A kind of preparation method of molecular sieve and its application and utilization method of waste water

Abstract

The invention discloses a preparation method of a molecular sieve, its application and a waste water utilization method. The method comprises the following steps: (1) uniformly mixing raw materials in water to obtain a mixture; (2) placing the mixture in a hydrothermal reaction kettle for crystallization, and after the crystallization is completed, solid-liquid separation to obtain solid products and mother liquor wastewater, Collecting the mother liquor wastewater; (3) washing, drying and calcining the solid product to obtain a molecular sieve; or adding the solid product to an ion exchange liquid containing copper ions for ion exchange, and then performing solid-liquid separation, washing, drying and calcining in sequence Molecular sieves are obtained after treatment; (4) repeating step (1), while recycling the mother liquor wastewater collected in step (2) and adding it to step (1), so that the raw material in step (1) comes from the mother liquor wastewater. The invention solves the technical problems of serious energy consumption and high production cost in wastewater treatment.

Description

Technical field [0001] The present invention belongs to the field of molecular sieve preparation, and more particularly to a method of preparing a molecular sieve and a method of utilizing the application and wastewater. Background technique [0002] The fuel economy of the diesel engine is high, the output is large, and the transportation industry is widely used, however, the diesel exhaust gas contains nitrogen oxide (NO x ), It is the main factor that causes acid rain and photochemical smoke, which is harmful to the environment. With the promotion of environmental awareness of global environment, countries around the world are increasingly strict. In order to solve the conflict between diesel use and environmental protection, the exhaust gas is purified to become a hot spot in today's society. [0003] Ammonia selective catalytic reduction (NH 3 -SCR) Nitrogen oxides have highly efficient and high economic, and become a relatively widely used denitration technology, and the co...

AI Technical Summary

Problems solved by technology

[0004] However, in the preparation process of Cu-based CHA-type molecular sieve and Cu-based AEI-type molecular sieve, a large amount of waste water will be produced without exception, and in order to promote the occurrence of the reaction and increase the crystallinity, an excessive amount of template agent is often added during the initial feeding. As a result, the wastewater produced not only contains a large amount of inorganic substances such as silicon, aluminum, and sodium salts that have not participated in the reaction, but also contains organic templates.

If the wastewater is discharged directly, it will cause damage to the environment. If the wastewater treatment system is established separately, the production cost will be greatly increased and the process of industrial scale-up will be hindered.

Therefore, how to solve the serious energy consumption and high production cost of wastewater treatment is the problem faced by R & D personnel at present.

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