A method for purifying nitrogen-containing volatile organic compounds and NO in waste gas x Methods and purification systems

By using nitrogen-containing volatile organic compounds to reduce NOx to N2 in waste gas and using an oxidation catalyst that does not contain precious metals, the problems of complex processes and secondary pollution in existing technologies are solved, and a low-cost and high-efficiency waste gas purification effect is achieved.

CN117919931BActive Publication Date: 2026-07-24CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2022-10-26
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies for treating nitrogen-containing volatile organic compounds and NOx are complex and may be accompanied by secondary pollution from ammonia leaks. They are costly and require significant investment, and cannot be effectively avoided.

Method used

By reducing NOx to N2 using nitrogen-containing volatile organic compounds in waste gas, without the need for additional NH3 as a reducing agent, and using an oxidation catalyst free of precious metals, combined with specific process parameter control, the purification of nitrogen-containing volatile organic compounds and NOx in waste gas can be achieved.

Benefits of technology

With low material consumption and low cost, it achieves efficient purification of nitrogen-containing volatile organic compounds and NOx in exhaust gas, avoiding the addition of additional reducing agents and secondary pollution, and simplifying the process flow.

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Abstract

This invention discloses a method and purification system for purifying nitrogen-containing volatile organic compounds and NOx in waste gas, relating to the field of waste gas purification technology, including the following steps: (1) removing nitrogen-containing volatile organic compounds and NOx from waste gas. x (1) Add free oxygen-containing gas to the waste gas and heat the mixture to obtain the hot waste gas stream to be treated; (2) React the hot waste gas stream to be treated with an oxidation catalyst to remove nitrogen-containing volatile organic compounds and NO from the hot waste gas stream to be treated. x The purified exhaust airflow is obtained. This invention employs a catalytic purification method, which can simultaneously remove nitrogen-containing volatile organic compounds and NO from the exhaust gas. x By controlling parameters such as reaction temperature, gas flow rate, and contact time between the gas and the oxidation catalyst, the goal of highly efficient waste gas purification is achieved. This technical solution does not require additional reducing agent to reduce NO. x By using an oxidation catalyst to combine nitrogen-containing volatile organic compounds in the waste gas as a reducing agent, NO can be removed. x Convert to N2.
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