Automotive urea for preventing generation of urea biuret, cyanuric acid and melamine intermediate products and preparation method thereof

A technology of cyanuric acid and melamine, which is used in the preparation of urea derivatives, the preparation of organic compounds, chemical instruments and methods, etc. The effect of large conversion rate, improved conversion rate, and improved conversion rate

Inactive Publication Date: 2020-12-22
HENAN HONGKANG ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a kind of vehicle urea and its preparation method which prevents the generation of urea biuret, cyanuric acid and melamine intermediate products, to solve the existing urea NO X The conversion rate is low, the fuel consumption of automobiles is increased, and the exhaust emissions are not up to the technical problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: A kind of vehicle urea that prevents urea biuret, cyanuric acid and melamine intermediate product from generating, described urea comprises following components by weight, 10 parts of urea, 19 parts of ammonium sulfate, 4 parts of ethanolamine, alkane 0.5 part of glucoside, 100 parts of ultrapure water, and 0.8 part of nanocatalyst; wherein, the preparation method of nanocatalyst is as follows:

[0027] 1) Take ammonium metavanadate and citric acid of equal mass, prepare a solution with a mass fraction of 1.0% with deionized water, add 0.50% sodium metaaluminate according to the mass of the solution, and add nano-scale WO during the stirring process 3 / TiO 2 The mixture powder was ultrasonically oscillated for 45 minutes, put into a temperature-controlled electric furnace and roasted at a high temperature of 560°C for 2 hours, then cooled naturally to room temperature, and then frozen at -5°C for 30 minutes;

[0028] 2) The material obtained in step 1) wa...

Embodiment 2

[0036] Embodiment 2: the difference with embodiment 1 is:

[0037] A kind of urea for vehicles that prevents the generation of urea biuret, cyanuric acid and melamine intermediate products, the urea includes the following components by weight, 13 parts of urea, 23 parts of ammonium sulfate, 7 parts of ethanolamine, 1.5 parts of alkyl glucoside 1 part, 100 parts of ultrapure water, 1 part of nano-catalyst; Wherein, the preparation method of nano-catalyst is as follows:

[0038] 1) Take ammonium metavanadate and citric acid of equal mass, prepare a solution with a mass fraction of 1.0% with deionized water, add 0.45% sodium metaaluminate according to the mass of the solution, and add nano-scale WO during the stirring process 3 / TiO 2 The mixture powder was ultrasonically oscillated for 20 minutes, put into a temperature-controlled electric furnace and roasted at a high temperature of 550°C for 1.5 hours, then cooled naturally to room temperature and then frozen at -5°C for 20 m...

Embodiment 3

[0047] Embodiment 3: the difference with embodiment 1 is:

[0048] A kind of urea for vehicles that prevents the formation of urea biuret, cyanuric acid and melamine intermediate products, the urea includes the following components in parts by weight: 10-13 parts of urea, 19-23 parts of ammonium sulfate, and 4-7 parts of ethanolamine , 0.5 to 1.5 parts of alkyl glucoside, 100 parts of ultrapure water, and 0.8 to 1 part of nanocatalyst; wherein, the preparation method of nanocatalyst is as follows:

[0049] 1) Take ammonium metavanadate and citric acid of equal mass, prepare a solution with a mass fraction of 0.9-1.0% with deionized water, add 0.45-0.50% sodium metaaluminate according to the mass of the solution, and add nano-scale WO 3 / TiO 2 The mixture powder is ultrasonically oscillated for 20-45 minutes, put into a temperature-controlled electric furnace and roasted at a high temperature of 550-560°C for 1.5-2 hours, then naturally cooled to room temperature and then fro...

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Abstract

The invention discloses automotive urea for preventing generation of urea biuret, cyanuric acid and melamine intermediate products and a preparation method thereof. The preparation method comprises the following steps: 1) enabling high-purity ammonia and carbon dioxide to sequentially pass through a first reactor and a second reactor for reaction at high temperature and high pressure; collecting and compressing gas in the second reactor and then enabling the gas to pass through the first reactor again, and collecting liquid urea melt fluid in the first reactor and the second reactor; (2) carrying out flash evaporation on the liquid urea melt to remove ammonia and CO2, adding high-purity water with the temperature of 75-80 DEG C, uniformly mixing to obtain a urea saturated solution, collecting gas subjected to flash evaporation treatment, and introducing the gas into the first reactor; (3) filtering the urea aqueous solution obtained in the step (2) by using a filter membrane with the pore diameter of 0.2-0.5 mu m, and (4) putting the urea saturated solution obtained in the step (3) into a multi-stage liquid membrane crystallization kettle so as to solve the problems of low production efficiency, low utilization rate, low purity, high production cost and the like in the existing production process.

Description

technical field [0001] The invention relates to the technical field of production of urea solution for vehicles, in particular to a urea for vehicles which prevents the formation of intermediate products of urea biuret, cyanuric acid and melamine and a preparation method thereof. Background technique [0002] Urea for vehicles is a high-purity urea solution developed in recent years and suitable for SCR systems (selective catalytic reduction systems). After gasification, urea solution decomposes to produce NH 3 , under the action of catalyst, NH 3 with NO in the exhaust X The reaction produces harmless H 2 O and N 2 . [0003] However, the content of nitrogen oxides, sulfur oxides and soot in the exhaust gas of vehicle diesel engines is different, and urea is decomposed into NH 3 The intermediate product isocyanic acid in the process is easy to react with urea or biuret in the solution to generate cyanuric acid which is difficult to decompose. At a higher temperature, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C273/04C07C273/16B01J23/30B01D53/94B01D53/56F01N3/20
CPCC07C273/04C07C273/16B01J23/30B01J23/002B01D53/9409B01D53/9418F01N3/2066B01J2523/00B01D2251/2067B01D2258/012F01N2610/02B01J35/40B01J2523/47B01J2523/55B01J2523/69Y02P20/141Y02P20/151
Inventor 李丰登孙长城桑书梅
Owner HENAN HONGKANG ENVIRONMENTAL PROTECTION TECH
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