A fuel for replacing engine gasoline and its preparation method

Abstract

This invention discloses a fuel for replacing gasoline in engines and its preparation method, belonging to the field of new energy fuel technology. The fuel comprises methanol, naphtha, a composite cosolvent, a composite corrosion inhibitor, a composite power enhancer, a cold start aid, a lubricant, and an antioxidant. The composite cosolvent is composed of tert-butanol, dimethyl carbonate, and alkyl glycosides, achieving wide-temperature-range homogeneous stability and strong water resistance. The composite corrosion inhibitor is composed of benzotriazole, organic amine esters, and fatty amines, effectively inhibiting metal corrosion. The composite power enhancer is composed of isooctyl nitrate and polyoxymethylene dimethyl ether, improving octane number and combustion efficiency. Combined with the cold start aid, lubricant, and antioxidant, the resulting fuel exhibits excellent low-temperature stability, good water resistance, low corrosivity, good cold start performance, power output close to that of traditional gasoline, reduced exhaust emissions, good storage stability, and low raw material costs, effectively replacing traditional gasoline.

Description

Technical Field

[0001] This invention relates to the field of new energy fuel technology, and in particular to a fuel for replacing gasoline in engines and a method for preparing the same. Background Technology

[0002] As the global energy crisis intensifies, the contradiction between the non-renewable nature of oil resources and the continuous growth of car ownership is becoming increasingly prominent. As a major oil importer, my country's over-reliance on petroleum-based gasoline not only poses a severe challenge to energy security, but also causes serious damage to the ecological environment due to pollutants such as carbon monoxide, nitrogen oxides, and volatile organic compounds emitted during the combustion of traditional gasoline, which contradicts the "dual carbon" goals and the needs of environmentally friendly development.

[0003] At present, the research and development of gasoline alternative fuels has become the key direction for solving the above problems. Methanol fuel has become a research hotspot in the field of alternative fuels due to its advantages such as wide availability of raw materials, low production cost and clean combustion. However, high proportion of methanol alternative fuels still have the following technical bottlenecks: (1) Low temperature stratification: When methanol is mixed with hydrocarbon gasoline fuel, it is very easy to stratify under low temperature or water conditions, which leads to difficulty in starting the engine and unstable combustion; (2) Metal corrosion: Methanol inevitably produces aldehydes and acids (such as formaldehyde and formic acid) during production and use. Methanol itself is hygroscopic and will generate a small amount of organic acids when oxidized by air during storage and use. These acidic substances will cause corrosion and wear to metal parts such as copper and aluminum in the engine fuel system; (3) Difficulty in cold starting: Alcohol fuels have high latent heat of vaporization and are difficult to start in cold environments; (4) Insufficient power: The calorific value of alcohol fuels is generally lower than that of standard hydrocarbon gasoline fuels, which leads to a decrease in vehicle power performance.

[0004] Therefore, existing methanol alternative fuels cannot simultaneously solve the problems and defects of low-temperature phase separation, metal corrosion, cold start difficulty, and insufficient power. Summary of the Invention

[0005] The purpose of this invention is to provide a fuel for replacing gasoline in engines and a method for preparing the same, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides a fuel for replacing gasoline in engines, comprising, by weight, the following raw materials: 70-90 parts methanol, 8-25 parts naphtha, 3-8 parts composite cosolvent, 0.5-2.5 parts composite corrosion inhibitor, 2-5 parts composite energy enhancer, 0.5-2 parts cold start aid, 0.2-1 parts lubricant, and 0.05-0.2 parts antioxidant.

[0007] Preferably, the naphtha is light petroleum naphtha with a distillation range of 30~120℃.

[0008] Preferably, the composite cosolvent is composed of tert-butanol, dimethyl carbonate and alkyl glycoside in a mass ratio of (4~6):(2~3):(1~2), wherein the alkyl glycoside is an alkyl glycoside with a carbon chain length of C8~C14 and an HLB value of 12~16.

[0009] Preferably, the composite corrosion inhibitor is composed of benzotriazole, organic amine ester and fatty amine in a mass ratio of 1:(1.5~2.5):(0.05~0.1); wherein the organic amine ester is oleic acid triethanolamine ester or naphthenic acid amine ester with an amine value of 150~250mg KOH / g, and the fatty amine is oleylamine or octadecylamine.

[0010] Preferably, the composite energy enhancer is a mixture of isooctyl nitrate and polymethoxydimethyl ether in a mass ratio of 1:(2~3); wherein the polymethoxydimethyl ether is DMM3-5.

[0011] Preferably, the cold start aid is diethyl ether or petroleum ether; the lubricant is polyetheramine; and the antioxidant is 2,6-di-tert-butyl-p-cresol.

[0012] Preferably, the polyetheramine has a number-average molecular weight of 1000-2000 and an amine value ≥200mg KOH / g.

[0013] The present invention also provides a method for preparing a fuel for replacing engine gasoline, comprising the following steps: S1. Dehydrate the methanol to a water content ≤0.2%, and filter the naphtha to remove impurities; S2. Mix the composite cosolvent, composite corrosion inhibitor, composite energy enhancer, cold start aid, lubricant and antioxidant according to the ratio to obtain the additive mother liquor. S3. Add naphtha and methanol to a stirring vessel, then add the additive mother liquor, stir and mix until clear, then age for 2-4 hours after high-speed shear homogenization treatment, and filter to obtain the finished product.

[0014] Preferably, in step S3, the stirring speed is 500~700 r / min, the stirring time is 20~30 min, the homogenization linear velocity is 15~25 m / s, and the processing time is 10~15 min.

[0015] Preferably, in step S3, the filter screen used for filtration has a pore size of 1~3μm.

[0016] This invention uses methanol as the main fuel, compounded with naphtha as a combustion aid. A composite cosolvent composed of tert-butanol, dimethyl carbonate, and alkyl glycosides utilizes a hydrogen bond network to achieve wide-temperature-range homogeneous stability and improve water resistance. A ternary corrosion inhibitor composed of benzotriazole, organic amine esters, and fatty amines is employed. Benzotriazole primarily targets copper, forming a dense adsorption film on the metal surface; organic amine esters neutralize acids and protect iron and aluminum; and fatty amines fill microscopic defects in the adsorption films of the former two, thus forming a dense protective layer. The combined use of these three components forms a composite protective layer on the metal surface, consisting of a chemical adsorption film, a reaction film, and a filling film, achieving all-metal, all-around corrosion inhibition. A composite energy enhancer composed of isooctyl nitrate and polyoxymethylene dimethyl ether improves octane number and combustion efficiency, compensating for the insufficient calorific value of methanol. A low-boiling-point cold-start aid improves low-temperature atomization performance, ensuring normal start-up in cold environments. Lubricants and antioxidants respectively enhance fuel lubricity and long-term storage stability.

[0017] This invention can be used directly without engine modification, resulting in low barriers to industrialization; it maintains homogeneous stability over a wide temperature range and exhibits strong water resistance; it has excellent corrosion inhibition performance, effectively extending the life of the engine oil circuit system; it has good cold start performance, and its power output is close to that of traditional gasoline; its raw material cost is significantly lower than that of gasoline, resulting in outstanding economic benefits; it significantly reduces the emission of various pollutants in exhaust gas, demonstrating superior environmental performance; and it helps reduce dependence on imported petroleum by replacing petroleum-based gasoline with widely available methanol.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] Figure 1 This is a comparison chart of RON, MON and explosion resistance index of Examples 1-3 and Comparative Example 5 of the present invention; Figure 2 This is a comparison chart of the maximum power retention rate and maximum torque retention rate of Embodiments 1-3 and Comparative Example 5 of the present invention. Detailed Implementation

[0020] This invention provides a fuel for replacing gasoline in engines, comprising, by weight, the following raw materials: 70-90 parts methanol, 8-25 parts naphtha, 3-8 parts composite cosolvent, 0.5-2.5 parts composite corrosion inhibitor, 2-5 parts composite energy enhancer, 0.5-2 parts cold start aid, 0.2-1 parts lubricant, and 0.05-0.2 parts antioxidant.

[0021] In this invention, methanol is industrial-grade anhydrous methanol, which can be sourced from coal chemical industry, natural gas or biomass, and is low-cost and renewable. The naphtha is selected as light naphtha with a distillation range of 30~120℃ as a combustion-supporting component and solvent to compensate for the insufficient calorific value of methanol, while improving the compatibility with the original fuel system of the engine. In this invention, naphtha is selected instead of finished gasoline, which can further reduce costs.

[0022] In this invention, the composite co-solvent is composed of tert-butanol, dimethyl carbonate (DMC), and alkyl glycosides (APG) in a mass ratio of (4-6):(2-3):(1-2). Tert-butanol possesses a good hydrophilic-lipophilic balance, allowing it to dissolve both methanol and hydrocarbons. Dimethyl carbonate has a high oxygen content, promoting combustion and exhibiting excellent low-temperature miscibility. The alkyl glycosides are alkyl glycosides with a carbon chain length of C8-C14, an average degree of polymerization of 1.4-1.6, and an HLB value of 12-16. As a green nonionic surfactant, it can form hydrogen bonds with water molecules, improving the fuel's water resistance and low-temperature stability. The three components synergistically form a "hydrogen bond network," enabling the fuel to achieve homogeneity over a wide temperature range and preventing stratification upon contact with small amounts of water.

[0023] In this invention, the composite corrosion inhibitor is composed of benzotriazole (BTA), organic amine esters, and fatty amines in a mass ratio of 1:(1.5~2.5):(0.05~0.1). The organic amine ester is triethanolamine oleate or naphthenic acid amine ester, with an amine value of 150~250 mg KOH / g; the fatty amine is oleylamine or octadecylamine. BTA can form a chemisorption film on copper and silver surfaces, the organic amine ester can neutralize organic acids and form a protective film on cast iron and aluminum surfaces, and the fatty amine can enhance the film's density and durability.

[0024] In this invention, the composite energy enhancer is composed of isooctyl nitrate (2-EHN) and polymethoxydimethyl ether (DMM3-5) in a mass ratio of 1:(2~3). Isooctyl nitrate increases the octane number and suppresses knocking, while DMM3-5 is a trimer to pentamer mixture of acetals with an average molecular weight of approximately 200~350, which improves combustion efficiency and compensates for the insufficient calorific value of methanol. The synergistic effect of both enhances fuel power output.

[0025] In this invention, the cold start aid is diethyl ether or petroleum ether, whose low boiling point makes the fuel easier to atomize at low temperatures, ensuring successful starting at low temperatures; the lubricant is polyetheramine (PEA) with a number average molecular weight Mn=1000~2000 and an amine value ≥200mg KOH / g. Polyetheramine can be well dissolved in methanol / naphtha mixtures and is used to improve the lubricity of high-proportion methanol fuels and reduce wear on high-pressure oil pumps and injectors; the antioxidant is 2,6-di-tert-butyl-p-cresol (BHT), which can inhibit the oxidative deterioration of fuel during long-term storage and extend the shelf life.

[0026] The present invention also provides a method for preparing a fuel for replacing engine gasoline, comprising the following steps: S1. Methanol is dehydrated by passing it through a 3A molecular sieve adsorption tower to control the water content to ≤0.2%; naphtha is filtered through a 5μm filter to remove impurities.

[0027] S2. According to the formula, add the composite cosolvent, composite corrosion inhibitor, composite energy enhancer, cold start aid, lubricant and antioxidant to the stirred tank in sequence, and stir at 300~500r / min for 15~20min at room temperature and pressure until completely dissolved and transparent to obtain the additive mother liquor.

[0028] S3. First, add naphtha to the stirred tank, then add pretreated methanol, and start stirring at a speed of 500~700 r / min. Then, slowly add the additive mother liquor prepared in S2 and continue stirring for 20~30 min until the mixture is completely clear. Then, pass the mixture through a high-speed shear homogenizer at an online speed of 15~25 m / s for 10~15 min to make the components evenly dispersed. Finally, let the homogenized fuel stand and age for 2~4 hours, and then filter it through a filter element with a precision of 1~3 μm to obtain the finished fuel.

[0029] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention. Furthermore, it should be understood that after reading the contents of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims and are all within the protection scope of the present invention.

[0030] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The term "embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment, nor does it specifically limit its independence or connection with other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the technical features mentioned in each embodiment can be combined in any way to form corresponding implementable technical solutions.

[0031] Unless otherwise defined, the technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the use of related terms herein is merely for the purpose of describing particular embodiments and is not intended to limit this application.

[0032] Unless otherwise specified, the reagents, instruments, and equipment used in this invention are all commonly used by those skilled in the art, and the testing standards all use national or international standards commonly used in the field, without further explanation.

[0033] The specifications and purity of some of the raw materials used in the following examples and comparative examples are shown in Table 1.

[0034] Table 1: Raw Material Specifications and Purity

[0035] Example 1 This embodiment provides a fuel for replacing gasoline in engines and a method for preparing the same. The raw materials, by weight, include: 76.0 parts of methanol, industrial grade anhydrous methanol, purity 99.8%, water content 0.1%; Light petroleum naphtha 14.0 parts, distillation range 30~120℃, sulfur content less than 10ppm; The composite cosolvent, 5.0 parts, is composed of tert-butanol, dimethyl carbonate, and alkyl glycoside APG1214 in a mass ratio of 5:3:2. The composite corrosion inhibitor is 1.2 parts, which is composed of benzotriazole, organic amine ester and fatty amine in a mass ratio of 1:2:0.08, wherein the organic amine ester is triethanolamine oleate and the fatty amine is oleylamine. 2.5 parts of the composite energy enhancer is a mixture of isooctyl nitrate and polymethoxydimethyl ether DMM3-5 in a mass ratio of 1:2.5; 0.8 parts of cold start aid, which is petroleum ether; 0.4 parts of lubricant, which is polyetheramine D2000; The antioxidant is 0.1 parts, which is 2,6-di-tert-butyl-p-cresol.

[0036] The preparation method includes the following steps: S1. The methanol is dehydrated by passing it through a 3A molecular sieve adsorption tower to control the water content of the methanol after dehydration to 0.1%; the naphtha is filtered to remove impurities by passing it through a filter with a pore size of 5μm.

[0037] S2. The weighed composite cosolvent, composite corrosion inhibitor, composite energy enhancer, cold start aid, lubricant and antioxidant are added to the stirred tank in sequence. Under normal temperature and pressure conditions, the mixture is stirred at a speed of 400 r / min for 18 min until all components are completely dissolved and mixed evenly to obtain the additive mother liquor.

[0038] S3. First, add the naphtha treated in S1 to the stirred tank, then add the methanol treated in S1, start stirring, and then slowly add the additive mother liquor prepared in S2 to the stirred tank. The stirring speed is controlled at 600 r / min and stirred for 25 min until the mixture is completely clear and transparent. The above clear mixture is processed by a high-speed shear homogenizer, with the homogenization linear velocity controlled at 20 m / s and the processing time at 12 min. Finally, the homogenized fuel is allowed to stand and age for 3 hours, and then filtered through a filter with a pore size of 2 μm. The resulting filtrate is the finished fuel.

[0039] Example 2 This embodiment provides a fuel for replacing gasoline in engines and a method for preparing the same. The raw materials, by weight, include: 83.0 parts of methanol, industrial grade anhydrous methanol, purity 99.5%, water content 0.15%; Light petroleum naphtha 8.0 parts, distillation range 30~120℃, sulfur content less than 10ppm; The composite cosolvent, 4.0 parts, is composed of tert-butanol, dimethyl carbonate, and alkyl glycoside APG0810 in a mass ratio of 5:2.5:1.5. The composite corrosion inhibitor is 1.5 parts, which is composed of benzotriazole, organic amine ester and fatty amine in a mass ratio of 1:2.2:0.07, wherein the organic amine ester is cycloalkanoic acid amine ester and the fatty amine is octadecylamine; 2.0 parts of the composite energy enhancer is a mixture of isooctyl nitrate and polymethoxydimethyl ether DMM3-5 in a mass ratio of 1:3; 1.0 part of cold start aid, which is petroleum ether; 0.4 parts of lubricant, which is polyetheramine D2000; The antioxidant is 0.1 parts, which is 2,6-di-tert-butyl-p-cresol.

[0040] The preparation method includes the following steps: S1. The methanol is dehydrated by passing it through a 3A molecular sieve adsorption tower to control the water content of the methanol after dehydration to 0.15%; the naphtha is filtered to remove impurities by passing it through a filter with a pore size of 5μm.

[0041] S2. The weighed composite cosolvent, composite corrosion inhibitor, composite energy enhancer, cold start aid, lubricant and antioxidant are added to the stirred tank in sequence. Under normal temperature and pressure conditions, the mixture is stirred at a speed of 300 r / min for 20 min until all components are completely dissolved and mixed evenly to obtain the additive mother liquor.

[0042] S3. First, add the naphtha treated in S1 to the stirred tank, then add the methanol treated in S1, start stirring, and then slowly add the additive mother liquor prepared in S2 to the stirred tank. The stirring speed is controlled at 500 r / min and stirred for 30 min until the mixture is completely clear and transparent. The above clear mixture is processed by a high-speed shear homogenizer, with the homogenization linear velocity controlled at 15 m / s and the processing time at 15 min. Finally, the homogenized fuel is allowed to stand and age for 4 hours, and then filtered through a filter with a pore size of 2 μm. The resulting filtrate is the finished fuel.

[0043] Example 3 This embodiment provides a fuel for replacing gasoline in engines and a method for preparing the same. The raw materials, by weight, include: 72.0 parts of methanol, industrial grade anhydrous methanol, purity 99.9%, water content 0.08%; Light petroleum naphtha 18.0 parts, distillation range 30~120℃, sulfur content less than 10ppm; The composite cosolvent, in 5.5 parts, is composed of tert-butanol, dimethyl carbonate, and alkyl glycoside APG1214 in a mass ratio of 6:2:1. The composite corrosion inhibitor is 1.2 parts, which is composed of benzotriazole, organic amine ester and fatty amine in a mass ratio of 1:1.8:0.06, wherein the organic amine ester is triethanolamine oleate and the fatty amine is oleylamine. 3.0 parts of composite energy enhancer is a mixture of isooctyl nitrate and polyoxymethylene dimethyl ether in a mass ratio of 1:2, wherein the polyoxymethylene dimethyl ether is DMM3-5; Cold start aid 0.6 parts, ether; 0.5 parts of lubricant, which is polyetheramine D2000; 0.2 parts of antioxidant, which is 2,6-di-tert-butyl-p-cresol.

[0044] The preparation method includes the following steps: S1. The methanol is dehydrated by passing it through a 3A molecular sieve adsorption tower to control the water content of the methanol after dehydration to 0.08%; the naphtha is filtered to remove impurities by passing it through a filter with a pore size of 5μm.

[0045] S2. The weighed composite cosolvent, composite corrosion inhibitor, composite energy enhancer, cold start aid, lubricant and antioxidant are added to the stirred tank in sequence. Under normal temperature and pressure conditions, the mixture is stirred at a speed of 500 r / min for 15 min until all components are completely dissolved and mixed evenly to obtain the additive mother liquor.

[0046] S3. First, add the naphtha treated in S1 to the stirred tank, then add the methanol treated in S1, start stirring, and then slowly add the additive mother liquor prepared in S2 to the stirred tank. The stirring speed is controlled at 700 r / min and stirred for 20 min until the mixture is completely clear and transparent. The above clear mixture is processed by a high-speed shear homogenizer, with the homogenization linear velocity controlled at 25 m / s and the processing time at 10 min. Finally, the homogenized fuel is allowed to stand and age for 2 hours, and then filtered through a filter with a pore size of 2 μm. The resulting filtrate is the finished fuel.

[0047] Comparative Example 1 This comparative example provides a fuel that differs from Example 1 only in that no composite co-solvent is added. All other aspects are the same as in Example 1 and will not be repeated here.

[0048] Comparative Example 2 This comparative example provides a fuel that differs from Example 1 only in that no composite corrosion inhibitor is added. All other aspects are the same as in Example 1 and will not be repeated here.

[0049] Comparative Example 3 This comparative example provides a fuel that differs from Example 1 only in that the composite cosolvent is composed of tert-butanol, dimethyl carbonate, and alkyl glycoside 1214 in a mass ratio of 1:1:8. All other aspects are the same as in Example 1 and will not be repeated here.

[0050] Comparative Example 4 This comparative example provides a fuel that differs from Example 1 only in that 92# gasoline is used instead of light naphtha. All other aspects are the same as in Example 1 and will not be repeated here.

[0051] Comparative Example 5 This comparative example provides a fuel that differs from Example 1 only in that no composite energy enhancer is added. All other aspects are the same as in Example 1 and will not be repeated here.

[0052] To verify the comprehensive performance of the alternative gasoline fuel described in this invention, Examples 1-3 were used as samples, and Comparative Examples 1-5 were used as control samples. Low-temperature stability, water resistance, metal corrosion resistance, cold start performance, octane number, calorific value and power performance, exhaust emissions, and storage stability were tested according to relevant national standards. The test methods are shown in Table 2.

[0053] Table 2: Test Methods and Test Standards

[0054] The low-temperature stability, water resistance, and cold start performance are shown in Table 3 below.

[0055] Table 3: Low-temperature stability, water resistance and cold start performance

[0056] Phase separation temperature is defined as the highest temperature at which the sample first appears cloudy or separates into layers. Examples 2, 4, and 5 remained clear and transparent at -30℃ and did not separate into layers even when the temperature was further lowered to -35℃, so they are recorded as ≤-30℃. Comparative Example 1 showed separation at 0℃ and Comparative Example 3 showed separation at -5℃. 92# gasoline is a pure hydrocarbon fuel and has no phase separation problem.

[0057] The results of the metal corrosion test are shown in Table 4 below.

[0058] Table 4: Results of Metal Corrosion Test

[0059] Comparative Example 2, lacking the addition of a composite corrosion inhibitor, exhibited severe corrosion; the other comparative examples, containing corrosion inhibitors, had normal corrosion levels.

[0060] Comparative Examples 1 and 3, due to the absence or imbalance of the added composite co-solvent, resulted in significant stratification of the fuel at low temperatures or upon contact with water, failing to form a homogeneous and stable system. Therefore, octane number, calorific value, and power performance tests would lack representativeness and repeatability, and could potentially damage the engine due to unstable fuel supply. Comparative Example 2, lacking the addition of a composite corrosion inhibitor, exhibited severe metal corrosion, failing to meet basic fuel safety requirements, and therefore no further performance testing was necessary. While Comparative Example 4's performance was reasonably expected to be close to that of 92# gasoline, its cost was significantly higher than the examples using naphtha, and it still relied on petroleum-based gasoline, failing to demonstrate the raw material substitution advantages of this invention; therefore, it was not tested. Thus, this invention only conducted basic fuel performance tests on Examples 1-3 and Comparative Example 5, which met the basic conditions of homogeneity, stability, and corrosion compliance. The results are as follows... Figures 1-2 And as shown in Table 5 below.

[0061] Table 5: Basic Fuel Properties

[0062] The fuel in this example has an octane rating of RON ≥ 97.6, excellent anti-knock performance, a lower calorific value of 40.5~41.8 MJ / kg, and a power retention rate of ≥ 95%.

[0063] Emissions testing requires fuel to operate stably in the engine for an extended period, thus placing basic requirements on fuel homogeneity, corrosion inhibition, and power performance. However, most comparative examples exhibit critical deficiencies. Comparative examples 1 and 3 cannot guarantee stable fuel supply due to low-temperature stratification; comparative example 2 may damage the engine due to severe corrosion; comparative example 4 is too costly; and comparative example 5 was not tested for emissions due to decreased power performance. Similarly, storage stability testing requires samples to remain homogeneous during storage; stratified samples cannot be evaluated. Therefore, this invention uses 92# gasoline as the reference fuel and only tests examples that meet the basic conditions of homogeneity, corrosion resistance, and usable power. The results are shown in Table 6 below.

[0064] Table 6: Results of Exhaust Gas Emissions and Storage Stability Tests

[0065] In summary, the present invention provides a fuel for replacing gasoline in engines. Through a main compound of methanol and naphtha, combined with the synergistic effects of multiple components including a composite cosolvent, composite corrosion inhibitor, composite power enhancer, cold start aid, lubricant, and antioxidant, it successfully solves the long-standing defects of high-proportion methanol fuels, such as low-temperature stratification, metal corrosion, difficulty in cold starting, and insufficient power. The resulting fuel remains homogeneous and transparent at ≤-30℃, exhibits excellent water resistance, achieves a copper strip corrosion rating of 1a, has a cold start time of ≤2.1s at -10℃, a research octane number (RON) ≥97.6, a power retention rate ≥95%, and low CO, HC, and NO emissions in the exhaust gas. x It exhibits significantly lower particulate matter content compared to 92# gasoline, and remains undeteriorated after 90 days of sealed storage at room temperature, meeting the performance requirements for gasoline engines. Furthermore, this fuel has a wide availability of raw materials, low cost, and superior environmental performance, effectively alleviating pressure on petroleum resources and possessing promising prospects for industrialization.

[0066] 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 preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the technical solutions of the present invention, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A fuel for replacing gasoline in engines, characterized in that: By weight, it includes the following ingredients: Methanol 70-90 parts, naphtha 8-25 parts, composite cosolvent 3-8 parts, composite corrosion inhibitor 0.5-2.5 parts, composite energy enhancer 2-5 parts, cold start aid 0.5-2 parts, lubricant 0.2-1 parts, antioxidant 0.05-0.2 parts.

2. The fuel for replacing gasoline in engines according to claim 1, characterized in that: Naphtha is a light petroleum naphtha with a distillation range of 30~120℃.

3. The fuel for replacing gasoline in engines according to claim 1, characterized in that: The composite cosolvent is composed of tert-butanol, dimethyl carbonate and alkyl glycoside in a mass ratio of (4~6):(2~3):(1~2), wherein the alkyl glycoside is an alkyl glycoside with a carbon chain length of C8~C14 and an HLB value of 12~16.

4. A fuel for replacing gasoline in engines according to claim 1, characterized in that: The composite corrosion inhibitor is composed of benzotriazole, organic amine ester and fatty amine in a mass ratio of 1:(1.5~2.5):(0.05~0.1); wherein the organic amine ester is oleic acid triethanolamine ester or naphthenic acid amine ester with an amine value of 150~250mg KOH / g, and the fatty amine is oleylamine or octadecylamine.

5. A fuel for replacing gasoline in engines according to claim 1, characterized in that: The composite energy enhancer is a mixture of isooctyl nitrate and polymethoxydimethyl ether in a mass ratio of 1:(2~3); wherein, the polymethoxydimethyl ether is DMM3-5.

6. A fuel for replacing gasoline in engines according to claim 1, characterized in that: The cold start aid is diethyl ether or petroleum ether; the lubricant is polyetheramine; and the antioxidant is 2,6-di-tert-butyl-p-cresol.

7. A fuel for replacing gasoline in an engine according to claim 6, characterized in that: The number average molecular weight of polyetheramine is 1000~2000 and the amine value is ≥200mg KOH / g.

8. A method for preparing a fuel to replace engine gasoline as described in any one of claims 1-7, characterized in that: Includes the following steps: S1. Dehydrate the methanol to a water content ≤0.2%, and filter the naphtha to remove impurities; S2. Mix the composite cosolvent, composite corrosion inhibitor, composite energy enhancer, cold start aid, lubricant and antioxidant according to the ratio to obtain the additive mother liquor. S3. Add naphtha and methanol to a stirring vessel, then add the additive mother liquor, stir and mix until clear, then age for 2-4 hours after high-speed shear homogenization treatment, and filter to obtain the finished product.

9. A method for preparing a fuel to replace engine gasoline according to claim 8, characterized in that: In step S3, the stirring speed is 500~700 r / min, the stirring time is 20~30 min; the homogenization linear velocity is 15~25 m / s, and the processing time is 10~15 min.

10. A method for preparing a fuel to replace engine gasoline according to claim 8, characterized in that: In step S3, the filter screen used for filtration has a pore size of 1~3μm.

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