Recycling device for heavy solvents in dangerous waste treatment field, skid-mounted structure and recycling method for heavy solvents thereof

Abstract

The invention provides a recycling device for heavy solvents in dangerous waste treatment field, a skid-mounted structure and a recycling method thereof. The recycling device comprises a rectifying tower; a gaseous phase outlet on the top of the rectifying tower is connected with a condenser; the condenser is connected with a reflux ratio control device; one outlet of the reflux ratio control device is connected with a liquid backflow inlet of the rectifying tower while the other outlet is respectively connected with an effluent collecting device, a transition distilling collecting device anda product collecting device; a liquid outlet on the bottom of the rectifying tower is connected with an inlet of a rectifying kettle; a gaseous phase outlet of the rectifying kettle is connected witha gaseous phase backflow inlet of the rectifying tower; the liquid outlet of the rectifying kettle is connected with the inlet of an evaporator; a steam outlet of the evaporator is connected with thecondenser; the outlet of the condenser is respectively connected with a plurality of product collecting device; the outlet of the transition distilling collecting device is connected with the inlet ofthe rectifying kettle through a pipeline; a feeding pump is arranged on the pipeline. The device can be used for separating and recycling different heavy solvents from effluents from different sources or containing different components; the skid-mounted structure can be conveniently mounted, dismounted and moved; the equipment arrangement is intensive; less area is occupied.

Description

technical field [0001] The invention belongs to the technical field of hazardous waste treatment, and in particular relates to a heavy solvent recovery device in the field of hazardous waste treatment, its skid-mounted structure and a heavy 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] Heavy solvents generally refer to solvents with a boiling point higher than 150°C, such as N-methylformamide, N-methylacetamide, N-methylpyrrolidone, cyclohexane, dimethyl sulfoxide, ethylene glycol, etc., these solvents Slow volatilization and good solubility, it is a commonly used solvent in chemical engineering, its recycling can greatly save resources, and because its 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, In the prior art, a device that can separate and recover different heavy solvents from waste liquids of different sources and compositions without using a set of devices

[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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