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Method and device for recovering organic solvent from waste gases of printing industry

An organic solvent, adsorption recovery technology, applied in the field of environmental protection, can solve the problems of high energy consumption of electric heating, difficulty in direct discharge, high operating costs, etc., and achieve the effect of high recovery efficiency, convenient operation, and compensation of operating costs

Inactive Publication Date: 2008-09-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inert gas heating will lead to higher operating costs, while electric heating consumes high energy, so it is not used industrially
Steam heating is widely used at present. After the separation treatment in the oil-water separator, the water phase generally contains a small amount of organic solvents, which will change the color and taste of the water and make it difficult to discharge directly.

Method used

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  • Method and device for recovering organic solvent from waste gases of printing industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]Purify and recycle the organic waste gas emitted by the printing factory. The main components of the waste gas are toluene, acetone, and isopropanol. The mass ratio between the three is 5:2:1. The exhaust volume of the plant is 10000m3 / h, and the concentration of the organic waste gas is 1000ppm, the organic waste gas from the printing workshop passes through the filter to remove the dust and particle impurities under the action of the fan, and enters the cooler through the flame arrester to cool down. The temperature reaches 35°C, and the cooled waste gas is passed into one of the adsorbers Adsorption, when the outlet concentration of the adsorbate reaches 30ppm, the adsorber stops adsorption, and the waste gas is transferred to the second adsorber for adsorption; the adsorption is near the saturated adsorber, which uses water vapor heating for desorption and desorption, and the mass ratio of water vapor to solvent is 3:1, the desorbed mixed vapor is condensed by one of ...

Embodiment 2

[0026] Purify and recycle the organic waste gas emitted by the printing factory. The main components of the waste gas are toluene, acetone, and isopropanol. The mass ratio between the three is 6:3:2. The exhaust volume of the plant is 10000m3 / h, and the concentration of the organic waste gas is 1000ppm, the organic waste gas from the printing workshop passes through the filter to remove the dust and particle impurities under the action of the fan, and enters the cooler through the flame arrester to cool down. The temperature reaches 30°C, and the cooled waste gas is passed into one of the adsorbers Adsorption, when the outlet concentration of the adsorbate reaches 32ppm, the adsorber stops adsorption, and the exhaust gas is transferred to the second adsorber for adsorption; the adsorption is near the saturated adsorber, which uses water vapor heating for desorption and desorption, and the mass ratio of water vapor to solvent is 5:1, the desorbed mixed vapor is condensed by one ...

Embodiment 3

[0028] Purify and recycle the organic waste gas emitted by the printing factory. The main components of the waste gas are toluene, acetone, and isopropanol. The mass ratio between the three is 5:2:1. The exhaust volume of the plant is 10000m3 / h, and the concentration of the organic waste gas is 1000ppm, the organic waste gas from the printing workshop passes through the filter to remove the dust and particle impurities under the action of the fan, and enters the cooler through the flame arrester to cool down. The temperature reaches 38°C, and the cooled waste gas is passed into one of the adsorbers Adsorption, when the outlet concentration of the adsorbate reaches 28ppm, this adsorber stops adsorption, and the waste gas is transferred to the second adsorber for adsorption; the adsorption is near the saturated adsorber, which uses water vapor heating for desorption and desorption, and the mass ratio of water vapor to solvent is 4:1, the desorbed mixed vapor is condensed by one o...

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Abstract

The invention relates to a method for adsorbing and recycling organic solvent from exhaust gas in printing industry and a device. An adsorber 1 and an adsorber 2 of the device are respectively connected with a cooler by a valve and a pipeline, which lead the exhaust gas in printing industry to enter the adsorbers; the adsorber 1 and the adsorber 2 are also respectively connected with a condenser 1 by the valve and the pipeline; the condenser 1 is connected with a decanter 1 which is connected with a storage vat 1; the storage vat 1 is respectively connected with an adsorber 3 and an extraction column by the valve and the pipeline; the extraction column is also respectively connected with the adsorber 3 and the decanter 1. The method consists of an adsorption process, a desorption process, a separation process and a water treatment process. The exhaust organic gas containing toluene, acetone and isopropyl alcohol can be adsorbed by an activated carbon adsorber; after the activated carbon adsorption is saturated, steam is assisted to carry out the desorption process, while the mixed liquid desorbed is carried out to separate oil from water in the decanter. The method and device has the advantages of simple process, convenient operation, low price, high efficiency of purification and recovery and so on.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for purifying and recovering organic solvents from waste gas in the printing industry, which can be used in the occasions of gas purification, organic solvent recovery and waste water treatment. Background technique [0002] Organic solvents are one of the essential components of inks in the printing industry, and there are many types such as toluene, acetone, isopropanol, etc., which have low boiling points and are easily volatilized into the air during the production process to form organic waste gas, not only It is harmful to the health of workers, and the mixture of organic solvents and air is prone to explosion, endangering production safety and life and property. Therefore, with people's emphasis on environmental protection and the rising trend of resource prices, air purification and organic solvent recovery have become a top priority....

Claims

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Application Information

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IPC IPC(8): B01D53/04
Inventor 张会平
Owner SOUTH CHINA UNIV OF TECH
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