Ammonia absorption at haber process conditions
Ammonia absorption at haber process conditions
复制标题
哈伯工艺条件下的氨吸收
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
E. Cussler
中科院分区：
文献类型：
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作者：
Mark S. Huberty;Andrew Wagner;A. Mccormick;E. Cussler
在170-430°C的温度范围内，氨吸收到氯化镁中的动力学测量为氨压力变化。实际压力减去平衡时的压力会迅速下降，半衰期不到一分钟。它随时间的平方根而变化，表明扩散限制吸收。从这些数据推断出氨在固体氯化镁中的扩散系数约为10−11-10−13 cm 2/s，比许多固相扩散系数快得多。虽然光学显微镜和BET表面积实验表明在氨合成温度下吸收剂的重结晶和团聚，但吸收速率仍然很高。吸收速率对温度，粒度和二氧化硅支持的存在下的依赖性也进行了研究。结果表明，改进氨分离和方法，以开发高转化率，小规模，多功能氨合成反应器。© 2012美国化学工程师学会AIChE J，2012
The kinetics of ammonia absorption into magnesium chloride is measured as ammonia pressure change in the temperature range 170-430°C. The actual pressure minus that at equilibrium drops quickly, with a half life of less than a minute. It varies with the square-root of time, suggesting diffusion limited absorption. The diffusion coefficient of ammonia in solid magnesium chloride inferred from these data is on the order 10−11-10−13 cm2/s, considerably faster than many solid-phase diffusivities. While optical microscopy and BET surface area experiments indicate recrystallization and agglomeration of the absorbent at ammonia synthesis temperatures, the absorption rate remains high. The dependence of absorption rate on temperature, particle size and the presence of a silica support is also investigated. The results suggest both improved ammonia separation and ways to develop high-conversion, small-scale, multifunctional ammonia synthesis reactors. © 2012 American Institute of Chemical Engineers AIChE J, 2012