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Recycling device for solvents with high freezing point and high viscosity in dangerous waste treatment field, skid-mounted structure and method thereof

A solvent recovery device and high freezing point technology, applied in separation methods, chemical instruments and methods, distillation separation, etc., can solve problems such as high surface tension of solvents, difficulties in separation and recovery, blockage of device pipelines, etc., to reduce residence time and move Flexible and convenient, the effect of using the installation space

Pending Publication Date: 2018-12-07
TIANJIN ZHONGFU ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some solvents in industry have higher freezing point (high freezing point refers to freezing point temperature above 20°C) and higher viscosity, such as dimethylacetamide, butyl acetate, polymethyl acrylate, xylene, etc., in the separation and recovery On the one hand, this kind of solvent is easy to condense into a solid state during the condensation process due to its high freezing point, which will block the pipeline of the device and affect the separation efficiency. On the other hand, due to its high viscosity, its fluidity is poor, and the solvent surface The tension is high, and it is easy to stick to the separation equipment, so it is very difficult to separate and recover such solvents from hazardous waste
Therefore, there is a lack of devices in the prior art that can separate and recover different high-viscosity solvents from waste liquids of different sources and different compositions 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

Method used

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  • Recycling device for solvents with high freezing point and high viscosity in dangerous waste treatment field, skid-mounted structure and method thereof
  • Recycling device for solvents with high freezing point and high viscosity in dangerous waste treatment field, skid-mounted structure and method thereof
  • Recycling device for solvents with high freezing point and high viscosity in dangerous waste treatment field, skid-mounted structure and method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] The liquid hazardous waste to be treated mainly contains 80% propylene glycol methyl ether acetate, 3% light phase, 15% water and 2% impurities.

[0070] In the first step, the liquid to be treated is transported to the rectification kettle, heated and vaporized, and then enters the rectification tower for separation;

[0071] The second step is to adjust the rectification operating conditions and perform partial reflux rectification operation. The top temperature of the rectification tower is 50°C, the temperature of the bottom of the tower is 130°C, and the number of theoretical plates is 20. The gas produced at the top of the tower is collected by the condenser and Contains 17% of light phase and 83% of water after being condensed in the device, the light phase and water are stored in the waste liquid storage device, the heavy phase is extracted from the rectification column, and the heavy phase contains 97% of solvent propylene glycol methyl ether acetate, 3% of impu...

Embodiment 2

[0074] The liquid hazardous waste to be treated mainly contains 80% xylene, 4% light phase, 13% water and 3% impurities.

[0075] In the first step, the liquid to be treated is transported to the rectification kettle, heated and vaporized, and then enters the rectification tower for separation;

[0076] The second step is to adjust the rectification operating conditions and perform partial reflux rectification operation. The temperature of the top of the rectification tower is 50°C, the temperature of the bottom of the tower is 120°C, and the number of theoretical plates is 20. The gas produced at the top of the tower is collected by the condenser and Contain light phase 25% after condensation, water 75%, light phase and water are stored in the waste liquid storage device, rectification tower column extracts heavy phase, heavy phase contains solvent xylene 96%, impurity 4%, will heavy The phase is sent to the evaporator for evaporation and separation, and the concentration of ...

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Abstract

The invention provides a recycling device for solvents with high freezing point and high viscosity in dangerous waste treatment field, a skid-mounted structure and a method thereof. The recycling device comprises a rectifying tower; the tower top of the rectifying tower is directly connected with a condenser; a liquid-phase outlet of the condenser is respectively connected with an effluent collecting device, a transition distilling collecting device and a product collecting device; a rectifying tower reactor is connected with a rectifying kettle; the bottom of the rectifying tower is directlyarranged on the rectifying kettle; a falling-film evaporator is arranged on the rectifying kettle; an outlet of the rectifying kettle is respectively connected with the falling-film evaporator and anevaporator through pipelines; a circulating pump is arranged on the pipelines; the evaporator is connected with the condenser; the condenser is connected with the product collecting device. Such a setof device can be used for separating and recycling different solvents with high freezing point and high viscosity from effluents from different sources or containing different components; the materials with high freezing point and high viscosity can be effectively prevented from coagulating or adhering to the interior of the device and consequently reducing the separation efficiency and blockingthe equipment pipelines; the skid-mounted structure of the recycling device 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 high-freezing-point and high-viscosity solvent recovery device in the field of hazardous waste treatment, a skid-mounted structure and a method thereof. 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D3/14B01D3/32
CPCB01D3/148B01D3/32
Inventor 隋然王红星陆丁丁郑湘炜
Owner TIANJIN ZHONGFU ENG TECH
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