阳离子膜电解再生沼气脱碳吸收液的研究

Study of recover the solution after absorbing CO_2 in marsh gas with cation-selective membrane electrodialysis

本研究采用不同浓度比的碳酸氢钠和碳酸钠模拟吸收富液,用阳离子交换膜组成单膜两室膜电解装置,对吸收液进入阳极室分离钠离子脱碳再生进行了研究.结果表明,膜电解操作须在2.5 V以上进行;吸收液中的碳酸根离子首先向碳酸氢根转变,而后碳酸氢根向碳酸转化进一步释放出二氧化碳;高压操作时,当吸收液pH值变为8.3左右,出口液pH值发生突变.

This research takes carbon out to regenerate the simulant fertile liquor, which makes up by different concentration of sodium bicarbonate and sodium carbonate, by using the cation-selective membrane electrolysis technology. Conclusions are ： 1 ） The operation voltage should exceed 2.5 V; 2） Carbonate transform into bicarbonate, and the bicarbonate turn to carbon dioxide which will flee from liquor under low pH;3） Under high voltage, when pH value close to 8.3, effluent pH drop rapidly.