硼酸活化碳酸钾溶液吸收CO₂的研究

Study on CO₂ Absorption with Aqueous Potassium Carbonate Solution Promoted by Boric Acid

摘要: 加入活化剂是提高碳酸钾溶液吸收CO₂速率的有效方法。在湿壁柱中研究不同活化碳酸钾溶液吸收CO₂的效果基础上，考察了不同硼酸浓度对碳酸钾吸收CO₂速率的影响，测定了活化液的气液平衡数据。结果表明加入硼酸能够明显提高CO₂吸收速率，3 wt%硼酸可将总传质系数提高约80%；碳酸钾溶液随着温度升高CO₂平衡分压升高，加入硼酸后比相同条件下碱液的CO₂平衡分压略低，有利于二氧化碳吸收。

Abstract:

The addition of promoter into aqueous potassium carbonate solution is one of the effective ways to enhance the CO₂ absorption rate. In this work, the CO₂ absorption rates were investigated for aqueous carbonate solution promoted by different addictives in a wetted wall column. The effect of concentration of boric acid on the overall gas-phase mass transfer coefficient and vapor-liquid equilibrium data was discussed. Results showed that the addition of boric acid can significantly enhance the CO₂ absorption rate. The overall mass transfer coefficient increased by 80% with the addition of 3 wt% boric acid. CO₂ partial pressure increased with the increasing temperature of aqueous potassium carbonate. However it decreased when boric acid was added, which would be favorable for CO₂ absorption.