Maleic anhydride tail gas purification system and system for preparing maleic anhydride

The maleic anhydride tail gas purification system, which incorporates multi-stage washing and heat recovery, solves the problems of organic acid corrosion and n-butane loss in the tail gas, achieving safe separation and resource recovery of the tail gas, and improving the economic efficiency and safety of chemical production.

CN224404782UActive Publication Date: 2026-06-26HUIZHOU YUXIN NEW MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
HUIZHOU YUXIN NEW MATERIALS CO LTD
Filing Date
2025-07-28
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In existing technologies, maleic anhydride tail gas contains corrosive organic acids and poses an explosion risk, leading to equipment corrosion and safety hazards. Furthermore, the loss of unreacted n-butane is significant, affecting catalyst selectivity and lifespan.

Method used

The maleic anhydride tail gas is subjected to multi-stage washing and heat recovery by a series of first scrubbing tower, compression unit, heat exchange unit and second scrubbing tower. Organic acid and unreacted n-butane are separated by countercurrent contact and multi-stage heat exchange, and the heat source in the heat exchange unit is used rationally.

Benefits of technology

It effectively separates organic acids from exhaust gas, avoids equipment corrosion, improves the recovery and utilization rate of n-butane, reduces losses, enhances system safety and economic efficiency, and achieves energy conservation and consumption reduction.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a maleic anhydride tail gas purification system and the system of preparation maleic anhydride relates to the technical field of chemical production. Including first washing tower, compression unit, heat exchange device and second washing tower that are connected in turn, and the outlet of second washing tower and the inlet of gas -gas heat exchange medium passage of heat exchange device form loop, and the outlet of gas -gas heat exchange medium passage is configured as with maleic anhydride reaction system through pipeline intercommunication, to make maleic anhydride tail gas flow through first washing tower, compression unit, heat exchange device and second washing tower in proper order, and after two times washing, after heat exchange in heat exchange device, exhaust. The system not only can recycle and utilize the n-butane that is not completely reacted in maleic anhydride tail gas, reduces the loss of n-butane, improves economic efficiency, and can avoid organic acid and other byproducts and n-butane return to reactor system together, avoids equipment corrosion, improves system safety. Simultaneously through to the effective utilization of heat, has the effect of energy -conserving and loss -reducing.
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