Production process for tail gas catalytic reducer

Abstract

The invention relates to a production process for a tail gas catalytic reducer, in particular a production process for a tail gas catalytic reducer of vehicles, and belongs to the technical field of chemical engineering. In the production process, the continuous filtration and ion exchange technology is adopted; attributes of different impurities of the traditional urea are utilized; through continuous purification and exchange adsorption of metallic and nonmetallic ions, the common urea is subjected to vehicle-grade purification, so that the common urea is prepared into the high-purificationtail gas catalytic reducer through trough-type continuous purification and ion exchange process to ensure normal work of an SCR system. Compared with the traditional crystallization process, the production process has the advantages that: the innovative process method is adopted, chemical agents are not needed, zero emission is achieved, the production is continuous and the operation is simple. On the premise of ensuring low cost, energy conservation and environmental protection, the tail gas catalytic reducer, namely AUS32, with stable quality can be produced, and a foundation for supplying raw materials is laid for wide-range promotion of the domestic SCR system.

Description

technical field [0001] The invention relates to a production process of a catalytic reducing agent, in particular to a production process of a catalytic reducing agent for vehicle tail gas, and belongs to the technical field of chemical industry. Background technique [0002] At present, the tail gas catalytic reduction agent suitable for SCR technology-vehicle urea solution (AUS32) has high requirements on a series of indicators such as metal elements, while the content of metal elements in ordinary urea is relatively high, and direct use of ordinary urea aqueous solution will quickly make SCR System failure, or even irreversible damage to the entire system. Therefore, ordinary urea solution cannot meet the requirements of SCR technology as an exhaust gas catalytic reducer. In foreign countries, the preparation of tail gas catalytic reducing agent begins with the synthesis of urea, and various indicators are strictly controlled to ensure that the technical indicators of ta...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is: Aiming at the defects that ordinary urea cannot be used as tail gas catalytic reducing agent and the existing domestic production process, a tail gas catalytic reducing agent production process is proposed to replace the crystallization process and produce tail gas catalytic reducing agent at low cost