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
View PDF7 Cites 12 Cited by
  • 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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of AdBlue
  • Preparation method of AdBlue
  • Preparation method of AdBlue

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0032] Example 1

[0033] Such as figure 1 , figure 2 As shown, the carbon dioxide and ammonia (10°C, 3MPa) of the raw materials under normal temperature and pressure are sent to the urea synthesis tower under pressure at a molar ratio of 1:3.6, and reacted at 188°C to synthesize excess ammonia and unconverted formaldehyde in the reaction solution. Ammonium is vaporized and decomposed by stripping gas. The product is 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 process of preparing high-purity water in the process of preparing urea for vehicles. 230 kilograms of industrial water were subjected to ultrafiltration (ultrafiltration membrane group), reverse osmosis (reverse osmosis membrane group), TOC removal (total organic carbon remover), deoxygenation, continuous electrolytic salt (EDI), TOC removal, filtration ( Precision filter) to remove ions in the water to obtain 221 kg o...

Example Embodiment

[0035] Example 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 reacted at 195°C. The excess ammonia and unconverted ammonia in the reaction solution are synthesized. Ammonium is vaporized by stripping gas and decomposed. The product is pre-concentrated in vacuum and separated by evaporation to obtain 1000 kg of 99.75% (wt.) molten urea (140°C, 1.3MPa). Pass 2300 kg of industrial water through ultrafiltration (ultrafiltration membrane group), reverse osmosis (reverse osmosis membrane group), TOC removal (total organic carbon remover), deoxygenation, continuous electrolysis salt (EDI), TOC removal, filtration ( Precision filter) to remove ions in the water to 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 , The parameter standards refer to the national standard GB / T114...

Example Embodiment

[0038] Example 3

[0039] Feed the raw material carbon dioxide (20℃, 1MPa) and ammonia (-15℃, 3MPa) into the urea synthesis tower at a pressure ratio of 1:4.0, and react at 160℃ to synthesize excess ammonia and unconverted methylammonium in the reaction solution. It is vaporized and decomposed by stripping gas. The product is pre-concentrated in vacuum and separated by evaporation to obtain 300 kg of 99.75% (wt.) molten urea (120°C, 1.8MPa). 650 kilograms of industrial water were respectively subjected to ultrafiltration (ultrafiltration membrane group), reverse osmosis (reverse osmosis membrane group), TOC removal (total organic carbon remover), deoxidation, continuous electrolytic salt (EDI), TOC removal, filtration ( Precision filter) to remove ions in the water to obtain 632 kilograms of high purity water (main parameters: resistivity 20MΩ·cm, copper -1 .

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap