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A urea product used for vehicles and freeze-proofing at -25 DEG C and a preparation method thereof

A technology of urea and urea for vehicles, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. It can solve the problems of inconvenient storage, carrying and filling, inapplicability to northern vehicles, and increased vehicle costs, so as to save evaporation. and granulation process, broaden the scope of use, simple composition effect

Inactive Publication Date: 2019-11-01
山西思淼环保技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems existing in the prior art, the present invention discloses a -25°C antifreeze vehicle urea and its preparation method, which solves the problem that the conventional vehicle urea has a high freezing point temperature and cannot be applied to northern vehicles or used in For vehicles in the north, additional parts such as heating pipe circuits, temperature sensors, and insulation layers need to be added to the vehicle, resulting in an increase in vehicle cost and a higher failure rate. and raising issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of urea for antifreezing vehicles at -25°C is made of the following raw materials in parts by weight: 22 parts of urea, 25 parts of ammonium formate, 10 parts of methanol, and 47 parts of deionized water; wherein, ammonium formate is introduced into formic acid Ammonia, the ammonium formate that obtains nitrogen content is 20% (mass fraction); Urea is the high-purity urea that mass fraction is 70%, is the urine after flashing; Formic acid and methyl alcohol are analytically pure; Above-25 ℃ The preparation method of the urea for antifreezing vehicles is as follows: add ammonium formate, urea and methanol to deionized water, mix well, and then filter the finished product through a filter membrane of 0.3-0.7 μm.

[0019] It has been determined that the freezing point of the low-temperature vehicle urea solution is -25°C, it is odorless, the appearance is clear and transparent, and the density is 1.09g / cm 3 , the content of biuret is 0.02%, the content of impurity e...

Embodiment 2

[0022] A kind of urea for antifreezing vehicles at -25°C is made from the following raw materials in parts by weight: 26 parts of urea, 15 parts of ammonium formate, 20 parts of methanol, and 38 parts of deionized water; wherein, ammonium formate is introduced into formic acid Ammonia, the ammonium formate that obtains nitrogen content is 20% (mass fraction); Urea is the high-purity urea that mass fraction is 60%, is the urine after flashing; Formic acid and methyl alcohol are analytically pure; Above-25 ℃ The preparation method of the urea for antifreezing vehicles is as follows: add ammonium formate, urea and methanol to deionized water, mix well, and then filter the finished product through a filter membrane of 0.3-0.7 μm.

[0023] It has been determined that the freezing point of the low-temperature vehicle urea solution is -26°C, it is odorless, the appearance is clear and transparent, and the density is 1.10g / cm 3 , the content of biuret is 0.02%, the content of impurity...

Embodiment 3

[0026] A kind of urea for antifreezing vehicles at -25°C is made of the following raw materials in parts by weight: 23 parts of urea, 22 parts of ammonium formate, 13 parts of methanol, and 45 parts of deionized water; wherein, ammonium formate is introduced into formic acid Ammonia, the ammonium formate that obtains nitrogen content is 20% (mass fraction); Urea is the high-purity urea that mass fraction is 62%, is the urine after flash evaporation; Both formic acid and methyl alcohol are analytically pure; Above-25 ℃ The preparation method of the urea for antifreezing vehicles is as follows: add ammonium formate, urea and methanol to deionized water, mix well, and then filter the finished product through a filter membrane of 0.3-0.7 μm.

[0027] It has been determined that the freezing point of the urea solution for low-temperature vehicles is -25.8°C, it is odorless, the appearance is clear and transparent, and the density is 1.09g / cm 3 , the content of biuret is 0.02%, the ...

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Abstract

A urea product used for vehicles and freeze-proofing at -25 DEG C and a preparation method thereof are disclosed. The urea product is prepared from urea, ammonium formate, methanol and deionized waterby steps of adding the ammonium formate, the urea and the methanol into the deionized water, fully mixing the mixture and filtering the mixture with a filter membrane having a pore size of 0.3-0.7 [mu]m. A problem that conventional urea products for vehicle use have high condensation points and cannot be used for vehicles in the northern region, or a problem that vehicle costs and fault rates areincreased due to additionally arrangement of heating pipe loops, temperature sensors, heat insulation layers, and other auxiliary components on vehicles when the conventional urea products are used for vehicles in the northern region, and a problem that conventional urea products for vehicle use are inconvenient to store, carry, inject or the like in the northern cold region as the conventional urea products coagulate into solid or solid-liquid mixtures, are solved by the disclosed urea product.

Description

technical field [0001] The invention belongs to the technical field of organic chemistry and relates to urea for vehicles, in particular to urea for antifreezing vehicles at -25°C and a preparation method thereof. Background technique [0002] Studies have shown that vehicle exhaust emissions account for about 30% of the total PM2.5 pollutants in the country, and vehicle exhaust emissions are one of the main culprits causing smog in my country. Among the pollutants emitted by automobile exhaust, the exhaust pollution from heavy-duty diesel vehicles is as high as more than 2 / 3. The data shows that the number of diesel vehicles in my country currently only accounts for 17% of the total number of vehicles, but the nitrogen oxides (NOx) emitted by diesel vehicles X ) and fine particulate (PM) pollutants account for more than 60% and 90% of total motor vehicle emissions. Diesel vehicle pollution control is the focus of motor vehicle emission control. [0003] At present, most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/94B01D53/56
CPCB01D53/9418B01D2251/2067
Inventor 薛国军
Owner 山西思淼环保技术开发有限公司