Light solvent recovery device for field of dangerous waste treatment, skid-mounted structure therefor and light solvent recovery method

Abstract

The invention provides a light solvent recovery device for the field of dangerous waste treatment, a skid-mounted structure therefor and a method. The recovery device comprises a rectification tower,wherein a charging opening of the rectification tower is connected with a rectifying still, a tower top gas-phase outlet is connected with a condenser, an outlet of the condenser is connected with a reflux ratio controller and a phase splitter separately, one outlet of the reflux ratio controller is connected with a liquid-phase reflux inlet of the rectification tower, the other outlet of the reflux ratio controller is connected with a product gathering tank and a transition cut gathering tank separately, one outlet of the phase splitter is connected with a reflux liquid gathering tank, the other outlet of the phase splitter is connected with a waste receiving tank, the reflux liquid gathering tank is connected with the liquid-phase reflux inlet of the rectification tower, a liquid-phase outlet of the rectification tower is connected with the rectifying still, an outlet of the rectifying still is connected with a gas-phase reflux inlet of the rectification tower, and a liquid-phase outlet of the rectifying still is connected with a buffering device. According to the device, different light solvents can be separated and recovered from waste liquor of different sources and differentcompositions by one set of device; and the recovery device is convenient in mounting, dismounting and moving of the skid-mounted structure, centralized in equipment distribution and small in floor area.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment, and in particular relates to a light solvent recovery device in the field of hazardous waste treatment, its skid-mounted structure and a light solvent recovery method. Background technique [0002] Hazardous waste refers to hazardous waste, which refers to waste with hazardous characteristics that is included in the national hazardous waste list or identified according to the national hazardous waste identification standards and identification methods. In industrial production, a large amount of hazardous waste is often produced, including solid waste and liquid waste. Waste, liquid waste is mainly the waste liquid discharged by industry, and the waste liquid often contains a large amount of liquid that can be used as a solvent. These solvents still have usable value. If they are directly disposed of as waste, it will cause a waste of resources. It is necessary to recycle it. A...

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Problems solved by technology

[0003] Light solvents generally refer to soluble or slightly soluble solvents with a boiling point between 100-150°C, such as methanol, ethanol, isopropanol, acetone, butanone, tetrahydrofuran, acetonitrile, methylene chloride, hexane, etc. These solvents are chemical Solvents commonly used in engineering, their recycling can greatly save resources, and because their boiling point, density, viscosity and other properties are relatively close, similar methods can be used to adjust the separation conditions for separation and recovery. However, a set of devices is not used in the prior art A device that can separate and recover different light solvents from waste liquids of different sources and compositions

[0004] In addition, most of the hazardous waste solvent recovery and treatment devices in the prior art are installed in fixed positions, and the installation, connection, and disassembly of various equipment are very inconvenient. When the waste liquid is processed, the waste liquid needs to be transported to a fixed location for processing, and the operation is also difficult. Very inconvenient, and the installation of each device in the device is scattered, occupying a large area

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