A microemulsified diesel fuel and its preparation method

Abstract

This invention discloses a microemulsified diesel fuel and its preparation method. The method involves uniformly mixing sodium dodecylbenzenesulfonate, oleic acid, and industrial ammonia, then adding diesel fuel and stirring. Next, n-octanol and ethyl acetate are slowly added and stirred at high speed until a clear, transparent microemulsion is obtained. Compared with existing technologies, the microemulsified diesel fuel prepared by this invention has lower viscosity, is easier to combust, is less expensive, and has better stability. Furthermore, all raw materials in the formulation are biodegradable, resulting in less environmental impact.

Description

Technical Field

[0001] This invention relates to the field of clean energy technology, specifically to a microemulsified diesel fuel and its preparation method. Background Technology

[0002] Biodiesel is an ester compound produced from oils derived from oil crops, wild oil plants, and engineered microalgae, as well as animal fats and waste cooking oils, through processes such as transesterification. Biodiesel (fatty acid methyl esters) is a type of biomass energy, a renewable energy source that can replace petrochemical diesel, and a typical "green energy" fuel. It is an oxygen-containing, virtually sulfur-free, and aromatic hydrocarbon-free green renewable fuel. It is a modified fuel oil, primarily composed of hydrocarbons, and produces very few harmful gases after combustion, making it a clean biofuel that can replace petrochemical diesel. However, biodiesel also has its drawbacks: it has high viscosity, poor volatility, low combustion efficiency, and a relatively low calorific value. Summary of the Invention

[0003] In view of the problems existing in the prior art, the present invention discloses a microemulsified diesel fuel, comprising the following percentage raw materials: 60-80% diesel fuel, 15-20% water, 1-2% sodium dodecylbenzenesulfonate, 2-3% oleic acid, 0.5-1% industrial ammonia, 5-10% n-octanol, and 1-3% ethyl acetate.

[0004] As a preferred technical solution of the present invention, it specifically includes 70% diesel oil, 15% water, 1% sodium dodecylbenzenesulfonate, 2% oleic acid, 1% industrial ammonia, 10% n-octanol, and 1% ethyl acetate.

[0005] As a preferred embodiment of the present invention, the mixture comprises 69.5% diesel oil, 20% water, 2% sodium dodecylbenzenesulfonate, 2% oleic acid, 0.5% industrial ammonia, 5% n-octanol, and 1% ethyl acetate.

[0006] As a preferred embodiment of the present invention, the mixture comprises 61% diesel oil, 20% water, 2% sodium dodecylbenzenesulfonate, 3% oleic acid, 1% industrial ammonia, 10% n-octanol, and 3% ethyl acetate.

[0007] This invention designs a diesel microemulsion system based on oleic acid and ammonia as the main surfactants. During combustion, the water in the industrial ammonia solution added internally boils and liquefies before the diesel, decomposing the surrounding oil droplets into smaller oil mists, increasing the contact area between the diesel and air, making combustion faster and more complete, while reducing the formation of harmful substances such as carbon oxides. This invention uses oleic acid as the main emulsifier and industrial ammonia as a neutralizing agent, reacting with oleic acid to form ammonium oleate soap, which acts as a better surfactant. The addition of sodium dodecylbenzenesulfonate forms a complex system with the ammonium oleate soap, and n-octanol further reduces interfacial tension, forming a more stable microemulsion. This results in a less prone to separation of the oil and a longer shelf life.

[0008] A method for preparing microemulsified diesel fuel, characterized by comprising the following steps: Step 1: After thoroughly mixing and stirring 1-2% sodium dodecylbenzenesulfonate, 2-3% oleic acid, 0.5-1% industrial ammonia, and 15-20% water, slowly add 60-80% diesel fuel. Step 2: Add 1-3% ethyl acetate and 5-30% n-octanol to the mixture from Step 1, and continue stirring rapidly until a clear and transparent microemulsion is formed.

[0009] In a preferred embodiment of the present invention, in step one, sodium dodecylbenzenesulfonate, oleic acid, and industrial ammonia are mixed using a low-speed magnetic stirrer, with a stirring speed not exceeding 60 r / min. Low-speed stirring allows the liquid surface to flow smoothly, preventing the formation of vortices that could lead to air entrainment and foaming. Simultaneously, low-speed rotation ensures uniform contact between the ammonia and oleic acid, forming a stable ammonium oleate soap and preventing excessively rapid localized reactions.

[0010] In a preferred embodiment of the present invention, the stirring speed in step two is 240-480 r / min, and the stirring time is not less than 80 min. This speed can prevent the formation of unstable porridge-like substances, while allowing the components to mix quickly and evenly, and ensuring sufficient reaction time to ensure that all materials inside are processed uniformly.

[0011] In a preferred embodiment of the present invention, ethyl acetate is added in equal amounts multiple times in step two, with no fewer than three additions. Multiple additions effectively disperse viscous resistance, ensuring uniform dispersion of ethyl acetate and sufficient contact between it and the components within the reaction vessel. Furthermore, multiple additions result in a more stable final mixed film structure encapsulating oil droplets.

[0012] The beneficial effects of this invention are: the microemulsified diesel prepared by this invention has lower viscosity, is easier to burn, reduces the generation of harmful substances such as carbon oxides, is more cost-effective and has better stability, and all raw materials in the formula are biodegradable, resulting in less environmental impact. Detailed Implementation

[0013] Example 1

[0014] This invention discloses a method for preparing microemulsified diesel fuel, comprising the following steps: Step 1: After thoroughly mixing and stirring 2% sodium dodecylbenzenesulfonate, 3% oleic acid, 1% industrial ammonia, and 15% water, slowly add 61% diesel fuel. Step 2: Add 3% ethyl acetate and 10% n-octanol sequentially to the mixture from Step 1, and stir rapidly until a clear, transparent microemulsion is formed. Step 5: After high-pressure homogenization, sterilize at 200 MPa for 15 minutes to obtain the finished fermented soy milk.

[0015] Example 2

[0016] This invention discloses a microemulsified diesel fuel and its preparation method, comprising the following steps: Step 1: After thoroughly mixing and stirring 1% sodium dodecylbenzenesulfonate, 2% oleic acid, 1% industrial ammonia, and 15% water, slowly add 70% diesel fuel. Step 2: Add 1% ethyl acetate and 10% n-octanol to the mixture from Step 1 in sequence, and continue to stir rapidly until a clear and transparent microemulsion is formed.

[0017] Example 3

[0018] This invention discloses a microemulsified diesel fuel and its preparation method, comprising the following steps: Step 1: After thoroughly mixing and stirring 2% sodium dodecylbenzenesulfonate, 2% oleic acid, 0.5% industrial ammonia, and 20% water, slowly add 69.5% diesel fuel. Step 2: Add 1% ethyl acetate and 5% n-octanol to the mixture from Step 1 in sequence, and continue to stir rapidly until a clear and transparent microemulsion is formed.

[0019] Components not described in detail in this article are existing technologies.

[0020] While the specific embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and modifications or variations without creative effort are still within the protection scope of the present invention.

Claims

1. A microemulsified diesel fuel, characterized in that: The raw materials include the following percentages: 60-80% diesel oil, 15-20% water, 1-2% sodium dodecylbenzenesulfonate, 2-3% oleic acid, 0.5-1% industrial ammonia, 5-10% n-octanol, and 1-3% ethyl acetate.

2. The microemulsified diesel fuel according to claim 1, characterized in that: It includes 70% diesel oil, 15% water, 1% sodium dodecylbenzenesulfonate, 2% oleic acid, 1% industrial ammonia, 10% n-octanol, and 1% ethyl acetate.

3. The microemulsified diesel fuel according to claim 1, characterized in that: It includes 69.5% diesel oil, 20% water, 2% sodium dodecylbenzenesulfonate, 2% oleic acid, 0.5% industrial ammonia, 5% n-octanol, and 1% ethyl acetate.

4. The microemulsified diesel fuel according to claim 1, characterized in that: It includes 61% diesel oil, 20% water, 2% sodium dodecylbenzenesulfonate, 3% oleic acid, 1% industrial ammonia, 10% n-octanol, and 3% ethyl acetate.

5. The method for preparing microemulsified diesel oil according to claim 1, characterized in that, Includes the following steps: Step 1: After thoroughly mixing and stirring 1-2% sodium dodecylbenzenesulfonate, 2-3% oleic acid, 0.5-1% industrial ammonia, and 15-20% water, slowly add 60-80% diesel fuel. Step 2: Add 1-3% ethyl acetate and 5-30% n-octanol to the mixture from Step 1, and continue stirring rapidly until a clear and transparent microemulsion is formed.

6. The method for preparing microemulsified diesel oil according to claim 5, characterized in that: In step one, sodium dodecylbenzenesulfonate, oleic acid, and industrial ammonia are mixed using low-speed magnetic stirring, with a stirring speed not exceeding 60 r / min.

7. The method for preparing microemulsified diesel oil according to claim 5, characterized in that: In step two, the stirring speed is 240-480 r / min, and the stirring time is not less than 80 min.

8. The method for preparing microemulsified diesel oil according to claim 5, characterized in that: When adding ethyl acetate in step two, add it in equal amounts multiple times, with no fewer than three additions.