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Organic waste gas recovery method based n condensation-extraction process

A technology of organic waste gas and recovery method, which is applied in the field of waste gas recovery and organic waste gas recovery, can solve the problems of under-recycling of organic solvents, excessive moisture content of organic solvents, low temperature ice blockage by condensation method, etc., and achieves low operating cost and improved recovery. rate, and the effect of reducing losses

Inactive Publication Date: 2016-02-24
GUANGDONG CODE OF ENVIRONMENTAL PROTECTION ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to solve the problem that in the prior art, there is low-temperature ice blockage in the condensation method, and the recovered organic solvent is far from the standard for recycling, and it needs to be processed before it can be put into use.
Provide a recovery method of organic waste gas based on condensation-extraction method. On the basis of the traditional closed cycle condensation method, by adding an appropriate amount of solvent with both antifreeze and extraction capabilities to the system, high-efficiency heat exchange, cooling capacity, and residual organic waste gas can be achieved. And the triple cycle of industrial gas solves the problem of high energy consumption of the traditional condensation method and is only suitable for the recovery of high-boiling point organic waste gas; choose antifreeze with excellent extraction ability to solve low-temperature ice blockage and excessive water content of recovered organic solvents The problem

Method used

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  • Organic waste gas recovery method based n condensation-extraction process
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  • Organic waste gas recovery method based n condensation-extraction process

Examples

Experimental program
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Effect test

specific Embodiment 1

[0039] refer to figure 1, Recycling of slightly water-soluble organic waste gas Taking toluene as an example, a systematic analysis of the recovery of slightly water-soluble organic waste gas is carried out. The relevant basic data and process calculation results are shown in Table 2.

[0040] Table 2. Process calculation for treating toluene waste gas based on condensation-extraction organic waste gas recovery method

[0041]

[0042]

[0043]

[0044]

[0045] The basic principle of this embodiment is: based on the principle that the vapor pressure of the organic solvent decreases as the temperature decreases, the organic waste gas in the closed circulation system is recovered. The entire treatment process is a physical process without chemical reactions. The process flow is: first, lower the temperature to about 4°C to remove most of the water in the system; secondly, lower the temperature of the system to about minus 40°C, and add antifreeze with excellent ex...

specific Embodiment 2

[0047] Recycling of partially water-soluble organic waste gas Taking ethyl acetate as an example, the system analysis of partially water-soluble organic waste gas recovery was carried out. The relevant basic data and process calculation results are shown in Table 3.

[0048] Table 3. Process calculation for treating ethyl acetate waste gas based on condensation-extraction organic waste gas recovery method

[0049]

[0050]

[0051]

[0052] The basic principle and process of this embodiment are similar to those described in Embodiment 1. As can be seen from Table 3, the recovery rate of ethyl acetate is higher than 90%, and its purity is not less than 99%. During the whole condensation-extraction process, the loss of extractant is small. According to the operation of the equipment for 300 days, 24 hours a day, the total loss of extractant is about 400kg. The overall energy consumption of this process is about 55kW.

specific Embodiment 3

[0053] The recovery of water-soluble organic waste gas, taking DMF (DimethylFormamide, English as "DimethylFormamide") as an example to conduct a systematic analysis of the recovery of water-soluble organic waste gas. The relevant basic data and process calculation results are shown in Table 4.

[0054] Table 4. Process calculation for treating DMF waste gas based on condensation-extraction

[0055]

[0056]

[0057]

[0058]

[0059] The treatment process of water-soluble organic waste gas is different from that of specific embodiment 1 and specific embodiment 2, which are two kinds of organic waste gas with poor water solubility. The main difference is: in the low-temperature condensation stage, no antifreeze needs to be added, and the process structure is relatively simple. For the recovered organic solvent, you can directly add a good extractant at room temperature to separate and purify it. Since the added extractant does not need to have antifreeze ability, ...

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Abstract

An organic waste gas recovery method based n condensation-extraction process comprises steps of waste-gas concentration adjusting, stepped precooling, deep cooling, circulating, deicing or defrosting, extraction and extractant recovery. The method is characterized in that in the waste-gas concentration adjusting step, a manner of increasing or reducing the blast capacity is employed for adjusting the concentration of organic waste gas at a client side based on the client-side organic waste gas concentration and the waste-gas concentration safety standard prescribed by national standard, the organic waste gas concentration is guaranteed to be in the concentration scope limited by national standard and the system safety is guaranteed. The organic waste gas recovery method based n condensation-extraction process gives play to protrude recovery effect on high-, middle- and low-boiling-point organic waste gases by utilizing a relatively-closed circulation system for waste gas recovery and extractant cyclic utilization.

Description

technical field [0001] The invention relates to a method for recovering organic waste gas, in particular to a method for recovering organic waste gas based on a condensation-extraction method. It belongs to the technical field of waste gas recovery methods. Background technique [0002] At present, my country's air pollution is serious, and industrial waste gas is an important source of air pollution. The most difficult to deal with in industrial waste gas is organic waste gas. A large amount of organic waste gas discharge, on the one hand, poses a serious threat to human health, and on the other hand, it will cause a waste of resources. The discharge of organic waste gas not only pollutes the environment, but also causes huge economic losses to enterprises and the country. my country's environmental protection "Twelfth Five-Year Plan" clearly pointed out that the control of volatile organic pollutants and toxic waste gases needs to be strengthened. Strengthen the emissi...

Claims

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Application Information

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IPC IPC(8): B01D53/00B01D5/00B01D11/04
CPCB01D5/0036B01D11/04B01D53/002B01D2257/708
Inventor 汪小刚
Owner GUANGDONG CODE OF ENVIRONMENTAL PROTECTION ENG CO LTD
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