Heat of absorption of CO2 in aqueous ammonia, piperazine solutions and their mixtures
Heat of absorption of CO2 in aqueous ammonia, piperazine solutions and their mixtures
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DOI：
10.1016/j.ijggc.2012.03.013
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发表时间：
2012-07
影响因子：
3.9
通讯作者：
Jinzhao Liu;Shujuan Wang;H. Svendsen;Muhammad Idrees;Inna Kim;Chang-he Chen
中科院分区：
文献类型：
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作者：
Jinzhao Liu;Shujuan Wang;H. Svendsen;Muhammad Idrees;Inna Kim;Chang-he Chen
用CPA-122型反应量热计测定了CO_2在5wt%NH_3（aq）、0.86mol PZ和（1.5-3.1mol）NH_3/（0.43-0.86mol）PZ混合溶液中40 ℃、60 ℃和80 ℃时的吸收热。在低CO_2负载量（<0. 5 mol-CO_2/mol-Am）下，40 ℃时CO_2在5wt%NH_3（aq）溶液中的吸收热为74.8kJ/molCO_2，80 ℃时为65.9kJ/molCO_2。在40°C和60°C时，在低CO2负载区间（<0. 5 mol-CO2/mol-Am），CO2在0.86molPZ溶液中的吸收热为73 kJ/molCO 2，在高CO2负载区间（>0. 5 mol-CO2/mol-Am），吸收热逐渐降低。CO_2在3.1molNH_3 + 0.86molPZ溶液中的吸收热与CO_2在3.1molNH_3（aq）溶液中的吸收热具有高度的一致性，表明少量PZ的掺入对吸收热没有显著影响。本文还对CO2在混合物中的吸收机理进行了深入的探讨。
A reaction calorimeter CPA-122 was used to determine the heats of absorption of CO2in 5wt% NH3(aq), 0.86mol PZ and the blended solutions (1.5–3.1mol) NH3/(0.43–0.86mol) PZ at 40°C, 60°C and 80°C. The heat of absorption of CO2in 5wt% NH3(aq) at low CO2loadings (<0.5mol-CO2/mol-Am) was measured to be 74.8kJ/mol CO2at 40°C and 65.9kJ/mol CO2at 80°C, and found to decrease gradually in the high loading interval (>0.5mol-CO2/mol-Am). The heat of absorption of CO2in 0.86mol PZ solution was measured to be 73kJ/mol CO2in the low CO2loading interval (<0.5mol-CO2/mol-Am), and found to decrease gradually in the high loading interval (>0.5mol-CO2/mol-Am) at 40°C and 60°C. The heat of absorption of CO2in 3.1mol NH3+0.86mol PZ solution demonstrated a high degree of consistency with that of CO2in 3.1mol NH3(aq), which indicated that blending a small amount of PZ does not have a significant effect on the heat of absorption. The mechanism of the absorption process of CO2in the mixtures is also discussed in depth in this paper.