Work

Synergistic Resource Utilization of Carbon Dioxide-Rich Off-Gas and Industrial By-Product Alkaline Salt

Year: 2026

Type: article

Abstract: The capture and utilization of carbon dioxide (CO2) from CO2-rich off-gas streams play a vital role in mitigating carbon emissions. Chemical absorption, as a well-established and commercially deployed CO2 capture technology, has attracted sustained research interest. Current efforts in this field are primarily directed toward developing cost-effective absorbents and energy-efficient processes. Meanwhile, industrial operations generate significant quantities of by-product alkaline salts, which often consist of mixtures containing two or more components such as sodium carbonate, sodium hydroxide, sodium sulfate, and sodium chloride. The use of these alkaline by-products for CO2 absorption to produce value-added chemicals presents a promising and economically attractive carbon capture and utilization (CCU) strategy. In this work, an industrial salt by-product from a petrochemical plant, rich in sodium carbonate and sodium sulfate, was employed as an absorbent to simulate a CCU process. By controlling the mass transfer and crystallization behavior of CO2 within the multicomponent system during carbon capture, it was feasible to produce sodium bicarbonate from CO2. Concurrently, industrial-grade sodium sulfate was separated based on solubility differences. This study proposes an innovative integrated approach that combines the utilization of alkaline by-product salts, CO2 capture from off-gas, and resource recovery in a single process.

Source: Processes

DOI: 10.3390/pr14101565

Authors: Guodong Yao, Qiuxia Zhu, Limin Jin, Ningzheng Zhu, Yangyuan Zhou, Jianfu Zhao

Institutions: Tongji University, State Key Laboratory of Pollution Control and Resource Reuse

Language: English

Topic: Carbon Dioxide Capture Technologies

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Climate action, Responsible consumption and production, Affordable and clean energy

Open Access status: gold

Estimated APC paid: $2,896