Hybrid Cycles to Purify Concentrated Feeds Containing a Strongly Adsorbed Impurity with a Nonlinear Isotherm: The PSA−TSA Supercycle
Hybrid Cycles to Purify Concentrated Feeds Containing a Strongly Adsorbed Impurity with a Nonlinear Isotherm: The PSA−TSA Supercycle
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使用非线性等温线净化含有强吸附杂质的浓缩原料的混合循环：PSA−TSA 超级循环
DOI：
10.1021/ie801661w
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发表时间：
2009
影响因子：
4.2
通讯作者：
P. Wankat
中科院分区：
文献类型：
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作者：
P. Sharma;P. Wankat
开发了一种新的吸附过程，用于从非吸附或弱吸附气体中去除具有非常非线性等温线的强吸附气体杂质。这个过程是一系列低吹扫比的变压循环，然后是热再生，被称为PSA-TSA超级循环，因为它由PSA循环顶部的热循环组成。PSA循环本身不会达到循环稳态，尽管超循环确实达到循环稳态。由于水具有强非线性吸附特性，以13 X分子筛为模型体系，研究了水/氮混合物对13 X分子筛的吸附行为。在低进料浓度（1000 ppm水）下，PSA工作良好，是首选方法。在中等进料浓度（4000 ppm水）下，TSA是首选方法。PSA-TSA超级循环在处理进料中的高溶质浓度（40 000 ppm水）和生产高纯度产品（1 ppm水）方面优于PSA和TSA。PSA不能满足该纯度，并且TSA具有低生产率。新的hy…
A new adsorption process is developed to remove a strongly adsorbing gaseous impurity that has a very nonlinear isotherm from a non- or weakly adsorbing gas. This process, a number of pressure-swing cycles with low purge ratios followed by thermal regeneration, is called a PSA−TSA supercycle because it consists of thermal cycles on top of PSA cycles. The PSA cycles never reach cyclic steady state by themselves, although the supercycle does reach cyclic steady state. A water/nitrogen mixture with zeolite 13X is taken as model system because water exhibits strongly nonlinear adsorption characteristics. At low feed concentrations (1000 ppm water), PSA works well and is the preferred method. At intermediate feed concentrations (4000 ppm water), TSA is the preferred method. The PSA−TSA supercycle is better than PSA and TSA in handling high solute concentrations in the feed (40 000 ppm water) and producing high-purity product (1 ppm water). PSA fails to meet this purity, and TSA has low productivity. The new hy...