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Preparation method of AdBlue

A technology for vehicle urea and urea, which is applied in the preparation of organic compounds, the preparation of urea derivatives, chemical instruments and methods, etc., can solve the problems of high price and cost of urea, high energy consumption, and disconnected production processes and production processes, and achieve good Application prospect, environmental pollution reduction, low cost effect

Inactive Publication Date: 2015-02-11
INNOVATIVE COAL CHEMICAL DESIGN INSTITUTE (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the dissolution process is an endothermic reaction, which consumes a lot of energy. In addition, the price and cost of commercially available urea are high, and the transportation cost is high. The quality of urea from different manufacturers and batches varies, and the transportation process will also cause pollution of raw materials. Various problems of storage and quality assurance, the production process is also out of touch with the production process of ordinary urea
[0007] A method for preparing urea for vehicles is disclosed in Chinese patent application CN102806011A. The urea raw material selected in this patent comes from the urea synthesis reaction liquid in the urea synthesis tower. Although the content of biuret is very low, the reaction liquid It is difficult to measure and control the composition and content of unreacted raw materials, by-products, and impurities in the reaction solution, and it is still necessary to remove other components and perform steps such as crystallization and dissolution.

Method used

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  • Preparation method of AdBlue
  • Preparation method of AdBlue
  • Preparation method of AdBlue

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Such as figure 1 , figure 2 As shown, carbon dioxide and ammonia (10°C, 3MPa) at normal temperature and pressure are sent to the urea synthesis tower under pressure at a molar ratio of 1:3.6, and react at 188°C. The excess ammonia and unconverted formazan in the synthesis reaction liquid The ammonium was stripped and decomposed, and the product was pre-concentrated in vacuum and separated by evaporation to obtain 110 kg of 99.75% (wt.) molten urea (130°C, 1MPa). Such as image 3 Shown is the flow chart of the preparation of high-purity water during the preparation of urea for vehicles. 230 kg of industrial water was subjected to ultrafiltration (ultrafiltration membrane group), reverse osmosis (reverse osmosis membrane group), removal of TOC (total organic carbon remover), deoxidation, continuous electrolytic desalination (EDI), removal of TOC, filtration ( precision filter) to remove ions in the water and obtain 221 kg of high-purity water (main parameters: resist...

Embodiment 2

[0036] The raw material carbon dioxide (40°C, 0.2MPa) and ammonia (0°C, 2.3MPa) are sent to the urea synthesis tower under pressure at a molar ratio of 1:5.0, and react at 195°C. The excess ammonia and unconverted formazan in the synthesis reaction liquid Ammonium was stripped and decomposed, and the product was pre-concentrated in vacuum and separated by evaporation to obtain 1000 kg of 99.75% (wt.) molten urea (140°C, 1.3MPa). 2300 kg of industrial water was subjected to ultrafiltration (ultrafiltration membrane group), reverse osmosis (reverse osmosis membrane group), removal of TOC (total organic carbon remover), deoxidation, continuous electrolytic desalination (EDI), removal of TOC, filtration ( precision filter) to remove ions in the water and obtain 2145 kg of high-purity water (main parameters: resistivity 20MΩ cm, copper<0.2μg / L, zinc<0.2μg / L, potassium<0.5μg / L, phosphate <1μg / L , refer to the national standard GB / T11446.1-1997 for parameter standards); then 2145 kg ...

Embodiment 3

[0039]The raw material carbon dioxide (20°C, 1MPa) and ammonia (-15°C, 3MPa) are sent to the urea synthesis tower under pressure at a molar ratio of 1:4.0, and react at 160°C to synthesize excess ammonia and unconverted methylammonium in the reaction liquid It was stripped and decomposed, and the product was pre-concentrated in vacuum and separated by evaporation to obtain 300 kg of 99.75% (wt.) molten urea (120°C, 1.8MPa). 650 kg of industrial water was subjected to ultrafiltration (ultrafiltration membrane group), reverse osmosis (reverse osmosis membrane group), removal of TOC (total organic carbon remover), deoxidation, continuous electrolytic desalination (EDI), removal of TOC, filtration ( precision filter), remove ions in water, and obtain 632 kg of high-purity water (main parameters: resistivity 20MΩ cm, copper-1 .

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Abstract

The invention relates to a preparation method of AdBlue. The method comprises the following steps: 1, carrying out pressurizing sending on carbon dioxide and ammonia into a urea synthesis tower, and reacting at 150-200DEG C to obtain a synthetic reaction solution; 2, carrying out stripping, steaming and decomposition on excess ammonia and unconverted methylamine; 3, carrying out vacuum pre-concentration and evaporation separation on the synthetic reaction solution to obtain molten urea; 4, treating industrial water to obtain highly pure water; 5, mixing the molten urea with the highly pure water to prepare crude AdBlue; and 6, carrying out ultrafiltration treatment on the crude AdBlue to obtain the AdBlue. The method simplifies present production technologies, allows the AdBlue with high added values to be produced through original production technologies, allows the quality level of theobtained AdBlue to meet or exceed all present quality standards of AdBlue, reduces the cost, and reduces the environmental pollution.

Description

technical field [0001] The invention belongs to the field of nitrogen oxide removal, in particular to a preparation method of urea for vehicles. Background technique [0002] Vehicles with diesel engines are widely used in industries such as medium and large passenger cars, medium and heavy trucks, and special-purpose vehicles because of their excellent fuel economy and power performance. However, the tail gas emitted by automobiles using diesel engines contains a large amount of harmful gas emissions, such as carbon monoxide, hydrocarbons and nitrogen oxides. [0003] Selective Catalytic Reduction Technology (SCR) is a widely used industrial waste gas nitrogen oxide emission reduction technology. Based on this technology, the improved Vehicle Ammonia Selective Catalytic Reduction Technology (Urea-SCR) can realize the reduction of nitrogen in automobile exhaust. Effective removal of oxides. Urea-SCR technology uses nitrogen oxides to react with vehicle exhaust reducing age...

Claims

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Application Information

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IPC IPC(8): C07C273/04
CPCY02P20/141
Inventor 潘凡峰刘超汪雍张毅钐
Owner INNOVATIVE COAL CHEMICAL DESIGN INSTITUTE (SHANGHAI) CO LTD
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