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一种氨法脱碳氨水乙醇混合吸收剂结晶动力学特性研究

DOI: 10.13334/j.0258-8013.pcsee.2014.05.009, PP. 770-777

Keywords: 氨水,乙醇,鼓泡反应器,停留时间,结晶动力学

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Abstract:

针对目前氨法脱除二氧化碳研究中存在的问题,该文提出一种低浓度氨水强化结晶低能耗捕集CO2的工艺,采用新型的氨水乙醇混合吸收液,利用半连续鼓泡反应系统考察停留时间对结晶的影响。发现随着停留时间的延长,晶体产物的粒径分布逐渐改善,平均粒径亦在前30?min保持一定增长速率,晶体形貌趋于完整,且结块问题也可以得到一定程度的解决。综合考虑,该实验条件下较适宜的停留时间为30~40?min;同时对结晶动力学进行初步探索,确定了该实验中晶体的生长机制为粒度无关生长,并给出了晶体成核速率与生长速率的生长动力学模型为B0=4.172×106G1.090。为接下来新工艺的进一步研究提供基础数据和参考,并对实际工艺的发展和改善具有借鉴意义。

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