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Production process and system for preparation of automobile urea solution from industrial urea

A technology for vehicle urea and production process, applied in the field of chemical process, can solve the problems of reverse osmosis membrane flux and anti-pollution performance limiting production capacity, product quality is difficult to meet requirements, complex filtration and purification processes, etc. The effect of mass production, sufficient and stable market supply, and meeting the needs of small batch orders

Inactive Publication Date: 2018-04-20
CHINA TIANCHEN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The filtration and purification process of the above-mentioned (2) route is complicated, the equipment investment cost is high, and the reverse osmosis membrane flux and anti-pollution performance of the filtration process limit its production capacity
The (3) route is only suitable for large-scale chemical enterprises that produce urea, and the product contains high impurities such as ammonia, formaldehyde, and diuresis, and the product quality is difficult to meet the requirements

Method used

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  • Production process and system for preparation of automobile urea solution from industrial urea
  • Production process and system for preparation of automobile urea solution from industrial urea
  • Production process and system for preparation of automobile urea solution from industrial urea

Examples

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Embodiment 1

[0074] The production technology raw material of present embodiment is industrial urea qualified product, and wherein biuret content is 1%, and insoluble matter content is 400ppm, and alkalinity (as NH 3 Total) is 300ppm, iron content is 10ppm, and all the other components are urea.

[0075] The raw material is mixed with ultrapure water in the dissolving kettle 21 and dissolved in the water. The operating temperature of the dissolving kettle 21 is 60-80° C. and the operating pressure is normal pressure. Heating steam is fed into the outer coil of the dissolution kettle 21 to provide a heat source for the dissolution process, and the steam condensate is recovered through the pipeline. The dissolving process was about 1.5 hours, and the upper layer urea solution was pumped into the crystallizer 24.

[0076] The industrial urea solution from the dissolution tank 21 is mixed with the circulating liquid of the crystallizer 24 and then enters the tube side of the crystallization c...

Embodiment 2

[0082] For the production process involved in the present invention, the operation process of embodiment 2 is the same as that of embodiment 1. The difference between embodiment 2 and embodiment 1 is: the raw material is industrial urea first grade product, wherein biuret content is 0.9%, insoluble matter content is 100ppm, alkalinity (in NH 3 Total) is 200ppm, iron content is 5ppm, and all the other components are urea.

[0083] In the final vehicle urea solution, the urea content is 32.5% (mass fraction), and the water content is 67.5% (mass fraction), wherein the biuret content is no more than 0.3% (mass fraction), and the insoluble matter content is no more than 10ppm. (in NH 3 Total) does not exceed 15ppm, iron content does not exceed 0.3ppm, and all indicators meet the requirements of the Beijing local standard DB11 / 552-2008 "Urea Solution for Vehicles".

[0084] The NOx conversion rate of the prepared vehicle urea solution is 97%, and the NOx emission meets the requir...

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Abstract

The invention provides a production process and system for preparation of an automobile urea solution from industrial urea. The production process includes the steps of: S1, mixing the raw material industrial urea with ultrapure water to dissolve industrial urea completely in ultrapure water so as to obtain an industrial urea solution; S2, mixing the industrial urea solution with a crystallizer circulation liquid, then letting the mixture enter an external crystal cooler tube pass for cooling; S3, sending the cooled industrial urea solution and crystallizer circulation liquid mixed solution into a crystallizer; S4, subjecting the crystallizer bottom slurry to cooling crystallization, then drying the crystal in a continuous airflow dryer, thus obtaining qualified automobile urea particles;and S5, blending a certain amount of automobile urea particles with ultrapure water gradually to obtain an automobile urea solution. The production process for preparation of an automobile urea solution from industrial urea provided by the invention adopts cheap industrial urea as the raw material, has the advantages of short technological process, simple equipment, and convenient operation, and is suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering process, and in particular relates to a production process and system for preparing vehicle urea solution from industrial urea. 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,...

Claims

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Application Information

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IPC IPC(8): B01D53/90B01D53/56B01F7/18B01F15/00B01F15/04B01F1/00C07C273/16
CPCB01D53/8625B01D53/90C07C273/16B01D2251/2067B01F21/10B01F27/074B01F27/90B01F35/1453B01F35/881
Inventor 程庆来李发源杜杏罗佳琦
Owner CHINA TIANCHEN ENG
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