Method for treating high-ammonia-nitrogen sewage in catalytic cracking catalyst production

By optimizing the treatment process of high ammonia nitrogen wastewater in the production of catalytic cracking catalysts, including pretreatment, decomposition and hardening, membrane concentration treatment, deamination and decomposition of nitrogen and falling film evaporation and crystallization, the problems of energy waste and high treatment costs in the existing technology are solved, and efficient and economical wastewater treatment effects are achieved.

CN119707145AActive Publication Date: 2025-03-28PETROCHINA(CHANGTING)CATALYST CO LTD
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Patent Information

Application Number
CN202411644800.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-18
Publication Date
2025-03-28
Estimated Expiration
2044-11-18

AI Technical Summary

Technical Problem

The existing high ammonia nitrogen wastewater treatment methods in the production of catalytic cracking catalysts have a lot of unnecessary energy waste and high treatment costs, which are not conducive to sustainable development.

Method used

An optimized high ammonia nitrogen wastewater treatment method is proposed, including pretreatment, decomposition and hardening, membrane concentration treatment, deamination and decomposition of nitrogen and declining film evaporation and crystallization. By reducing temperature-cooling-warming operations, it improves treatment efficiency and reduces energy consumption.

Benefits of technology

The effective treatment of high ammonia nitrogen wastewater is achieved, the amount of ammonia nitrogen treatment is reduced, the scaling problems of the composite stripping deamination tower is solved, the steam consumption and treatment cost are reduced, and the treatment efficiency is significantly improved.

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Abstract

The invention relates to the technical field of high-ammonia-nitrogen sewage treatment, in particular to a method for treating high-ammonia-nitrogen sewage in catalytic cracking catalyst production, which comprises the steps of pretreatment of high-ammonia-nitrogen sewage, impurity removal and hardness removal of the high-ammonia-nitrogen sewage, membrane concentration treatment of the high-ammonia-nitrogen sewage, ammonia-nitrogen removal treatment of the high-ammonia-nitrogen sewage and falling film evaporative crystallization of the sewage after ammonia-nitrogen removal. According to the invention, the treatment steps of high-ammonia-nitrogen sewage generated by preparing a molecular sieve in the production process of a catalytic cracking catalyst are optimized, so that the amount of high-ammonia-nitrogen sewage subjected to ammonia-nitrogen removal treatment is reduced by half, and the problems of scaling of a tray and a filler of a composite steam stripping deamination tower and overtemperature of a disc tube type reverse osmosis membrane during summer operation are solved; meanwhile, the temperature of the sewage entering the MVR unit is also increased, the steam consumption is reduced, and the cost for treating the high-ammonia-nitrogen sewage is remarkably reduced.
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Citation Information

Patent Citations

  • Stripping ammonia-removing method based on flash evaporation and heat pump technologies

    CN102190341A

  • Treatment process for realizing zero emission and resource recycling of catalyst wastewater

    CN107235590A

  • Composite steam stripping ammonia-removing tower

    CN202246318U