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Recovering and purifying device of organic solvent and method

An organic solvent and fan technology, which is applied in the field of organic solvent recovery and purification devices, can solve the problems affecting the quality of recovered materials, etc., and achieve the effects of being conducive to condensation separation, reducing the possibility of chemical changes, and reducing secondary pollution.

Active Publication Date: 2011-07-27
SHANGHAI TONGJI CONSTR TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of hot gas desorption is that direct use of hot air desorption may be dangerous, and the presence of oxygen will affect the quality of recycled materials

Method used

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  • Recovering and purifying device of organic solvent and method
  • Recovering and purifying device of organic solvent and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]An organic solvent recovery and purification device consists of a first heat exchanger 1, a first air cooler 2, a first adsorber 3, a second adsorber 4, a first fan 5, an oil furnace 6, a second fan 7, and an oil heater 8. Second heat exchanger 9, second air cooler 10, first condenser 11, second condenser 12, third fan 13, water cooler 14, gas cylinder 15, solvent recovery tank 16, first flame arrester 17. The second flame arrester 18, the first valve 19, the fifth valve 20, the second valve 21, the seventh valve 22, the fourth valve 23, the eighth valve 24, the fourteenth valve 25, the sixth valve 26, the Three valves 27, eleventh valves 28, twelfth valves 29, ninth valves 30, tenth valves 31, thirteenth valves 32, fifteenth valves 33, sixteenth valves 34, seventeenth valves 35, Oxygen sensor 36, nineteenth valve 37, twentieth valve 38, twenty-first valve 39, twenty-third valve 40, twenty-fourth valve 41, temperature transmitter 42, pressure transmitter 43, temperature ...

Embodiment 2

[0046] Adopting the device described in embodiment 1, taking the first adsorber 3 as an example, the method for reclaiming and purifying the organic solvent by the above-mentioned device is as follows:

[0047] Pre-cool organic solvents containing xylene and petroleum hydrocarbons to 100°C, then cool to 40°C, open the first valve 19 and the second valve 21, pass the cooled waste gas into the first adsorber 3, and put the adsorbed waste gas into the first adsorber 3. The exhaust gas is preheated to 200°C and then output; when the concentration of organic solvent is 2000ppm, the adsorption time is generally 8 hours. After the adsorption time arrives, close the first valve 19 and the second valve 21, open the third valve 27 and the fourth valve 23, open the oil heater 8 and the oil furnace 6, and open the second fan 7 after 10 minutes to preheat The gas with low oxygen content up to 300°C is passed into the first adsorber 3 for desorption; when the temperature of the adsorber exc...

Embodiment 3

[0053] Adopting the device described in embodiment 1, taking the first adsorber 3 as an example, the method for reclaiming and purifying the organic solvent by the above-mentioned device is as follows:

[0054]Pre-cool organic solvents containing xylene and petroleum hydrocarbons to 60°C, then cool to 20°C, open the first valve 19 and the second valve 21, pass the cooled waste gas into the first adsorber 3, and put the adsorbed waste gas into the first adsorber 3. The exhaust gas is preheated to 150°C and then output; when the concentration of organic solvent is 2000ppm, the adsorption time is generally 8 hours. After the adsorption time arrives, close the first valve 19 and the second valve 21, open the third valve 27 and the fourth valve 23, open the oil heater 8 and the oil furnace 6, and open the second fan 7 after 10 minutes to preheat The gas with low oxygen content up to 200°C is passed into the first adsorber 3 for desorption; when the temperature of the adsorber excee...

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Abstract

The invention provides a recovering and purifying device of an organic solvent and a method. The invention is characterized in that a first absorber and a second absorber which operate alternatively are adopted to purify waste gas and are desorbed by adopting gas with low oxygen content. The desorption of adsorbents by adopting a closed loop system with low oxygen content has the following benefits: the closed loop effectively improves partial pressure of organic gas under the condition of not having influence on heat transmission rate and is beneficial to condensation and separation; due to the closed loop, the total oxygen content of gas in the loop is controlled so as to lead the probability that organic matters in the regenerative process have chemical change to be reduced greatly; the quality of the recovered organic matters is better; and low oxygen content ensures the safety of the system. Under the premise of guaranteeing the recovering yield, the device and the method effectively improve efficiency of energy utilization in the desorption process, simultaneously the obtained organic matters have high purity, the subsequent refining cost is low, and the application range ofabsorption separation and absorption recovery of gaseous pollutants is expanded.

Description

technical field [0001] The invention relates to an organic solvent recovery and purification device and method, and belongs to the technical field of environmental protection, energy saving and emission reduction. Background technique [0002] A solvent is an inorganic or organic liquid substance capable of dissolving other gaseous, liquid or solid substances. In industrial production, more organic solvents are used. Organic solvents are all volatile organic compounds (Volatile Organic Compounds, referred to as VOCs. VOCs usually refer to organic compounds with a boiling point lower than 260°C at normal pressure or a saturated vapor pressure greater than 71Pa at room temperature. Or organic matter with a saturated vapor pressure greater than 13Pa at 25°C is called VOCs. [0003] The xylene in the gas in the drying room mainly comes from the volatilization on the surface of the painted parts, and its concentration is related to the turnover rate of the parts to be dried, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/02B01D5/00
Inventor 匡志平
Owner SHANGHAI TONGJI CONSTR TECH
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