CN114806651B

CN114806651B - Modified alcohol-based composite environment-friendly fuel

Info

Publication number: CN114806651B
Application number: CN202210511746.3A
Authority: CN
Inventors: 陈记; 路新龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-05-12
Filing date: 2022-05-12
Publication date: 2023-07-14
Anticipated expiration: 2042-05-12
Also published as: CN114806651A

Abstract

The invention provides a modified alcohol-based composite environment-friendly fuel with better dynamic performance and fuel economy; when the alcohol-based fuel is used for an in-cylinder direct injection gasoline engine, problems of carbon deposition, particulate matters generation and the like in the cylinder are remarkably improved, the engine maintenance requirement and the maintenance cost are reduced, and the exhaust system is basically not blocked by a particle catcher which needs special carbon burning regeneration due to the alcohol-based fuel when the particle catcher is assembled; the adopted atomized combustion control agent is easy to purchase or prepare, and the technical effects of reducing carbon deposition in a cylinder, reducing the generation amount of particulate matters and the like are achieved on the basis of lower addition amount. The modified alcohol-based composite environment-friendly fuel is suitable for direct injection engines in cylinders and multi-point electronic injection engines with an air inlet manifold, comprises self-priming and exhaust gas turbocharging, and/or gasoline engines with an accurate valve control technology, particularly low-displacement gasoline engines with the discharge capacity being less than 1.6L, and has good market prospect.

Description

Modified alcohol-based composite environment-friendly fuel

Technical Field

The invention belongs to the technical field of clean fuel oil, and particularly relates to a modified alcohol-based composite environment-friendly fuel.

Background

At present, the oil supply mode of the gasoline engine for the vehicle mainly comprises multipoint electric injection of an intake manifold and direct injection in a cylinder.

Compared with multi-point electronic injection, the in-cylinder direct injection technology mainly injects gasoline in a cylinder at a shorter time before and after ignition of a spark plug, and mixes the gasoline with air directly in the cylinder, so that the control and the matching of the injection time, the injection quantity and the ignition time are more accurate and flexible, the stratified combustion and the lean combustion with higher power efficiency and higher heat efficiency are realized under the conditions of high air-fuel ratio and high compression ratio, and the matching and the effect with complex air distribution conditions are easy to realize, thereby obviously improving the power performance of an engine such as power rise and maximum torque, especially low-speed torque, and reducing the oil consumption, and the application is gradually increased. The engine is effectively combined with an exhaust gas turbocharging technology and a valve control technology, so that high power performance and fuel economy of the engine are well realized, and the installed ratio of a low-displacement gasoline engine adopting an in-cylinder direct injection technology is higher and higher. However, the defects of easy carbon deposition, high particle generation and the like existing in the direct injection technology in a gasoline engine cylinder are still difficult to overcome, and are far more serious than the defects of the direct injection technology in a multi-point electronic injection technology, so that the engine maintenance requirements and the maintenance cost are high, the exhaust systems of many engines are also provided with particle traps, and the particle traps generally need to be regenerated by burning carbon; these problems cause a lot of inconvenience and trouble to the vehicle user.

The low-proportion methanol gasoline for vehicles, such as the formula and the M15 methanol gasoline prepared properly, can directly replace the conventional gasoline with the same grade, and has certain advantages in the aspects of fuel economy and tail gas emission. However, the low-proportion methanol gasoline for vehicles in the prior art, such as M15, is mostly developed based on the mainstream multi-point electronic injection technology and the engine exhaust emission standard at that time in ten years ago, and even if the blending component oil which accords with the national six-gasoline standard is changed, the improvement range of the defects of easy carbon deposition, high particle production and the like of the direct injection technology in a cylinder is limited, the engine maintenance requirement and the maintenance cost are still higher, and the exhaust system still always needs special carbon burning regeneration when being equipped with a particle catcher; that is, these low-ratio vehicular methanol gasoline are not well suited for the current mass-application in-cylinder direct injection technology engine, and are even less suited for the current mass-application exhaust gas turbocharging + in-cylinder direct injection low-displacement gasoline engines, such as 1.6L or less, which have insignificant advantages in terms of fuel economy and engine maintenance and some of the contained additives are disabled or are harder to purchase, thus not being easy to continue production and gaining market acceptance, compared with the conventional gasoline adopting the current national sixth standard.

On the other hand, the low-proportion methanol gasoline for vehicles in the prior art has the main component of gasoline blending component oil, and has the problems of higher cost, lower fuel economy and the like under the market condition of high crude oil price.

Disclosure of Invention

In order to solve the technical problems, the invention provides the modified alcohol-based composite environment-friendly fuel with better power performance and fuel economy; when the alcohol-based fuel is used for an in-cylinder direct injection gasoline engine, including an in-cylinder direct injection engine with exhaust gas turbocharging and/or accurate valve control technology, problems of carbon deposition, particulate generation and the like in the cylinder are remarkably improved, the maintenance requirement and the maintenance cost of the engine are reduced, and the exhaust system is basically free from the blockage of a particle catcher which needs special carbon burning regeneration due to the alcohol-based fuel when the particle catcher is assembled; compared with the prior art low-proportion methanol gasoline for vehicles, which accords with the six standards of the current country and has the same grade as the conventional gasoline and similar methanol content, the methanol gasoline for vehicles has certain advantages; the adopted atomized combustion control agent is easy to purchase or prepare, and the technical effects of reducing carbon deposition in a cylinder, reducing the generation amount of particulate matters and the like are achieved on the basis of lower addition amount. The modified alcohol-based composite environment-friendly fuel can be widely applied to direct injection engines in cylinders with different discharge capacities, structures and control logics, is more applicable to multi-point electronic injection engines with inlet manifolds and low requirements on fuel quality and performance, is also applicable to double injection technology engines combining multi-point electronic injection and direct injection in cylinders of the inlet manifolds, comprises self-priming and turbocharging with waste gas, and/or has a gasoline engine with an accurate valve control technology, particularly a low-discharge gasoline engine with the discharge capacity of less than 1.6L, and has good market prospect.

The modified alcohol-based composite environment-friendly fuel comprises, by weight, 10-40% of methanol, 5-10% of palm oil, 0.1-0.5% of an atomized combustion control agent, 0.02-0.1% of a metal corrosion inhibitor, 0.02-0.2% of a rubber expansion inhibitor and the balance solvent oil; the sulfur content of the solvent oil is less than or equal to 10mg/kg, and is No. 1-4 solvent oil conforming to GB 1922-2006; the control agent for atomized combustion comprises polymethylphenyl ethanol ((CH) ₃ ) _X -C ₆ H _6-X-1 )-CH ₂ -CH ₂ -OH, polymethylphenyl ethyl ether ((CH) ₃ ) _X -C ₆ H _6-X-1 )-O-CH ₂ -CH ₃ The weight ratio of (2) is 50-75:5-15, wherein, the weight of the polymethylphenyl ethanol and the polymethylphenyl ethyl ether is more than or equal to 60 percent, and X=2 or 3; the polymethylphenyl group is an o-dimethylphenyl group, i.e., 1, 2-dimethylphenyl, or an m-dimethylphenyl group, i.e., 1, 3-dimethylphenyl, when x=2, and the-CH when the polymethylphenyl group is an o-dimethylphenyl group ₂ -CH ₂ -OH or-O-CH ₂ -CH ₃ The linkage position to the benzene ring is 4-position, and when the polymethylphenyl group is m-dimethylphenyl, the-CH ₂ -CH ₂ -OH or-O-CH ₂ -CH ₃ The connection position with the benzene ring is 5; the polymethylphenyl group is a mesityl group, i.e., 1,2, 3-mesityl group, or a meta-mesityl group, i.e., 1,2, 4-mesityl group, when x=3, in which case the-CH ₂ -CH ₂ -OH or-O-CH ₂ -CH ₃ The connection positions with the benzene ring are all 5 positions.

In the atomized combustion control agent, the weight ratio of the polymethylphenyl ethanol to the polymethylphenyl ethyl ether is preferably 58-63:8.

the atomized combustion control agent can be the mixture of the polymethylphenyl ethanol and the polymethylphenyl ethyl ether, but the production amount of the two chemicals of the polymethylphenyl ethanol and the polymethylphenyl ethyl ether is lower and the price is higher at present, and no report on the use as the fuel additive for the vehicle exists. In order to control the cost and purchasing difficulty, the polymethylphenyl ethanol and the polymethylphenyl ethyl ether contained in the mixture can be prepared from one or more polymethylbenzene selected from o-xylene, m-xylene, mesitylene and pseudocumene, or aromatic hydrocarbon oil containing more than 80wt% of the polymethylbenzene, and can be used as raw materials of the polymethylphenyl and can generate the-CH at the connecting position of the phenyl ₂ -CH ₂ -OH、-O-CH ₂ -CH ₃ Is synthesized by direct reaction of a suitable starting material such as ethylene oxide. Components other than the polymethylbenzene in the hydrocarbon oil should not affect the reaction of the polymethylphenyl group with ethylene oxide to produce the polymethylphenyl ethanol and the polymethylphenyl ethyl ether.

The polymethylphenyl ethanol and the polymethylphenyl ethyl ether with the weight ratio are synthesized by reacting the polymethylbenzene or hydrocarbon oil containing more than 80 weight percent of the polymethylbenzene with ethylene oxide, and one preparation method is as follows: mixing one or more of o-xylene, m-xylene, mesitylene and mesitylene or aromatic hydrocarbon oil containing more than 80wt% of the poly-toluene with ethylene oxide according to a required proportion, adding a powdery Pt/HZSM-5 molecular sieve catalyst, reacting at 30-40 ℃ under stirring for 8-20h under a liquid phase condition, separating the Pt/HZSM-5 molecular sieve catalyst after the reaction until the ethylene oxide is completely converted, and obtaining the catalyst containing 50-75:5-15 of polymethylphenyl ethanol, polymethylphenyl ethyl ether and the residual polymethylbenzene or the reaction generating solution of the aromatic hydrocarbon oil residual material; the dosage of the Pt/HZSM-5 molecular sieve catalyst in the reaction is 3 to 10 weight percent of the liquid dosage of the polymethylbenzene and the ethylene oxide. The Pt/HZSM-5 molecular sieve catalyst is provided by Shandong Xingxing new material science and technology Co-Ltd of the related company of the applicant, wherein the Pt content is 0.05-0.1wt%, is basically loaded into a pore canal in a crystal grain of the HZSM-5 molecular sieve by a cation exchange method, and is obtained by reducing and drying hydrazine hydrate; the HZSM-5 molecular sieve has a silicon-aluminum ratio of 60-120, is a crystal rather than a microcrystalline aggregate, has a relative crystallinity higher than 95%, has a grain number of 0.8-5 μm in an overall dimension of more than 95% and less than 1% of the total grain number, and has two main pore sizes of 0.53 x 0.56 and 0.51 x 0.55nm. The preparation method of the catalyst is shown in CN201910196183.1. The reaction is carried out to charge the polymethylbenzene, the ethylene oxide and the aromatic hydrocarbon oil containing more than 80 weight percent of the polymethylbenzene, and the aromatic hydrocarbon oil does not contain components which are toxic to the catalyst, especially the highly dispersed metal Pt, for example, the sulfur content is less than or equal to 1ppm.

The feeding ratio of the amount of the polymethylbenzene contained in the polymethylbenzene or the aromatic hydrocarbon oil to the amount of the ethylene oxide substance is 100: the reaction effect is better at 50-75, wherein 100:60-70, and the selectivity of the corresponding polymethylphenyl ethanol and polymethylphenyl ethyl ether in the reaction product is more than or equal to 99 percent based on the feeding of ethylene oxide, the selectivity of the polymerization product of ethylene oxide in the byproducts is less than or equal to 0.1 percent (the products are dimeric ether alcohol and tripholyether alcohol through ring-opening polymerization, and no more than four ether alcohol products are detected). The aromatic hydrocarbon oil can contain a small amount of toluene, ethylbenzene, propylbenzene, para-xylene, mesitylene and diethylbenzene, and the aromatic hydrocarbon is less reacted with ethylene oxide under the Pt/HZSM-5 molecular sieve catalyst and the reaction condition due to the limitation of the reactivity, steric hindrance or the pore size of molecular sieve particles. The 4-position hydrogen and the 5-position hydrogen of the phenyl in the polymethylbenzene have higher reactivity in the pore canal of the Pt/HZSM-5 molecular sieve catalyst, and react with ethylene oxide to generate polymethylphenyl ethanol and polymethylphenyl diethyl ether with the proportion.

The reaction product liquid can be directly used for preparing the atomized combustion control agent; or removing more than 80% of residual polymethylbenzene or aromatic hydrocarbon oil residual material by normal pressure or reduced pressure distillation, collecting polymethylphenyl ethanol and polymethylphenyl ethyl ether at the bottom of the distillation tower, and then preparing the atomized combustion control agent.

The Pt/H beta molecular sieve catalyst similar to the preparation method (provided by Shandong Juxing New Material science and technology Co., ltd., see CN201910196183.1 specifically, the main pore size of H beta molecular sieve crystal grain is 0.56-0.75nm, the silicon-aluminum ratio is 40-100) has slightly poorer effect when being used for the reaction, the yield of the polymethyl phenyl ethyl ether is larger, the byproducts with larger molecular weight are obviously increased, the ratio of the polymethyl phenyl ethyl alcohol and the polymethyl phenyl ethyl ether is not easy to obtain, and the main reason is that the acid strength and the acid center number of the H beta molecular sieve are obviously higher than those of the HZSM-5 molecular sieve, the size of the pore canal in the crystal grain is larger, and the epoxy ethane is easier to react.

In the modified alcohol-based composite environment-friendly fuel, the content ratio of methanol to an atomized combustion control agent is preferably 100:1.0-2.0.

The solvent oil No. 1-4 is selected and specifically blended according to the methanol blending amount and the octane number requirement of the prepared alcohol-based fuel; specifically, the solvent oil can be one or two of solvent oil No. 1 and No. 2, and one or two of solvent oil No. 3 and No. 4.

The components of the metal corrosion inhibitor and the rubber expansion inhibitor meet the related technical requirements of the methanol gasoline additive for the GB/T34548-2017 vehicle, and the addition amount of the metal corrosion inhibitor and the rubber expansion inhibitor can enable the prepared alcohol-based fuel to meet the related local standard requirements of the operation area. One of the metal corrosion inhibitors is a mixture of benzotriazole and pyridone in a weight ratio of 3-6:1. The rubber expansion inhibitor can be JH4012 of Sean Jia macro technology Co.

The methanol comprises vehicle fuel methanol conforming to GB/T23510-2009, or qualified products, first-class products or superior products of GB/T338-2011 industrial methanol.

In the modified alcohol-based composite environment-friendly fuel, the polymethylphenyl ethanol polymethylphenyl ethyl ether and diethyl malonate of the atomization combustion control agent are not methylal, anilines, halogens, phosphorus-containing, iron-containing, silicon-containing and other harmful forbidden compounds specified in the current standards of automotive gasoline, methanol gasoline and ethanol gasoline; the specific addition amount depends on the composition and performance of the solvent oil and the requirements on carbon deposit resistance, particulate matter inhibition, labeling, stability and the like of the formulated alcohol-based fuel, wherein the stability comprises the layering temperature/cloud point of the alcohol-based fuel, the storage time under different temperature conditions and the tolerance on the water content of methanol or the water absorption capacity of the alcohol-based fuel.

From the test results and specific application effect conditions of the alcohol-based fuel in the following examples and comparative examples, and by combining technical experience of the inventor, the following dosing principle of the modified alcohol-based composite environment-friendly fuel is deduced.

1. The atomization combustion control agent contains the polymethylphenyl ethanol and the polymethylphenyl ethyl ether, the polarity and the surface tension of the polymethylphenyl ethanol and the polymethylphenyl ethyl ether are between the stronger methanol and weaker solvent oil components, the stability of the alcohol-based fuel is improved, the layering degree/cloud point of the alcohol-based fuel is lower, the storage time is longer, the water content of the methanol is allowed to be not more than 0.5wt%, and the water content of the alcohol-based fuel is not more than 0.3 wt%.

2. The atomization combustion control agent contains the polymethylphenyl ethanol and the polymethylphenyl diethyl ether, improves the atomization capability of alcohol-based fuel, and obviously increases the fineness of oil mist droplets obtained by direct injection in a cylinder and obviously reduces the average outer diameter, so that the oil mist droplets can volatilize more quickly, the surfaces of a spark plug, an oil nozzle and the inner wall and the piston surface at the upper part of the cylinder are not easy to wet, the combustion performance is obviously improved, and the generated carbon particles are obviously refined. Adverse effects between the atomized combustion control agent and the metal corrosion inhibitor and the rubber expansion inhibitor are not found in the examples and the application examples.

3. The polymethylphenyl ethanol contained in the atomized combustion control agent has a certain antiknock effect, namely an octane number improving effect, can improve the octane number of the alcohol-based fuel on the premise of basically not changing the composition of the solvent oil and other technical indexes, reduces the peroxide concentration formed in the combustion process of the solvent oil, reduces the combustion speed of oil mist microdroplets, promotes the full combustion of the solvent oil and palm oil, and especially ensures that aromatic hydrocarbon components contained in the solvent oil and palm oil are fully combusted, and the antiknock effect or the octane number improving effect of the atomized combustion control agent is coordinated with the antiknock effect or the octane number improving effect of methanol to a certain extent, so that the combustion of the alcohol-based fuel in the operation process of the direct injection engine in a cylinder is more stable and full, the generation amount of carbon particles is obviously reduced, combustion carbon deposition in the cylinder is facilitated to be removed, the maintenance period and the service life of the engine are prolonged, and the emission amount of pollutants in tail gas is lower; therefore, the material selection range of the solvent oil can be widened to a certain extent.

4. The polymethylphenyl ethyl ether and the palm oil contained in the atomized combustion control agent can improve the peroxide concentration formed in the combustion process of the solvent oil to a certain extent, so that the combustion speed of oil mist microdroplets is moderate, the reduction effect on the combustion speed of the oil mist microdroplets when the using amount of the polymethylphenyl ethyl alcohol is more is properly controlled, and the atomized combustion control agent has a certain positive effect on ensuring the stable and full combustion of the solvent oil and the palm oil in the stratified combustion and the lean combustion process, in particular the stable and full combustion of aromatic hydrocarbon contained in the solvent oil and the palm oil.

5. The combined action of the principles 2-4 obviously reduces the carbon deposition generation speed of the spark plug, the oil nozzle surface, the inner wall of the upper part of the cylinder and the top surface of the piston, obviously reduces the quantity of the generated particles, and reduces the size, namely refines the size, so that the generation weight of the particles is greatly reduced, and the particles are easy to burn off when the exhaust system is provided with the particle catcher, so that the blockage of the particle catcher which is required to be specially regenerated by burning carbon is basically avoided; the surface of the spark plug, the surface of the oil nozzle and the inner wall of the upper part of the cylinder and the top surface of the piston are also cleaned and removed to a certain extent.

6. The combined action of the principles 2-4 ensures that the combustion process of the alcohol-based fuel in the engine is stable and sufficient, the applicability of the alcohol-based fuel in the new and old gasoline engines with turbo-charging, direct injection in a cylinder, natural suction, direct injection in a cylinder, turbo-charging, multi-point electric injection of an air inlet manifold, natural suction, multi-point electric injection of an air inlet manifold and different discharge capacities is good, the noise and the oil consumption of the engine are low, and the fuel economy is high; the sulfur content of the methanol and the palm oil is extremely low, and the solvent oil with the sulfur content less than or equal to 10mg/kg is adopted, SO that the exhaust emission of the engine is very environment-friendly, HC, CO and SO ₂ The concentration of NOx and particulate matters is low, the requirement on the treatment effect of the three-way catalytic tail gas is reduced, and the particulate trap is not easy to block when being matched.

Detailed Description

The present invention is specifically described below by way of examples, which are not to be construed as limiting the invention.

Examples 1 to 7, comparative examples 1 to 2

Aromatic hydrocarbon solutions containing polymethylphenyl ethyl alcohol and polymethylphenyl ethyl ether of examples 1 to 7 and comparative examples 1 to 2 were prepared according to the raw material ratios in table 1.

Examples 1-7 were operated as follows: in a fume hood, a 1000mL stainless steel small-sized reaction kettle with a jacket is filled with circulating ice water after nitrogen gas is tested and replaced, the temperature in the kettle is reduced to below 5 ℃, aromatic hydrocarbon or aromatic hydrocarbon oil and ethylene oxide with the temperature of 0-5 ℃ are added, stirring is started, 22g of Pt/HZSM-5 molecular sieve catalyst (about 5wt% of the feeding amount of aromatic hydrocarbon or aromatic hydrocarbon oil plus ethylene oxide) is added after 5min, the reaction kettle is sealed, the jacket is filled with circulating water with the temperature of 32 ℃, and the temperature in the kettle is controlled to be 30-32 ℃ for reaction; sampling 0.5mL for preservation every 1h in the reaction process, detecting by gas chromatography, stopping stirring for 5min before sampling, settling the catalyst, stopping stirring after detecting the residual of the ethylene oxide, pumping out all the feed liquid, separating the liquid and the catalyst by a sand core funnel, filling the obtained liquid product into a small-mouth reagent bottle, capping and numbering for storage, washing the catalyst with 200-220mL of o-xylene for three times, performing suction filtration, and sealing and storing by a bag or directly using the catalyst for the reaction of the next kettle.

Comparative example 1-1 the same raw material ratio, pt/HZSM-5 molecular sieve catalyst and operation procedure as in example 1 were adopted, except that the jacket was changed to 52 ℃ circulating water after the reaction vessel was closed, and the temperature in the vessel was controlled to 50-52 ℃ for reaction.

Comparative examples 1-2 the same raw material ratios and operation procedures as in example 1 were employed, except that 22g of Pt/hβ molecular sieve catalyst was used for the reaction, the temperature of the circulating water introduced into the jacket after the reaction vessel was closed was 32 ℃, and the reaction temperature in the vessel was controlled to be constant at 30-32 ℃.

The powdery Pt/HZSM-5 molecular sieve catalyst is prepared by the method of example 1 of CN201910196183.1 provided by Shandong Juxing New Material science and technology Co., ltd, has Pt content of 0.062wt%, is basically loaded into the intra-grain pore canal of the HZSM-5 molecular sieve by a cation exchange method, and is obtained by reducing and drying hydrazine hydrate; the HZSM-5 molecular sieve has a Si/Al ratio of 60, is crystal rather than microcrystal aggregate, has a relative crystallinity of 96% and an external dimension of 0.8-5 μmThe number of the crystal grains accounts for 98.4 percent of the total number of the crystal grains, less than 0.6 percent of the total number of the crystal grains, the two main pore canal sizes of the crystal grains are respectively 0.53 to 0.56 and 0.51 to 0.55nm, and the specific surface area is 380m ² Per gram, the external surface area of the crystal grain is 0.85m ² /g。

The powdery Pt/H beta molecular sieve catalyst is prepared by a method provided by Shandong Juxing New Material science and technology Co., ltd, according to an example 5 of CN201910196183.1, wherein the Pt content is 0.063wt%, is basically loaded into a pore canal in a grain of the H beta molecular sieve by a cation exchange method, and is obtained by reducing and drying hydrazine hydrate; the H beta molecular sieve has Si/Al ratio 40, relative crystallinity of 95%, crystal grain size of 0.8-5 μm of 97.4% and specific surface area 563m below 0.5 μm ² Per gram, the external surface area of the crystal grain is 0.95m ² /g。

The o-xylene, m-xylene, mesitylene, pseudocumene and ethylene oxide are all analytically pure (sulfur content is less than or equal to 1 ppm); the aromatic hydrocarbon oil A, B, C is prepared from two additional analytically pure toluene and ethylbenzene (the sulfur content is less than or equal to 1 ppm) in analytically pure o-xylene, m-xylene, mesitylene and mesitylene according to the mass ratio of 45:45:5:5, wherein the aromatic hydrocarbon oil A is prepared from o-xylene, m-xylene, toluene and ethylbenzene, the aromatic hydrocarbon oil B is prepared from m-xylene, mesitylene, toluene and ethylbenzene, and the aromatic hydrocarbon oil C is prepared from o-xylene, mesitylene, toluene and ethylbenzene.

Table 1 reaction feed ratio, mol unit

。

In the preparation process of the above examples 1 to 7, the reaction time when the reaction liquid was examined to have no ethylene oxide remained was 10 to 13 hours.

By comparison with the peak time of the analytically pure material, the judgment is considered that: the reaction products of examples 1 to 7 fully illustrate the reaction and effect of the polymethylbenzene with ethylene oxide described in the summary of the invention. Example 1-CH in the target reaction product of o-xylene with ethylene oxide ₂ -CH ₂ -OH or-O-CH ₂ -CH ₃ The connection position with the 1, 2-dimethylphenyl is the 4-position of the benzene ring, and the chemical names are respectively 4- (1, 2-dimethylphenyl) -2-ethanol and 4- (1, 2-dimethylphenyl) -diethyl ether; EXAMPLE 3-CH in the target reaction product of mesitylene and ethylene oxide ₂ -CH ₂ -OH or-O-CH ₂ -CH ₃ The connection position with the 1,2, 3-trimethylphenyl is the 5-position of benzene ring, and the chemical names are respectively 5- (1, 2, 3-triphenyl) -2-ethanol and 5- (1, 2, 3-trimethylphenyl) -diethyl ether; each of the liquid products obtained in examples 5 to 7 contained 4 kinds of polymethylphenyl ethanol and polymethylphenyl ethyl ether, which were respectively contained in the same manner as the target reaction products obtained in examples 1 to 4, but different from each other in terms of aromatic hydrocarbon composition.

The liquid products obtained in examples 1-7 were clear and transparent, and the weight ratio of the target products of the detection of the mixture of the polymethylphenyl ethanol and the polymethylphenyl ethyl ether was 58.5-61.3:8, calculating the ethylene oxide feeding, wherein the selectivity of the corresponding polymethylphenyl ethanol and polymethylphenyl ethyl ether is more than or equal to 99.2 percent, and the selectivity of the polymerization product of the ethylene oxide is less than or equal to 0.1 percent (the polymerization product is the di-polyether alcohol and the tri-polyether alcohol, and no more than four polyether alcohol products are detected); the liquid products obtained in examples 5-7 had selectivity to methyl phenyl ethanol, methyl phenyl ethyl ether, ethyl phenyl ethanol, ethyl phenyl ethyl ether of less than or equal to 0.2% based on the ethylene oxide feed.

In each liquid product prepared in the examples 1-4, the content of the polymethylphenyl ethanol and the polymethylphenyl ethyl ether is 72.6-73.5wt%, and the rest components are mainly xylene and trimethylbenzene which are not reacted, and no new aromatic hydrocarbon is detected to be generated outside the feeding; the content of the polymethylphenyl ethyl alcohol and the polymethylphenyl ethyl ether in each of the liquid products prepared in examples 5 to 7 is 66.1 to 66.9wt%; the rest components mainly comprise unreacted dimethylbenzene, trimethylbenzene, toluene and ethylbenzene, and no new aromatic hydrocarbon is detected to be generated outside the feeding.

In the preparation process of comparative example 1, the reaction time of the reaction liquid for detecting the residual of the ethylene oxide is 5 hours; the liquid product obtained contained o-dimethylphenylethanol, i.e. 4- (1, 2-dimethylphenyl) -2-ethanol, and o-dimethylphenylether, i.e. 4- (1, 2-dimethylphenyl) -diethyl ether, in a weight ratio of 60:22, calculated by ethylene oxide feeding, the selectivity of the o-dimethylphenylethanol and the o-dimethylphenylether is 90.5 percent, and the selectivity of the polymerization product of the ethylene oxide is 8.9 percent (the polymerization product is di-polyether alcohol, trimeric ether alcohol, tetra-polyether alcohol, pentapolyether alcohol and hexapolyether alcohol, wherein the selectivity of the tetra-polyether alcohol, the pentapolyether alcohol and the hexapolyether alcohol is 4.6 percent).

In the preparation process of comparative example 2, the reaction time of the reaction liquid for detecting the residual of the ethylene oxide is 6 hours; the liquid product obtained contained o-dimethylphenylethanol, i.e. 4- (1, 2-dimethylphenyl) -2-ethanol, and o-dimethylphenylether, i.e. 4- (1, 2-dimethylphenyl) -diethyl ether, in a weight ratio of 60:30, calculated by ethylene oxide feeding, the selectivity of the o-dimethylphenylethanol and the o-dimethylphenylether is 96.1 percent, and the selectivity of a polymerization product of the ethylene oxide is 3.7 percent (the polymerization product is the polyether alcohol, the trimeric ether alcohol, the polyether alcohol and the polyether alcohol, wherein the selectivity of the polyether alcohol and the polyether alcohol is 1.4 percent).

Examples 8 to 22 and comparative examples 3 to 12

The solvent oils used in the preparation of the alcohol-based fuels of examples 8 to 22 and comparative examples 3 to 12 were prepared by mixing the solvent oils in the proportions shown in Table 2. The octane number (RON) of the obtained solvent oil M-Q is 88.5-90; the sulfur content of each solvent oil is less than or equal to 5mg/kg, and the other indexes meet the specification of GB1922-2006, wherein the solvent oil 1 is of a common type, the solvent oils 2 and 4 are of a medium aromatic type, and the solvent oil 3 is of a low aromatic type.

TABLE 2 composition of solvent naphtha M, N, O, P, Q per unit weight

。

40kg of alcohol-based fuels of examples 8 to 22 and comparative examples 3 to 12 were prepared according to the proportions shown in Table 3; wherein the methanol is qualified product of industrial methanol meeting GB/T338-2011, and the water content is less than or equal to 0.20wt%; the metal corrosion inhibitor is benzotriazole and pyridone mixture powder with the weight ratio of 4.5:1, and is ground to 600 meshes after being uniformly mixed; the rubber expansion inhibitor adopts JH4012 of the Western An Jiahong technology Co. The preparation process comprises the following steps: and after nitrogen replacement in a stirring tank, sequentially adding required amount of methanol, an atomization combustion control agent, a metal corrosion inhibitor and a rubber expansion inhibitor, stirring for 30min until powder is completely dissolved and uniformly mixed, and then adding palm oil and solvent oil, stirring for 30min until the mixture is uniformly mixed, thus obtaining the alcohol-based fuel.

The octane numbers (RON) of the alcohol-based fuels obtained in examples 8, 9, 19, 21, 22 and comparative example 12 were 92.3, 92.2, 95.5, 92.7, 95.4 and 93.6, respectively, and according to the practical experience of the applicant, the octane numbers (RON) of the alcohol-based fuels obtained in examples 10 to 18 and comparative examples 3 to 8 were higher than 92, and the octane numbers (RON) of the alcohol-based fuels obtained in examples 20 and comparative examples 9 to 11 were higher than 95.

Example 8, comparative example 12, made a significant difference in the octane number (RON) of the alcohol-based fuels, demonstrating that the antiknock effect, i.e., octane number boosting effect, of 4- (1, 2-dimethylphenyl) -2-ethanol in these two alcohol-based fuels was much lower than that of the prior art (CN 109929622B, an ethanol gasoline dispersant and ethanol gasoline containing the dispersant), 2- (p-methylphenyl) -2-butanol; the obvious differences of the alcohol-based fuels prepared in the example 8 and the comparative example 12 described in the application example 1 below in terms of engine oil consumption, noise level and idle speed also show that the atomization and combustion effects, namely the power effects, of 4- (1, 2-dimethylphenyl) -2-ethanol in the direct injection engines in the cylinders are obviously higher than those of 2- (p-methylphenyl) -2-butanol.

TABLE 3 alcohol based Fuel formulation

。

The alcohol-based fuels prepared in examples 8-22 were each subjected to stability testing, which included: (1) Each 500mL glass bottle is sealed under shading, and is placed for 30 days at the temperature of minus 20 ℃ and 30 ℃ respectively, and no visible change exists; (2) Each 500mL glass bottle is filled with 2mL water, and the glass bottles are uniformly mixed, shaded and sealed, and are respectively placed for 30 days at the temperature of minus 20 ℃ and 30 ℃ without visible change.

Application example 1

The alcohol-based fuels of examples 8-22 and comparative examples 3-12 were applied to a representative six-vehicle in sequence (the engine is a four-cylinder 1.5L turbo-charged and in-cylinder direct-injection, 7-speed wet double-clutch automatic gearbox with particle catcher and oil tank volume 55L), and each alcohol-based fuel was prepared 15-17 days before test use; and (5) examining the performance of each alcohol-based fuel in the aspects of engine power performance, oil consumption and noise. The vehicle is 20 months old, 35000km is run by using national standard No. 92 national six gasoline, 2200km is run by using national standard No. 92 national six gasoline, and 8000km is run by using No. 92M 15 and No. 95M 30 methanol gasoline respectively; before the test, SP-grade low-ash total synthetic engine oil with proper viscosity is adopted, the oil-gas separator is normal in effect, the engine state is good, engine oil is not burned, and carbon deposition in a checking cylinder, an air inlet manifold and the back surface carbon deposition of an air inlet valve are very slight. The test takes 3 months, and runs for 24000km altogether, wherein the former 6000km is firstly run by using national standard No. 92 national six gasoline 3800km, then is run by using national standard No. 95 national six gasoline 2200km, and then is run by using the alcohol-based fuels of examples 8-22 and comparative examples 2-11 18000km, wherein the alcohol-based fuels of example 8 and comparative example 5 are respectively replaced by more than 4 high-efficiency oil nozzles with more holes after the first test, and the original oil nozzles are replaced after the first test; the air temperature is 20-25 ℃ and the air speed is less than or equal to 6m/s during the test; the air quality of the driving route is high for most of time, and is good for less part of time, and slight or more haze does not occur and sand dust does not meet; the intake filter is replaced once every 4000km, the same engine oil is replaced once every 6000km, and the test effect of 100km after the intake filter and the engine oil are replaced is not included in statistical calculation. In the test process, the driving mileage of the vehicle at the constant speed of 60km/h, 80km/h and 100km/h and the wind speed of less than or equal to 3.3m/s is ensured to be more than 15000 km. The purpose of using SP grade low ash total synthetic engine oil is to avoid the effect of carbon dust on the particle catcher that might be produced by slightly burning the engine oil.

The test items include: (1) Engine power consumption and noise comparison when the speed of the newly built asphalt pavement road is 60km/h, 80km/h and 100km/h is basically horizontal; (2) The engine oil consumption and noise contrast when the new asphalt pavement long slope highway with the gradient of about 3 percent is fixed at the speed of 60km/h, 80km/h and 100 km/h; (3) Comparing the idle speed of the engine after the vehicle starts to run for 50 km; (4) comparing the burnt carbon regeneration conditions of the particle catcher; (5) carbon deposition in the cylinder after the test.

The test results include the following.

(1) When the speed of the newly built asphalt pavement road is fixed at 60km/h, 80km/h and 100km/h, the average value of each oil consumption of the engine is reduced by more than 5 percent (5-10 percent) when 92 alcohol-based fuel of the examples 8-18 and 21 is added, compared with the average value of each oil consumption of the engine when 92 gasoline is added in the initial stage, and the noise level of the engine is equal to or slightly lower; when the 92 alcohol-based fuel of the comparative examples 3-4, 6 and 11 is added, the average value of the oil consumption of the engine is equal to or slightly higher than that of the 92 gasoline added at the initial stage; when the 92 alcohol-based fuel of the comparative examples 4 and 7-8 is added, the average value of each oil consumption of the engine is improved by 2-3% compared with that of the initial 92 gasoline, and the noise level of the engine is obviously higher. When the 95 # alcohol-based fuel of the examples 19-20 and 22 is added, the average value of each oil consumption of the engine is lower than that of the initial 95 # gasoline, and the noise level of the engine is equal to or slightly lower; when the 95 # alcohol-based fuel of comparative examples 9-10 was added, the average value of each fuel consumption of the engine was 8-10% higher than when the 95 # gasoline was added at the initial stage, and the engine noise level was equivalent or slightly higher. Wherein the oil consumption of the alcohol-based fuel of example 8 when the high-efficiency oil jet was replaced after the first test was reduced by less than 1% compared to the oil consumption of the original oil jet, and the oil consumption of the alcohol-based fuel of comparative example 5 when the high-efficiency oil jet was replaced after the first test was reduced by about 2% compared to the oil consumption of the original oil jet.

(2) When the new asphalt pavement long-slope highway with the gradient of about 3% is subjected to constant speed of 60km/h, 80km/h and 100km/h, the average value of each oil consumption of the engine is reduced by more than 6% when 92 # alcohol-based fuel of the examples 8-18 and 21 is added, and the noise level of the engine is equivalent or slightly lower than that when 92 # gasoline is added at the initial stage; when the 92 alcohol-based fuel of the comparative examples 3-4, 6 and 11 is added, the average value of the oil consumption of the engine is equal to or slightly higher than that of the 92 gasoline added at the initial stage; when the 92 alcohol-based fuel of the comparative examples 4 and 7-8 is added, the average value of each oil consumption of the engine is improved by 1-3% compared with that of the initial 92 gasoline, and the noise level of the engine is obviously higher. When the 95 # alcohol-based fuel of the examples 19-20 and 22 is added, the average value of each oil consumption of the engine is lower than that of the initial 95 # gasoline, and the noise level of the engine is equivalent; when the 95 # alcohol-based fuel of comparative examples 9-10 was added, the average value of each fuel consumption of the engine was 10-12% higher than when the 95 # gasoline was added at the initial stage, and the engine noise level was slightly higher. Wherein the oil consumption of the alcohol-based fuel of example 8 when the high-efficiency oil jet was replaced after the first test was reduced by less than 1% compared to the oil consumption of the original oil jet, and the oil consumption of the alcohol-based fuel of comparative example 4 when the high-efficiency oil jet was replaced after the first test was reduced by about 3% compared to the oil consumption of the original oil jet.

(3) The idling speed of the engine after the vehicle starts to run for 50km is reduced by 30-50rpm when the 92 alcohol-based fuel of the examples 8-18 and 21 is added compared with the 92 gasoline at the initial stage of the test; reduced by 10-25rpm when the 92 alcohol-based fuel of comparative examples 3-4, 6, 11 was added; the addition of the 92 alcohol-based fuel of comparative examples 4, 7-8 increased 20-40rpm. The increase in the speed of the 95 alcohol-based fuel of examples 19 to 20 and 22 was 20 to 35rpm, as compared to the initial addition of 95 gasoline in the test; the addition of the 95 th alcohol-based fuel of comparative examples 9-10 increased 40-60rpm.

(4) During the alcohol-based fuel adding test, no prompt for carbon burning regeneration of the particle catcher is found; during the period of adding No. 92 and No. 95 gasoline in the initial stage, the particle catcher is found to be reminded for 4 times in the carbon burning regeneration, and the particle catcher runs until the carbon burning regeneration is finished each time, wherein the power output of an engine is seriously influenced for 1 time.

(5) After the test of adding the alcohol-based fuel is finished, the carbon deposition condition in each cylinder is checked through a spark plug hole inner peeping head, and the slight carbon deposition on the surfaces of the spark plug and the oil nozzle as well as the inner wall of the upper part of the cylinder and the top surface of the piston is basically removed.

Application example 2

The alcohol-based fuels of examples 8 and 22 were prepared 200kg each time, and the continuous addition effect of each of the alcohol-based fuels was examined under normal use conditions on 6 representative vehicles; the engine of the 6 vehicles is not burned engine oil, wherein the 1 st vehicle is a vehicle with four cylinders 1.5L of turbocharging, direct injection in the cylinders and particle catcher configured in application example 1, the 2 nd vehicle is a vehicle with four cylinders 2.0L of turbocharging, direct injection in the cylinders and particle catcher configured in the cylinders, the 3 rd vehicle is a vehicle with four cylinders 1.5L of turbocharging, direct injection in the cylinders configured in the cylinders, the 4 th vehicle is a vehicle with four cylinders 1.5L of turbocharging, multipoint electric injection in an air intake manifold configured in the cylinders 2.0L of natural air intake manifold, multipoint electric injection in the air intake manifold configured in the cylinders 5 th vehicle, the 6 th vehicle is a vehicle with four cylinders 1.6L of natural air intake manifold configured in the multipoint electric injection in the air intake manifold, all have a constant speed cruising function, and the 1,2 th and 5 th vehicles have accurate valve control technologies.

The ages of the 2 nd to 6 th vehicles before the test are 17 months, 18 months, 51 months, 22 months and 58 months respectively, the driving mileage is 42000 km, 46000 km, 98000 km, 50000 km and 144000km respectively, the engine state is good, the carbon deposition in the cylinder, the carbon deposition on the back of the air inlet manifold and the air inlet valve are checked to be very light, the effect of the oil-gas separator is normal, and 92M 15 and 95M 30 methanol gasoline is added before the test to drive 10000km respectively.

In this test, each vehicle continued to use a low ash fully synthetic engine oil of SP grade of suitable viscosity. The test is finished when the 6 vehicles all run for 26000km for 3-5 months; wherein the former 6000km is firstly driven by national standard No. 92 national six gasoline for 3000km, then by national standard No. 95 national six gasoline for 3000km, then by No. 92 alcohol-based fuel of example 8 for 10000km, and then by No. 95 alcohol-based fuel of example 22 for 10000km; the temperature is 20-35 ℃ during driving, the wind speed is less than or equal to 10m/s, but only the test effect condition is recorded when the wind speed is less than or equal to 3.3 m/s; the air quality of the driving route is high for most of time, and is good for less part of time, and severe or more haze and sand dust are not generated; the intake filter is replaced once every 5000km, the low ash total synthetic engine oil with the SP level and proper viscosity required by each vehicle is replaced once every 6000km, and the test effect of 100km after the intake filter and the engine oil are replaced is not included in statistical calculation. And the openings of the exhaust pipes behind the three-way catalysts of the vehicles are respectively connected with gas analysis equipment, and the tail gas components in a stable running state after the vehicles are started to run for 50km are sampled and detected at fixed time.

The test items include: (1) Engine power consumption and noise comparison when the speed of the newly built asphalt pavement road is 60km/h, 80km/h and 100km/h is basically horizontal; (2) The engine oil consumption and noise contrast when the new asphalt pavement long slope highway with the gradient of about 3 percent is fixed at the speed of 60km/h, 80km/h and 100 km/h; (3) Comparing the idle speed of the engine after the vehicle starts to run for 50 km; (4) Comparing the tail gas components in a stable running state after the vehicle starts running for 50 km; (5) Comparing the special carbon burning regeneration conditions when the particle catcher exists; (6) And comparing the carbon accumulation condition in the cylinder after the test with that of the previous 6000km plus the running of the national six-gasoline. In the test process, the driving mileage of each vehicle at the constant speed of 60km/h, 80km/h and 100km/h and the wind speed of less than or equal to 3.3m/s is ensured to be more than 15000 km.

The test results include the following.

(1) When the speed of the newly built asphalt pavement road is 60km/h, 80km/h and 100km/h, the average value of each oil consumption of the engine is reduced by more than 5% when the 92 # alcohol-based fuel of the embodiment 8 is added, and the noise level of the engine is equal to or slightly lower than that when the 92 # gasoline is added in the initial stage; when the 95 # alcohol-based fuel of example 22 was added, the average fuel consumption of the engine was improved by less than 4% over the initial 95 # gasoline addition, and the engine noise level was comparable or slightly lower.

(2) When the new asphalt pavement long-slope highway with the gradient of about 3% is subjected to constant speed of 60km/h, 80km/h and 100km/h, the average value of each oil consumption of the engine is reduced by more than 5% when the 92 alcohol-based fuel of the embodiment 8 is added, compared with the initial 92 gasoline, and the noise level of the engine is equal to or slightly lower; when the 95 # alcohol-based fuel of example 22 was added, the average fuel consumption of the engine was increased by 5% or less over the initial 95 # gasoline addition, and the engine noise level was comparable.

(3) The idle speed of the engine after 50km of running of the vehicle was reduced by 25 to 40rpm when the 92 # alcohol-based fuel of example 8 was added and increased by 20 to 45rpm when the 95 # alcohol-based fuel of example 22 was added, as compared with the cases when the 92 # and 95 # gasoline were added at the initial stage of the test.

(4) The exhaust gas components in the steady running state after 50km of running of each vehicle was started, and compared with the case of adding 92 and 95 gasoline in the initial stage of the test, the NOx and CO contents were reduced by 70% or more, CH and CH when the 92 alcohol-based fuel of example 8 was added and the 95 alcohol-based fuel of example 22 was added ₄ The content is reduced by more than 20 percent.

(5) During the test of the alcohol-based fuel for the 1 st and the 2 nd vehicles, no prompt of carbon burning regeneration of the particle catcher is found; during the initial addition of No. 92 and No. 95 gasoline, the particle catcher is found to be prompted 5 times in the carbon burning regeneration, and the particle catcher runs to the end of the carbon burning regeneration each time, wherein the power output of the engine is seriously affected 2 times.

(6) After the test is finished, the spark plug in each cylinder, the surface of the oil nozzle, the inner wall of the upper part of the cylinder and the carbon deposit on the top surface of the piston are inspected by a spark plug hole inner probe, the 1 st vehicle is found to be completely removed, the 2 nd to 6 th vehicles are obviously reduced compared with the vehicle before the alcohol-based fuel is changed, and the carbon deposit in each cylinder is basically removed.

The national standard No. 92 or No. 95 national hexagasoline is filled in a normal filling station with good credit at a test site, and the measurement is acknowledged to be accurate and the quality is best.

Claims

1. The modified alcohol-based composite environment-friendly fuel comprises, by weight, 10-40% of methanol, 5-10% of palm oil, 0.1-0.5% of an atomized combustion control agent, 0.02-0.1% of a metal corrosion inhibitor, 0.02-0.2% of a rubber expansion inhibitor and the balance solvent oil; the sulfur content of the solvent oil is less than or equal to 10mg/kg, and is No. 1-4 solvent oil; the control agent for atomized combustion comprises polymethylphenyl ethanol ((CH) ₃ ) _X -C ₆ H _6-X-1 )-CH ₂ -CH ₂ -OH, polymethylphenyl ethyl ether ((CH) ₃ ) _X -C ₆ H _6-X-1 )-O-CH ₂ -CH ₃ The weight ratio of the poly (methyl phenyl ethyl alcohol) to the poly (methyl phenyl ethyl ether) is 50-75:5-15, the total content of the poly (methyl phenyl ethyl alcohol) and the poly (methyl phenyl ethyl ether) is more than or equal to 60wt%, wherein X=2 or 3; when x=2, the polymethylphenyl group is an o-dimethylphenyl or m-dimethylphenyl group, and when the polymethylphenyl group is an o-dimethylphenyl group, the-CH ₂ -CH ₂ -OH or-O-CH ₂ -CH ₃ The linkage position to the benzene ring is 4-position, and when the polymethylphenyl group is m-dimethylphenyl, the-CH ₂ -CH ₂ -OH or-O-CH ₂ -CH ₃ The connection position with the benzene ring is 5; the polymethylphenyl group is 1,2, 3-trimethylphenyl group, or 1,2, 4-trimethylphenyl group when x=3, the-CH ₂ -CH ₂ -OH or-O-CH ₂ -CH ₃ The connection positions of the benzene ring and the benzene ring are all 5 positions;

the preparation method of the polymethylphenyl ethanol and polymethylphenyl ethyl ether in the atomized combustion control agent comprises the following steps: mixing one or more of o-xylene, m-xylene, mesitylene and mesitylene or aromatic hydrocarbon oil containing more than 80wt% of the poly-methyl benzene with ethylene oxide according to a required proportion, adding a powdery Pt/HZSM-5 molecular sieve catalyst, reacting at a temperature of 30-40 ℃ under a liquid phase condition for 8-20h under stirring, separating the Pt/HZSM-5 molecular sieve catalyst after the reaction until the ethylene oxide is completely converted, and obtaining a reaction generating solution containing poly-methyl phenyl ethanol, poly-methyl phenyl ether and the rest poly-methyl benzene or the aromatic hydrocarbon oil rest material in a weight ratio of 50-75:5-15; the dosage of the Pt/HZSM-5 molecular sieve catalyst in the reaction is 3-10wt% of the total dosage of the polymethylbenzene and the ethylene oxide liquid; the Pt content of the Pt/HZSM-5 molecular sieve catalyst is 0.05-0.1wt%, and the catalyst is loaded into a pore canal in a crystal grain of the HZSM-5 molecular sieve by a cation exchange method, and is obtained by reducing and drying hydrazine hydrate; the HZSM-5 molecular sieve has a silicon-aluminum ratio of 60-120, is a crystal rather than a microcrystalline aggregate, has a relative crystallinity higher than 95%, has a grain number of 0.8-5 μm in an overall dimension of more than 95% and less than 1% of the total grain number, and has two main pore sizes of 0.53×0.56nm and 0.51×0.55nm respectively;

in the preparation process of the polymethylphenyl ethanol and the polymethylphenyl diethyl ether, the feeding ratio of the polymethylbenzene or the polymethylbenzene contained in the aromatic hydrocarbon oil to the mass of the ethylene oxide is 100:50-75.

2. The modified alcohol-based composite environment-friendly fuel as claimed in claim 1, wherein the weight ratio of the polymethylphenyl ethanol to the polymethylphenyl ethyl ether in the atomized combustion control agent is 58-63:8.

3. The modified alcohol-based composite environment-friendly fuel as claimed in claim 1, wherein the weight content ratio of the methanol to the atomized combustion control agent is 100:1.0-2.0.

4. The modified alcohol-based composite environment-friendly fuel according to claim 1, wherein the solvent oil is a mixture of one or two of solvent oil No. 1 and No. 2 and one or two of solvent oil No. 3 and No. 4.

5. The modified alcohol-based composite environment-friendly fuel according to claim 1, wherein the metal corrosion inhibitor is a mixture of benzotriazole and pyridone in a weight ratio of 3-6:1; the rubber expansion inhibitor is JH4012 of the Western An Jiahong technology Co.

6. The modified alcohol-based composite environmental-friendly fuel according to claim 1, wherein the methanol comprises vehicle fuel methanol conforming to GB/T23510-2009, and qualified, first-grade or superior products of GB/T338-2011 industrial methanol.