Diesel vehicle urea solution with low-temperature properties and preparation method thereof
A low-temperature performance, diesel vehicle technology, applied in the field of urea solution for diesel vehicles and its preparation, can solve the problems of increased process difficulty, complex components, poor stability, etc., to improve NOx reduction efficiency, simple composition and preparation method, surface tension small effect
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Embodiment 1
[0046] (1) Add 4.9376g of high-purity urea into a round-bottomed flask to which 10.2411g of high-purity water has been added, seal it with a ground plug, heat in a water bath to 40°C, and stir magnetically until the urea is completely dissolved and the solution is transparent;
[0047] (2) Cool the solution obtained in step (1) to room temperature, add 2.5629 g of ethanolamine, seal it with a ground plug, and stir magnetically until the solution is completely mixed and uniform.
[0048] (3) Add 1.1335 g of methanol to the solution obtained in step (2), seal it with a ground plug, and stir magnetically until the solution is completely mixed and uniform.
[0049] (4) The solution obtained in step (3) is pressure-filtered with a filter element with a filtration accuracy of 0.8pm and 0.6MPa to obtain the urea solution for diesel vehicles with low temperature performance of the present invention.
[0050] It has been determined that the freezing point of the mixture solution is -18...
Embodiment 2
[0053] (1) Add 5.0335g of high-purity urea into a round-bottomed flask to which 10.4505g of high-purity water has been added, seal it with a ground plug, heat in a water bath to 40°C, and stir magnetically until the urea is completely dissolved and the solution is transparent;
[0054] (2) Cool the solution obtained in step (1) to room temperature, add 2.626 g of ethanolamine, seal it with a ground plug, and stir magnetically until the solution is completely mixed and uniform.
[0055] (3) Add 2.6200 g of methanol to the solution obtained in step (2), seal it with a ground plug, and stir magnetically until the solution is completely mixed and uniform.
[0056] (4) The solution obtained in step (3) is pressure-filtered with a filter element with a filtration accuracy of 0.8pm to obtain the urea solution for diesel vehicles with low-temperature performance of the present invention.
[0057] It has been determined that the freezing point of the mixture solution is -24°C, the surf...
Embodiment 3
[0060] (1) Add 5.0342g of high-purity urea into a round-bottomed flask to which 10.4476g of high-purity water has been added, seal it with a ground plug, heat in a water bath to 40°C, and stir magnetically until the urea is completely dissolved and the solution is transparent;
[0061] (2) Cool the solution obtained in step (1) to room temperature, add 2.6135 g of ethanolamine, seal it with a ground plug, and stir magnetically until the solution is completely mixed and uniform.
[0062] (3) Add 4.4703 g of methanol to the solution obtained in step (2), seal it with a ground plug, and stir magnetically until the solution is completely mixed and uniform.
[0063] (4) The solution obtained in step (3) is pressure-filtered with a filter element with a filtration accuracy of 0.8pm and 0.6MPa to obtain the urea solution for diesel vehicles with low temperature performance of the present invention.
[0064] It has been determined that the freezing point of the mixture solution is -28...
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