CN110871212B - Preparation for removing volatile organic compound, application thereof and method for removing volatile organic compound - Google Patents

Preparation for removing volatile organic compound, application thereof and method for removing volatile organic compound Download PDF

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CN110871212B
CN110871212B CN201811001653.6A CN201811001653A CN110871212B CN 110871212 B CN110871212 B CN 110871212B CN 201811001653 A CN201811001653 A CN 201811001653A CN 110871212 B CN110871212 B CN 110871212B
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volatile organic
cyclodextrin
preparation
organic compounds
surfactant
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CN110871212A (en
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冯婕
王岽
王亭
胡艳华
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Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
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Sinopec Beijing Research Institute of Chemical Industry
China Petroleum and Chemical Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/08—Reclamation of contaminated soil chemically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/708—Volatile organic compounds V.O.C.'s
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention relates to the field of environmental management and discloses a preparation for removing volatile organic compounds, application thereof and a method for removing the volatile organic compounds, wherein the method comprises the following steps: (1) preparing a volatile organic compound removing preparation; (2) adding the preparation to the place to be treated to ensure that the concentration of the volatile organic compounds at the place to be treated is lower than 16 mg/L; wherein the formulation comprises a cyclodextrin and/or a derivative thereof. The method for removing the volatile organic compounds can be applied to air, water and soil, has good treatment effect and high speed, and the used medicament is green and environment-friendly, does not produce secondary pollution in the process, and is simple and convenient and wide in application range.

Description

Preparation for removing volatile organic compound, application thereof and method for removing volatile organic compound
Technical Field
The invention relates to the field of environmental management, in particular to a preparation for removing volatile organic compounds, application thereof and a method for removing the volatile organic compounds.
Background
Volatile Organic Compounds (VOCs) are abbreviated as VOCs, and VOCs in the general sense are commanding organic compounds; but the definition in the environmental protection sense refers to an active class of volatile organic compounds, namely, volatile organic compounds which can cause harm. With the rapid development of industry, nearly 60 million tons of organic matters in China cause soil-underground water system pollution through various ways every year. The VOC can cause serious pollution to surrounding air while polluting soil and underground water, and when the VOC in the air reaches a certain value, symptoms such as headache, nausea, vomiting, hypodynamia and the like can be caused, and even convulsion, coma, liver, kidney, brain and nervous system are caused in serious cases, so that serious consequences such as hypomnesis and the like are caused. And the disturbance to the polluted area is large in the process of remediation and treatment, along with the air flow, large-area VOC pollution can be caused if the control cannot be carried out in time, sometimes, the VOC pollution range is larger than that of the polluted area of soil and underground water, and great harm exists.
The traditional VOC air purification usually adopts physical adsorption or filtration technology for air treatment, and the purification devices have certain limitations on air purification, have low physical adsorption capacity, are easy to saturate and need to continuously replace an adsorbent; the filtering technology has the advantages of limited catalyst, small contact area with air, slow reaction and unstable treatment effect, and the two methods only aim at the VOC in the air and do not treat the VOC source, so that the VOC source cannot be fundamentally cut off.
CN103639184A discloses a method for circularly remediating organic contaminated soil by using cyclodextrin eluent, which comprises the following steps: (1) adding the organic contaminated soil into cyclodextrin eluent with the concentration of 100-500 mu mol/L to form a soil-eluent mixture with the organic contaminated soil content of 20-40g/L, and eluting the soil-eluent mixture at the temperature of 15-35 ℃; (2) carrying out centrifugal separation on the eluted soil-eluent mixture, and determining the concentration of organic pollutants in the filtrate; (3) placing the filtrate obtained in the step (2) under an ultraviolet lamp, and irradiating until the concentration of organic pollutants in the filtrate is less than or equal to 5% of the concentration of the organic pollutants determined in the step (2), so as to obtain regenerated cyclodextrin eluent; repeating steps (1) - (3) using the regenerated cyclodextrin eluent instead of the cyclodextrin eluent in step (1). The method transfers organic pollutants from the soil to the eluent, a large amount of eluent is generated, the eluent is complex to process and is easy to cause secondary pollution, organic matters in the soil are also taken away by the eluent in the process of eluting the pollutants, the influence on the soil is large, and the effect of the cyclodextrin and the derivatives thereof on removing the VOC is not involved in the patent.
Therefore, there is a need in the art to remove volatile organic compounds from various environments by a simple, rapid, and efficient method.
Disclosure of Invention
The invention aims to overcome the problems of complex operation of VOC removal and limited VOC removal environment in the prior art, and provides a preparation for removing volatile organic compounds, application thereof and a method for removing the volatile organic compounds.
The inventor of the present invention found in research that, compared with other types of cyclodextrin and/or its derivative, when the cyclodextrin and/or its derivative in the formulation of the present invention is β -cyclodextrin, the volatile organic compound removal effect is better, and in addition, a surfactant and an alcohol may be added to the formulation formulated in the present invention, and after the surfactant and the alcohol are added, the volatile organic compound removal effect is significantly improved, and when the weight ratio of cyclodextrin, surfactant and alcohol is 100: (3-6): (1-3), the removal of volatile organic compounds by the preparation can be more effective.
In order to achieve the above object, a first aspect of the present invention provides a method for removing volatile organic compounds, the method comprising the steps of:
(1) preparing a volatile organic compound removing preparation;
(2) adding the preparation to the place to be treated to ensure that the concentration of the volatile organic compounds at the place to be treated is lower than 16 mg/L;
wherein the formulation comprises a cyclodextrin and/or a derivative thereof.
The second aspect of the present invention provides a formulation having a function of removing volatile organic compounds, which comprises the following components in a weight ratio of 100: (1-30): (1-25) Cyclodextrin and/or its derivative, a surfactant and an alcohol, wherein the alcohol is C2-C6The alcohol of (1).
In a third aspect the invention provides the use of a method according to the invention for the removal of volatile organic compounds.
Through the technical scheme, the method for removing the volatile organic compounds has the following advantages:
the preparation used by the method does not generate waste gas, waste liquid and waste residue in the using process, and the removed volatile organic compounds are difficult to separate from the inclusion compound formed by the preparation, so that secondary pollution to the environment is avoided;
(II) the operation is simple, large-scale equipment is not needed, the treatment speed is high, the effect is obvious, and the volatile organic compounds can be fundamentally removed;
(III) the method for removing the volatile organic compounds is slightly influenced by environmental factors, can be used for removing the volatile organic compounds in different environments, and is particularly suitable for soil and/or air.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In a first aspect, the present invention provides a method for removing volatile organic compounds, the method comprising the steps of:
(1) preparing a volatile organic compound removing preparation;
(2) adding the preparation to the place to be treated to ensure that the concentration of the volatile organic compounds at the place to be treated is lower than 16 mg/L;
wherein the formulation comprises a cyclodextrin and/or a derivative thereof.
In the present invention, the formulation may further comprise a surfactant and an alcohol selected from C2-C6Preferably the cyclodextrin and/or derivative thereof, surfactant and alcohol are present in a weight ratio of 100: (1-30): (1-25), preferably 100: (2-8): (1-5), more preferably 100: (3-6): (1-3), one of the preferred embodiments according to the present inventionIn one embodiment, the addition of a formulation comprising a surfactant and an alcohol to the locus to be treated results in a concentration of volatile organic compounds to be treated of less than 6 mg/L.
In the present invention, the formulation may further include water, and the formulation is formulated into a solution or a suspension with water. When used to remove volatile organic compounds other than water (e.g., volatile organic compounds in soil and/or air), the formulation preferably contains water, thereby allowing the formulation to disperse more uniformly and provide better treatment. In particular, when the preparation is used for removing volatile organic compounds from soil having a water content of 20% or less and/or air having a humidity of 50% or less, the preparation preferably contains water.
In the water-containing formulation of the present invention, the concentration of the cyclodextrin and/or its derivative may be 20 to 80g/L, preferably 40 to 60g/L (41g/L, 42g/L, 43g/L, 44g/L, 45g/L, 46g/L, 47g/L, 48g/L, 49g/L, 50g/L, 51g/L, 52g/L, 53g/L, 54g/L, 55g/L, 56g/L, 57g/L, 58g/L, 59g/L or any value therebetween).
In the present invention, the cyclodextrin and/or its derivative may be commercially available, and is preferably at least one of α -cyclodextrin, β -cyclodextrin, γ -cyclodextrin, hydroxypropyl- β -cyclodextrin, carboxymethyl- β -cyclodextrin, hydroxyethyl- β -cyclodextrin and sulfonated- β -cyclodextrin, and is preferably β -cyclodextrin.
In the present invention, since cyclodextrin is stable in an alkaline medium, the pH of the preparation is 7 to 12, preferably 7 to 8, and in the present invention, an alkaline pH adjusting agent may be added to adjust the pH.
According to the invention, the cyclodextrin is of a molecular structure with 'inner hydrophobicity and outer hydrophilicity', so that the cyclodextrin becomes a biological model molecule similar to an enzyme, the cyclodextrin has unique inclusion performance, has the characteristics of no toxic or side effect, low price and easiness in obtaining, and due to the excellent characteristics of the structure of the cyclodextrin, the preparation disclosed by the invention forms an inclusion after absorbing an organic volatile compound, and the formed inclusion does not need to be further treated. The cyclodextrin derivative in the present invention means various substances having a cyclodextrin skeleton structure.
In the invention, the surfactant has hydrophilic and lipophilic groups, can be directionally arranged on the surface of the solution, can obviously reduce the surface tension of the solution, has an interaction promoting effect with the cyclodextrin, and can further improve the inclusion performance of the cyclodextrin.
In the present invention, the surfactant may be selected from at least one of ionic surfactants, nonionic surfactants, amphoteric surfactants, and nonionic surfactants, preferably anionic surfactants and/or nonionic surfactants, and more preferably at least one of sodium dodecylbenzene sulfonate, sodium dodecylsulfate, and polyoxyethylene-8-octylphenyl ether (triton).
In the invention, the addition of the alcohol can reduce the repulsion between the polarities of the surfactant molecules, so that the surfactant molecules are more compact, and meanwhile, the alcohol has a solubilizing effect on volatile organic compounds, is beneficial to dissolving out the volatile organic compounds from pollutants, and plays a promoting role in cyclodextrin inclusion of the pollutants. In the present invention, the alcohol may be a monohydric alcohol, preferably ethanol and/or isopropanol.
According to a most preferred embodiment of the invention, the formulation comprises beta-cyclodextrin, sodium lauryl sulfate surfactant, ethanol and water, the formulation comprises 50-60g/L beta-cyclodextrin, and the weight ratio of beta-cyclodextrin, sodium lauryl sulfate surfactant and ethanol is 100: (3-6): (1-3).
In the present invention, the place to be treated is not particularly limited, and may be at least one of soil, air and water, for example, when the place to be treated is soil and/or air, the water content in soil is less than or equal to 20%, and when the humidity in air is less than or equal to 50%, the preparation may be prepared into a solution or suspension with a certain concentration by using water, and the preparation is directly added to the place to be treated; when the site to be treated is water or when the water content of the soil and/or the soil in the air of the site to be treated is greater than 20% and the humidity of the air is greater than 50%, the preparation may be a mixture (powder) of cyclodextrin and/or its derivative, a surfactant and an alcohol, but in view of maximizing the utilization rate of the preparation, according to a preferred embodiment of the present invention, the preparation is a solution or a suspension, that is, a preparation containing water.
In the present invention, it is preferable that the addition is performed at room temperature without heat treatment of the treatment site or the preparation. The specific adding mode has no special requirement, when the added preparation is powder, a raising and scattering mode can be adopted, and when the preparation is solution or suspension, a spraying (by means of a spray can and the like) mode can be adopted.
In the invention, the adding mode is intermittent, the area of the part to be treated is taken as a calculation unit, and the adding amount (excluding water) of the preparation on a dry basis can be 0.5-15g/m2The time interval between two adjacent adding times can be 2-10min each time. Wherein the area of the to-be-treated part is the sum of the areas of the contact surfaces of the pollution source and the air.
Preferably, the dosage of the formulation (excluding water) on a dry basis may be from 6 to 11g/m2The time interval between two adjacent adding times can be 2-5min each time.
In the invention, when the concentration of the volatile organic compound at the position to be treated is higher than 300mg/L, the adding amount of the preparation ensures that the adding total amount of the cyclodextrin and/or the derivative thereof is more than 60g/m2；
Or when the concentration of the volatile organic compound at the position to be treated is 100-300mg/L, the adding amount of the preparation ensures that the adding total amount of the cyclodextrin and/or the derivative thereof is 35-60g/m2；
Or when the concentration of the volatile organic compound at the position to be treated is lower than 100mg/L, the adding amount of the preparation ensures that the adding total amount of the cyclodextrin and/or the derivative thereof is 20-35g/m2。
In the present invention, the number of the addition is not particularly limited as long as the VOC can be reduced to less than 16mg/L, preferably less than 6mg/L, and more preferably less than 2 mg/L. According to a preferred embodiment of the present invention, the adding times are 7 to 15 times, and more preferably, the adding times are 7 to 12 times.
The fourth aspect of the present invention provides a preparation having a function of removing volatile organic compounds, which comprises the following components in a weight ratio of 100: (1-30): (1-25) Cyclodextrin and/or its derivative, a surfactant and an alcohol, wherein the alcohol is C2-C6The alcohol of (1).
Preferably, the weight ratio of the cyclodextrin and/or its derivative, the surfactant and the alcohol is 100: (2-8): (1-5), more preferably 100: (3-6): (1-3).
In the present invention, the formulation may further comprise water, preferably the concentration of the cyclodextrin and/or its derivative is 20 to 80g/L, more preferably 40 to 60 g/L.
In the present invention, the cyclodextrin and/or its derivative may be commercially available, and is preferably at least one of α -cyclodextrin, β -cyclodextrin, γ -cyclodextrin, hydroxypropyl- β -cyclodextrin, carboxymethyl- β -cyclodextrin, hydroxyethyl- β -cyclodextrin and sulfonated- β -cyclodextrin, and is preferably β -cyclodextrin.
In the present invention, the surfactant may be selected from at least one of ionic surfactants, nonionic surfactants, amphoteric surfactants, and nonionic surfactants, preferably anionic surfactants and/or nonionic surfactants, and more preferably at least one of sodium dodecylbenzene sulfonate, sodium dodecylsulfate, and polyoxyethylene-8-octylphenyl ether (triton).
In the present invention, the alcohol may be a monohydric alcohol, preferably ethanol and/or isopropanol.
According to a most preferred embodiment of the invention, the formulation comprises beta-cyclodextrin, sodium lauryl sulfate surfactant, ethanol and water, the formulation comprises 50-60g/L beta-cyclodextrin, and the weight ratio of beta-cyclodextrin, sodium lauryl sulfate surfactant and ethanol is 100: (3-6): (1-3).
In a third aspect the invention provides the use of a formulation according to the invention for the removal of volatile organic compounds.
In the present invention, the application range of the preparation is not particularly limited, and the preparation can be used in any environment (place to be treated) contaminated with volatile organic compounds, for example, in air, soil and water contaminated with volatile organic compounds.
The present invention will be described in detail below by way of examples. In the following examples of the present invention,
the air humidity (namely the air humidity in the ground triangular flask) is measured by a GBT 11605-2005 humidity measuring method;
the soil moisture content was measured by a drying method (drying in an oven to a constant weight at 105 ℃), wherein the moisture content (%) was (soil wet weight (g) -soil dry weight (g)) x 100/soil wet weight (g);
the VOC value in the air of the ground triangular flask is measured by a VOC detector (American Rayleigh (RAE) model MiniRAE Lite-PGM7300 of the manufacturer);
the VOC value in the soil is measured by a headspace/gas chromatography-mass spectrometry (gas chromatography-mass spectrometer, Nippon Shimadzu model GCMS-TQ8030 of the manufacturer) for measuring volatile organic compounds in the soil and sediments by HJ 642-2013;
the concentration of petroleum hydrocarbon in the soil is measured by an infrared photometry (an infrared oil measuring instrument, a model JLGG-129U of a northern optical analyzer in Jilin city, a manufacturer) for measuring HJ soil petroleum;
the raw material beta-cyclodextrin is purchased from Tianjin Guangfu Fine chemical research institute and is analytically pure;
the raw materials of alpha-cyclodextrin and gamma-cyclodextrin are purchased from Aladdin reagent company and are analytically pure;
raw materials of sulfonated-beta-cyclodextrin, hydroxypropyl-beta-cyclodextrin and carboxymethyl-beta-cyclodextrin are purchased from national medicine group chemical reagent limited company and are analytically pure;
in the following examples, unless otherwise specified, various raw materials used were commercially available and were analytically pure.
Example 1
And respectively measuring VOC values of air (the humidity is 35%) and a soil sample (the water content is 0%) in the ground triangular flask and the concentration of petroleum hydrocarbon in the soil sample by taking the soil sample as a pollution source.
1) Weighing 5g of beta-cyclodextrin, 0.3g of sodium dodecyl sulfate and 0.15g of ethanol, dissolving in water, and diluting to 100mL to obtain a preparation with a pH value of 7.1, and shaking uniformly for later use;
2) weighing 10g of soil sample polluted by petroleum hydrocarbon, placing the soil sample into a 100mL ground triangular flask, sealing, shaking uniformly and flatly paving the flask for about 25cm2Standing;
3) the VOC value in the air in the ground triangular flask when the preparation was not sprayed was 165.7mg/L, and the VOC value in the soil and the petroleum hydrocarbon concentration in the soil sample were measured, the results are shown in Table 1;
4) spraying 0.3mL of the preparation prepared in the step 1) into a ground triangular flask and fully and uniformly stirring;
5) standing for 3 minutes, and measuring the VOC value in the gas in the ground triangular flask;
6) the procedure of step 4) and step 5) was repeated, and after spraying the formulation of step 1) 8 times in total, the VOC values of the air and soil samples in the ground flask and the petroleum hydrocarbon concentration in the soil samples were measured, and the results are shown in table 1.
Example 2
And respectively measuring VOC values of air (humidity is 40%) and a soil sample (water content is 0%) in the ground triangular flask and the concentration of petroleum hydrocarbon in the soil sample by taking the soil sample as a pollution source.
1) Weighing 5.5g of beta-cyclodextrin, 0.2g of sodium dodecyl sulfate and 0.2g of ethanol, dissolving in water, and diluting to 100mL to obtain a preparation with a pH value of 7.4, and shaking uniformly for later use;
2) weighing 10g of soil sample polluted by petroleum hydrocarbon, placing the soil sample into a 100mL ground triangular flask, sealing, shaking uniformly and flatly paving the flask for about 25cm2Standing;
3) the VOC value in the air in the ground triangular flask when the preparation is not sprayed is determined to be 250.1mg/L, and the VOC value in the soil and the petroleum hydrocarbon concentration in the soil sample are determined, and the results are shown in Table 1;
4) spraying 0.3mL of the preparation prepared in the step 1) into a ground triangular flask and fully and uniformly stirring;
5) standing for 2 minutes, and measuring the VOC value in the gas in the ground triangular flask;
6) the procedure of step 4) and step 5) was repeated, and after spraying the formulation of step 1) 9 times in total, the VOC values of the air and soil samples in the ground flask and the petroleum hydrocarbon concentration in the soil samples were measured, and the results are shown in table 1.
Example 3
And respectively measuring VOC values of air (humidity is 45%) and a soil sample (water content is 0%) in the ground triangular flask and the concentration of petroleum hydrocarbon in the soil sample by taking the soil sample as a pollution source.
1) Weighing 6g of beta-cyclodextrin, 0.25g of sodium dodecyl sulfate and 0.1g of ethanol, dissolving in water, and diluting to 100mL to obtain a preparation with a pH value of 7.6, and shaking uniformly for later use;
2) weighing 10g of soil sample polluted by petroleum hydrocarbon, placing the soil sample into a 100mL ground triangular flask, sealing, shaking uniformly and flatly paving the flask for about 25cm2Standing;
3) the VOC value in the air in the ground triangular flask when the preparation is not sprayed is determined to be 315.5mg/L, and the VOC value in the soil and the petroleum hydrocarbon concentration in the soil sample are determined, and the results are shown in Table 1;
4) spraying 0.3mL of the dosing preparation prepared in the step 1) into the ground triangular flask and fully and uniformly stirring;
5) standing for 5 minutes, and measuring the VOC value in the gas in the ground triangular flask;
6) the procedure of step 4) and step 5) was repeated, and after spraying the formulation of step 1) 10 times in total, the VOC values of the air and soil samples in the ground flask and the petroleum hydrocarbon concentration in the soil samples were measured, and the results are shown in table 1.
Example 4
Soil samples and air in ground flasks were freed of volatile organic compounds by the method of example 1, except that the surfactant added was sodium dodecylbenzenesulfonate, and the results are shown in Table 1.
Example 5
Soil samples and air in ground flasks were freed of volatile organic compounds by the method of example 1, except that the alcohol added was isopropanol, and the results are shown in Table 1.
Example 6
Soil samples and air in ground flasks were freed of volatile organic compounds by the method of example 1, except that the cyclodextrin added was alpha-cyclodextrin, and the results are shown in Table 1.
Example 7
Soil samples and air in ground flasks were freed of volatile organic compounds by the method of example 1, except that the cyclodextrin added was sulfonated-beta-cyclodextrin, the results of which are shown in Table 1.
Example 8
Soil samples and air in ground flasks were freed of volatile organic compounds by the method of example 1, except that the cyclodextrin added was gamma-cyclodextrin, and the results are shown in Table 1.
Example 9
Soil samples and air in ground flasks were freed of volatile organic compounds by the method of example 1, except that the cyclodextrin added was hydroxypropyl- β -cyclodextrin, the results of which are shown in table 1.
Example 10
Soil samples and air in ground flasks were freed of volatile organic compounds by the method of example 1, except that the cyclodextrin added was carboxymethyl- β -cyclodextrin, the results of which are shown in table 1.
Example 11
The soil samples and air in the ground flask were freed of volatile organic compounds by the method of example 1, except that the surfactant added was fatty alcohol polyoxyethylene ether.
Example 12
Soil samples and air in ground flasks were freed of volatile organic compounds by the method of example 1, except that the alcohol added was n-propanol.
Example 13
Soil samples and air in ground flasks were freed of volatile organic compounds by the method of example 1, except that 4g of beta-cyclodextrin was added to the formulated formulation, and the results are shown in Table 1.
Example 14
Soil samples and air in ground flasks were freed of volatile organic compounds by the method of example 1, except that 0.1g of sodium lauryl sulfate was used in the formulation, and the results are shown in Table 1.
Example 15
Soil samples and air in ground flasks were freed of volatile organic compounds by the method of example 1, except that the amount of ethanol added to the formulated formulation was 0.02g, as shown in Table 1.
Example 16
The soil sample and the air in the ground flask were freed of volatile organic compounds by the method of example 1, except that 0.13mL of volatile organic compounds was added to the soil sample in the ground flask each time, and the results are shown in Table 1.
Example 17
Soil samples and air in ground flasks were freed of volatile organic compounds by the method of example 1, except that the surfactant sodium lauryl sulfate was not added, and the results are shown in Table 1.
Example 18
Soil samples and air in ground flasks were freed of volatile organic compounds by the method of example 1, except that no ethanol was added, and the results are shown in Table 1.
Example 19
Soil samples and air in ground flasks were freed of volatile organic compounds by the method of example 1, except that the surfactants sodium lauryl sulfate and ethanol were not added, and the results are shown in Table 1.
Example 20
The soil sample and the air in the ground triangular flask were freed of volatile organic compounds by the method of example 1, except that no water was added to the preparation, the soil sample had a water content of 25% and the air had a humidity of 55%, and the specific procedure was as follows:
1) weighing 120mg of beta-cyclodextrin, 7.2mg of sodium dodecyl sulfate and 3.6mg of ethanol, and uniformly mixing for later use;
2) weighing 10g of soil sample polluted by petroleum hydrocarbon and placing the soil sample in a container 10Sealing in 0mL ground triangular flask, shaking uniformly and spreading for about 25cm2Standing;
3) measuring the VOC value in the air in the ground triangular flask when the preparation is not added to be 165.7mg/L, and measuring the VOC value in the soil and the concentration of petroleum hydrocarbon in the soil sample, wherein the results are shown in Table 1;
4) adding the preparation prepared in the step 1) into a ground triangular flask and fully and uniformly stirring;
5) after standing for 5 minutes, the VOC values of the air and soil samples in the ground flask and the petroleum hydrocarbon concentration in the soil samples were measured, and the results are shown in table 1.
Comparative example 1
Soil samples and air from ground flasks were freed of volatile organic compounds by the method of example 1, except that no beta-cyclodextrin was added to the formulation, and the results are shown in Table 1.
Comparative example 2
Soil samples and air in ground flasks were stripped of volatile organic compounds by the method of example 1, except that only water was added to the formulation, and the results are shown in Table 1.
TABLE 1
Figure BDA0001783099700000141
The results in table 1 show that, according to the preparation and the method for removing volatile organic compounds provided by the present invention, firstly, the VOC value in the air can be reduced to below 2mg/L after 8-10 times of addition in examples 1-3, and the removal rate of the volatile organic compounds in the air can reach above 98%;
secondly, as can be seen from examples 1, 4 and 11, the surfactant is sodium dodecylbenzenesulfonate, which has the best removal effect on volatile organic compounds; it can be seen from example 1, example 5 and example 12 that the removal of volatile organic compounds with alcohol being ethanol is the best; as can be seen from example 1 and examples 6-10, the removal of volatile organic compounds, cyclodextrin being β -cyclodextrin, is the best;
again, as can be seen from examples 1-3 and examples 13-15, the concentration ratio of β -cyclodextrin, surfactant and alcohol in examples 1-3 was between 100: (3-6): (1-3) the best effect of removing volatile organic compounds is obtained;
finally, as can be seen from examples 1 and 16, the dosage of the preparation is 6-11g/m2When the content is within the range, the removal effect of the volatile organic compound is best; as can be seen from example 1 and examples 17 and 18, the formulations incorporating both surfactant and alcohol provide the best removal of volatile organic compounds; as can be seen from examples 1 and 19, the addition of the surfactants sodium lauryl sulfate and ethanol further improves the removal effect of the volatile organic compounds of the formulation; it can be seen from examples 1 and 20 that the formulations with the addition of water have the best removal of volatile organic compounds.
In addition, the preparation and the method for removing the volatile organic compounds can reduce the content of the volatile organic compounds and petroleum hydrocarbon in the polluted soil sample, and the preparation is non-toxic and harmless, does not need large-scale equipment in the treatment method, is simple in operation method, and has good popularization and application values.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.

Claims (11)

1. A method for removing volatile organic compounds, the method comprising the steps of:
(1) preparing a volatile organic compound removing preparation;
(2) adding the preparation to the place to be treated to ensure that the concentration of the volatile organic compounds at the place to be treated is lower than 16 mg/L;
wherein the formulation comprises beta-cyclodextrin;
the formulation further comprises a surfactant and an alcohol selected from C2-C3The weight ratio of the beta-cyclodextrin, the surfactant and the alcohol is 100: (3-6): (1-5);
the preparation also comprises water, and the concentration of the beta-cyclodextrin is 20-80 g/L;
the addition is carried out at room temperature.
2. The method of claim 1, wherein,
the concentration of the beta-cyclodextrin is 40-60 g/L.
3. The method of claim 1, wherein,
the surfactant is selected from at least one of ionic surfactant, nonionic surfactant, amphoteric surfactant and nonionic surfactant.
4. The method of claim 3, wherein,
the surfactant is an anionic surfactant and/or a nonionic surfactant.
5. The method of claim 4, wherein,
the surfactant is at least one selected from sodium dodecyl benzene sulfonate, sodium dodecyl sulfate and polyoxyethylene-8-octyl phenyl ether.
6. The method according to claim 1, wherein the alcohol is selected from at least one of ethanol, isopropanol, and n-propanol.
7. The method according to claim 1, wherein the dosing in step (2) is intermittent, and the dosage of the preparation is 0.5-15g/m on a dry basis2Each time; the time interval between two adjacent adding times is 2-10 min.
8. The method of claim 7, wherein the formulation is administered in an amount of 6-11g/m on a dry basis2Each time; the time interval between two adjacent adding times is 2-5 min.
9. The method according to claim 1, wherein the formulation is added in such an amount that the beta-cyclodextrin is always added in an amount of more than 60g/m at a concentration of the volatile organic compound in the area to be treated higher than 300mg/L2；
Or when the concentration of the volatile organic compound at the position to be treated is 100-300mg/L, the adding amount of the preparation ensures that the adding total amount of the beta-cyclodextrin is 35-60g/m2；
Or when the concentration of the volatile organic compound at the position to be treated is lower than 100mg/L, the adding amount of the preparation ensures that the adding total amount of the beta-cyclodextrin is 20-35g/m2。
10. A preparation with a function of removing volatile organic compounds comprises the following components in a weight ratio of 100: (3-6): (1-5) beta-cyclodextrin, a surfactant and an alcohol, wherein the alcohol is C2-C3A monohydric alcohol of (1).
11. Use of the method of any one of claims 1 to 9 or the formulation of claim 10 for the removal of volatile organic compounds.
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