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Recovery processing method and system of volatile organic compounds according to double-membrane method

A recovery and treatment technology for volatile organic compounds, applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of redundant vacuum pumps, slow pressure release of oil storage tanks, low absorption efficiency, etc.

Active Publication Date: 2016-07-20
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the oil and gas recovery device based on the glassy membrane separation-absorption process (application number: 201410342676.9) uses the glassy membrane integrated absorption technology that preferentially permeates nitrogen to recover oil and gas; the two-stage membrane method oil and gas recovery device and its recovery method (application number: 201510278802.3) Utilize two-stage treatment of rubber state membrane and glass state membrane to achieve the purpose of VOCs purification, emission and recovery. The disadvantage is that the glass state membrane uses the molecular size to separate VOCs from nitrogen, not the size of the partial pressure difference. Therefore, the downstream side is installed The vacuum pump is redundant; at the same time, the concentrated exhaust gas from the remaining side of the glassy membrane enters the oil storage tank, which will cause slow pressure relief of the oil storage tank; the recovery is carried out in the form of an absorption tower, the absorption efficiency is low, and the exhaust gas from the absorption tower is still There are substandard problems

Method used

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  • Recovery processing method and system of volatile organic compounds according to double-membrane method
  • Recovery processing method and system of volatile organic compounds according to double-membrane method
  • Recovery processing method and system of volatile organic compounds according to double-membrane method

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Experimental program
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Effect test

Embodiment 1

[0089] The preferential nitrogen permeable membrane separation membrane is synthesized by using 2,3,6,7-tetrahydroxytripterene and 1,7-pimeloyl chloride as the main monomers, pyridine as the acid-binding agent, and methylpyrrolidone as the solvent. , the specific steps are as follows: add 1.5mol of 2,3,6,7-tetrahydroxytripene, 3mol of pyridine, and 4.5mol of 1,7-pimeloyl chloride into the methylpyrrolidone solution and stir to dissolve. Under the condition of 2°C (nitrogen protection), react for 3.5h, and coat the reacted homogeneous polycondensation mixture on the polytetrafluoroethylene base film to prepare a composite film, put the coated composite film in a vacuum oven and dry it at 70°C , that is, a tripteryl VOCs interception type polymer separation membrane is obtained. The average pore diameter of the tripterene-based VOCs interception polymer separation membrane obtained by BET test is 2.0 nm.

[0090] The test conditions are: at 25°C, nitrogen / cyclohexane is used as...

Embodiment 2

[0094] The preferential nitrogen permeable membrane separation membrane is synthesized by using 2,3,6,7,14,15-hexaaminotriptycene and suberoyl chloride as the main monomers, pyridine as the acid-binding agent, and methylpyrrolidone as the solvent. The specific steps are as follows: 1mol of 2,3,6,7,14,15-hexaaminotriptycene, 3.5mol of pyridine, and 3mol of suberoyl chloride are added to the methylpyrrolidone solution and stirred to dissolve, and the temperature is Under the condition of 2°C (nitrogen protection), react for 3.5h, the homogeneous polycondensation mixed solution of the reaction is coated on the polytetrafluoroethylene base film to prepare a composite film, and the coated composite film is dried in a vacuum oven at 70°C. That is, a tripteryl VOCs interception type polymer separation membrane is obtained. The average pore size of the tripterene-based VOCs interception polymer separation membrane prepared by BET test was 1.6nm.

[0095] The test conditions are: at 2...

Embodiment 3

[0099] The preferential nitrogen permeable membrane separation membrane is made of 9,10-diethyl-2,3,6,7,12,13-hexahydroxytriptycene and suberoyl chloride as the main monomers, and pyridine as the acid-binding agent. Methylpyrrolidone is used as a solvent for the synthesis reaction, and the specific steps are as follows: 1mol of 9,10-diethyl-2,3,6,7,12,13-hexahydroxytriptycene, 3.5mol of pyridine, 3mol of Suberoyl chloride was added into the methylpyrrolidone solution and stirred to dissolve, and reacted for 3.5 hours at a temperature of 2°C (nitrogen protection), and the homogeneous polycondensation mixture was coated on the polytetrafluoroethylene base film to prepare a composite film. The coated composite membrane was dried in a vacuum oven at 70° C. to obtain a tripterene-based VOCs interception polymer separation membrane. The average pore size of the tripterene-based VOCs interception polymer separation membrane prepared by BET test was 1.3nm.

[0100] The test condition...

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Abstract

The invention discloses a recovery method and system of volatile organic compounds according to a double-membrane method. According to the recovery method, two kinds of separation membranes namely a VOCs separation membrane and a nitrogen separation membrane are used for realizing double purposes of recovering VOCs and performing treatment for reaching a set standard. The recovery method is high in VOCs treatment efficiency, mild in operating condition and low in energy consumption; besides, the nitrogen pmselective separation membrane is applied, so that the problem that VOCs are leaked due to an equipment failure can be solved, the degree of safety is high, and the recovery method and system can be widely applied to the fields of treating petroleum chemical process exhaust gas, storage tank respiration valve exhaust gas and the like in an organized VOCs discharge process.

Description

technical field [0001] The invention belongs to the technical field of treating VOCs by a membrane method, and in particular relates to a double-membrane method and a system for recovering and treating volatile organic compounds. Background technique [0002] Volatile organic compounds (VOCs) are highly volatile, so volatilization of VOCs is inevitable during use, resulting in a large amount of volatilization and waste of VOCs. The emission of VOCs will not only cause a great waste of resources and economic losses; it is also an important prerequisite for the formation of PM2.5 and ozone, which is harmful to human health. For this reason, the country has formulated a number of mandatory regulations with legal effect to strictly control VOCs emissions, such as the Action Plan for Air Pollution Prevention and Control. At the same time, in 2015, many provinces and cities began to implement the "Pilot Measures for Volatile Organic Compounds Pollutant Discharge Charges", and int...

Claims

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Application Information

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IPC IPC(8): B01D53/22B01D53/00
CPCB01D53/002B01D53/22B01D2257/708Y02A50/20
Inventor 周浩力吕磊金万勤
Owner NANJING UNIV OF TECH
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