Abstract:
Objective To address the issues of high regeneration energy consumption and solvent degradation in amine carbon capture technology, an efficient and energy-saving absorption solvent and its corresponding process were studied to reduce operating costs.
Method First, by analyzing the reaction mechanisms and energy consumption characteristics of different solvents, a multi-component composite solvent, CT8-23B, was developed. Second, a pH-regulation-assisted regeneration process was introduced, in which a weak-acid salt was used to establish a buffer system to accelerate desorption. Third, the energy-saving performance of interstage cooling, mechanical vapor recompression, and other processes was evaluated.
Result Compared with 30 wt% MEA, the CT8-23B solvent exhibited a comparable CO2 absorption rate. In addition, the saturated absorption capacity was increased by 27%, the desorption rate was increased by 100%, and the regeneration energy consumption was reduced by about 30%. Furthermore, the pH-regulation-assisted regeneration process can further enhance the regeneration performance and reduce energy consumption.
Conclusion The combination of the CT8-23B solvent with energy-saving processes such as the pH-regulation-assisted regeneration process can significantly reduce the energy consumption of the carbon capture process, and has good industrial application and retrofit potential, providing a low-cost carbon capture technology solution.
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