CN101067094B - Preparation method of microemulsion diesel oil - Google Patents

Abstract

The invention relates to a preparation method of micro-emulsified diesel oil. The preparation method is to mix No. 0 diesel oil and oleic acid, stir in a water bath at a medium speed for a period of time, and after fully dissolving, add water dropwise at an even speed, and then slowly add in drops after stirring for a period of time Ethanolamine and continue stirring to fully emulsify the mixed solution. After the emulsion becomes clear, add No. 200 solvent oil and stir for a period of time to obtain micro-emulsion diesel oil. The preparation method is simple, and the prepared micro-emulsion diesel oil is uniform in appearance, bright and transparent, High stability, low cost and other advantages.

Description

Preparation method of microemulsion diesel oil

technical field

The invention relates to a preparation method of microemulsion diesel oil.

Background technique

Since the beginning of the new century, many countries in the world have been affected by globalization and have entered a new period of rapid growth. Under such circumstances, the world's demand for energy is increasing day by day, and the sustainability of energy supply and environmental issues have become the most concerned issues in the world today.

Therefore, to solve the problem of energy shortage at this stage, "open source" and "energy saving" must be developed simultaneously. Although all countries in the world have made great efforts in "open source" at present, they are quite different from the grand scene of oil exploitation in the last century. Therefore, in recent years, they have focused on the work of "energy saving": one is to improve the internal combustion engine technically. Efficiency: The second is to improve fuel quality and combustion efficiency. It is a simple and effective energy-saving measure to add additives matching its composition to diesel to improve its combustion conditions. As an alternative fuel technology, emulsified diesel oil can reduce fuel consumption and control emissions. It has shown its superiority in saving fuel and improving environmental pollution. It has been widely valued and explored, and has achieved great development. Although many scientific research departments and scientific and technological workers have made remarkable achievements in the field of diesel oil mixed with water, and the technology of diesel oil mixed with water has also developed to a considerable level, however, emulsified diesel oil has not been widely promoted and applied so far. The main reasons are have:

1. The research on emulsified diesel has not been fully in-depth, the formation mechanism has not been fully understood, and a complete and clear set of theories and standards to evaluate the quality of emulsified diesel has not yet been found.

2. The emulsified diesel has stability problems. The dispersion of the dispersed phase of the emulsified diesel is uneven, and long-term storage will cause turbidity, water separation, and stratification, which will affect the promotion of large areas.

3. In the previous diesel emulsification process, in order to achieve the long-term stability of the emulsified diesel oil without delamination of oil and water, it is necessary to add a large amount of emulsifier. Since the price of emulsifier is still high today, a large amount of use will inevitably make diesel oil The cost increases, so reducing the use of high-cost additives remains an important concern.

4. It is more and more important to add other additives to increase the combustion value of emulsified diesel oil and further reduce the environmental pollution caused by the use of diesel oil.

5. The combustion method of emulsified diesel oil mixed with water has its own weaknesses. It cannot solve the contradiction between stable operation at low load and low emission at high load.

Contents of the invention

The purpose of the present invention: aiming at the problems existing in the current emulsified diesel oil, through the research on its preparation method, the emulsification effect of the emulsified diesel oil in the preparation process is improved, the particle size of the emulsified diesel oil tends to be uniform, thereby preparing a product with high stability, It is a practical micro-emulsion diesel oil with good combustion effect, long-lasting bright and clear appearance, and the same appearance as ordinary diesel oil.

The present invention is achieved through the following technical solutions:

A preparation method of micro-emulsified diesel oil is to mix 0# diesel oil with oleic acid, stir in a water bath at 25-45°C at a speed of 800-1200 rpm for 10-30 minutes, and drop it into water at an even speed after fully dissolving , the speed is controlled at 1-3 drops per second. After the dropwise addition, keep the speed of 800-1400 rpm and continue stirring for 10-20 minutes, then slowly add ethanolamine dropwise at a rate of 1-3 drops per second, and reduce the stirring speed to 300-800 rev/min, stirring for a long period of time to fully emulsify the mixed solution, add 200# solvent oil after the emulsion becomes clear and stir for a period of time to obtain micro-emulsion diesel oil.

The beneficial effects of the present invention are:

The emulsified diesel oil prepared by this preparation process has a good degree of dispersion, and the particle radius of the dispersed phase is uniform, which is conducive to improving the "micro-explosion" effect and "secondary atomization" effect of the emulsified diesel oil in the combustion process, so that the emulsified diesel oil burns More complete, to achieve the purpose of improving the combustion effect.

The preparation method is simple and suitable for large-scale production applications. The practical micro-emulsion diesel oil prepared by the preparation process has the characteristics of no stratification itself, high stability, long-lasting brightness, clarity and no stratification, and the same appearance as ordinary diesel oil. Moreover, the prepared emulsified diesel oil has good combustion performance and has the effect of saving energy and reducing pollution.

Detailed ways

The following examples further prove the present invention, and the present invention is not limited thereto.

Embodiment one:

Mix 0# diesel oil with oleic acid, stir in a water bath at about 30°C at a speed of 900 rpm for 30 minutes, and drop it into water at an even speed after fully dissolving, with the speed controlled at 1-2 drops per second. Keep stirring at a speed of 900 rpm and continue stirring for 20 minutes, then slowly add ethanolamine dropwise at a rate of 1 to 2 drops per second, reduce the stirring speed to 600 rpm, and stir for a long period of time to fully emulsify the mixture. After becoming clear, add 200# solvent naphtha and stir for a period of time to obtain micro-emulsified diesel oil.

Embodiment two:

Mix 0# diesel oil with oleic acid, stir in a water bath at about 35°C at a speed of 1200 rpm for 20 minutes, and drop it into water at an even speed after fully dissolving. Keep stirring at a speed of 1200 rpm and continue stirring for 15 minutes, then slowly add ethanolamine dropwise at a rate of 1-2 drops per second, reduce the stirring speed to 600 rpm, and stir for a long period of time to fully emulsify the mixture. After becoming clear, add 200# solvent naphtha and stir for a period of time to obtain micro-emulsified diesel oil.

Embodiment three:

Mix 0# diesel oil with oleic acid, stir in a water bath at about 40°C at a speed of 1400 rpm for 10 minutes. Keep stirring at a speed of 1400 rpm and continue stirring for 10 minutes, then slowly add ethanolamine dropwise at a rate of 2 to 3 drops per second, reduce the stirring speed to 500 rpm, and stir for a long period of time to fully emulsify the mixture. After becoming clear, add 200# solvent naphtha and stir for a period of time to obtain micro-emulsified diesel oil.

Claims (4)

1. A preparation method of micro-emulsified diesel oil, characterized in that: 0# diesel oil is mixed with oleic acid, stirred at a speed of 800-1200 rpm in a water bath at 25-45°C for 10-30 minutes, and fully dissolved Drop into water at an even speed, and the speed is controlled at 1-3 drops per second. After the dropping is completed, keep the speed of 800-1400 rpm and continue stirring for 10-20 minutes, and then slowly add ethanolamine at a rate of 1-3 drops per second. Reduce the stirring speed to 300-800 rpm, and stir for a long period of time to fully emulsify the mixed solution. After the emulsion becomes clear, add 200# solvent oil and stir for a period of time to obtain micro-emulsified diesel oil. 2. The preparation method of micro-emulsified diesel oil according to claim 1, characterized in that: 0# diesel oil is mixed with oleic acid, stirred at a speed of 900 rpm in a water bath at 30°C for 30 minutes, and homogeneous after fully dissolving Slowly add water, the speed is controlled at 1-2 drops per second, and after the addition is completed, keep stirring at a speed of 900 rpm for 20 minutes, then slowly add ethanolamine at a speed of 1-2 drops per second, and reduce the stirring speed to 600 rev/min, stir for a long period of time to fully emulsify the mixed solution, add 200# solvent oil after the emulsion becomes clear and stir for a period of time to obtain micro-emulsified diesel oil. 3. The preparation method of micro-emulsified diesel oil according to claim 1, characterized in that: 0# diesel oil is mixed with oleic acid, stirred at a speed of 1200 rpm in a water bath at 35°C for 20 minutes, and homogeneous after fully dissolving Slowly add water, the speed is controlled at 1-2 drops per second, keep stirring at 1200 rpm for 15 minutes after the addition is completed, then slowly add ethanolamine at a rate of 1-2 drops per second, reduce the stirring speed to 600 rev/min, stir for a long period of time to fully emulsify the mixed solution, add 200# solvent oil after the emulsion becomes clear and stir for a period of time to obtain micro-emulsified diesel oil. 4. The preparation method of micro-emulsified diesel oil according to claim 1, characterized in that: 0# diesel oil is mixed with oleic acid, stirred at a speed of 1400 rpm in a water bath at 40°C for 10 minutes, and homogeneous after fully dissolving Slowly add water, the speed is controlled at 2 to 3 drops per second, after the drop is completed, keep stirring at a speed of 1400 rpm for 10 minutes, then slowly add ethanolamine at a rate of 2 to 3 drops per second, and reduce the stirring speed to Stir at 500 rpm for a long period of time to fully emulsify the mixed solution. After the emulsion becomes clear, add 200# solvent oil and stir for a period of time to obtain micro-emulsified diesel oil.