Antistatic agent for fuel oil and method for producing the same

Abstract

The application provides a kind of antistatic agent for fuel oil and its preparation method, belongs to the technical field of petroleum chemical industry, comprising the following steps: step S1, soybean lecithin and chlorosulfonic acid are added to dichloroethane and mixed uniformly, heated and stirred under nitrogen protection, the reaction liquid is neutralized, rotary evaporation is carried out, and sulfonated soybean lecithin is obtained; sulfonated soybean lecithin and ethylenediamine are added to anhydrous ethanol, then p-toluenesulfonic acid is added, and the reaction is stirred by heating and then distilled under reduced pressure to obtain modified soybean lecithin; step S2, SiO2 particles are dispersed in anhydrous ethanol, KH-550 is added, ultrasonic treatment is carried out, centrifugation is carried out, and the pretreated SiO2 particles are obtained by drying; the modified soybean lecithin is uniformly mixed with the pretreated SiO2 particles, added to a supercritical fluid reactor, heated and pressurized, ultrasonic dispersed, and the antistatic agent is obtained after drying. The application can achieve the purpose of good dispersibility, strong stability and strong antistatic ability of the antistatic agent.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of petroleum chemical industry, in particular to an antistatic agent for fuel oil and a preparation method thereof. BACKGROUND

[0002] Fuel oil (such as gasoline, diesel, kerosene, etc.) is mainly composed of hydrocarbon compounds, and its conductivity is extremely poor. In the process of storage, transportation and use, static electricity is easily accumulated due to friction with pipelines, containers, filter media, etc. If the accumulation of static electricity is too high, it may cause spark discharge, which poses a major safety hazard. Although the traditional fuel oil refining process can reduce the sulfur content, it also removes natural polar substances (such as sulfur-containing and nitrogen-containing compounds), further weakening the conductivity of fuel oil and exacerbating the risk of static electricity. At present, the conductivity of fuel oil is mainly improved by adding antistatic agents, but the existing technology has defects: first, most antistatic agents (such as linear quaternary ammonium salt and metal salt) have poor compatibility with fuel oil, which can easily precipitate crystals or affect the stability of oil products; second, the antistatic effect decays with storage time, making it difficult to maintain long-term conductivity; third, some antistatic agents contain heavy metals or phosphorus elements, which do not meet environmental protection requirements.

[0003] In the prior art, the design of antistatic agents is mostly limited to single function or structure. For example, although linear quaternary ammonium salt antistatic agents can neutralize charges through ion conduction, their binding force with fuel oil molecules is weak, they have poor water washing resistance, and they are easily decomposed and fail in high temperature or long-term storage. Although some composite antistatic agents improve performance by introducing nanomaterials, they still face problems such as uneven dispersion and weak interfacial bonding.

[0004] Therefore, it is necessary to provide an antistatic agent for fuel oil and a preparation method thereof to solve the problems existing in the prior art. SUMMARY

[0005] Therefore, the present application provides an antistatic agent for fuel oil and a preparation method thereof, which can achieve the purposes of good dispersion, strong stability and strong antistatic ability of the antistatic agent.

[0006] The specific scheme of the present application is as follows: a preparation method of an antistatic agent for fuel oil, comprising the following steps:

[0007] Step S1, preparation of modified soybean lecithin:

[0008] Soybean lecithin and chlorosulfonic acid are added to dichloroethane and mixed uniformly, heated and stirred under nitrogen protection, the reaction solution is neutralized, rotary evaporation is performed, and sulfonated soybean lecithin is obtained; the sulfonated soybean lecithin and ethylenediamine are added to anhydrous ethanol, and p-toluenesulfonic acid is added, heated and stirred, and reduced pressure distillation is performed to obtain modified soybean lecithin;

[0009] Step S2, preparation of the antistatic agent:

[0010] The SiO2 particles are dispersed in anhydrous ethanol, KH-550 is added, ultrasonic treatment, centrifugation, drying, to obtain pretreated SiO2 particles; the modified soy lecithin is mixed with the pretreated SiO2 particles, added to a supercritical fluid reactor, heated and pressurized, ultrasonic dispersion, rapid pressure relief, dried to obtain an antistatic agent.

[0011] Soy lecithin is a natural amphiphilic molecule, its polar head group phosphoric acid group and choline group can provide strong polar sites, can adsorb charged ions in fuel, its non-polar part has two long chain fatty acids, similar to the hydrocarbon structure of fuel oil, can realize spontaneous dispersion in fuel oil, reduce the surface tension of fuel oil, inhibit the accumulation of static charge, reduce the density of static charge, in addition, soy lecithin also has self-assembly characteristics, can form reverse micelles in fuel oil, capture charge carriers through the internal polar core, and the external hydrophobic layer of unsaturated fatty acid can scavenge free radicals, delay oxidation, avoid the exacerbation of static electricity caused by oxidation products.

[0012] By sulfonating soy lecithin, introducing sulfonic acid groups, and then amine modification by ethylenediamine, introducing amino groups, stronger polarity and ionic characteristics can be brought to soy lecithin, promoting ion migration, which helps to quickly neutralize the static charge generated by the flow friction of fuel oil, and improves the charge neutralization capacity.

[0013] By using supercritical fluid to composite modified soy lecithin and modified SiO2, the high shear force can break the SiO2 agglomerates, and high-efficiency dispersion of SiO2 nanoparticles can be realized. The supercritical fluid can reduce the glass transition temperature of the modified soy lecithin, promote the flexible movement of its molecular chain, coat the SiO2 nanoparticles to form a stable core-shell structure, so that the antistatic agent can maintain electrical conductivity at high temperature. And the SiO2 nanoparticles as inert core can inhibit the thermal motion of soy lecithin molecular chain, which helps to slow down the phenomenon of high temperature oxidation chain scission, and improves the thermal stability of the antistatic agent, while soy lecithin can avoid SiO2 agglomeration.

[0014] The mesoporous structure of the antistatic agent itself can be used as a fast channel for electron transfer, and the subsequent rapid pressure relief process can form micropores in the antistatic agent, which can temporarily store a part of the static charge, buffer the accumulation of static charge, and the two can further reduce the static effect in the fuel oil.

[0015] Preferably, in step S1, the ratio of soy lecithin to chlorosulfonic acid is 1:1.2; the ratio of sulfonated soy lecithin to ethylenediamine is 1:2.

[0016] Preferably, in step S1, the temperature of heating and stirring is 40-45℃, the speed is 300-400r / min, and the time is 2-4h.

[0017] Preferably, in the step S1, the neutralization uses 5-10wt% sodium bicarbonate solution.

[0018] Preferably, in the step S1, the temperature of the temperature-raised stirring is 60-70℃, the speed is 350-450r / min, and the time is 3-5h.

[0019] Preferably, in the step S2, the ratio of the modified soybean lecithin to the pretreated SiO2 particles is (3-5):1.

[0020] Preferably, in the step S2, the supercritical fluid is liquid CO2.

[0021] The supercritical fluid CO2 has high diffusivity, low viscosity, and strong solubility, and can pass through micro-jets and shock waves to strip the particle agglomerates and realize nanoscale dispersion.

[0022] Preferably, the flow rate of the liquid CO2 is 9-11L / min.

[0023] The mass transfer efficiency is enhanced, and local concentration unevenness is prevented.

[0024] Preferably, in the step S2, the temperature of the temperature-raised pressurization is 35-40℃, the pressure is 8-12MPa, and the time is 10-20min; the ultrasonic time is 20-30min.

[0025] To achieve the above object, the application further provides a fuel antistatic agent produced by the above-mentioned method for preparing a fuel antistatic agent, which comprises the following components in weight fractions:

[0026] The modified soybean lecithin 4-8 parts and the pretreated SiO2 particles 1-2 parts.

[0027] Preferably, the temperature-sensitive nanocapsule comprises the following raw materials in weight fractions:

[0028] The modified soybean lecithin comprises the following raw materials in weight fractions: soybean lecithin 15-20 parts, chlorosulfonic acid 18-24 parts, and ethylenediamine 24-30 parts.

[0029] The pretreated SiO2 particles comprise the following raw materials in weight fractions: SiO2 particles 2-4 parts and KH-550 0.5-1 part.

[0030] The antistatic agent prepared from the above-mentioned components has the optimal effect.

[0031] The above technical scheme of the application at least has the following beneficial effects:

[0032] (1) Soybean lecithin is a natural amphiphilic molecule, which can not only adsorb charged ions in fuel oil, but also realize spontaneous dispersion in fuel oil, reduce the surface tension of fuel oil, inhibit the accumulation of static charge, and reduce the density of static charge. In addition, it can also capture charge carriers through the internal polar core and scavenge free radicals through the external unsaturated fatty acid, thereby delaying the exacerbation of static electricity caused by oxidation.

[0033] (2) By sulfonating soybean lecithin, introducing sulfonic acid groups, and then aminating with ethylenediamine, introducing amino groups, the modified soybean lecithin has stronger polarity and ionic properties, which can promote ion migration and help the antistatic agent to quickly neutralize the static charge generated by the flow friction of fuel oil, thereby improving the charge neutralization ability.

[0034] (3) By using supercritical fluid to compound the modified soybean lecithin and modified SiO2, the high-efficiency dispersion of SiO2 nanoparticles can be realized, and the supercritical fluid can reduce the glass transition temperature of the modified soybean lecithin, thereby realizing the coating of SiO2 nanoparticles to form a stable core-shell structure. At the same time, the SiO2 nanoparticles can inhibit the thermal motion of the molecular chain of soybean lecithin, thereby improving the thermal stability of the antistatic agent. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the embodiments of the present application. The described embodiments are part of the embodiments of the present application, and all other embodiments obtained by those skilled in the art based on the described embodiments of the present application belong to the scope of protection of the present application.

[0036] Embodiment 1

[0037] 15 parts of soybean lecithin and 18 parts of chlorosulfonic acid were mixed uniformly in dichloroethane, heated to 45°C under nitrogen protection, and stirred at a speed of 350 r / min. The reaction time was 3 h. After the reaction was completed, 5-10 wt% of sodium bicarbonate solution was added to neutralize the reaction liquid to pH 6-7. Rotary evaporation and vacuum drying were performed to obtain sulfonated soybean lecithin. 12 parts of sulfonated lecithin and 24 parts of ethylenediamine were added to anhydrous ethanol, and p-toluenesulfonic acid was added as a catalyst. The mixture was heated to 65°C and stirred at a speed of 400 r / min for 4 h. Ethanol was recovered by reduced pressure distillation, washed with ether three times, and dried at 60°C under vacuum to obtain modified soybean lecithin.

[0038] Preparation of the antistatic agent: 2 parts of SiO2 particles were dispersed in anhydrous ethanol, 0.5 parts of KH-550 were added, ultrasonic treatment was performed at 60°C, centrifugation was performed, and drying was performed to obtain pretreated SiO2 particles; 4 parts of modified soybean lecithin and 1 part of SiO2 particles were uniformly mixed at a ratio of 4:1, were added to a supercritical fluid reactor, liquid CO2 was injected at a speed of 10 L / min, the temperature was increased to 40°C, and the pressure was increased to 10 MPa, reaction was performed for 10 min, ultrasonic dispersion was performed for 30 min, rapid pressure relief was performed, vacuum drying was performed, and sieving was performed to obtain the antistatic agent.

[0039] Example 2

[0040] Preparation of the antistatic agent: 2 parts of SiO2 particles were dispersed in anhydrous ethanol, 0.5 parts of KH-550 were added, ultrasonic treatment was performed at 60°C, centrifugation was performed, and drying was performed to obtain pretreated SiO2 particles; 4 parts of modified soybean lecithin and 1 part of SiO2 particles were uniformly mixed at a ratio of 4:1, were added to a supercritical fluid reactor, liquid CO2 was injected at a speed of 10 L / min, the temperature was increased to 40°C, and the pressure was increased to 10 MPa, reaction was performed for 10 min, ultrasonic dispersion was performed for 30 min, rapid pressure relief was performed, vacuum drying was performed, and sieving was performed to obtain the antistatic agent.

[0041] Preparation of the antistatic agent: 2 parts of SiO2 particles were dispersed in anhydrous ethanol, 0.5 parts of KH-550 were added, ultrasonic treatment was performed at 60°C, centrifugation was performed, and drying was performed to obtain pretreated SiO2 particles; 4 parts of modified soybean lecithin and 1 part of SiO2 particles were uniformly mixed at a ratio of 4:1, were added to a supercritical fluid reactor, liquid CO2 was injected at a speed of 10 L / min, the temperature was increased to 40°C, and the pressure was increased to 10 MPa, reaction was performed for 10 min, ultrasonic dispersion was performed for 30 min, rapid pressure relief was performed, vacuum drying was performed, and sieving was performed to obtain the antistatic agent.

[0042] Example 3

[0043] Preparation of the antistatic agent: 2 parts of SiO2 particles were dispersed in anhydrous ethanol, 0.5 parts of KH-550 were added, ultrasonic treatment was performed at 60°C, centrifugation was performed, and drying was performed to obtain pretreated SiO2 particles; 4 parts of modified soybean lecithin and 1 part of SiO2 particles were uniformly mixed at a ratio of 4:1, were added to a supercritical fluid reactor, liquid CO2 was injected at a speed of 10 L / min, the temperature was increased to 40°C, and the pressure was increased to 10 MPa, reaction was performed for 10 min, ultrasonic dispersion was performed for 30 min, rapid pressure relief was performed, vacuum drying was performed, and sieving was performed to obtain the antistatic agent.

[0044] Preparation of the antistatic agent: 4 parts of SiO2 particles were dispersed in anhydrous ethanol, 1 part of KH-550 was added, ultrasonic treatment was carried out at 60°C, centrifugation was carried out, and drying was carried out to obtain pretreated SiO2 particles; 6 parts of modified soybean lecithin and 1.5 parts of SiO2 particles were uniformly mixed at a ratio of 4:1, were added to a supercritical fluid reactor, liquid CO2 was injected at a speed of 11 L / min, the temperature was raised to 40°C, and the pressure was raised to 8 MPa, reaction was carried out for 20 min, ultrasonic dispersion was carried out for 25 min, rapid pressure relief was carried out, vacuum drying was carried out, and sieving was carried out to obtain the antistatic agent.

[0045] Example 4

[0046] Preparation of the antistatic agent: 4 parts of SiO2 particles were dispersed in anhydrous ethanol, 1 part of KH-550 was added, ultrasonic treatment was carried out at 60°C, centrifugation was carried out, and drying was carried out to obtain pretreated SiO2 particles; 6 parts of modified soybean lecithin and 1.5 parts of SiO2 particles were uniformly mixed at a ratio of 4:1, were added to a supercritical fluid reactor, liquid CO2 was injected at a speed of 11 L / min, the temperature was raised to 40°C, and the pressure was raised to 8 MPa, reaction was carried out for 20 min, ultrasonic dispersion was carried out for 25 min, rapid pressure relief was carried out, vacuum drying was carried out, and sieving was carried out to obtain the antistatic agent.

[0047] Preparation of the antistatic agent: 4 parts of SiO2 particles were dispersed in anhydrous ethanol, 1 part of KH-550 was added, ultrasonic treatment was carried out at 60°C, centrifugation was carried out, and drying was carried out to obtain pretreated SiO2 particles; 6 parts of modified soybean lecithin and 1.5 parts of SiO2 particles were uniformly mixed at a ratio of 4:1, were added to a supercritical fluid reactor, liquid CO2 was injected at a speed of 11 L / min, the temperature was raised to 40°C, and the pressure was raised to 8 MPa, reaction was carried out for 20 min, ultrasonic dispersion was carried out for 25 min, rapid pressure relief was carried out, vacuum drying was carried out, and sieving was carried out to obtain the antistatic agent.

[0048] Example 5

[0049] Preparation of the antistatic agent: 4 parts of SiO2 particles were dispersed in anhydrous ethanol, 1 part of KH-550 was added, ultrasonic treatment was carried out at 60°C, centrifugation was carried out, and drying was carried out to obtain pretreated SiO2 particles; 6 parts of modified soybean lecithin and 1.5 parts of SiO2 particles were uniformly mixed at a ratio of 4:1, were added to a supercritical fluid reactor, liquid CO2 was injected at a speed of 11 L / min, the temperature was raised to 40°C, and the pressure was raised to 8 MPa, reaction was carried out for 20 min, ultrasonic dispersion was carried out for 25 min, rapid pressure relief was carried out, vacuum drying was carried out, and sieving was carried out to obtain the antistatic agent.

[0050] Preparation of the antistatic agent: 2 parts of SiO2 particles were dispersed in anhydrous ethanol, 0.5 parts of KH-550 were added, ultrasonic treatment was performed at 60°C, centrifugation was performed, and drying was performed to obtain pretreated SiO2 particles; 4 parts of modified soybean lecithin and 1 part of SiO2 particles were uniformly mixed at a ratio of 4:1, were added to a supercritical fluid reactor, liquid CO2 was injected at a speed of 10 L / min, the temperature was increased to 40°C, and the pressure was increased to 10 MPa, reaction was performed for 10 min, ultrasonic dispersion was performed for 30 min, rapid pressure relief was performed, vacuum drying was performed, and sieving was performed to obtain the antistatic agent.

[0051] Example 6

[0052] Preparation of the antistatic agent: 2 parts of SiO2 particles were dispersed in anhydrous ethanol, 0.5 parts of KH-550 were added, ultrasonic treatment was performed at 60°C, centrifugation was performed, and drying was performed to obtain pretreated SiO2 particles; 4 parts of modified soybean lecithin and 1 part of SiO2 particles were uniformly mixed at a ratio of 4:1, were added to a supercritical fluid reactor, liquid CO2 was injected at a speed of 10 L / min, the temperature was increased to 40°C, and the pressure was increased to 10 MPa, reaction was performed for 10 min, ultrasonic dispersion was performed for 30 min, rapid pressure relief was performed, vacuum drying was performed, and sieving was performed to obtain the antistatic agent.

[0053] Preparation of the antistatic agent: 2 parts of SiO2 particles were dispersed in anhydrous ethanol, 0.5 parts of KH-550 were added, ultrasonic treatment was performed at 60°C, centrifugation was performed, and drying was performed to obtain pretreated SiO2 particles; 4 parts of modified soybean lecithin and 1 part of SiO2 particles were uniformly mixed at a ratio of 4:1, were added to a supercritical fluid reactor, liquid CO2 was injected at a speed of 10 L / min, the temperature was increased to 40°C, and the pressure was increased to 10 MPa, reaction was performed for 10 min, ultrasonic dispersion was performed for 30 min, rapid pressure relief was performed, vacuum drying was performed, and sieving was performed to obtain the antistatic agent.

[0054] Example 7

[0055] Preparation of the antistatic agent: 2 parts of SiO2 particles were dispersed in anhydrous ethanol, 0.5 parts of KH-550 were added, ultrasonic treatment was performed at 60°C, centrifugation was performed, and drying was performed to obtain pretreated SiO2 particles; 4 parts of modified soybean lecithin and 1 part of SiO2 particles were uniformly mixed at a ratio of 4:1, were added to a supercritical fluid reactor, liquid CO2 was injected at a speed of 10 L / min, the temperature was increased to 40°C, and the pressure was increased to 10 MPa, reaction was performed for 10 min, ultrasonic dispersion was performed for 30 min, rapid pressure relief was performed, vacuum drying was performed, and sieving was performed to obtain the antistatic agent.

[0056] Disperse 2 parts of SiO2 particles in anhydrous ethanol, add 1 part of KH-550, ultrasonic treatment at 60℃, centrifugal, dry, and obtain pretreated SiO2 particles; mix 6 parts of modified soybean lecithin and 1.5 parts of SiO2 particles uniformly at a ratio of 4:1, add to a supercritical fluid reactor, inject liquid CO2 at a speed of 11L / min, heat to 40℃, and pressurize to 9MPa, react for 15min, then ultrasonic disperse for 25min, fast pressure relief, vacuum drying, and sieve to obtain the antistatic agent.

[0057] Example 8

[0058] Mix 15 parts of soybean lecithin and 18 parts of chlorosulfonic acid in dichloroethane, heat to 40℃ under nitrogen protection, start stirring at a speed of 400r / min, and react for 2h; after the reaction is completed, add 5-10wt% of sodium bicarbonate solution to neutralize the reaction liquid to pH 6-7, rotary evaporate, and vacuum dry to obtain sulfonated soybean lecithin; add 12-15 parts of the sulfonated lecithin and 24-30 parts of ethylenediamine to anhydrous ethanol, add p-toluenesulfonic acid as a catalyst, heat to 70℃, stir at a speed of 450r / min, and react for 3h; recover ethanol by distillation under reduced pressure, wash with ether three times, and vacuum dry at 60℃ to obtain modified soybean lecithin.

[0059] Disperse 4 parts of SiO2 particles in anhydrous ethanol, add 0.5 parts of KH-550, ultrasonic treatment at 60℃, centrifugal, dry, and obtain pretreated SiO2 particles; mix 4 parts of modified soybean lecithin and 1 part of SiO2 particles uniformly at a ratio of 4:1, add to a supercritical fluid reactor, inject liquid CO2 at a speed of 10L / min, heat to 40℃, and pressurize to 10MPa, react for 10min, then ultrasonic disperse for 30min, fast pressure relief, vacuum drying, and sieve to obtain the antistatic agent.

[0060] The present application also carries out comparative examples and related tests.

[0061] Comparative Example 1

[0062] Comparative Example 1 is different from Example 1 in that the soybean lecithin is not subjected to sulfonation operation, and other components and preparation methods are the same as those of Example 1, and the antistatic agent is prepared.

[0063] Comparative Example 2

[0064] Comparative Example 2 is different from Example 1 in that the soybean lecithin is not subjected to amination operation, and other components and preparation methods are the same as those of Example 1, and the antistatic agent is prepared.

[0065] Comparative Example 3

[0066] Comparative Example 3 is different from Example 1 in that the supercritical fluid treatment is not used, but the modified soy lecithin and the pretreated SiO2 particles are directly mixed, and the other compositions and preparation methods are the same as those of Example 1, to prepare the antistatic agent.

[0067] Performance test

[0068] The antistatic agents prepared in Examples 1-8 and Comparative Examples 1-3 are subjected to performance tests, and the test standards are GB / T6539-1997, and the test results are shown in Table 1.

[0069] Table 1

[0070]

[0071] As can be seen from the data in Table 1, compared with Example 1, Comparative Example 1 does not perform sulfonation on the soy lecithin, and the conductivity is obviously decreased, and the charge decay time is increased, indicating that the sulfonic acid group is beneficial to enhancing the charge neutralization ability of the antistatic agent; compared with Example 1, Comparative Example 2 does not further aminate the sulfonated soy lecithin, and the conductivity of the antistatic agent is reduced, indicating that the introduction of the amino group can increase the ionic characteristics of the soy lecithin and promote the improvement of the charge neutralization ability of the antistatic agent; compared with Example 1, Comparative Example 3 has insufficient antistatic performance, indicating that the treatment of the supercritical fluid can promote the formation of mesoporous and microporous structures of the antistatic agent and promote the improvement of the action efficiency of the antistatic agent.

[0072] The antistatic agents prepared in Examples 1-8 and Comparative Examples 1-3 are subjected to dispersibility and stability tests, and the thermal stability of the antistatic agent is tested at 120℃ for 24h, and the results are shown in Table 2.

[0073] Table 2

[0074]

[0075] As can be seen from the above Table 2, the antistatic agents obtained in Examples 1-8 have stable performance, and the thermal stability and dispersibility of Comparative Example 3 are obviously decreased, indicating that the formation of the core-shell structure by the supercritical fluid treatment is helpful to improving the thermal stability of the antistatic agent, and can also avoid agglomeration and promote better dispersion of the antistatic agent.

[0076] The above is the preferred embodiment of the present application, and those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method for preparing an antistatic agent for fuel oil, characterized in that, The method comprises the following steps: Step S1, preparation of modified soybean lecithin: Mix soybean lecithin and chlorosulfonic acid in dichloroethane, and then perform heating and stirring under nitrogen protection. Neutralize the reaction solution, and perform rotary evaporation to obtain sulfonated soybean lecithin. Then, mix the sulfonated soybean lecithin and ethylenediamine in anhydrous ethanol, and then add p-toluenesulfonic acid. Perform heating and stirring, and then perform vacuum distillation to obtain modified soybean lecithin. Step S2, preparation of an antistatic agent: Disperse SiO2 particles in anhydrous ethanol, and then add KH-550. Perform ultrasonic treatment, centrifugation, and drying to obtain pretreated SiO2 particles. Mix the modified soybean lecithin and the pretreated SiO2 particles, and then add them to a supercritical fluid reactor. Perform heating and pressurization, and then perform ultrasonic dispersion. After drying, an antistatic agent is obtained.

2. The method for preparing an antistatic agent for fuel according to claim 1, characterized in that, In the step S1, the ratio of soybean lecithin to chlorosulfonic acid is 1:1.2, and the ratio of sulfonated soybean lecithin to ethylenediamine is 1:

2.

3. The method for preparing an antistatic agent for fuel according to claim 1, characterized in that, In the step S1, the temperature of heating and stirring is 40-45℃, the speed is 300-400r / min, and the time is 2-4h.

4. The method for preparing an antistatic agent for fuel according to claim 1, characterized in that, In the step S1, a 5-10%wt sodium bicarbonate solution is used for neutralization.

5. The method for preparing an antistatic agent for fuel according to claim 4, characterized in that, In the step S1, the temperature of heating and stirring is 60-70℃, the speed is 350-450r / min, and the time is 3-5h.

6. The method of claim 1, wherein the fuel antistatic agent is prepared by the steps of: In the step S2, the ratio of modified soybean lecithin to pretreated SiO2 particles is (3-5):

1.

7. The method for preparing an antistatic agent for fuel according to claim 1, characterized in that, In the step S2, the supercritical fluid is CO2, and the flow rate of CO2 is 9-11L / min.

8. The method for preparing an antistatic agent for fuel according to claim 1, characterized in that, In the step S2, the temperature of heating and pressurization is 35-40℃, the pressure is 8-12MPa, the time is 10-20min, and the ultrasonic time is 20-30min.

9. An antistatic agent for fuel, characterized in that, The method for preparing an antistatic agent for fuel oil is produced by any one of claims 1-8, comprising the following components by weight fraction: Modified soybean lecithin 4-8 parts and pretreated SiO2 particles 1-2 parts.

10. The fuel antistatic agent according to claim 9, wherein The modified soybean lecithin comprises the following raw materials by weight fraction: soybean lecithin 15-20 parts, chlorosulfonic acid 18-24 parts, and ethylenediamine 24-30 parts. The pretreated SiO2 particles comprise the following raw materials by weight fraction: SiO2 particles 2-4 parts and KH-550 0.5-1 part.

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