Raw material composition of soil remediation agent, soil remediation agent as well as preparation method and application of soil remediation agent

Abstract

The invention discloses a raw material composition of a soil remediation agent, the soil remediation agent and a preparation method and application of the soil remediation agent. The raw material composition of the soil remediation agent comprises the following substances in parts by weight: (1) 10 parts of alkyl polyether nitrogen-containing compound; and (2) 0.5-40 parts of fatty acid polyether ester. The soil remediation agent comprises a raw material composition of the soil remediation agent and a solvent. When the alkyl polyether nitrogen-containing compound and the fatty acid polyether ester are combined for use, good foam can be formed, the removal effect on organic pollutants (such as organochlorine) in soil is good, and the soil conditioner is green, easy to degrade and free of secondary pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of soil remediation, and more particularly to a raw material composition of a soil remediation agent, a soil remediation agent, and a preparation method and application thereof. Background Art

[0002] With the continuous progress of my country's construction and development, soil pollution is becoming increasingly serious. Pollutants from pesticides, dyes, petrochemicals, papermaking, and other chemical plants are the most prominent sources of soil pollution, primarily organic residues. Organochlorine pollutants, due to their stable structure, high toxicity, and resistance to decomposition in soil, take years to decades to naturally degrade. These pollutants are persistent, pose significant risks to human health and the environment, and are classified as highly hazardous and high-risk.

[0003] Soil remediation technologies can be divided into in-situ and ex-situ remediation technologies based on the remediation location. In-situ remediation is more economical, while ex-situ remediation offers lower environmental risks and easier-to-control treatment effects, but the treatment range is limited. In-situ chemical leaching is a chemical remediation technology that can efficiently and thoroughly remove soil contaminants. It primarily utilizes the volume-expanding effect of surfactants to encapsulate organic pollutants in an emulsion, which is then removed from the soil through flushing with the eluent. Simultaneously, the surfactants generate foam with selective permeability, expanding the swept volume. These two mechanisms operate simultaneously to achieve the goal of remediating contaminated soil.

[0004] Patent CN112159666A describes a composite biological cleaning agent for nickel-contaminated soil. The eluent is made from saponin, Tween 80, and citric acid. It can simultaneously remove polychlorinated biphenyls (PCBs) and heavy metals from soil, achieving a removal rate exceeding 80%. However, it uses an ex situ oscillation method. The document "Remediation with surfactant foam of PCP-contaminated soil" reports the use of a 1% Triton X-100 foam to remove pentachlorophenol (PCP) from soil, but the removal rate was only 85%.

[0005] Therefore, a more efficient remediation agent is needed to solve the problem of organic pollutants being retained in soil pores, being difficult to remove, and easily causing secondary pollution during the treatment process. Summary of the Invention

[0006] To address the problems encountered in the prior art, the present invention provides a raw material composition, a soil remediation agent, a preparation method, and applications thereof. The combination of the hydrocarbon polyether nitrogen-containing compound and the fatty acid polyether ester in the present invention can form a good foam, effectively removing organic pollutants (such as organochlorine) from the soil. Furthermore, the composition is environmentally friendly, easily degradable, and does not cause secondary pollution.

[0007] One of the purposes of the present invention is to provide a raw material composition of a soil remediation agent, which comprises the following substances in parts by weight:

[0008] (1) 10 parts of a hydrocarbyl polyether nitrogen-containing compound;

[0009] (2) 0.5-40 parts of fatty acid polyether ester, such as 0.5, 1, 6, 9, 12, 15, 20, 25, 30, 35, 40 parts, and any parameter range consisting of any two of the above values.

[0010] In the raw material composition of the soil remediation agent of the present invention, preferably,

[0011] The hydrocarbyl polyether nitrogen-containing compound has a molecular formula shown in formula (I):

[0012]

[0013] Wherein, the R is selected from the group consisting of C8 to C 24 Substituted or unsubstituted hydrocarbon group; for example, R is selected from C8, C9, C 10 、C 11 、C 12 、C 13 、C 14 、C 15 、C 16 、C 17 、C 18 、C 19 、C 20 、C 21 、C 22 、C 23 、C 24 a substituted or unsubstituted hydrocarbon group;

[0014] R2 and R3 are each independently selected from a substituted or unsubstituted alkyl group having carbon atoms of C1 to C5; for example, R2 and R3 are each independently selected from a substituted or unsubstituted alkyl group having carbon atoms of C1, C2, C3, C4, or C5;

[0015] R1 and R4 are each independently selected from a substituted or unsubstituted alkylene group having carbon atoms of C1 to C5; for example, R1 and R4 are each independently selected from a substituted or unsubstituted alkylene group having carbon atoms of C1, C2, C3, C4, or C5;

[0016] Y is a monovalent anionic group; x and y are each independently selected from any value in the range of 1 to 20; for example, x and y are each independently selected from 1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, and 20.

[0017] In the technical solution of the present invention, the hydrocarbon polyether nitrogen-containing compound can be prepared according to the existing commonly used preparation method, or can be prepared according to the following method of the present invention:

[0018] The preparation method of the hydrocarbon polyether nitrogen-containing compound comprises the following steps:

[0019] a. RCONHC3H6OH (preferably 1 mol) and barium sulfate catalyst (preferably 1 mol) are catalyzed and reacted with the required amount of ethylene oxide and propylene oxide in sequence under nitrogen protection (preferably at 180°C).

[0020] After the reaction is complete, the temperature is lowered and the catalyst is filtered to obtain compound A.

[0021]

[0022] b. Compound A (preferably 1 mol) is reacted with a tertiary amine (XR1) NR2R3 (1 mol) and sodium hydroxide (1.5 mol) in a solvent (preferably 500 ml of benzene), and the reaction is heated (preferably at 100 ° C;

[0023] The reaction was carried out for 10 hours), and then the solvent was removed by rotary evaporation to obtain compound B. wherein X is selected from any one of halogens, preferably, X is selected from Cl.

[0024]

[0025] c. Compound B (preferably 1 mol) is reacted with XR4YM (preferably 1.5 mol) and sodium hydroxide (preferably 1.5 mol) in a solvent (preferably 500 ml of toluene / benzene (v / v = 1)). The reaction is heated (preferably at 100°C for 10 hours). After acidification with 20 wt% hydrochloric acid, removal of water and inorganic salts, and solvent removal, the product is mixed with water and the pH is adjusted to alkaline (preferably with a 25 wt% aqueous sodium hydroxide solution to pH = 13) to obtain the compound of formula (I) - a hydrocarbyl polyether nitrogen-containing compound. wherein X is selected from any halogen, preferably Cl; and M is a cation that renders the molecular formula electrically neutral. M is selected from an alkali metal ion, preferably sodium or potassium.

[0026]

[0027] In the raw material composition of the soil remediation agent of the present invention, preferably,

[0028] The fatty acid polyether ester has a molecular formula shown in formula (II):

[0029]

[0030] Wherein, the R' is selected from the group consisting of C8 to C 24 Substituted or unsubstituted hydrocarbon group; for example, R' is selected from C8, C9, C 10 、C 11 、C 12 、C 13 、C 14 、C 15 、C 16 、C 17 、C 18 、C 19 、C 20 、C 21 、C 22 、C 23 、C 24 a substituted or unsubstituted hydrocarbon group;

[0031] R5 is selected from substituted or unsubstituted alkyl groups having carbon atoms of C1, C2, C3, C4, C5, or C6; for example, R5 is selected from substituted or unsubstituted alkyl groups having carbon atoms of C1 to C6;

[0032] m and n are each independently selected from any value between 0 and 30, and m+n is not zero; for example, m and n are each independently selected from 0, 1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, and m+n is not zero.

[0033] In the technical solution of the present invention, the fatty acid polyether ester can be prepared according to the existing commonly used preparation method, and can also be prepared according to the following method of the present invention:

[0034] Under the protection of nitrogen, the fatty acid ester R'COOR5 (1 mol) is heated and reacted with the required amount of ethylene oxide and propylene oxide in sequence (preferably at 180°C) under the catalysis of barium sulfate catalyst (preferably the catalyst is 1wt% of the mass of the fatty acid ester). After the reaction is completed, the temperature is lowered and the catalyst is filtered to obtain the compound of formula (II) - fatty acid polyether ester;

[0035]

[0036] In the raw material composition of the soil remediation agent of the present invention, preferably,

[0037] In formula (I),

[0038] R is selected from the group consisting of C 12 ~C 20 a saturated hydrocarbon group or an unsaturated hydrocarbon group; and / or,

[0039] R2 and R3 are each independently selected from a substituted or unsubstituted alkyl group having carbon atoms of C1 to C2; and / or, R1 and R4 are each independently selected from a substituted or unsubstituted alkylene group having carbon atoms of C1 to C2; and / or, Y is selected from a sulfonate group or a carboxylate group; and / or,

[0040] x and y are each independently selected from any value between 1 and 10;

[0041] Preferably,

[0042] x is selected from any value between 1 and 3; and / or,

[0043] y is any value selected from 2 to 5.

[0044] In the raw material composition of the soil remediation agent of the present invention, preferably,

[0045] In formula (II), R' is selected from the group consisting of C8 to C 18 a saturated hydrocarbon group or an unsaturated hydrocarbon group; and / or R5 is selected from a substituted or unsubstituted alkyl group having carbon atoms of C1 to C3; and / or m and n are each independently any value from 0 to 10, and m+n is not zero;

[0046] Preferably,

[0047] m is selected from any value between 4 and 8; and / or,

[0048] n is any value selected from 1 to 3.

[0049] In the raw material composition of the soil remediation agent of the present invention, preferably,

[0050] Calculated by weight, including the following substances:

[0051] (1) 10 parts of a hydrocarbyl polyether nitrogen-containing compound;

[0052] (2) 0.5-20 parts of fatty acid polyether ester;

[0053] Preferably,

[0054] Calculated by weight, including the following substances:

[0055] (1) 10 parts of a hydrocarbyl polyether nitrogen-containing compound;

[0056] (2) 1-10 parts of fatty acid polyether ester.

[0057] The second object of the present invention is to provide a soil remediation agent, comprising the raw material composition of the soil remediation agent described in one of the objects of the present invention and a solvent;

[0058] Preferably,

[0059] The solvent is selected from water; and / or,

[0060] The solvent accounts for 95 to 99.5 wt % of the total weight of the soil remediation agent.

[0061] The repair agent of the present invention may include, in addition to the hydrocarbon polyether nitrogen-containing compound and the fatty acid polyether ester, other substances commonly used in the art, as long as the total amount of each component meets the requirement of 100%.

[0062] The key active ingredients of the repair agent of the present invention are hydrocarbon polyether nitrogen-containing compounds and fatty acid polyether esters. Those skilled in the art will appreciate that, in order to facilitate transportation and storage or on-site use, various supply forms may be employed, such as a non-aqueous solid form, a water-containing solid form, a water-containing paste form, or an aqueous solution form; the aqueous solution form includes a concentrated solution prepared with water, which is directly prepared into a repair agent form having the concentration required for on-site oil recovery; there are no special requirements for water, which may be deionized water or water containing inorganic minerals, and the water containing inorganic minerals may be tap water or formation water.

[0063] The third object of the present invention is to provide a method for preparing a soil remediation agent, comprising the following steps: fully mixing the raw material composition of the soil remediation agent described in one of the objects of the present invention in a solvent to prepare the soil remediation agent; preferably, the soil remediation agent described in the second object of the present invention is prepared by the method.

[0064] The contaminated soil remediation agent is prepared by fully mixing the hydrocarbon polyether nitrogen-containing compound and the fatty acid polyether ester. The fully mixing here means that the solvent-soluble components are fully dissolved and the solvent-insoluble components are fully dispersed.

[0065] A fourth object of the present invention is to provide an application of the soil remediation agent as described in the second object of the present invention or the soil remediation agent prepared by the method described in the third object of the present invention in soil pollution remediation; preferably, the application in removing soil organic pollutants.

[0066] In the application of the present invention, preferably,

[0067] Injecting the soil remediation agent and gas into the contaminated soil, and adding water until no foam flows out;

[0068] Preferably, the injection volume of the soil remediation agent is 0.5-3.0 times the pore volume of the soil to be injected.

[0069] In the application of the present invention, preferably,

[0070] When injecting contaminated soil,

[0071] The gas flow rate is 0.2 to 200 mL / min; and / or,

[0072] The gas is selected from at least one of nitrogen, air or carbon dioxide; and / or,

[0073] The flow rate of the soil remediation agent is 0.1 to 50 mL / min; and / or,

[0074] The soil organic pollutants removed are chlorinated organic matter;

[0075] Preferably, the ratio of the soil remediation agent flow rate to the gas flow rate is 1:(1-4).

[0076] In the technical solution of the present invention, the soil pore volume can be calculated or measured using existing methods.

[0077] The soil remediation agent of the present invention can effectively remove chlorine-containing organic pollutants in contaminated soil; the removal rate of organic pollutants in the soil is over 90%.

[0078] The hydrocarbon polyether nitrogen-containing compound and the fatty acid polyether ester in the composition of the present invention are both green, easily degradable surfactants, avoiding secondary contamination of the stratum. The fatty acid polyether ester in the composition has excellent emulsifying properties, emulsifying organic matter and reducing the interfacial tension between the organic matter and water. The hydrocarbon polyether nitrogen-containing compound has an affinity for chlorine-containing organic matter, enabling it to be more effectively stripped from the soil. Furthermore, the hydrocarbon polyether nitrogen-containing compound has good foaming properties. When combined with the fatty acid polyether to form a foam, the adsorption capacity is increased, and the swept volume is expanded. The two components work synergistically to effectively remove organic pollutants from the soil.

[0079] The endpoints and any values of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of each range, the endpoint values of each range and a separate point value, and the separate point values can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be considered as specifically disclosed in this article. Hereinafter, in principle, each technical solution can be combined with each other to obtain a new technical solution, which should also be considered as specifically disclosed in this article.

[0080] Compared with the prior art, the present invention has the following advantages:

[0081] The soil organic pollutant remediation agent of the present invention can form good foam, has a good removal effect on organic pollutants (such as organochlorine) in the soil, is green, easily degradable, and will not cause secondary pollution.

[0082] The repair agent of the present invention can remove more than 90% of organic pollutants in the soil, achieving good technical effects.

[0083] The repair agent of the present invention can remove organic pollutants in the soil in situ, has simple operation and lower cost. DETAILED DESCRIPTION

[0084] The present invention will be described in detail below with reference to specific embodiments. It is necessary to point out that the following embodiments are only used to further illustrate the present invention and are not to be construed as limiting the scope of protection of the present invention. Non-essential improvements and adjustments made by those skilled in the art to the present invention based on the contents of the present invention still fall within the scope of protection of the present invention.

[0085] It should also be noted that the various specific technical features described in the following specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0086] In addition, the various embodiments of the present invention may be arbitrarily combined as long as they do not violate the concept of the present invention. The technical solutions thus formed belong to part of the original disclosure of this specification and also fall within the scope of protection of the present invention.

[0087] Unless otherwise specified, the raw materials used in the examples and comparative examples are all disclosed in the prior art, for example, they can be directly purchased or prepared according to the preparation methods disclosed in the prior art.

[0088] The content of organic pollutants in the soil was determined by gas chromatography.

[0089] The test method for soil pore volume is as follows:

[0090] Fill the simulated quartz sand into the simulated plane model of the soil. After filling the model, use a vacuum pump to evacuate the inside of the model, and then saturate it with water (absorb pure water into the model). Record the volume of water absorbed, which is the pore volume.

[0091] The hydrocarbon polyether nitrogen-containing compounds and fatty acid polyether esters used in the examples were prepared according to the following specific preparation examples:

[0092] Preparation Example 1

[0093] The preparation method of the hydrocarbon polyether nitrogen-containing compound comprises the following steps:

[0094] a. RCONHC3H6OH (1 mol) and barium sulfate catalyst (1 mol) were reacted with the required amounts of ethylene oxide and propylene oxide at 180°C under nitrogen protection. After the reaction, the temperature was lowered and the catalyst was filtered to obtain compound A.

[0095]

[0096] b. Compound A (1 mol) was reacted with (ClR1)NR2R3 (1 mol) and sodium hydroxide (1.5 mol) in 500 ml of benzene at a reaction temperature of 100 ° C. The reaction was carried out for 10 hours, and then the solvent was removed by rotary evaporation to give compound B.

[0097]

[0098] c. Compound B (1 mol) was reacted with ClR4YNa (1.5 mol) and sodium hydroxide (1.5 mol) in 500 ml of toluene / benzene (v / v = 1) at a reaction temperature of 100°C; the reaction was carried out for 10 hours. After acidification with 20 wt % hydrochloric acid, removal of water and inorganic salts, and evaporation of the solvent, the product was mixed with water and the pH of the system was adjusted to 13 with a 25 wt % aqueous sodium hydroxide solution to obtain a compound of formula (I) - a hydrocarbyl polyether nitrogen-containing compound.

[0099]

[0100] Preparation Example 2

[0101] The preparation method of fatty acid polyether ester comprises the following steps:

[0102] In the presence of barium sulfate catalyst (the catalyst is 1 wt% of the mass of the fatty acid ester), under nitrogen protection, the fatty acid ester R'COOR5 (1 mol) is reacted with the required amount of ethylene oxide and propylene oxide in sequence at 180°C. After the reaction is completed, the temperature is lowered and the catalyst is filtered to obtain the compound of formula (II) - fatty acid polyether ester;

[0103]

[0104] [Example 1]

[0105] Repair agent F-1 was prepared by dissolving a nitrogen-containing hydrocarbon polyether compound and a fatty acid polyether ester in tap water at a weight ratio of 10:2 to prepare a 2 wt% aqueous solution. The specific structural compositions of the nitrogen-containing hydrocarbon polyether compound and the fatty acid polyether ester are shown in Table 1.

[0106] [Example 2]

[0107] Repair agent F-2 was prepared by dissolving a nitrogen-containing hydrocarbon polyether compound and a fatty acid polyether ester in tap water at a weight ratio of 10:5 to prepare a 2 wt% aqueous solution. The specific structural compositions of the nitrogen-containing hydrocarbon polyether compound and the fatty acid polyether ester are shown in Table 1.

[0108] [Example 3]

[0109] Repair agent F-3 was prepared by dissolving the nitrogen-containing hydrocarbon polyether compound and the fatty acid polyether ester in tap water at a weight ratio of 10:10 to prepare a 2 wt% aqueous solution. The specific structural compositions of the nitrogen-containing hydrocarbon polyether compound and the fatty acid polyether ester are shown in Table 1.

[0110] [Example 4]

[0111] Repair agent F-4 was prepared by dissolving a nitrogen-containing hydrocarbon polyether compound and a fatty acid polyether ester in tap water at a weight ratio of 10:0.5 to prepare a 2 wt% aqueous solution. The specific structural compositions of the nitrogen-containing hydrocarbon polyether compound and the fatty acid polyether ester are shown in Table 1.

[0112] [Example 5]

[0113] Repair agent F-5 was prepared by dissolving the nitrogen-containing hydrocarbon polyether compound and the fatty acid polyether ester in tap water at a weight ratio of 10:40 to prepare a 2 wt% aqueous solution. The specific structural compositions of the nitrogen-containing hydrocarbon polyether compound and the fatty acid polyether ester are shown in Table 1.

[0114] Table 1 Structure of each component in the repair agent in the embodiment

[0115]

[0116] Note: R, R1, R2, R3, R4, R', and R5 in the embodiments of the present invention are all straight-chain alkyl groups.

[0117] Application Example 1

[0118] A plane sand filling model with different upper and lower permeabilities was prepared using quartz sand containing 1000 mg / L tetrachloroethylene, wherein the upper layer permeability was 4000 mD and the lower layer permeability was 100 mD. The soil remediation agent of the embodiment and nitrogen were co-injected for displacement at injection rates of 1.5 mL / min and 3 mL / min, respectively. After displacement of 1.0 PV (i.e., the injection volume of the remediation agent was 1 times the pore volume of the soil to be injected), water was injected until no foam flowed out. The tetrachloroethylene content in the quartz sand was detected, and the organic matter removal rate was calculated. The results are shown in Table 2.

[0119] Table 2 Removal rate of pollutants displaced by the repair agents in Examples 1-5

[0120] Example Example 1 Example 2 Example 3 Example 4 Example 5 Repair agent F-1 F-2 F-3 F-4 F-5 Organic matter removal rate% 95.1 93.3 90.2 86.1 83.5

[0121] [Comparative Example 1]

[0122] Only a single dose of the hydrocarbon polyether nitrogen-containing compound in [Example 1-2] (the amount of the single dose added is equal to the sum of the amounts of the hydrocarbon polyether nitrogen-containing compound and the fatty acid polyether ester in Example 1 or Example 2) is used as a repair agent. The pollutant displacement test is carried out in the same manner as in [Application Example 1]. The results are shown in Table 3.

[0123] [Comparative Example 2]

[0124] Only the fatty acid polyether ester single agent in [Example 1-2] (the amount of the single agent added is equal to the sum of the amounts of the hydrocarbon polyether nitrogen-containing compound and the fatty acid polyether ester in Example 1 or Example 2) is used as a repair agent, and the pollutant displacement test is carried out using the same method as [Application Example 1]. The results are shown in Table 3.

[0125] Table 3 Removal rate of pollutants displaced by the repair agent in the comparative example

[0126]

[0127] By comparing the results in Table 2 and Table 3, it can be seen that the combination of hydrocarbon polyether nitrogen-containing compounds and fatty acid polyethers has a synergistic effect, greatly improving the effect of removing soil organic pollutants.

[0128] Furthermore, the hydrocarbon polyether nitrogen-containing compound and the fatty acid polyether ester in the composition of the present invention are both green, easily degradable surfactants, thus avoiding secondary contamination of the stratum. The fatty acid polyether ester in the composition has excellent emulsifying properties, emulsifying organic matter and reducing the interfacial tension between the organic matter and water. The hydrocarbon polyether nitrogen-containing compound has an affinity for chlorine-containing organic matter, enabling it to be more effectively stripped from the soil. Furthermore, the hydrocarbon polyether nitrogen-containing compound has excellent foaming properties, and when combined with the fatty acid polyether to form a foam, the adsorption capacity is increased, and the swept volume is expanded. The two components work synergistically to effectively remove organic pollutants from the soil.

[0129] The present invention has been described in detail above with reference to specific embodiments and exemplary examples. However, these descriptions should not be construed as limiting the present invention. Those skilled in the art will appreciate that various equivalent substitutions, modifications, or improvements may be made to the technical solutions and implementations of the present invention without departing from the spirit and scope of the present invention, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be determined by the appended claims.

[0130] All publications, patent applications, patents, and other references mentioned in this specification are incorporated herein by reference. Unless otherwise defined, all technical and scientific terms used in this specification have the meanings conventionally understood by those skilled in the art. In the event of conflict, the definitions in this specification shall prevail.

[0131] When this specification uses the prefix "well known to those skilled in the art", "prior art" or similar terms to introduce materials, substances, methods, steps, devices or components, the objects introduced by the prefix include those commonly used in the art when this application is filed, but also include those that are not commonly used at present but will become generally recognized in the art to be suitable for similar purposes.

[0132] In the context of this specification, any matters or items not mentioned are directly applicable to those known in the art without any changes except those explicitly stated.

Claims

1. A raw material composition of a soil remediation agent, characterized in that: Calculated by weight, including the following substances: (1) 10 parts of a hydrocarbyl polyether nitrogen-containing compound; (2) 0.5-40 parts of fatty acid polyether ester.

2. The raw material composition of the soil remediation agent according to claim 1, characterized in that: The hydrocarbyl polyether nitrogen-containing compound has a molecular formula shown in formula (I): Wherein, the R is selected from the group consisting of C8 to C 24 a substituted or unsubstituted hydrocarbon group; R2 and R3 are each independently selected from a substituted or unsubstituted alkyl group having carbon atoms of C1 to C5; R1 and R4 are each independently selected from a substituted or unsubstituted alkylene group having carbon atoms of C1 to C5; Y is a monovalent anionic group; x and y are each independently selected from any value within the range of 1 to 20.

3. The raw material composition of the soil remediation agent according to claim 1, characterized in that: The fatty acid polyether ester has a molecular formula shown in formula (II): Wherein, the R' is selected from the group consisting of C8 to C 24 a substituted or unsubstituted hydrocarbon group; R5 is selected from a substituted or unsubstituted alkyl group having carbon atoms of C1 to C6; m and n are each independently selected from any value between 0 and 30, and m+n is not zero.

4. The raw material composition of the soil remediation agent according to claim 2, characterized in that: In formula (I), R is selected from the group consisting of C 12 ~C 20 a saturated hydrocarbon group or an unsaturated hydrocarbon group; and / or, R2 and R3 are each independently selected from a substituted or unsubstituted alkyl group having carbon atoms of C1 to C2; and / or, R1 and R4 are each independently selected from a substituted or unsubstituted alkylene group having carbon atoms of C1 to C2; and / or, Y is selected from a sulfonate group or a carboxylate group; and / or, x and y are each independently selected from any value between 1 and 10; Preferably, x is selected from any value between 1 and 3; and / or, y is any value selected from 2 to 5.

5. The raw material composition of the soil remediation agent according to claim 3, characterized in that: In formula (II), R' is selected from the group consisting of C8 to C 18 a saturated or unsaturated hydrocarbon group; and / or, R5 is selected from a substituted or unsubstituted alkyl group having carbon atoms of C1 to C3; and / or, m and n are each independently any value between 0 and 10, and m+n is not zero; Preferably, m is selected from any value between 4 and 8; and / or, n is any value selected from 1 to 3.

6. The raw material composition of the soil remediation agent according to claim 1, characterized in that Calculated by weight, including the following substances: (1) 10 parts of a hydrocarbyl polyether nitrogen-containing compound; (2) 0.5-20 parts of fatty acid polyether ester; Preferably, Calculated by weight, including the following substances: (1) 10 parts of a hydrocarbyl polyether nitrogen-containing compound; (2) 1-10 parts of fatty acid polyether ester.

7. A soil remediation agent comprising the raw material composition of the soil remediation agent according to any one of claims 1 to 6 and a solvent; Preferably, The solvent is selected from water; and / or, The solvent accounts for 95 to 99.5 wt % of the total weight of the soil remediation agent.

8. A method for preparing a soil remediation agent, comprising the following steps: The raw material composition of the soil remediation agent according to any one of claims 1 to 6 is fully mixed in a solvent to prepare the soil remediation agent; preferably, the soil remediation agent according to claim 7 is prepared by the method.

9. Use of the soil remediation agent according to claim 7 or the soil remediation agent prepared by the method according to claim 8 in soil pollution remediation; preferably in removing soil organic pollutants.

10. The use according to claim 9, characterized in that: Injecting the soil remediation agent and gas into the contaminated soil, and adding water until no foam flows out; Preferably, the injection volume of the soil remediation agent is 0.5-3.0 times the pore volume of the soil to be injected.

11. The use according to claim 10, characterized in that: When injecting contaminated soil, The gas flow rate is 0.2 to 200 mL / min; and / or, The gas is selected from at least one of nitrogen, air or carbon dioxide; and / or, The flow rate of the soil remediation agent is 0.1 to 50 mL / min; and / or, The soil organic pollutants removed are chlorinated organic matter; Preferably, the ratio of the soil remediation agent flow rate to the gas flow rate is 1:(1-4).

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