Adsorptive Water Removal from Primary Alcohols and Acetic Acid Esters in the ppm-Region
Adsorptive Water Removal from Primary Alcohols and Acetic Acid Esters in the ppm-Region
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ppm 范围内伯醇和醋酸酯的吸附水去除
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
D. Bathen
中科院分区：
文献类型：
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作者：
C. Pahl;C. Pasel;M. Luckas;D. Bathen
干燥有机溶剂对许多工业部门都很重要。吸附除水是一种获得高纯度溶剂的技术。然而，对影响吸附行为的参数的深入了解仍然是零碎的。本文系统地研究了不同链长的醇（C1 - C6）和乙酸酯（乙酸甲酯-乙酸正丁酯）对水的吸附。采用3A和4A型沸石作为吸附剂。分析了粒径排除对吸附性能的影响。沸石3A对大临界分子直径溶剂的吸附等温线与文献数据预测的水蒸气等温线相似。对于较小的溶剂分子（甲醇、乙醇、1-丙醇），3A沸石的吸水能力明显较低。在所有溶剂的情况下4A沸石上的水吸附小于水蒸气吸附，即使估计的分子直径大于报道的窗口a。
Dry organic solvents are important for many industrial sectors. Adsorptive water removal is one technique to obtain highly pure solvents. However, in-depth knowledge of the parameters influencing adsorption behavior is still fragmentary. This paper presents a systematic investigation of water adsorption from alcohols (C1 to C6) and acetic acid esters (methyl acetate to n-butyl acetate) of different chain lengths. Zeolites of types 3A and 4A are used as adsorbents. The impact of size exclusion on adsorption properties is analyzed. The water adsorption isotherms on zeolite 3A from solvents with a large critical molecular diameter are similar to the water vapor isotherm as expected from literature data. In case of smaller solvent molecules (methanol, ethanol, 1-propanol) a significantly lower water adsorption capacity is found on zeolite 3A. In case of all solvents on zeolite 4A water adsorption is lower than water vapor adsorption even if the estimated molecular diameter is larger than the reported window a...