and recovered. The solvent recovery device consists of a top cap, an object stage, the induction heating coil, a condenser, an exhaust fan, a regenerated solvent storage tank and an electrical control cabinet. The invention has the prominent advantages that: the recovery method and the recovery device can be applied to the organic solvent recovery of dye and coating waste which contains the organic solvent, such as a waste dye, waste ink, a waste paint and the like with high viscosity, and the solvent recovery of other waste liquor which contains the organic solvent, and various organic solvents in a mixed organic solvent contained in the waste can be recovered and extracted in the one-time recovery process respectively.

Description

technical field [0001] The invention relates to the field of treatment methods and equipment for dye paint waste, in particular to a method and device capable of recovering organic solvents in dye paint waste containing organic solvents. Background technique [0002] The excellent dissolving ability of organic solvents makes them widely used as solvents or diluents in the manufacturing industry of coatings, inks, paints and synthetic leather. For example, in the production process of the polyurethane synthetic leather industry, the amount of organic solvents in polyurethane resin coatings accounts for more than 60%, and the amount of organic solvents in wet slurry reaches more than 70%. The amount of organic solvents in the preparation process also accounts for more than 50% of paint and ink coatings. This means that in the coating, ink, pigment and related product manufacturing industries, the coating, paint and ink waste generated during the production, formulation and us...

AI Technical Summary

Problems solved by technology

[0004] (1) Although the solvent can be distilled and recovered from the waste liquid, various organic solvents contained in the waste liquid cannot be recovered and extracted separately in one recovery process

The regenerated organic solvents recovered can generally only be used as cleaning solvents for mechanical equipment, etc., and the scope of use is greatly limited

[0005] (2) It is not suitable for recycling organic solvents in waste paints, waste inks, waste paints and other dyes and paints containing organic solvents with high viscosity, because such wastes have poor fluidity and low heat transfer efficiency on the one hand. Solvent recovery is difficult and inefficient. On the other hand, the resin residue left on the inner wall of the still and the agitator after solvent recovery is difficult to clean up.

Although the existing solvent recovery machine is equipped with a stirrer in the still to improve the fluidity of high-viscosity waste, in order to avoid resin residues remaining on the still wall, a scraper structure is set in the still, or adding Inner high-temperature plastic bags are used, but the resin residue left on the agitator and scraper is generally difficult to clean up. In addition, the use of inner plastic bags in the still not only affects the processing speed but also increases the processing cost.

[0006] (3) Steam or oil bath heating is mostly used, which has the problems of slow heating speed and long cooling standby time

If it is used for the recovery and treatment of organic solvents in dye paint wastes containing organic solvents such as waste paints, waste inks, and waste paints with high viscosity, the fluidity of such wastes in the stills is generally poor, resulting in The heat exchange efficiency is relatively low, which makes the treatment process very long

[0007] (4) The processing capacity is generally small, not suitable for batch recycling

[0008] (5) The loading and unloading process is time-consuming and laborious

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