Multi-stage purification method and system for absorbent in carbon capture waste liquid

By combining multi-stage physical separation with chemical conditioning, the problem of low absorbent purity and recovery rate in carbon capture wastewater was solved, achieving efficient resource recycling, reducing energy consumption and operating costs, and improving system stability and product quality.

CN122273308APending Publication Date: 2026-06-26ZHEJIANG SAIPU SEPARATION EQUIPMENT CO LTD
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Patent Information

Application Number
CN202610545412.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-23
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

In existing technologies, the treatment methods for carbon capture waste liquid are difficult to effectively improve the purity and recovery rate of absorbents, and the level of energy consumption control and continuous operation needs to be optimized.

Method used

The method combines multi-stage physical separation with chemical conditioning, including pretreatment, multi-stage filtration, primary deweighting, distillation purification and deep purification. Through the synergistic effect of chemical conditioning agents and physical filtration, complex degradation products in the waste liquid are removed first. The operating temperature is reduced by using a vacuum environment, and key parameters are automatically adjusted by the control unit. Energy recycling is achieved by combining with a heat pump recovery unit.

Benefits of technology

It significantly improves the purity and recovery rate of the regenerated absorbent, reduces operating costs, reduces hazardous waste emissions, and enhances system stability and product quality consistency, resulting in significant economic benefits and environmental value.

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Abstract

The invention relates to the technical field of carbon capture waste liquid treatment, in particular to a multi-stage purification method and system for an absorbent in carbon capture waste liquid. The method comprises the following steps: executing the steps of waste liquid pretreatment, multi-stage filtration, primary heavy component removal, rectification purification and terminal deep purification; the system comprises a pretreatment unit, a multi-stage filtration unit, a heavy component removal unit, a rectification unit, a deep purification unit and a control unit. Degradation products are removed through cooperation of chemical conditioning and physical filtration, effective components are thoroughly separated through primary heavy component removal and rectification classification, and the operation temperature is reduced in combination with the vacuum environment so as to slow down secondary degradation. The method can solve the problem that a single means is difficult to consider both product purity and recovery rate, significantly improves the purity of the regenerated absorbent, realizes efficient resource regeneration of the waste liquid, reduces system energy consumption and operation cost, and has significant economic and environmental protection values.
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