A method for preparing a gasoline blending agent

Abstract

The present application relates to the field of fuel additive, in particular to a preparation method of gasoline blending agent, after weighing the weight of each component, strictly following the step sequence of first dispersing amine gasoline detergent, then adding polymethoxy dimethyl ether, adding dehydrating agent later, and finally introducing passivator. The present application takes components as the basis, and through optimizing the process of adding each component, a gasoline blending agent is prepared, which realizes synchronous reduction of carbon deposition in low temperature area and high temperature area of engine, and synchronously solves the problems of low temperature deposit and high temperature carbon deposition.

Description

Technical Field

[0001] This invention relates to the field of fuel additives, and more specifically to a method for preparing a gasoline blending agent. Background Technology

[0002] Engine carbon deposits mainly form in key parts such as intake valves, fuel injectors, and combustion chambers. This not only leads to decreased engine power and increased fuel consumption, but also causes a series of problems such as 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 means to solve engine carbon deposit problems. In existing technologies, polymer-based 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 polyetheramine, an octane number improver, and alkane solvent oil. This detergent can effectively remove carbon deposits from engine fuel injectors, combustion chambers, and intake valves, improving fuel economy.

[0004] To improve cleaning effectiveness, some technical solutions employ a multi-component synergistic strategy. CN110257114A discloses a multi-effect gasoline detergent that achieves the removal and inhibition of combustion chamber carbon deposits through the combination of multiple functional components such as carbon deposit removal inhibitors, octane number 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 fuel thermal efficiency. CN109280569A proposes a highly concentrated gasoline detergent containing polyetheramine and polyisobutyleneamine. This detergent can remove fuel injector deposits and intake valve deposits while reducing the formation of combustion chamber deposits. However, it is essentially a simple mixture of components without considering the characteristics of each component, leaving room for further performance improvement. Poor molecular compatibility between the functional components makes it difficult to synergistically remove low-temperature deposits and inhibit high-temperature carbon deposits. In addition, CN105695007B proposes a gasoline detergent containing a friction modifier, which adds lubrication function on the basis of cleaning performance, further improving fuel economy.

[0005] However, in existing compounding strategies, the poor molecular compatibility between functional components makes it difficult to coordinate low-temperature deposit removal and high-temperature carbon deposition inhibition. In some cases, the negative interaction between components makes the actual effect of the compound product lower than the simple sum of the performance of each single agent. In existing technical solutions, many products are simply prepared by mixing the components without considering the impact of the preparation process on performance, which prevents the potential between components from being fully released. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a gasoline blending agent. Based on its components, the process of adding each component is optimized to produce a gasoline blending agent that simultaneously reduces carbon deposits in both the low-temperature and high-temperature zones of the engine, thus simultaneously solving the problems of low-temperature deposits and high-temperature carbon buildup.

[0007] The technical solution adopted by this invention to solve its technical problem is: to provide a method for preparing a gasoline blending agent, comprising the following steps:

[0008] Step (a): By weight, add 50-85 parts of aromatic solvent carrier to a stirred tank and stir continuously under ambient temperature and pressure and a protective gas. Then add 0.5-3 parts of amine gasoline detergent at a rate of 0.5-1.0% / min of the weight of amine gasoline detergent. After the addition is complete, continue stirring. After 5-10 minutes, add 2-10 parts of oxygen-containing combustion promoter, controlling the single addition time to be ≥10 minutes, to obtain the main phase.

[0009] Step (b): After the main phase is stirred for 5-10 minutes, add 5-20 parts of dehydrating agent below the liquid surface of the main phase at a rate of 0.05-0.1% / min of total volume. After the addition is completed, add 0.1-1 parts of metal passivating agent to obtain crude product.

[0010] Step (c): Stir the crude product at 200-400 rpm for 30-60 minutes to obtain gasoline blending agent.

[0011] 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 polyoxymethylene dimethyl ether with a degree of polymerization n of 2-5; the aromatic solvent carrier is one or more of benzene, toluene, xylene or C9-C10 heavy aromatics; and the dehydrating agent is one of anhydrous ethanol, isopropanol or tert-butanol.

[0012] Polyisobutyleneamine, as a gasoline detergent, possesses excellent cleaning capabilities, effectively removing low-temperature deposits from engine intake valves and fuel injectors. Polyoxymethylene dimethyl ether (POMED), as an oxygen-containing combustion promoter, increases the oxygen content of fuel, promoting more complete combustion and reducing the formation of high-temperature carbon deposits. These two core functional components work synergistically to simultaneously inhibit low-temperature deposits on engine intake valves and fuel injectors, as well as high-temperature carbon deposits in the combustion chamber.

[0013] Aromatic solvent carriers effectively dissolve various functional components, ensuring product stability and homogeneity. Anhydrous ethanol, as a dehydrating agent, absorbs moisture in the fuel system, improving the fuel's anti-knock properties. Organic amine passivating agents form stable complexes with metal ions, preventing metal-catalyzed oxidation reactions and extending the product's shelf life.

[0014] This solution optimizes the degree of polymerization of polyoxymethylene dimethyl ether (POM) to 2-5, avoiding both the high volatility loss associated with low-polymerization-degree components (n=1) and the risk of carbon buildup due to incomplete combustion of high-polymerization-degree components (n>5). Through innovative component design and compatibility mechanisms, the solution addresses the negative interactions caused by poor molecular compatibility between components in traditional compound formulations, resulting in a composite modifier whose overall effect surpasses the simple summation of the performance of individual agents.

[0015] In this scheme, "room temperature" refers to around 25°C, and "normal pressure" refers to around one atmosphere. To achieve the synergistic carbon reduction effect of polyoxymethylene dimethyl ether (POMEE) and polyetheramine detergents in gasoline blending agents, the preparation method must strictly follow the sequence of steps: first, disperse the amine gasoline detergent; then add POMEE; next, add the dehydrating agent; and finally, introduce the passivating agent. This is because POMEE molecules with n=2-5 have a strongly polar ether bond structure and medium viscosity. If an aromatic carrier is added before the amine gasoline detergent, the polyetheramine in the amine gasoline detergent will precipitate and lose its low-temperature detergent properties due to solvent polarity conflict. Furthermore, the terminal methoxy groups (-...) of POMEE with a specific degree of polymerization of n=2-5... OCH3) is highly sensitive to hydrolysis because: the polarity of the CO bond leads to the positive charge of the carbon, making it susceptible to nucleophilic attack; and the terminal position lacks steric protection, therefore, the hydrolysis of n=2-5 is faster for longer chains, producing methanol / formaldehyde, which destroys the oxygen-containing function of the molecule. If introduced after the addition of a dehydrating agent (such as anhydrous ethanol containing trace amounts of water), it will trigger the hydrolysis and chain scission of polyoxymethylene dimethyl ether, generating formaldehyde / methanol, causing oxygen loss and failure of high-temperature coking inhibition. Essentially, the dehydrating agent described in this solution acts to capture water molecules. Since dehydrating agents such as anhydrous ethanol inevitably contain 0.2% water, if 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 a case of a small amount of oxygen-containing combustion accelerator encountering a "large amount of water" (similar to water entering acid during the dilution of concentrated sulfuric acid), resulting in rapid hydrolysis. Conversely, if the oxygen-containing combustion accelerator is added first, followed by the dehydrating agent at a controlled rate, it is equivalent to encountering only a small amount of water. After this 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, terminating the hydrolysis reaction (similar to acid entering water during the dilution of concentrated sulfuric acid). Furthermore, to prevent uneven dispersion of the dehydrating agent due to density differences, this scheme uses... The substance is slowly injected into the system below the liquid level, preferably at 1 / 3-2 / 3 of the liquid 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 (POMME), the metal ions released by its chelating components will catalyze the oxidation and gelation of POMME. This not only clogs the fuel injectors and exacerbates low-temperature deposition, but also destroys the hydrogen bond network between the molecules of polyetheramine and POMME. This core structure is the synergistic basis for the simultaneous removal of carbon deposits at high and low temperatures. Polyetheramine adsorbs dispersed colloids on the metal surface, while POMME embeds itself between its hydrophobic chains, releasing reactive oxygen free radicals to optimize combustion. Therefore, any change in the order of steps will irreversibly disrupt the molecular-level compatibility mechanism, causing the high-temperature carbon reduction advantage of POMME (n=2-5) and the low-temperature cleaning ability of polyetheramine to degrade from synergistic enhancement to offsetting effects. Therefore, this process sequence is a necessary technical condition for achieving full-area carbon deposit inhibition.

[0016] Preferably, the protective gas in step (a) is dry nitrogen, with an oxygen volume percentage of ≤0.01% and a water vapor content of ≤0.01%.

[0017] Preferably, the stirring rate in step (a) is 200-400 rpm.

[0018] Preferably, in step (b), the addition of 5-20 parts of dehydrating agent at a rate of 0.05-0.1% / min of total volume below the liquid surface of the main phase specifically means adding 5-20 parts of dehydrating agent at a liquid level of 1 / 3-2 / 3 below the liquid surface of the main phase.

[0019] Preferably, the dehydrating agent contains 0.001% by weight of triethylamine to further control hydrolysis.

[0020] This solution also provides a gasoline blending agent prepared by the above method.

[0021] The present invention also provides the application of the gasoline blending agent prepared by the above preparation method in gasoline fuel, which is added to the base gasoline at a ratio of 0.1-1 wt% to simultaneously reduce carbon deposits in the intake valve, fuel injector and combustion chamber.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. Composition: Through the synergistic effect of specific components, this solution simultaneously reduces gum and sludge deposits in low-temperature engine areas, such as intake valves and fuel injectors, as well as carbon deposits in high-temperature areas, such as the combustion chamber and piston tops, overcoming the limitations of single-component solutions in existing technologies. When using this solution, adding the gasoline blending agent to base gasoline at a ratio of 0.1-1 wt% effectively achieves simultaneous reduction of carbon deposits across the entire engine range, improving internal combustion engine efficiency.

[0024] 2. In the preparation process, there are strict requirements for the order and rate of material addition, which depend on the characteristics of the material components. A reasonable order and rate of addition can maximize the simultaneous reduction of carbon deposits in the low-temperature and high-temperature zones of the engine, and can simultaneously solve the problems of low-temperature deposits and high-temperature carbon deposits. The components have good compatibility and high stability. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0026] General Implementation Examples

[0027] A method for preparing a gasoline blending agent includes the following steps:

[0028] Step (a): Add 50-85 parts by weight of aromatic solvent carrier to a stirred tank and stir continuously at 200-400 rpm under a protective gas at 25°C and 1 atm. Then add 0.5-3 parts of amine gasoline detergent at a rate of 0.5-1.0% / min of the weight of amine gasoline detergent. After the addition is complete, continue stirring. After 5-10 min intervals, add 2-10 parts of oxygen-containing combustion promoter, controlling the single addition time to ≥10 min, to obtain the main phase.

[0029] The protective gas is dry nitrogen, with an oxygen volume percentage of 0.008% and a water vapor content of 0.005%.

[0030] The aromatic solvent carrier is one or more of benzene, toluene, xylene, or C9-C10 heavy aromatics; 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 polyoxymethylene dimethyl ether with a degree of polymerization n of 2-5.

[0031] Step (b): After the main phase is stirred for 5-10 minutes, add 5-20 parts of dehydrating agent at a rate of 0.05-0.1% / min below the liquid level of the main phase, at a depth of 1 / 3-2 / 3. After the addition is complete, add 0.1-1 parts of metal passivating agent to obtain the crude product. The metal passivating agent is a salicylaldehyde imine type metal passivating agent, specifically 3,5-di-tert-butylsalicylaldehyde imine.

[0032] The dehydrating agent is one of anhydrous ethanol, isopropanol, or tert-butanol; the dehydrating agent contains 0.001% triethylamine by weight.

[0033] Step (c): Stir the crude product at 200-400 rpm for 30-60 minutes to obtain gasoline blending agent.

[0034] Example 1

[0035] A method for preparing a gasoline blending agent includes the following steps:

[0036] Step (a): By weight, 85 parts of toluene were added to a stirred tank and stirred continuously at 200 rpm under dry nitrogen gas with an oxygen volume ratio of 0.008% and a water vapor content of 0.005% at room temperature and pressure. Then, 0.5 parts of amine gasoline detergent were added at a rate of 0.5% / min of the weight of amine gasoline detergent. After the addition was completed, stirring was continued. After a 5-minute interval, 2 parts of polyoxymethylene dimethyl ether with a degree of polymerization n of 2 were added. The single addition time was controlled to be 10 minutes to obtain the main phase.

[0037] Amine gasoline detergent is a combination of polyisobutylene amine and polyether amine in a weight ratio of 1:1;

[0038] 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 below the liquid level of the main phase to a depth of 1 / 2. After the addition is completed, 0.1 parts of salicylaldehyde imine metal passivating agent are added to obtain the crude product; 0.001% by weight of triethylamine is added to the anhydrous ethanol.

[0039] Step (c): Stir the crude product at 200 rpm for 60 minutes to obtain gasoline blending agent.

[0040] Example 2

[0041] A method for preparing a gasoline blending agent includes the following steps:

[0042] Step (a): Add 70 parts by weight of xylene to a stirred tank and stir continuously at 300 rpm under a protective gas at 25°C and 1 atmosphere. Then add 1.5 parts of amine gasoline detergent at a rate of 0.8% / min of the weight of amine gasoline detergent. After the addition is complete, continue stirring. After 7 min intervals, add 5 parts of polyoxymethylene dimethyl ether with n=3. Control the single addition time to 12 min to obtain the main phase.

[0043] The protective gas is dry nitrogen, with an oxygen volume percentage of 0.008% and a water vapor content of 0.005%.

[0044] The amine-based gasoline detergent is a combination of polyisobutylene amine and polyether amine in a weight ratio of 1:1.5;

[0045] Step (b): After the main phase is stirred for 8 minutes, 10 parts of isopropanol are added at a rate of 0.1% / min below the liquid level of the main phase to a depth of 1 / 3. After the addition is completed, 0.5 parts of salicylaldehyde imine metal passivating agent are added to obtain the crude product.

[0046] The isopropanol contains 0.001% triethylamine by weight of isopropanol.

[0047] Step (c): Stir the crude product at 300 rpm for 45 minutes to obtain gasoline blending agent.

[0048] Example 3

[0049] A method for preparing a gasoline blending agent includes the following steps:

[0050] Step (a): By weight, 55 parts of C9 heavy aromatic hydrocarbons were added to a stirred tank and stirred continuously at 350 rpm under a protective gas at 25°C and 1 atmosphere. Then, 3 parts of amine gasoline detergent were added at a rate of 1.0% / min of the weight of the amine gasoline detergent. After the addition was completed, stirring was continued. After 10 min intervals, 8 parts of polyoxymethylene dimethyl ether with n=4 were added, and the single addition time was controlled to be 15 min to obtain the main phase.

[0051] The protective gas is dry nitrogen, with an oxygen volume percentage of 0.008% and a water vapor content of 0.005%.

[0052] Amine gasoline detergent is a combination of polyisobutylene amine and polyether amine in a weight ratio of 1:1;

[0053] Step (b): After the main phase is stirred for 10 min, 15 parts of tert-butanol are added at a rate of 0.05% / min below the liquid level of the main phase to a depth of 1 / 2. After the addition is completed, 0.8 parts of salicylaldehyde imine metal passivating agent are added to obtain the crude product.

[0054] The tert-butanol contains 0.001% triethylamine by weight of tert-butanol;

[0055] Step (c): Stir the crude product at 350 rpm for 30 minutes to obtain gasoline blending agent.

[0056] Example 4

[0057] A method for preparing a gasoline blending agent includes the following steps:

[0058] Step (a): By weight, add 50 parts of benzene and toluene in a 1:1 mass ratio to a stirred tank. Stir continuously at 400 rpm under a protective gas at 25°C and 1 atmosphere. Then add 2 parts of amine gasoline detergent at a rate of 0.6% / min of the weight of the amine gasoline detergent. After the addition is complete, continue stirring. After an 8-minute interval, add 10 parts of polyoxymethylene dimethyl ether with n=5. Control the single addition time to 11 minutes to obtain the main phase.

[0059] The protective gas is dry nitrogen, with an oxygen volume percentage of 0.008% and a water vapor content of 0.005%.

[0060] Amine gasoline detergent is a combination of polyisobutylene amine and polyether amine in a weight ratio of 1:2;

[0061] Step (b): After the main phase is stirred for 5 minutes, 20 parts of anhydrous ethanol are added at a rate of 0.075% / min below the liquid level of the main phase to a depth of 1 / 2. After the addition is completed, 1 part of salicylaldehyde imine metal passivating agent is added to obtain the crude product.

[0062] The anhydrous ethanol contains 0.001% triethylamine by weight of the anhydrous ethanol.

[0063] Step (c): Stir the crude product at 400 rpm for 50 minutes to obtain gasoline blending agent.

[0064] Example 5

[0065] A method for preparing a gasoline blending agent includes the following steps:

[0066] Step (a): Add 80 parts by weight of xylene to a stirred tank and stir continuously at 250 rpm under a protective gas at room temperature of 25°C and atmospheric pressure of 1 atmosphere. Then add 1 part of amine gasoline detergent at a rate of 0.7% / min of the weight of amine gasoline detergent. After the addition is complete, continue stirring. After 6 min intervals, add 3 parts of polyoxymethylene dimethyl ether with n=2, controlling the single addition time to 13 min to obtain the main phase.

[0067] The protective gas is dry nitrogen, with an oxygen volume percentage of 0.008% and a water vapor content of 0.005%.

[0068] Amine gasoline detergent is a combination of polyisobutylene amine and polyether amine in a weight ratio of 1:2;

[0069] Step (b): After the main phase is stirred for 5-10 minutes, 12 parts of tert-butanol are added at a rate of 0.075% / min below the liquid level of the main phase to a depth of 2 / 3. After the addition is completed, 0.3 parts of salicylaldehyde imine metal passivating agent are added to obtain the crude product.

[0070] The tert-butanol contains 0.001% triethylamine by weight of tert-butanol;

[0071] Step (c): Stir the crude product at 250 rpm for 40 minutes to obtain gasoline blending agent.

[0072] Comparative Example 1

[0073] The difference from Example 1 is only in the proportion of the raw material components:

[0074] Step (a) Prepare raw materials: Weigh out the raw materials according to the mass ratio.

[0075] Amine gasoline detergent: 1.5 parts (polyisobutylene amine and polyether amine combined in a 1:1 weight ratio);

[0076] Polymethoxydimethyl ether with n=2: 15 parts;

[0077] Aromatic solvent carrier: 70 parts (xylene);

[0078] Anhydrous ethanol: 10 parts;

[0079] Salicylaldehyde imine metal passivating agent: 0.5 parts.

[0080] Comparative Example 2

[0081] The difference from Example 1 is only in the proportion of the raw material components:

[0082] Step (a) Prepare raw materials: Weigh out the raw materials according to the mass ratio.

[0083] Amine gasoline detergent: 5 parts (polyisobutylene amine and polyether amine combined in a 1:1 weight ratio);

[0084] Polymethoxydimethyl ether with n=2: 1 part;

[0085] Aromatic solvent carrier: 70 parts (xylene);

[0086] Anhydrous ethanol: 10 parts;

[0087] Salicylaldehyde imine metal passivating agent: 0.5 parts.

[0088] Comparative Example 3

[0089] The difference from Example 1 is that only the degree of polymerization of polyoxymethylene dimethyl ether is 1.

[0090] Comparative Example 4

[0091] The difference from Example 1 is that only the degree of polymerization of polyoxymethylene dimethyl ether is 6.

[0092] Comparative Example 5

[0093] The difference from Example 1 is that only the order of component addition is different. In step (a), 85 parts of toluene are added to a stirred tank and stirred continuously at 200 rpm under dry nitrogen gas with an oxygen volume ratio of 0.008% and a water vapor content of 0.005% at room temperature and pressure. First, polyoxymethylene dimethyl ether is slowly added at 0.5% / min of the mass of amine gasoline detergent. After the addition is completed, the amine gasoline detergent is added again after an interval of 5 min, and the addition time is controlled to 10 min.

[0094] Comparative Example 6

[0095] The difference from Example 1 is that only the order of component addition is different. In step (a), 85 parts of toluene are added to a stirred tank and stirred continuously at 200 rpm under dry nitrogen gas with an oxygen volume ratio of 0.008% and a water vapor content of 0.005% at room temperature and pressure. Anhydrous ethanol is added first, and under continuous stirring, polyisobutylene amine is slowly added at 0.5% / min of the mass of amine gasoline detergent. After the addition is completed, polyoxymethylene dimethyl ether is added after an interval of 5 min, and the addition time is controlled at 10 min.

[0096] Comparative Example 7

[0097] The difference from Example 1 is that only the interval after adding the amine gasoline detergent is missing:

[0098] Step (a): By weight, 85 parts of toluene were added to a stirred tank and stirred continuously at 200 rpm under dry nitrogen gas with an oxygen volume percentage of 0.008% and a water vapor content of 0.005% at room temperature and pressure. Then, 0.5 parts of amine gasoline detergent were added at a rate of 0.5% / min of the weight of amine gasoline detergent. After the addition was completed, stirring was continued. Then, 2 parts of polyoxymethylene dimethyl ether with a degree of polymerization n of 2 were added, and the single addition time was controlled to be 10 min to obtain the main phase.

[0099] Comparative Example 8

[0100] The difference from Example 1 is that the amine gasoline detergent is added quickly:

[0101] Step (a): By weight, 85 parts of toluene were added to a stirred tank and stirred continuously at 200 rpm under dry nitrogen gas with an oxygen volume percentage of 0.008% and a water vapor content of 0.005% at room temperature and pressure. Then, 0.5 parts of amine gasoline detergent were added directly and completely, and stirring was continued. After 5 minutes, 2 parts of polyoxymethylene dimethyl ether with a degree of polymerization n of 2 were added, and the single addition time was controlled to be 10 minutes to obtain the main phase.

[0102] Comparative Example 9

[0103] The difference from Example 1 is that in step (b): after the main phase is stirred for 15 minutes, 5 parts of anhydrous ethanol are added at a rate of 0.075% / min below the liquid level of the main phase. After the addition is completed, 0.1 parts of salicylaldehyde imine metal passivating agent are added to obtain the crude product; 0.001% by weight of triethylamine is added to the anhydrous ethanol.

[0104] Comparative Example 10

[0105] The difference from Example 1 is that in step (b): after the main phase is stirred for 5 minutes, 5 parts of anhydrous ethanol are added at a rate of 0.15% / min below the liquid level of the main phase to a depth of 1 / 5. After the addition is completed, 0.1 parts of salicylaldehyde imine metal passivating agent are added to obtain the crude product; 0.001% by weight of triethylamine is added to the anhydrous ethanol.

[0106] Comparative Example 11

[0107] 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.

[0108] Performance testing:

[0109] The gasoline blending agents prepared in Examples 1-5 and Comparative Examples 1-10 were added to the same mass and grade of base gasoline at a ratio of 1 wt% of gasoline weight. According to GB19592-2019, bench tests were conducted to compare the gasoline with gasoline containing the gasoline blending agents in Examples 1-5 and Comparative Examples 1-11 with base gasoline without blending agents (blank group). The test results on engine intake valve deposits, fuel injector deposits, and combustion chamber carbon deposits are shown in Table 1.

[0110] Table 1. Test results of the examples and comparative examples.

[0111]

[0112] Examples 1-5 achieve simultaneous and efficient reduction of carbon deposits in both low-temperature and high-temperature engine zones. The core lies in the precise ratio of components and the preparation process that strictly matches the chemical properties of the components. However, each comparative example deviates from this core logic, resulting in performance differences: Comparative examples 1 and 2 have ratios of amine gasoline detergent and oxygen-containing combustion promoter that exceed the optimal range set in the examples. Either insufficient amines lead to a lack of low-temperature cleaning ability, or excessive oxygen-containing promoters are prone to agglomeration due to lack of synergy; or insufficient oxygen-containing promoters cannot meet the high-temperature combustion-supporting and carbon reduction requirements, or excessive amines easily adsorb impurities and exacerbate deposition. This disrupted the synergistic effect of low-temperature cleaning and high-temperature carbon suppression between the two components. In Comparative Examples 3 and 4, the degree of polymerization of polyoxymethylene dimethyl ether deviated from the range of n=2-5 in Examples 1. The low degree of polymerization component with n=1 was easily volatile, resulting in insufficient oxygen supply and inability to continuously suppress high-temperature carbon deposition. The high degree of polymerization component with n>6 did not burn completely and instead formed carbon deposits itself. At the same time, both degrees of polymerization that deviated from the range disrupted the molecular compatibility with the amine detergent, weakening the synergistic effect. In Comparative Examples 5 and 6, the reversed order of component addition—adding the oxygen-containing accelerator first—changed the polarity of the aromatic solvent, leading to the subsequent precipitation of the amine detergent. In Comparative Example 7, the lack of a proper low-temperature cleaning agent, coupled with the premature addition of a dehydrating agent, causes the trace amounts of water in the sample to prematurely hydrolyze and break the oxygen-containing promoter, thus impairing its oxygen-containing function. In Comparative Example 8, the rapid addition of the amine detergent, contrary to the slow addition rate of the previous examples, resulted in excessively high local concentrations of amines, leading to aggregation and preventing uniform action on the surface of the low-temperature zone to remove deposits. Furthermore, the aggregated amines disrupted the hydrogen bond network with the oxygen-containing promoter. The synergistic carbon reduction effect is weakened. Comparative Example 9 shows that prolonged stirring time in step (d) leads to increased carbon deposits. This may be due to the heat accumulated during stirring or the hydrolysis of amine gasoline detergents caused by the infiltration of small amounts of moisture in the gas. However, compared to other comparative examples, the performance loss in Comparative Example 9 is not significant. Comparative Example 10 shows that adding the dehydrating agent too quickly and too close to the liquid surface may have resulted in poor dispersion of the dehydrating agent, leading to localized agglomeration and hydrolysis of the amine gasoline detergents. The impact is slightly greater than in 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 disregarding the step sequence designed based on component characteristics in the examples. The components cannot exert their functional synergy, resulting in a certain carbon removal effect, but the results are not ideal, similar to the performance results caused by component deviation.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a gasoline blending agent, characterized in that, Includes the following steps: Step (a): By weight, add 50-85 parts of aromatic solvent carrier to a stirred tank and stir continuously under ambient temperature and pressure and a protective gas. Then add 0.5-3 parts of amine gasoline detergent at a rate of 0.5-1.0% / min of the weight of amine gasoline detergent. After the addition is complete, continue stirring. After 5-10 minutes, add 2-10 parts of oxygen-containing combustion promoter, controlling the single addition time to be ≥10 minutes, to obtain the main phase. The oxygen-containing combustion promoter is polyoxymethylene dimethyl ether, with a degree of polymerization n of 2-5; Step (b): After the main phase is stirred for 5-10 minutes, add 5-20 parts of dehydrating agent below the liquid surface of the main phase at a rate of 0.05-0.1% / min of total volume. After the addition is completed, add 0.1-1 parts of metal passivating agent to obtain crude product. The dehydrating agent contains 0.001% triethylamine by weight. The amine gasoline detergent is a combination of polyisobutylene amine and polyether amine in a weight ratio of 1:1-2; The dehydrating agent is one of anhydrous ethanol, isopropanol, or tert-butanol; Step (c): Stir the crude product at 200-400 rpm for 30-60 minutes to obtain gasoline blending agent.

2. The method for preparing a gasoline blending agent according to claim 1, characterized in that, The aromatic solvent carrier is one or more of benzene, toluene, xylene, or C9-C10 heavy aromatics.

3. The method for preparing a gasoline blending agent according to claim 1, characterized in that, The protective gas mentioned in step (a) is dry nitrogen, with an oxygen volume percentage 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 speed 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), the addition of 5-20 parts of dehydrating agent at a rate of 0.05-0.1% / min of total volume below the liquid surface of the main phase specifically means adding 5-20 parts of dehydrating agent at a liquid level of 1 / 3-2 / 3 below the liquid surface of the main phase.

6. A gasoline blending agent prepared by the method of any one of claims 1-5.

7. The application of a gasoline blending agent prepared using the method for preparing a gasoline blending agent according to any one of claims 1-5, characterized in that, Add to base gasoline at a ratio of 0.1-1 wt% to simultaneously reduce carbon deposits on intake valves, fuel injectors, and combustion chambers.

Images