Preparation method of gasoline blender

Abstract

The invention relates to the field of fuel additives, in particular to a preparation method of a gasoline blender, which comprises the following steps: weighing the weight of each component, firstly dispersing an amine gasoline detergent, then adding polyoxymethylene dimethyl ether, then adding a dehydrating agent, and finally introducing a passivating agent. On the basis of the components, the gasoline blender is prepared by optimizing the process of adding the components, so that carbon deposits in a low-temperature area and a high-temperature area of an engine are synchronously reduced, and the problems of low-temperature deposits and high-temperature carbon deposits are synchronously solved.

Description

Technical Field

[0001] The present invention relates to the field of fuel additives, and in particular to a method for preparing a gasoline blending agent. Background Art

[0002] With the rapid development of the automotive industry and increasingly stringent environmental protection requirements, engine carbon deposits have become a significant factor affecting vehicle performance, fuel economy, and emissions. Engine carbon deposits primarily form in key areas such as the intake valve, fuel injector, and combustion chamber. They can not only reduce engine power and increase fuel consumption, but can also cause a range of issues, including unstable idling, weak acceleration, and excessive exhaust emissions.

[0003] Currently, gasoline detergents are widely used in the automotive fuel additive field as a primary technical solution to engine carbon deposits. In the prior art, polymer detergents such as polyetheramines and polyisobutyleneamines have become core components of gasoline detergents due to their excellent cleaning properties. CN103571549B discloses a gasoline detergent containing a polyetheramine, an octane improver, and an alkane solvent oil. This detergent can effectively remove carbon deposits from engine injectors, combustion chambers, and intake valves, improving fuel economy.

[0004] In order to improve the cleaning effect, some technical solutions have adopted a strategy of multi-component synergistic action. CN110257114A discloses a multi-effect gasoline detergent, which achieves the removal and inhibition of combustion chamber carbon deposits through the combination of multiple functional components such as carbon deposit removal inhibitors, octane improvers and power enhancers. CN111635793A introduces a cleaning type gasoline detergent, in which the combination of polyetheramine and polyisobutyleneamine can not only inhibit and clean carbon deposits in various parts of the engine, but also improve the thermal efficiency of fuel. CN109280569A proposes a highly concentrated gasoline detergent containing polyetheramine and polyisobutyleneamine, which can remove nozzle deposits and intake valve deposits, and reduce the formation of combustion chamber deposits. However, its essence is a simple mixture of various components, and the characteristics of each component are not taken into account. There is room for further improvement in performance. The molecular compatibility between the functional components is poor, which makes it difficult to coordinate the removal of low-temperature deposits and the inhibition of high-temperature carbon deposits. In addition, CN105695007B proposes a gasoline detergent containing a friction modifier, which adds a lubricating function on the basis of cleaning performance, further improving fuel economy.

[0005] However, in existing compounding strategies, the molecular compatibility between the functional components is poor, which makes it difficult to coordinate the removal of low-temperature deposits and the inhibition of high-temperature carbon deposition. The negative interactions between the components even make the actual effect of the composite product lower than the simple addition of the performance of each single agent. In existing technical solutions, many products are simply mixed and prepared without considering the impact of the preparation process on the performance, which makes the potential between the components unable to be fully released. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides a gasoline blending agent. Based on the components, by optimizing the process of adding each component, a gasoline blending agent is prepared, which can achieve the simultaneous reduction of carbon deposits in the low-temperature and high-temperature zones of the engine, and simultaneously solve the problems of low-temperature deposits and high-temperature carbon deposits.

[0007] The technical solution adopted by the present invention to solve the technical problem is: to provide a method for preparing a gasoline blending agent, comprising the following steps: Step (a): adding 50-85 parts of an aromatic hydrocarbon solvent carrier by weight to a stirred kettle, stirring continuously at room temperature and pressure under protective gas, then adding 0.5-3 parts of an amine gasoline detergent at a rate of 0.5-1.0% / min based on the weight of the amine gasoline detergent. After the addition is completed, stirring continuously for 5-10 minutes, and then adding 2-10 parts of an oxygen-containing combustion accelerator, controlling the single addition time to be ≥10 minutes, to obtain a main phase; Step (b): After the main phase is stirred for 5-10 minutes, 5-20 parts of a dehydrating agent are added below the liquid level of the main phase at a rate of 0.05-0.1% of the total volume / min. After the addition is complete, 0.1-1 parts of a metal passivating agent are added to obtain a crude product; Step (c): the crude product is stirred at 200-400 rpm for 30-60 min to obtain a gasoline blending agent.

[0008] Preferably, the amine gasoline detergent is a combination of polyisobutylene amine and polyether amine in a weight ratio of 1:1-2; the oxygen-containing combustion promoter is polymethoxydimethyl ether, and its polymerization degree n is 2-5; the aromatic hydrocarbon solvent carrier is one or more of benzene, toluene, xylene or C9-C10 heavy aromatic hydrocarbons; and the dehydrating agent is one of anhydrous ethanol, isopropyl alcohol or tert-butanol.

[0009] As a gasoline detergent, polyisobutylene amine (PIBA) possesses excellent cleaning capabilities, effectively removing low-temperature deposits from engine intake valves and fuel injectors. Polyoxymethylene dimethyl ether (PMDE), an oxygenated combustion promoter, increases the oxygen content of the fuel, promoting more complete combustion and reducing the formation of high-temperature carbon deposits. These two core functional components work synergistically to simultaneously inhibit the formation of low-temperature deposits on engine intake valves and fuel injectors, as well as high-temperature carbon deposits in the combustion chamber.

[0010] Aromatic hydrocarbon solvent carriers effectively dissolve the functional components, ensuring product stability and uniformity. Anhydrous ethanol, as a dehydrating agent, absorbs moisture from the fuel system, improving the fuel's anti-knock properties. Organic amine passivators form stable complexes with metal ions, preventing metal-catalyzed oxidation reactions and extending the product's shelf life.

[0011] This solution utilizes a polyoxymethylene dimethyl ether with a degree of polymerization (dp) of n=2-5, which not only avoids the high volatility loss of low-dp components (n=1) but also mitigates the risk of carbon deposition caused by incomplete combustion of high-dp components (n>5). Through innovative component design and compatibility mechanisms, the negative interactions caused by poor molecular compatibility between components in traditional compounding solutions are resolved, resulting in a composite blend that delivers a superior overall performance compared to the simple addition of individual components.

[0012] In this scheme, normal temperature refers to around 25°C, and normal pressure refers to around one atmosphere. In order to achieve the synergistic carbon reduction effect of polyoxymethylene dimethyl ether and polyetheramine detergent in gasoline blending agents, the preparation method must strictly follow the steps of first dispersing the amine gasoline detergent, then adding polyoxymethylene dimethyl ether, then adding a dehydrating agent, and finally introducing a passivating agent: This is because the polyoxymethylene dimethyl ether molecule with n=2-5 has a strong polar ether bond structure and medium viscosity. If an aromatic hydrocarbon carrier is added before the amine gasoline detergent, the polyetheramine in the amine gasoline detergent will precipitate and lose its low-temperature detergency due to the conflict of solvent polarity; and the terminal methoxyl group (- OCH3) is highly sensitive to hydrolysis. This is because: the polarity of the CO bond leads to positive carbon charge, which is susceptible to nucleophilic attack, and the terminal position has no steric protection. Therefore, the hydrolysis of n=2-5 is faster than that of the longer chain, and the hydrolysis generates methanol / formaldehyde, which will destroy the oxygen-containing function of the molecule. If it is introduced after the dehydrating agent (such as anhydrous ethanol containing a trace amount of water) is added, it will trigger the hydrolysis and chain breakage of polyoxyethylene dimethyl ether to generate formaldehyde / methanol, resulting in oxygen loss and failure of high-temperature carbon deposition inhibition; In essence, the dehydrating agent described in this scheme plays the role of capturing water molecules. Since anhydrous ethanol and other dehydrating agents inevitably contain 0.2% water, if it is first Adding it to the system is equivalent to adding water to the original system, making the process of adding the oxygen-containing combustion accelerator become a small amount of oxygen-containing combustion accelerator encountering "a large amount of water" (similar to the water entering the acid during the dilution of concentrated sulfuric acid), and the hydrolysis is fast. However, on the contrary, adding the oxygen-containing combustion accelerator first and then adding the dehydrating agent at a controlled rate is equivalent to encountering only a small amount of water. After a small amount of water, the concentration of the dehydrating agent in the system is sufficient to compete with the oxygen-containing combustion accelerator for water, and the hydrolysis reaction is terminated (similar to the acid entering the water during the dilution of concentrated sulfuric acid); further, in order to prevent the uneven dispersion of the dehydrating agent due to density differences, this solution is adopted. Slowly inject it through a pipeline below the system liquid level, preferably at the 1 / 3-2 / 3 level. The total system volume refers to the total volume of the added components. If the metal passivator is added before the polyoxymethylene dimethyl ether, the metal ions released by its chelating components will catalyze the oxidation and gelation of the polyoxymethylene dimethyl ether, not only clogging the injector nozzles and exacerbating low-temperature deposits, but also destroying the hydrogen bond network between the polyetheramine and polyoxymethylene dimethyl ether molecules. This core structure is the synergistic foundation for the simultaneous removal of high- and low-temperature carbon deposits. The polyetheramine adsorbs the metal surface to disperse the colloid, and the polyoxymethylene dimethyl ether embeds between its hydrophobic chains to release reactive oxygen free radicals and optimize combustion. Therefore, any reversal of the order of the steps will irreversibly disrupt the molecular compatibility mechanism, causing the high-temperature carbon reduction advantage of the n=2-5 polyoxymethylene dimethyl ether and the low-temperature detergency of the polyetheramine to degrade from synergistic to offsetting their effects. Therefore, this process sequence is a necessary technical condition for achieving global carbon deposit suppression.

[0013] Preferably, the protective gas in step (a) is dry nitrogen, with an oxygen volume ratio of ≤0.01% and a water vapor content of ≤0.01%.

[0014] Preferably, the stirring rate of the continuous stirring in step (a) is 200-400 rpm.

[0015] Preferably, in step (b), 5-20 parts of dehydrating agent are added below the main phase liquid level at a rate of 0.05-0.1% / min of the total volume, specifically, 5-20 parts of dehydrating agent are added at a level 1 / 3-2 / 3 below the main phase liquid level.

[0016] Preferably, 0.001% by weight of triethylamine is added to the dehydrating agent to further control the hydrolysis.

[0017] This solution also provides a gasoline blending agent prepared by the above preparation method.

[0018] The present invention also provides the use of the gasoline blending agent prepared by the above preparation method in gasoline fuel, which is added to base gasoline at a ratio of 0.1-1wt% to simultaneously reduce carbon deposits on intake valves, fuel injectors and combustion chambers.

[0019] The beneficial effects of the present invention are: 1. Components: Through the synergistic effect of specific components, this product simultaneously reduces colloidal sludge deposits in low-temperature engine areas, such as intake valves and fuel injectors, and soot deposits in high-temperature areas, such as the combustion chamber and piston tops, overcoming the limitations of single components in existing technologies. When added to base gasoline at a ratio of 0.1-1wt%, this gasoline blending agent effectively reduces carbon deposits throughout the engine, improving engine performance.

[0020] 2. In the preparation process, there are strict requirements on the order and rate of material addition, which depends on the characteristics of the material components. A reasonable order and rate of addition can achieve the simultaneous reduction of carbon deposits in the low-temperature and high-temperature areas of the engine to the greatest extent, and can simultaneously solve the problems of low-temperature deposits and high-temperature carbon deposits. The components have good compatibility and high stability. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Overall embodiment A method for preparing a gasoline blending agent comprises the following steps: Step (a): adding 50-85 parts by weight of an aromatic hydrocarbon solvent carrier to a stirred kettle, stirring continuously at 200-400 rpm under a protective gas at a room temperature of 25° C. and a pressure of 1 atmosphere, then adding 0.5-3 parts of an amine gasoline detergent at a rate of 0.5-1.0% / min based on the weight of the amine gasoline detergent. After the addition is completed, stirring is continued, and after an interval of 5-10 minutes, 2-10 parts of an oxygen-containing combustion accelerator are added, with the single addition time being controlled to be ≥10 minutes, to obtain a main phase; The shielding gas is dry nitrogen, with an oxygen volume ratio of 0.008% and a water vapor content of 0.005%; The aromatic hydrocarbon solvent carrier is one or more of benzene, toluene, xylene or C9-C10 heavy aromatic hydrocarbons; the amine gasoline detergent is a combination of polyisobutylene amine and polyether amine in a weight ratio of 1:1-2; the oxygen-containing combustion promoter is polyoxyethylene dimethyl ether, and its polymerization degree n is 2-5; Step (b): After the main phase is stirred for 5-10 minutes, 5-20 parts of a dehydrating agent is added at a rate of 0.05-0.1% / min of the total volume at a level 1 / 3-2 / 3 below the main phase liquid level, and after the addition is complete, 0.1-1 parts of a metal passivator is added to obtain a crude product; the metal passivator is a salicylaldimine metal passivator, specifically 3,5-di-tert-butyl salicylaldimine; The dehydrating agent is one of anhydrous ethanol, isopropyl alcohol or tert-butyl alcohol; the dehydrating agent is added with 0.001% triethylamine by weight of the dehydrating agent; Step (c): the crude product is stirred at 200-400 rpm for 30-60 min to obtain a gasoline blending agent.

[0023] Example 1 A method for preparing a gasoline blending agent comprises the following steps: Step (a): adding 85 parts by weight of toluene to a stirred kettle, stirring continuously at 200 rpm under dry nitrogen with an oxygen volume ratio of 0.008% and a water vapor content of 0.005% at room temperature and pressure, then adding 0.5 parts of an amine gasoline detergent at a rate of 0.5% / min based on the weight of the amine gasoline detergent. After the addition is completed, stirring is continued, and after a 5-minute interval, 2 parts of polyoxyethylene dimethyl ether with a polymerization degree n of 2 are added, with the single addition time controlled to be 10 minutes, to obtain a main phase; The amine gasoline detergent is a combination of polyisobutylene amine and polyether amine in a weight ratio of 1:1; Step (b): After the main phase is stirred for 5 minutes, 5 parts of anhydrous ethanol are added at a rate of 0.075% / min of the total volume to a position 1 / 2 below the liquid level of the main phase. After the addition is complete, 0.1 parts of a salicylaldimine metal passivator are added to obtain a crude product; 0.001% triethylamine by weight of the anhydrous ethanol is added to the anhydrous ethanol; Step (c): The crude product was stirred at 200 rpm for 60 min to obtain a gasoline blending agent.

[0024] Example 2 A method for preparing a gasoline blending agent comprises the following steps: Step (a): adding 70 parts by weight of xylene to a stirred kettle, stirring continuously at 300 rpm under a protective gas at a room temperature of 25° C. and a pressure of 1 atmosphere, then adding 1.5 parts of an amine gasoline detergent at a rate of 0.8% by weight of the amine gasoline detergent per minute. After the addition is completed, stirring is continued for 7 minutes, and then 5 parts of polyoxyethylene dimethyl ether (n=3) are added, with the single addition time controlled to be 12 minutes, to obtain a main phase; The shielding gas is dry nitrogen, with an oxygen volume ratio of 0.008% and a water vapor content of 0.005%; The amine gasoline detergent is a combination of polyisobutylene amine and polyether amine in a weight ratio of 1:1.5; Step (b): After the main phase is stirred for 8 minutes, 10 parts of isopropyl alcohol is added at a rate of 0.1% of the total volume / min to a level 1 / 3 below the main phase liquid level. After the addition is complete, 0.5 parts of a salicylaldehyde imine metal passivator is added to obtain a crude product; Triethylamine is added to isopropyl alcohol at 0.001% by weight of isopropyl alcohol; Step (c): The crude product was stirred at 300 rpm for 45 minutes to obtain a gasoline blending agent.

[0025] Example 3 A method for preparing a gasoline blending agent comprises the following steps: Step (a): adding 55 parts by weight of C9 heavy aromatic hydrocarbons to a stirred kettle, stirring continuously at 350 rpm under a protective gas at a room temperature of 25°C and a pressure of 1 atmosphere, then adding 3 parts of an amine gasoline detergent at a rate of 1.0% by weight of the amine gasoline detergent per minute. After the addition is completed, stirring is continued, and then 8 parts of polyoxyethylene dimethyl ether (n=4) are added after a 10 minute interval, with the single addition time controlled to be 15 minutes, to obtain a main phase; The shielding gas is dry nitrogen, with an oxygen volume ratio of 0.008% and a water vapor content of 0.005%; The amine gasoline detergent is a combination of polyisobutylene amine and polyether amine in a weight ratio of 1:1; Step (b): After the main phase is stirred for 10 minutes, 15 parts of tert-butyl alcohol is added at a rate of 0.05% / min of the total volume to a position 1 / 2 below the liquid level of the main phase. After the addition is complete, 0.8 parts of a salicylaldimine metal passivator is added to obtain a crude product; Triethylamine is added to tert-butanol at 0.001% by weight of tert-butanol; Step (c): The crude product was stirred at 350 rpm for 30 min to obtain a gasoline blending agent.

[0026] Example 4 A method for preparing a gasoline blending agent comprises the following steps: Step (a): adding 50 parts by weight of benzene and toluene in a mass ratio of 1:1 to a stirred tank, stirring continuously at 400 rpm under a protective gas at a room temperature of 25° C. and a pressure of 1 atmosphere, then adding 2 parts of an amine gasoline detergent at a rate of 0.6% by weight of the amine gasoline detergent per minute. After the addition is completed, stirring is continued for 8 minutes, and then 10 parts of polyoxyethylene dimethyl ether (n=5) is added, with the single addition time controlled to 11 minutes, to obtain a main phase; The shielding gas is dry nitrogen, with an oxygen volume ratio of 0.008% and a water vapor content of 0.005%; The amine gasoline detergent is a combination of polyisobutylene amine and polyether amine in a weight ratio of 1:2; Step (b): After the main phase is stirred for 5 minutes, 20 parts of anhydrous ethanol is added at a rate of 0.075% of the total volume / min to a position 1 / 2 below the main phase liquid level. After the addition is complete, 1 part of a salicylaldimine metal passivator is added to obtain a crude product; Anhydrous ethanol is added with 0.001% triethylamine by weight of anhydrous ethanol; Step (c): The crude product was stirred at 400 rpm for 50 min to obtain a gasoline blending agent.

[0027] Example 5 A method for preparing a gasoline blending agent comprises the following steps: Step (a): adding 80 parts by weight of xylene to a stirred tank, stirring continuously at 250 rpm under a protective gas at a room temperature of 25° C. and a pressure of 1 atmosphere, then adding 1 part of an amine gasoline detergent at a rate of 0.7% by weight of the amine gasoline detergent per minute. After the addition is completed, stirring is continued for 6 minutes, and then 3 parts of polyoxyethylene dimethyl ether (n=2) are added, with the single addition time controlled to be 13 minutes, to obtain a main phase; The shielding gas is dry nitrogen, with an oxygen volume ratio of 0.008% and a water vapor content of 0.005%; The amine gasoline detergent is a combination of polyisobutylene amine and polyether amine in a weight ratio of 1:2; Step (b): After the main phase is stirred for 5-10 minutes, 12 parts of tert-butyl alcohol is added at a rate of 0.075% / min of the total volume to a position 2 / 3 below the liquid level of the main phase. After the addition is complete, 0.3 parts of a salicylaldimine metal passivator is added to obtain a crude product; Triethylamine is added to tert-butanol at 0.001% by weight of tert-butanol; Step (c): The crude product was stirred at 250 rpm for 40 min to obtain a gasoline blending agent.

[0028] Comparative Example 1 The difference from Example 1 is that only the raw material component ratio is different: Step (a) Prepare the raw materials: weigh the following according to the mass ratio: Amine gasoline detergent: 1.5 parts (polyisobutylene amine and polyether amine in a weight ratio of 1:1); Polyoxymethylene dimethyl ether wherein n is 2: 15 parts; Aromatic hydrocarbon solvent carrier: 70 parts (xylene); Anhydrous ethanol: 10 parts; Salicylaldehyde imine metal passivator: 0.5 parts.

[0029] Comparative Example 2 The difference from Example 1 is that only the raw material component ratio is different: Step (a) Prepare the raw materials: weigh the following according to the mass ratio: Amine gasoline detergent: 5 parts (polyisobutylene amine and polyether amine in a weight ratio of 1:1); Polyoxymethylene dimethyl ether wherein n is 2: 1 part; Aromatic hydrocarbon solvent carrier: 70 parts (xylene); Anhydrous ethanol: 10 parts; Salicylaldehyde imine metal passivator: 0.5 parts.

[0030] Comparative Example 3 The difference from Example 1 is that only the degree of polymerization of polyoxyethylene dimethyl ether is 1.

[0031] Comparative Example 4 The difference from Example 1 is that only the degree of polymerization of polyoxyethylene dimethyl ether is 6.

[0032] Comparative Example 5 The difference from Example 1 is that the only difference is the order of adding the components. In step (a), 85 parts of toluene are added to a stirred tank and stirred continuously at 200 rpm under normal temperature and pressure in a dry nitrogen atmosphere with an oxygen volume ratio of 0.008% and a water vapor content of 0.005%. Polyoxymethylene dimethyl ether is first slowly added at a rate of 0.5% / min of the mass of the amine gasoline detergent. After the addition is completed, the amine gasoline detergent is added after an interval of 5 minutes, and the addition time is controlled to 10 minutes.

[0033] Comparative Example 6 The difference from Example 1 is that the only difference is the order of adding the components. In step (a), 85 parts of toluene are added to a stirred kettle and stirred continuously at 200 rpm under normal temperature and pressure in a dry nitrogen atmosphere with an oxygen volume ratio of 0.008% and a water vapor content of 0.005%. Anhydrous ethanol is added first. Under continuous stirring, polyisobutyleneamine is slowly added at a rate of 0.5% / min of the mass of the amine gasoline detergent. After the addition is completed, polyoxyethylene dimethyl ether is added after an interval of 5 minutes, and the addition time is controlled to 10 minutes.

[0034] Comparative Example 7 The difference from Example 1 is that only the interval time after adding the amine gasoline detergent is missing: Step (a): 85 parts by weight of toluene are added to a stirred kettle, and the mixture is continuously stirred at 200 rpm under dry nitrogen with an oxygen volume ratio of 0.008% and a water vapor content of 0.005% at room temperature and pressure. Subsequently, 0.5 parts of an amine gasoline detergent is added at a rate of 0.5% by weight of the amine gasoline detergent per minute. After the addition is completed, stirring is continued, and then 2 parts of polyoxyethylene dimethyl ether with a degree of polymerization n of 2 are added, and the single addition time is controlled to be 10 minutes to obtain a main phase.

[0035] Comparative Example 8 The difference from Example 1 is that the amine gasoline detergent is added quickly: Step (a): 85 parts by weight of toluene are added to a stirred kettle, and the mixture is continuously stirred at 200 rpm under dry nitrogen with an oxygen volume ratio of 0.008% and a water vapor content of 0.005% at room temperature and pressure. Subsequently, 0.5 parts of an amine gasoline detergent is directly and completely added, and stirring is continued. After an interval of 5 minutes, 2 parts of polyoxyethylene dimethyl ether with a polymerization degree n of 2 are added, and the single addition time is controlled to be 10 minutes to obtain a main phase.

[0036] Comparative Example 9 The difference from Example 1 is that, in step (b): after the main phase is further stirred for 15 minutes, 5 parts of anhydrous ethanol are added at a rate of 0.075% / min of the total volume to a position 1 / 2 below the liquid level of the main phase. After the addition is complete, 0.1 parts of a salicylaldehyde imine metal passivator are added to obtain a crude product; and 0.001% of triethylamine by weight of the anhydrous ethanol is added to the anhydrous ethanol.

[0037] Comparative Example 10 The difference from Example 1 is that, in step (b): after the main phase is further stirred for 5 minutes, 5 parts of anhydrous ethanol are added at a rate of 0.15% / min of the total volume at a level 1 / 5 below the liquid level of the main phase. After the addition is completed, 0.1 parts of a salicylaldimine metal passivator are added to obtain a crude product; and 0.001% by weight of triethylamine is added to the anhydrous ethanol.

[0038] Comparative Example 11 The difference from Example 1 is that, according to the traditional preparation process, all components are mixed and stirred at one time, with a stirring rate of 350 rpm and a stirring time of 60 min.

[0039] Performance testing: The gasoline blending agents prepared in Examples 1-5 and Comparative Examples 1-10 were added to base gasoline of the same mass and brand at a ratio of 1 wt % by weight of the gasoline. With reference to GB 19592-2019, bench tests were conducted to compare the engine intake valve deposits, injector nozzle deposits, and combustion chamber carbon deposits of the gasolines to which the gasoline blending agents of Examples 1-5 and Comparative Examples 1-11 were added with the base gasoline without the blending agents (blank group). The test results are shown in Table 1.

[0040] Table 1 Test results of examples and comparative examples

[0041] Examples 1-5 can achieve simultaneous and efficient reduction of carbon deposits in both low-temperature and high-temperature engine zones. The key lies in the precise ratio of components and the preparation process that strictly matches the chemical properties of the components. However, due to deviations from this core logic, the performance differences of the comparative examples all occur: Comparative Examples 1 and 2 have ratios of amine gasoline detergent to oxygen-containing combustion promoter that exceed the optimal range set by the examples. Either insufficient amine leads to a loss of low-temperature cleaning ability, excessive oxygen-containing promoter easily agglomerates due to lack of synergy, or too little oxygen-containing promoter cannot meet the high-temperature combustion support and carbon reduction requirements, and excessive amine easily adsorbs impurities and exacerbates deposition. The synergistic basis of low-temperature cleaning and high-temperature carbon suppression of the two is destroyed; in Comparative Examples 3 and 4, the degree of polymerization of polyoxyethylene dimethyl ether deviates from the range of n=2-5 in the embodiment. The low-polymerization degree component with n=1 is volatile, resulting in insufficient oxygen content supply and inability to continuously suppress high-temperature carbon deposition. The high-polymerization degree component with n>6 is not completely burned and forms carbon deposition itself. At the same time, the two degrees of polymerization that deviate from the range destroy the molecular compatibility with the amine detergent and weaken the synergistic effect; in Comparative Examples 5 and 6, the order of adding components is reversed. Adding the oxygen-containing promoter first will change the polarity of the aromatic solvent, resulting in the subsequent precipitation of the amine detergent. The low-temperature cleaning performance is lost. Adding the dehydrating agent first will cause the trace water contained in it to trigger the hydrolysis and chain scission of the oxygen-containing accelerator in advance, destroying the oxygen-containing function. The lack of interval time in Comparative Example 7 prevents the polyoxyethylene dimethyl ether molecules from being embedded in the gaps between the hydrophobic chains of the polyetheramine, resulting in the double collapse of the colloidal dispersion network in the low-temperature zone and the oxygen free radical transmission chain in the high-temperature zone. In Comparative Example 8, due to the rapid addition of the amine detergent and the failure to follow the slow addition rate of the embodiment, the local concentration of the amine is too high and agglomerates, making it impossible to evenly act on the surface of the low-temperature zone to remove deposits. At the same time, the agglomerated amine destroys the hydrogen bond network with the oxygen-containing accelerator. This weakens the synergistic carbon reduction effect. Comparative Example 9 shows that prolonged stirring time in step (d) leads to increased carbon deposits. This may be due to the accumulated heat from stirring or the infiltration of a small amount of water from the gas, which causes hydrolysis of the amine gasoline detergent. However, compared with the other comparative examples, the performance loss of Comparative Example 9 is not significant. Comparative Example 10 shows that the dehydrating agent was added too quickly and close to the liquid surface, which may be due to poor dispersion of the dehydrating agent and local agglomeration, leading to hydrolysis of the amine gasoline detergent. The impact is slightly greater than that of Comparative Example 9, but still better than the other comparative examples, indicating the need to control the dehydrating agent addition process. Comparative Example 11 uses a traditional one-time mixing process, completely ignoring the step sequence designed based on the component characteristics of the examples. The components cannot achieve functional synergy, resulting in a certain carbon removal effect but unsatisfactory results, similar to the performance results caused by component deviation.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for preparing a gasoline blending agent, characterized in that: The following steps are involved: Step (a): adding 50-85 parts of an aromatic hydrocarbon solvent carrier by weight to a stirred kettle, stirring continuously at room temperature and pressure under protective gas, then adding 0.5-3 parts of an amine gasoline detergent at a rate of 0.5-1.0% / min based on the weight of the amine gasoline detergent. After the addition is completed, stirring continuously for 5-10 minutes, and then adding 2-10 parts of an oxygen-containing combustion accelerator, controlling the single addition time to be ≥10 minutes, to obtain a main phase; Step (b): After the main phase is stirred for 5-10 minutes, 5-20 parts of a dehydrating agent are added below the liquid level of the main phase at a rate of 0.05-0.1% of the total volume / min. After the addition is complete, 0.1-1 parts of a metal passivating agent are added to obtain a crude product; Step (c): the crude product is stirred at 200-400 rpm for 30-60 min to obtain a gasoline blending agent.

2. The method for preparing a gasoline blending agent according to claim 1, characterized in that: The amine gasoline detergent is a combination of polyisobutylene amine and polyether amine in a weight ratio of 1:1-2; the oxygen-containing combustion promoter is polymethoxydimethyl ether, whose polymerization degree n is 2-5; the aromatic hydrocarbon solvent carrier is one or more of benzene, toluene, xylene or C9-C10 heavy aromatic hydrocarbons; and the dehydrating agent is one of anhydrous ethanol, isopropyl alcohol or tert-butyl alcohol.

3. The method for preparing a gasoline blending agent according to claim 1, characterized in that: The protective gas described in step (a) is dry nitrogen, with an oxygen volume ratio of ≤0.01% and a water vapor content of ≤0.01%.

4. The method for preparing a gasoline blending agent according to claim 1, characterized in that: The stirring rate of the continuous stirring in step (a) is 200-400 rpm.

5. The method for preparing a gasoline blending agent according to claim 1, characterized in that: In step (b), 5-20 parts of dehydrating agent are added below the main phase liquid level at a rate of 0.05-0.1% / min of the total volume, specifically, 5-20 parts of dehydrating agent are added at a level 1 / 3-2 / 3 below the main phase liquid level.

6. The method for preparing a gasoline blending agent according to claim 1, characterized in that: In step (b), 0.001% triethylamine by weight of the dehydrating agent is added to the dehydrating agent.

7. A gasoline blending agent prepared by the method for preparing a gasoline blending agent according to any one of claims 1 to 6.

8. An application of a gasoline blending agent prepared by the method for preparing a gasoline blending agent according to any one of claims 1 to 6, characterized in that: It is added to base gasoline at a ratio of 0.1-1wt% to simultaneously reduce carbon deposits on intake valves, fuel injectors and combustion chambers.

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