Method for the synergistic condensation capture of volatile organic compounds

Abstract

The present application relates to harmful gas treatment technical field, provide a kind of volatile organic matter synergic condensation trapping method.The volatile organic alcohol solution (the volatile organic alcohol solution is volatile organic alcohol or is volatile organic alcohol and the mixed solution of water) is atomized to form microdroplet;The microdroplet is contacted with the gas containing VOC, and forms gas-liquid two-phase dispersion system in airflow, VOC is entered microdroplet by gas-liquid mass transfer, and forms rich VOC microdroplet;Rich VOC microdroplet enters the condensation unit below dew point temperature and is condensed, and the condensate of rich VOC is obtained.The present application constructs the condensable microdroplet as VOC mass transfer carrier, and the single gas-liquid phase change process in traditional condensation process is extended to "gas phase absorption-droplet migration-synergic condensation deposition" multi-path synergic mass transfer process, improves the VOC migration and retention capacity to liquid phase, significantly improves the condensation trapping efficiency of VOC.

Description

Technical Field

[0001] This invention relates to the field of hazardous gas treatment technology, and in particular to a method for the synergistic condensation and capture of volatile organic compounds. Background Technology

[0002] Volatile organic compounds (VOCs) are significant atmospheric pollutants with wide-ranging sources and complex chemical compositions, making them crucial for environmental monitoring and pollution control. Based on their treatment principles, existing VOCs treatment technologies can be broadly categorized into two types: destructive technologies and recovery technologies. Destructive technologies include methods such as biodegradation, incineration, photocatalytic oxidation, and catalytic oxidation. These technologies can ultimately convert VOCs into CO2, H2O, and non-toxic or low-toxic substances, but may increase CO2 emissions during the process, thus negatively impacting the greenhouse effect. In contrast, recovery technologies align better with the circular economy concept, achieving resource utilization through the enrichment and recovery of VOCs, and typically possess higher economic value. Common VOCs recovery technologies include condensation, absorption, and membrane separation.

[0003] Condensation recovery technology is a separation method based on gas-liquid phase change. Its basic principle is to control temperature or pressure conditions to saturate VOCs in the gas and induce condensation, thereby achieving their transfer and separation from the gas phase to the liquid phase. When the partial pressure of VOCs in the gas phase is higher than their saturated vapor pressure at the corresponding temperature, the system will undergo a condensation process. This process is usually achieved by lowering the system temperature or increasing the system pressure, with cooling being more commonly used in practical engineering. In engineering applications, condensation technology mainly utilizes the differences in saturated vapor pressure and boiling point between different VOCs to cause each component to undergo phase change sequentially under different conditions, thus achieving selective separation and recovery. This method has advantages such as relatively simple process, high processing efficiency, and the ability to recover resources.

[0004] A typical condensation system usually consists of a condenser, a refrigeration unit, a gas-liquid separation unit, and storage and conveying equipment. After the gas enters the system, it is first cooled to convert some easily condensable components into the liquid phase. Then, the temperature is further reduced in the condenser to achieve effective separation of the target VOCs. The condensed liquid is collected by the gas-liquid separation device, while any remaining gaseous components can enter subsequent processing units for further purification.

[0005] However, traditional condensation methods are essentially temperature-driven, single-path gas-liquid separation processes. Their capture efficiency mainly depends on the mass transfer rate of VOCs migrating from the gas phase to the condensation interface and their retention capacity in the liquid phase. Under practical engineering conditions, due to limitations such as high exhaust gas velocity, limited gas-liquid contact time, and limited condensation interface area, highly volatile VOCs often fail to complete gas-liquid mass transfer in a timely manner and stably enter the condensate, resulting in some components being discharged with the exhaust gas, thus reducing the overall recovery efficiency. This is especially true for highly volatile and hydrophobic VOCs such as benzene, toluene, ethylbenzene, xylene, halogenated aromatic hydrocarbons, and long-chain alkanes. Because their efficiency in traditional condensation processes is low, and some components that have entered the liquid phase may still volatilize again, existing condensation technologies struggle to achieve both high capture efficiency and high recovery efficiency, which is particularly evident in complex multi-component systems.

[0006] In recent years, to improve VOCs capture efficiency, studies have attempted to enhance recovery performance through methods such as spray absorption, adsorption material enhancement, or multi-stage condensation. However, these methods mainly rely on increasing equipment scale, extending residence time, or increasing energy consumption to achieve enhanced capture, without optimizing the traditional condensation process from the perspective of VOCs gas-liquid mass transfer pathways and liquid-phase enrichment mechanisms. Therefore, developing a condensation enrichment method that can construct new VOCs mass transfer pathways, enhance gas-liquid mass transfer processes, and improve liquid-phase enrichment capabilities is of great significance for improving the capture efficiency of highly volatile VOCs and expanding the recovery capacity of VOCs in complex systems. Summary of the Invention

[0007] In view of this, the purpose of this invention is to provide a method for the synergistic condensation and capture of volatile organic compounds (VOCs). The method provided by this invention achieves efficient enrichment and capture of VOCs through multi-path synergistic mass transfer.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solution: This invention provides a method for the synergistic condensation and capture of volatile organic compounds, comprising the following steps: A volatile organic alcohol solution is atomized to form microdroplets; the volatile organic alcohol solution is a volatile organic alcohol or a mixture of volatile organic alcohol and water; The microdroplets are brought into contact with a gas containing volatile organic compounds to form a gas-liquid two-phase dispersion system in the gas flow. The volatile organic compounds enter the microdroplets through gas-liquid mass transfer, forming microdroplets rich in volatile organic compounds. The microdroplets rich in volatile organic compounds enter a condensation unit at a temperature below the dew point for condensation, resulting in a condensate rich in volatile organic compounds.

[0009] Preferably, the volatile organic alcohol includes one or more of methanol, ethanol, n-propanol and n-butanol.

[0010] Preferably, the volume fraction of volatile organic alcohol in the volatile organic alcohol solution is 20-100%.

[0011] Preferably, when the volatile organic compounds are mainly hydrophobic volatile organic compounds, the volume fraction of volatile organic alcohols in the volatile organic alcohol solution is ≥80%.

[0012] Preferably, the hydrophobic volatile organic compound includes one or more of benzene compounds, halogenated aromatic hydrocarbons, and alkanes.

[0013] Preferably, when the volatile organic compounds are mainly polar volatile organic compounds, the volume fraction of volatile organic alcohols in the volatile organic alcohol solution is 30-60%.

[0014] Preferably, the polar volatile organic compounds include alcohols and / or amines.

[0015] Preferably, the average particle size of the microdroplets is 1~100μm.

[0016] Preferably, the atomization is pneumatic atomization, ultrasonic atomization, pressure atomization, or two-fluid atomization.

[0017] Preferably, the volume percentage of volatile organic compounds in the gas containing volatile organic compounds is 10-100%.

[0018] This invention provides a method for the synergistic condensation and capture of volatile organic compounds (VOCs). Compared with the prior art, this invention has the following advantages: This invention is the first to construct a VOCs synergistic condensation enrichment mechanism using microdroplets containing volatile organic alcohols as mass transfer carriers. It expands the traditional single-path gas-liquid separation process that relies on direct VOCs condensation into a multi-path mass transfer process of "gas phase absorption - droplet migration - synergistic condensation deposition", which significantly improves the efficiency of VOCs migration to the liquid phase. Volatile organic alcohols in microdroplets can regulate the microenvironment of droplets, improve the compatibility of droplets with VOCs of different polarities, reduce the surface tension of droplets, increase the specific surface area, thereby enhancing the gas-liquid interface mass transfer process and improving the liquid phase enrichment capacity. VOCs-rich microdroplets serve as VOCs migration carriers, allowing VOCs to be deposited simultaneously with the condensate during the condensation process. This enables VOCs already in the droplets to quickly enter the condensate, effectively reducing losses caused by re-evaporation and improving condensation recovery efficiency. This invention can effectively improve the capture capacity of highly volatile VOCs, especially hydrophobic VOCs such as benzene series compounds, halogenated aromatic hydrocarbons and long-chain alkanes, without significantly reducing the condensation temperature or increasing the system pressure. In complex multi-component systems, it can significantly improve the types of recoverable VOCs and the overall enrichment efficiency. The present invention has a simple process, is easy to integrate with existing condensation equipment, and is suitable for various application scenarios such as industrial waste gas treatment, ambient air sampling, complex flue gas enrichment and VOCs online monitoring, and has good engineering application prospects.

[0019] The results of the examples show that the method of the present invention significantly improves the capture capacity of hydrophobic VOCs such as benzene series compounds and long-chain alkanes by condensation capture, and its signal response can be improved by two to three orders of magnitude compared with the traditional condensation system. At the same time, in complex environmental systems (such as tobacco smoke), it can significantly expand the types of compounds that can be captured, increasing the number of captured VOCs from 189 in the traditional condensation method to 511, indicating that the method of the present invention has stronger applicability and coverage in multi-component complex systems. Attached Figure Description

[0020] Figure 1 The effect of different volatile organic alcohols on the condensation and enrichment capacity of VOCs; Figure 2 The effect of microdroplet composition on the condensation and enrichment effect of different types of VOCs (toluene, chlorobenzene, aniline, decane) is investigated. Figure 2 In the given text, a) corresponds to toluene, b) to chlorobenzene, c) to decane, and d) to aniline; Figure 3 To compare the VOCs condensation and capture effects under different microdroplet mass transfer media, the results are as follows: a) Detection results of untreated tobacco smoke environment gas; b) Detection results of condensate obtained by microdroplet condensation and capture using pure water; c) Detection results of condensate obtained by microdroplet condensation and capture using 100% ethanol (volume fraction); d) Detection results of exhaust gas after microdroplet condensation and capture using 100% ethanol (volume fraction). Figure 4 To analyze the differences in VOCs composition in condensate under different microdroplet mass transfer media conditions, the following were analyzed: a) the chemical distribution of VOCs in condensate when ethanol microdroplets were used as the mass transfer medium; b) the relative composition of various VOCs when ethanol microdroplets were used as the mass transfer medium; c) the chemical distribution of VOCs in condensate when pure water microdroplets were used as the mass transfer medium; and d) the overlap analysis of VOCs composition in condensate under two mass transfer media conditions. Detailed Implementation

[0021] This invention provides a method for the synergistic condensation and capture of volatile organic compounds, comprising the following steps: A volatile organic alcohol solution is atomized to form microdroplets; the volatile organic alcohol solution is a volatile organic alcohol or a mixture of volatile organic alcohol and water; The microdroplets are brought into contact with a gas containing volatile organic compounds to form a gas-liquid two-phase dispersion system in the gas flow. The volatile organic compounds enter the microdroplets through gas-liquid mass transfer, forming microdroplets rich in volatile organic compounds. The microdroplets rich in volatile organic compounds enter a condensation unit at a temperature below the dew point for condensation, resulting in a condensate rich in volatile organic compounds.

[0022] This invention atomizes a volatile organic alcohol solution into microdroplets.

[0023] In this invention, the volatile organic alcohol solution is a volatile organic alcohol or a mixture of volatile organic alcohol and water; the volatile organic alcohol preferably includes one or more of methanol, ethanol, n-propanol and n-butanol; the volume fraction of volatile organic alcohol in the volatile organic alcohol solution is preferably 20-100%.

[0024] In a preferred embodiment, when the VOCs to be treated are mainly hydrophobic volatile organic compounds (such as benzene compounds, halogenated aromatic hydrocarbons, and long-chain alkanes) (i.e., the proportion of hydrophobic volatile organic compounds in the VOCs is the highest), the volume fraction of volatile organic alcohols in the volatile organic alcohol solution is preferably ≥80%. That is, when the VOCs to be treated are mainly hydrophobic organic compounds, increasing the proportion of volatile organic alcohols can improve the liquid phase's enrichment capacity for hydrophobic VOCs.

[0025] In another preferred embodiment, when the VOCs to be treated are mainly polar volatile organic compounds (such as alcohols and amines) (i.e., the proportion of polar volatile organic compounds in the VOCs is the highest), the volume fraction of volatile organic alcohols in the volatile organic alcohol solution is preferably 30-60%, which can be 30%, 40%, 50%, or 60%. When the VOCs to be treated are mainly polar organic compounds, appropriately reducing the proportion of volatile organic alcohols can balance the mass transfer efficiency and droplet stability of polar VOCs. That is, for polar VOCs, a medium alcohol volume fraction (30-60%) range shows better results.

[0026] In this invention, the atomization method is preferably pneumatic atomization, ultrasonic atomization, pressure atomization, or two-fluid atomization. In this invention, the average particle size of the microdroplets is preferably 1~100 μm (the microdroplets are also called micron-sized droplet aerosols), and can be 50~80 μm. In this invention, the microdroplets formed by atomizing the mixture of volatile organic alcohol and water are called composite microdroplets.

[0027] In this invention, the volatile organic alcohol can form a stable composite microdroplet system with water, and by adjusting the droplet polarity, interfacial properties, and VOCs distribution behavior in the droplets, the absorption and enrichment capacity of the composite microdroplets for different types of VOCs can be improved. At the same time, the introduction of volatile organic alcohol can also reduce the surface tension of the droplets, reduce the droplet size, and increase the gas-liquid contact area, thereby strengthening the gas-liquid interface mass transfer process and improving the efficiency of VOCs migration to the liquid phase.

[0028] After forming microdroplets, the present invention contacts the microdroplets with a gas containing volatile organic compounds to form a gas-liquid two-phase dispersion system in the gas flow. The volatile organic compounds enter the microdroplets through gas-liquid mass transfer to form volatile organic compound-rich microdroplets (VOC-rich microdroplets).

[0029] This invention does not impose any special restrictions on the source and composition of the VOCs-containing gases. Any VOCs known to those skilled in the art can be enriched and captured using the method of this invention. The VOCs include, but are not limited to, one or more of the following: benzene, toluene, ethylbenzene, xylene, styrene, chlorobenzene, bromobenzene, hexane, heptane, octane, decane, and alcohols, ketones, aldehydes, and amines (such as aniline).

[0030] In this invention, the volume percentage of volatile organic compounds in the gas containing volatile organic compounds is preferably 10-100%.

[0031] This invention first utilizes the atomization of volatile organic alcohols or a mixture of volatile organic alcohols and water to generate microdroplets. These microdroplets are uniformly dispersed in a gas stream, forming a gas-liquid two-phase dispersion system with the VOCs-containing gas. In this system, VOCs in the gas phase can be mass-transferred into the microdroplets through the gas-liquid interface and enriched within the droplets, thus forming VOCs-rich microdroplets. In this invention, these microdroplets serve both as an absorption medium for VOCs and as a mass transfer carrier for VOCs migration to the condensate, providing a new mass transfer pathway for the subsequent condensation and enrichment process.

[0032] After obtaining VOCs-rich microdroplets, the VOCs-rich microdroplets enter a condensation unit with a temperature below the dew point for condensation. The VOCs-rich microdroplets and the condensate are deposited together to obtain a VOCs-enriched condensate.

[0033] In this invention, the operating temperature of the condensation unit is lower than the dew point temperature of the gas to be treated, to ensure stable condensation. During the condensation process, VOC-rich microdroplets deposit at the condensation interface and fuse with the condensate. The VOCs enriched in the droplets simultaneously enter the condensate, thereby achieving efficient migration and enrichment of VOCs from the gas phase to the liquid phase.

[0034] This invention provides a synergistic condensation and capture method for volatile organic compounds (VOCs) based on the regulation of volatile organic alcohols. By introducing droplet absorption and droplet deposition pathways, the traditional single gas-liquid distribution process is extended into a multi-path synergistic mass transfer process, improving the migration and retention capacity of VOCs into the liquid phase. In particular, it significantly improves the condensation and capture efficiency of highly volatile and hydrophobic VOCs such as benzene series compounds and alkanes. At the same time, it expands the types of VOCs captured in complex systems. It has the advantages of simple process, low energy consumption, wide applicability, and high resource recovery efficiency.

[0035] The synergistic condensation capture method based on volatile organic alcohol regulation proposed in this invention not only effectively improves the capture efficiency of traditional condensation systems for hydrophobic volatile organic compounds, but also has broad application prospects in practical applications. This method can be applied to the continuous removal and enrichment recovery of low-concentration VOCs in indoor air environments, such as the control and analysis of volatile organic pollutants in newly renovated environments, furniture material releases, and tobacco smoke. Simultaneously, in industrial production environments, for medium- to high-concentration VOCs waste gases generated during processes such as spraying, printing, and petrochemical processing, this method can serve as an efficient pretreatment or recovery method. By regulating the droplet system, it achieves the enrichment and recovery of volatile organic gases, thereby reducing emissions and improving resource utilization efficiency. Furthermore, in enclosed or semi-enclosed spaces, such as storage and transportation tanks, underground facilities, and special operating spaces, once toxic and harmful volatile organic gases accumulate, the gas-liquid multiphase synergistic capture technology provided by this invention can rapidly reduce the concentration of gaseous pollutants and transfer them to the liquid phase, helping to improve air quality and reduce exposure risks. Therefore, the method of the present invention has good application potential and promotion value in multiple fields such as environmental monitoring, pollution control and emergency protection.

[0036] To further illustrate the present invention, the following detailed description of the synergistic condensation and capture method for volatile organic compounds provided by the present invention is provided in conjunction with examples, but these should not be construed as limiting the scope of protection of the present invention.

[0037] Example 1 An experimental system was constructed in a 40 L sealed glass reaction chamber. 10 μL of a liquid VOCs standard solution (a mixture of toluene, chlorobenzene, aniline, and decane, with a volume ratio of 1:1:1:1) was placed in a glass dish and placed in the reaction chamber. The solution was allowed to stand for 10 min to allow the target compounds to fully volatilize and form a stable gaseous environment. Methanol, ethanol, n-propanol, and n-butanol were atomized into microdroplets (average particle size 80 μm) using a nebulizer and introduced into the sealed reaction chamber. Simultaneously, a condenser (located inside the sealed reaction chamber, below the dew point temperature) was activated and run continuously for 30 min to ensure sufficient contact between the microdroplets and the gaseous VOCs, resulting in synergistic condensation and enrichment. The condensate sample was collected after the experiment. The condensate was placed in a headspace vial, and an equal volume of chloroform was added for liquid-liquid extraction. After vortexing for 10 min and standing for 30 min, phase separation was achieved. The organic phase was then analyzed by gas chromatography-mass spectrometry. Experiments were conducted under the same conditions using microdroplets formed from pure water as a comparison. The results are as follows: Figure 1 As shown.

[0038] Compared with the pure water microdroplet condition, the signal response of the target compound was significantly improved under the four lower alcohol microdroplet conditions, indicating that the introduction of volatile organic alcohols can promote the migration of VOCs into microdroplets and improve the condensation and enrichment efficiency. Further comparison of the effects of different alcohols shows that the response enhancement of the target compound is more significant under methanol and ethanol conditions, while the promoting effect gradually weakens as the carbon chain length of the alcohol increases.

[0039] The above results indicate that by constructing a microdroplet system, the liquid phase enrichment capacity of VOCs can be effectively improved, and the VOCs capture effect of the condensation system can be enhanced.

[0040] Example 2 Referring to the method in Example 1, the effect of the composition of the composite microdroplets on the VOCs condensation and enrichment effect was investigated by adjusting the volume fraction of ethanol in the ethanol-water composite solution to 0%, 20%, 50%, 80%, and 100%. The results are as follows: Figure 2 As shown.

[0041] With increasing ethanol volume fraction, the signal responses of most VOCs significantly increased. For aromatic hydrocarbons such as toluene and chlorobenzene, the response changes were relatively small within the ethanol volume fraction range of 0%–50%; however, the signal intensity increased significantly when the ethanol volume fraction exceeded 80%. At a 100% ethanol volume fraction, the signal intensities of toluene and chlorobenzene increased by more than 100 times compared to pure water. For decane, which is more hydrophobic, the signal enhancement was even more significant, reaching a maximum increase of approximately 1000 times. For polar compounds such as aniline, the signal response reached its maximum at an ethanol volume fraction of approximately 50%, subsequently decreasing as the ethanol proportion continued to increase.

[0042] The above results indicate that the condensation and enrichment capabilities of VOCs of different polarities can be controlled by adjusting the composition of volatile organic alcohols in the composite microdroplets. A higher ethanol ratio is beneficial for improving the enrichment efficiency of hydrophobic VOCs, while a moderate ethanol ratio is more conducive to the capture of polar VOCs.

[0043] Example 3 For complex sample validation, the VOCs sample in Example 1 was replaced with tobacco smoke, using cigarette smoke as the source of complex VOCs. Environmental tobacco smoke is a significant source of indoor air pollution, releasing a large amount of complex and diverse VOCs during combustion, including hydrocarbons, nitrogen-containing heterocyclic compounds, oxygen-containing organic compounds, and phenols. This example uses tobacco smoke as a representative complex environmental system to validate the practical application capability of the constructed synergistic condensation and capture method for volatile organic alcohols.

[0044] Cigarettes were placed in a 40L sealed glass reaction chamber for complete combustion, allowing the smoke to disperse uniformly and form a stable, complex VOCs environment. Subsequently, synergistic condensation enrichment was achieved using pure water microdroplets and ethanol-water composite microdroplets, with the atomization and condensation system running continuously for 30 minutes. After condensation, the condensate sample was collected and analyzed by liquid-liquid extraction and gas chromatography-mass spectrometry according to the method in Example 1. Simultaneously, the untreated tobacco smoke environment gas, pure water microdroplet condensate, ethanol composite microdroplet condensate, and the exhaust gas after ethanol composite microdroplet treatment were analyzed. The results are as follows: Figure 3 As shown.

[0045] Figure 3 Chromatograms of VOCs under different sampling conditions. Figure 3 a) Detection results of untreated tobacco smoke ambient gases; b) Detection results of condensate obtained by condensation and trapping with pure water microdroplets; c) Detection results of condensate obtained by condensation and trapping with 100% ethanol microdroplets; d) Detection results of exhaust gas after condensation and trapping with 100% ethanol microdroplets. The results show that compared with untreated tobacco smoke ambient gases, the exhaust gas treated with ethanol microdroplets and synergistic condensation has significantly reduced the number of characteristic peaks and significantly lowered the overall spectral background, indicating that the method of this invention can effectively reduce the concentration of gaseous VOCs and achieve the transfer and enrichment of VOCs into the condensate.

[0046] Further analysis of the condensate obtained under ethanol microdroplet conditions identified 511 VOCs, which were classified into 18 categories based on their chemical structure. Their compositional characteristics are as follows: Figure 4 As shown. Figure 4 To classify and analyze the structural differences and compositional variations of VOCs in condensate samples under different treatment conditions, Figure 4a) Chemical distribution of VOCs in the condensate when ethanol microdroplets are used as the mass transfer medium; b) Relative composition of various VOCs when ethanol microdroplets are used as the mass transfer medium; c) Chemical distribution of VOCs in the condensate when pure water microdroplets are used as the mass transfer medium; d) Overlap analysis of VOC composition in the condensate under two mass transfer medium conditions. The results show that hydrocarbons, alcohols, pyridines, nitrogen-containing compounds, ketones, sulfur-containing compounds, ethers, and aldehydes account for the majority, with 118 (23.09%), 86 (16.83%), 53 (10.37%), 47 (9.20%), 45 (8.81%), 30 (5.87%), 25 (4.89%), and 24 (4.70%) compounds, respectively. Other compounds such as esters, furans, phenols, and various nitrogen-containing heterocyclic compounds have relatively low proportions. Figure 4 Compounds a) and b) accounted for approximately 16.23% in total. In contrast, only 189 compounds were detected and identified under pure water atomization conditions. Figure 4 In the case of ethanol composite microdroplets (c), the main compounds were hydrocarbons, pyridines, nitrogen-containing compounds, and carbonyl compounds. A total of 95 compounds were detected under both conditions, indicating that the ethanol composite microdroplets significantly expanded the range of VOCs that could be enriched in complex systems while retaining the components that could be captured in pure water. Further comparison of the compound composition characteristics under different conditions shows that the types and abundance of VOCs detected under the synergistic condensation condition of ethanol composite microdroplets were significantly increased, especially showing a higher response level to hydrophobic and weakly polar compounds.

[0047] The above results indicate that the composite microdroplet synergistic condensation enrichment method provided by the present invention can significantly improve the overall capture capacity and coverage of VOCs in complex environmental systems, and exhibits better enrichment effects for highly volatile, hydrophobic and weakly polar VOCs, showing good potential for environmental applications.

[0048] As can be seen from the above embodiments, the present invention adopts a volatile organic alcohol atomization strategy, based on droplet microenvironment regulation, and from the perspective of gas-liquid multiphase regulation, can significantly enhance the synergistic capture and recovery capability of the condensation system for VOCs in complex environments, providing a simple and effective method for the efficient capture and analysis of multi-component organic pollutants in indoor air.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for the synergistic condensation and capture of volatile organic compounds, characterized in that, Includes the following steps: A volatile organic alcohol solution is atomized to form microdroplets; the volatile organic alcohol solution is a volatile organic alcohol or a mixture of volatile organic alcohol and water; The microdroplets are brought into contact with a gas containing volatile organic compounds to form a gas-liquid two-phase dispersion system in the gas flow. The volatile organic compounds enter the microdroplets through gas-liquid mass transfer, forming microdroplets rich in volatile organic compounds. The microdroplets rich in volatile organic compounds enter a condensation unit at a temperature below the dew point for condensation, resulting in a condensate rich in volatile organic compounds.

2. The method for synergistic condensation and capture of volatile organic compounds according to claim 1, characterized in that, The volatile organic alcohols include one or more of methanol, ethanol, n-propanol, and n-butanol.

3. The method for synergistic condensation and capture of volatile organic compounds according to claim 1 or 2, characterized in that, The volume fraction of volatile organic alcohols in the volatile organic alcohol solution is 20-100%.

4. The method for synergistic condensation and capture of volatile organic compounds according to claim 3, characterized in that, When the volatile organic compounds are mainly hydrophobic volatile organic compounds, the volume fraction of volatile organic alcohols in the volatile organic alcohol solution is ≥80%.

5. The method for synergistic condensation and capture of volatile organic compounds according to claim 4, characterized in that, The hydrophobic volatile organic compounds include one or more of benzene compounds, halogenated aromatic hydrocarbons, and alkanes.

6. The method for synergistic condensation and capture of volatile organic compounds according to claim 3, characterized in that, When the volatile organic compounds are mainly polar volatile organic compounds, the volume fraction of volatile organic alcohols in the volatile organic alcohol solution is 30-60%.

7. The method for synergistic condensation and capture of volatile organic compounds according to claim 6, characterized in that, The polar volatile organic compounds include alcohols and / or amines.

8. The method for synergistic condensation and capture of volatile organic compounds according to claim 1, characterized in that, The average particle size of the microdroplets is 1~100μm.

9. The method for synergistic condensation and capture of volatile organic compounds according to claim 1 or 8, characterized in that, The atomization is pneumatic atomization, ultrasonic atomization, pressure atomization, or two-fluid atomization.

10. The method for synergistic condensation and capture of volatile organic compounds according to claim 1, characterized in that, The volume percentage of volatile organic compounds in the gas containing volatile organic compounds is 10-100%.

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