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Membrane-method recovery process for realizing zero emission of volatile organic compound

A technology for volatile organic compounds and organic compounds, applied in separation methods, chemical instruments and methods, separation of dispersed particles, etc., can solve problems that are difficult to implement and achieve low operating costs, high purity of organic compounds, and high reuse value.

Active Publication Date: 2014-04-09
JIANGSU JIUMO HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the condensation or absorption unit in the membrane separation coupling process requires a high content of organic matter in the exhaust gas, while the content of volatile organic compounds in the exhaust gas of most enterprises is relatively low, which leads to "condensation + membrane separation" or "absorption + membrane separation" ” and other processes have only been industrialized in a few fields such as oil and gas recovery and organic monomer recovery, where the concentration of organic matter in the exhaust gas is high, while the concentration of organic matter in coating printing, spray paint, leather, rubber and electronics is low but the concentration is low. It is difficult to realize the application in the industry with a large amount

Method used

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  • Membrane-method recovery process for realizing zero emission of volatile organic compound
  • Membrane-method recovery process for realizing zero emission of volatile organic compound
  • Membrane-method recovery process for realizing zero emission of volatile organic compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A coating and printing factory in the south adopts the process of the present invention to recycle organic solvents, and its process flow chart is as follows figure 2 shown in figure 1 On the basis of the shown structure, a blower 2, a heat exchanger 10 and a cooler 11 are also provided between the organic matter generation system 1 and the membrane separation system 3, wherein the organic matter generation system 1 has an electric heater 9 as an auxiliary organic matter generation device. At the same time, a vacuum pump 4 is provided between the membrane separation system 3 and the condensation system, and the condensation system includes a precooler 5 , a condenser 6 and an organic matter collection tank 7 .

[0044] Depend on figure 2 It can be seen that the coated product volatilizes a large amount of organic matter in the oven of the organic matter generation system 1, and the gas containing the organic matter enters the heat exchanger 10 through the blower 2, a...

Embodiment 3

[0048] The waste gas emitted by a polyester production plant in a chemical fiber factory contains acetaldehyde, total hydrocarbons, ethylene glycol droplets, water vapor, etc.

[0049] Using the recovery process of zero discharge of volatile organic compounds of the present invention, its process flow chart is as follows image 3 shown in figure 1 On the basis of the shown structure, a mist trap 8 and a blower 2 are arranged between the organic matter generating system 1 and the membrane separation system 3, and a vacuum pump 4 is also arranged between the membrane separation system 3 and the condensation system, so that The condensing system includes a precooler 5, a condenser 6 and an organic collection tank 7.

[0050] Depend on image 3 It can be seen that the blower 2 draws the organic matter vapor, part of the mist and water vapor produced by the organic matter generating system 1 into the mist trap 8, removes the mist, part of the water vapor and some impurities conta...

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Abstract

The invention discloses a membrane-method recovery process for realizing the zero emission of a volatile organic compound. Waste gas which is generated by an organic compound generation system and contains the volatile organic compound directly enters a membrane separation system or is cooled and then enters the membrane separation system. A membrane can be separated by using the difference between the pressures of the upstream and downstream sides of the membrane as impelling force. Gas with high content of the volatile organic compound is obtained on the permeation side of the membrane through enrichment. Gas with low content of the volatile organic compound is obtained on the non-permeation side of the membrane. The gas with the high content of the volatile organic compound on the permeation side of the membrane enters a condensation system to directly obtain part of the organic compound. Meanwhile, uncondensed gas returns to the organic compound generation system, and the gas with the low content of the volatile organic compound on the non-permeation side of the membrane returns to the organic compound generation system. The two flows of returned gas pass through the organic compound generation system, are mixed with a part of the volatile organic compound, and re-enter the membrane separation system for next circulation. According to the process, any emitted gas is eliminated, and the zero emission is realized. The process plays an important role in recovery of an organic solvent.

Description

technical field [0001] The invention belongs to the technical field of chemical separation and environmental protection, and in particular relates to a membrane recovery process for realizing zero discharge of volatile organic compounds. Background technique [0002] With the development of modern industry, the use of volatile organic compounds (Volatile Organic Compounds, referred to as VOCs) is increasing. During the process of production, storage, transfer and use of VOCs, a large amount of organic vapors will be generated at any time. For example, the exhaust gas of the petrochemical industry includes various hydrocarbons and oil and gas substances; the exhaust gas emission of the washing industry mainly involves a large amount of hydrocarbon solvents (benzene, toluene, etc.), chlorinated hydrocarbons and HCFC solvents (dichloro Methane, trichlorethylene, chloroform, etc.) and solvents such as alcohols, esters, and ketones; industries such as coating printing, automotive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/22B01D53/00
Inventor 丁晓斌赵祥强南江普
Owner JIANGSU JIUMO HIGH TECH CO LTD
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