Comb-shaped polyacrylamide crystal growth disrupting agent, crystallization-resistant type tail gas catalytic reducing agent prepared from disrupting agent and preparation method

Abstract

The invention discloses a comb-shaped polyacrylamide crystal growth disrupting agent, a crystallization-resistant type tail gas catalytic reducing agent prepared from the disrupting agent and a preparation method. The growth disrupting agent is polyacrylamide-co-polyoxyethylene polyoxypropylene methacrylic acid ester, and the tail gas catalytic reducing agent comprises a dispersing agent, Adblue, the crystal growth disrupting agent and the balance of pure water. The preparation method of the crystal growth disrupting agent comprises steps as follows: the crystal growth disrupting agent, the dispersing agent and Adblue are uniformly mixed, purified and separated, and the total nitrogen is regulated. The comb-shaped polyacrylamide crystal growth disrupting agent has the advantages as follows: the prepared crystal growth disrupting agent can effectively inhibit urea crystal growth, the tail gas catalytic reducing agent prepared through combination with the dispersing agent and the like can effectively reduce acting force between urea molecules, the precipitation time and the precipitation quantity of urea crystals are controlled, the red-light-on period caused by crystallization when the urea solution is adopted by vehicles meeting the national IV-stage emission standard is greatly prolonged, and meanwhile, the preparation method is easy and practicable and is implemented easily.

Description

technical field [0001] The invention belongs to the field of automobile exhaust catalytic reducing agents, in particular to an anti-crystallization exhaust catalytic reducing agent and a preparation method thereof. Background technique [0002] Global energy shortages, climate warming, and environmental protection are becoming increasingly severe. The harm of nitrogen oxides (NOx) and particulate matter (PM) emitted by diesel vehicles to human health and the atmospheric environment has attracted great attention. At present, the world's major developed countries are in full swing to introduce more stringent vehicle exhaust emission control standards. [0003] A large number of experimental studies have shown that the current selective catalytic reduction technology can solve the exhaust emission problem of diesel vehicles, and this technology must use an exhaust catalytic reduction agent (commonly known as vehicle urea solution) to treat the NOx in the exhaust gas. Catalyti...

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Problems solved by technology

However, during the long-mileage use of urea for vehicles, a series of problems gradually appeared, such as blockage of the nozzle of the SCR system, crystallization blockage at the vortex of the pipeline, crystallization of the pipeline, and frequent lighting of SCR fault lights, which caused the SCR system to fail to work normally. Only by disposing of the crystals at the nozzle can the SCR system run normally, so that the exhaust emission can reach the standard

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