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Urea solution for vehicle and preparation method thereof

A technology of urea and solution for vehicles, which is applied in the field of urea solution for vehicles and its preparation, can solve the problems of low freezing point of urea solution for vehicles, incomplete decomposition of urea, good dispersibility, etc., and achieve surface activity enhancement, condensation reaction inhibition, The effect of reducing surface tension

Inactive Publication Date: 2018-12-14
罗永平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The invention provides a urea solution for vehicles and a preparation method thereof. The urea solution for vehicles prepared by the invention has a low freezing point and good dispersibility, can solve the problems of incomplete urea decomposition, poor dispersibility, and easy crystallization, and effectively reduce biuret , cyanuric acid and other by-products, effectively improving the conversion rate of NOx at low exhaust temperature, and not easy to deactivate the SCR catalyst

Method used

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  • Urea solution for vehicle and preparation method thereof

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Effect test

Embodiment 1

[0025] The preparation of amido carboxylate type gemini surfactant: get N,N-dimethylpropylenediamine, ethylenediaminetetraacetic dianhydride, triethylamine according to the molar mass ratio of 1.0:2.5:0.2, and N , N-dimethylpropylenediamine and triethylamine were dissolved in tetrahydrofuran and placed in a three-necked flask, and ethylenediaminetetraacetic dianhydride was divided into three parts on average, and then added to the three-necked flask in batches. React for 18.5 hours. After the reaction, place the reaction solution in a rotary evaporator to evaporate tetrahydrofuran, then wash it with water 4 times to remove unreacted ethylenediaminetetraacetic acid dianhydride, cool and filter under reduced pressure to separate the crude product, and then use ethanol, methanol The mixed solvent is recrystallized to obtain the amido carboxylate type gemini surfactant.

[0026] Preparation of urea solution: Mix 38 parts of urea with 70 parts of high-purity water with a resistivit...

Embodiment 2

[0029] The preparation of amido carboxylate type gemini surfactant: take N,N-dimethylpropylenediamine, ethylenediaminetetraacetic dianhydride, triethylamine according to the molar mass ratio of 1.0:2.6:0.2, and N , N-dimethylpropanediamine and triethylamine were dissolved in tetrahydrofuran and placed in a three-necked bottle, and ethylenediaminetetraacetic dianhydride was divided into three parts on average, and then added to the three-necked bottle in batches. React for 19 hours. After the reaction, place the reaction solution in a rotary evaporator to evaporate THF to remove THF, then wash with water 3.5 times to remove unreacted ethylenediaminetetraacetic dianhydride, cool and filter under reduced pressure to separate the crude product, and then mix it with ethanol and methanol Solvent recrystallization promptly obtains amido carboxylate type gemini surfactant.

[0030] Preparation of urea solution: Mix 32 parts of urea with 80 parts of high-purity water with a resistivity...

Embodiment 3

[0033] The preparation of amido carboxylate type gemini surfactant: get N,N-dimethylpropylenediamine, ethylenediaminetetraacetic dianhydride, triethylamine according to the molar mass ratio of 1.0:2.8:0.2, and N , N-dimethylpropanediamine and triethylamine were dissolved in tetrahydrofuran and placed in a three-necked bottle, and ethylenediaminetetraacetic dianhydride was divided into three parts on average, and then added to the three-necked bottle in batches. React for 18 hours. After the reaction, place the reaction solution in a rotary evaporator to evaporate THF to remove THF, then wash with water 4.5 times to remove unreacted EDTA, cool and filter under reduced pressure to separate the crude product, then mix with ethanol and methanol Solvent recrystallization promptly obtains amido carboxylate type gemini surfactant.

[0034] Preparation of urea solution: Mix 30 parts of urea with 75 parts of high-purity water with a resistivity of 18.5MΩ·cm evenly, stir and mix for 9 m...

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Abstract

The invention relates to a urea solution for a vehicle and a preparation method thereof, belonging to the technical field of treatment of automobile exhaust. The urea solution for the vehicle comprises, by weight, 30-40 parts of urea, 60-80 parts of high-purity water, 12-18 parts of cocamidopropyl betaine, 15-20 parts of an amido carboxylate type gemini surfactant, 3-4 parts of polyvinylpyrrolidone, 1-3 parts of an alcohol derivative of phenols and 5-8 parts of polyepoxysuccinic acid. The preparation method comprises the following steps: (1) mixing urea with high-purity water under stirring soas to obtain a mixed solution, allowing the mixed solution to pass through a filter so as to remove impurities, and then removing metal ions in the mixed solution through an ion exchange resin columnso as to obtain a urea solution; and (2) mixing the urea solution prepared in the step (1), cocamidopropyl betaine, the amido carboxylate type gemini surfactant, polyvinylpyrrolidone, the alcohol derivative of phenols and polyepoxysuccinic acid under stirring and then carrying out filtering so as to obtain the urea solution for the vehicle.

Description

technical field [0001] The invention belongs to the technical field of automobile tail gas treatment, in particular to a urea solution for automobiles and a preparation method thereof. Background technique [0002] With the frequent occurrence of smog, people are paying more and more attention to environmental issues, and motor vehicle exhaust emissions account for about 20% to 25% on average. Nitrogen oxides (NOx) from diesel vehicles X ) will form highly toxic photochemical smog, which will cause damage to the human respiratory tract and lungs. In severe cases, it can cause emphysema. Hazards can cause chronic lung disease or carcinogenesis, and it is also an important cause of urban smog. There are many motor vehicles in our country, and there are also many pollutants emitted every year. These pollutants include nitrogen oxides, hydrocarbons, carbon monoxide, and particulate matter. Among the more than 57 million tons of pollutants emitted by motor vehicles in the coun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/8625B01D2251/20B01D2251/2067B01D2251/21
Inventor 罗永平
Owner 罗永平
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