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首页> 外文期刊>Chemical engineering journal >Experimental studies on 3A and 4A zeolite molecular sieves regeneration in TSA process: Aliphatic alcohols dewatering-water desorption
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Experimental studies on 3A and 4A zeolite molecular sieves regeneration in TSA process: Aliphatic alcohols dewatering-water desorption

机译：TSA过程中3A和4A沸石分子筛再生的实验研究：脂肪醇脱水-水脱附

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摘要

The objective of this work are in-depth experimental studies of the thermal regeneration of the zeolite molecular sieves 3A and 4A used to dewatering of aliphatic alcohols: ethanol, n-propanol and n-butanol. The experimental results of water desorption during regeneration stage of temperature swing adsorption (TSA) process, following the dewatering stage of alcohols on adsorbent fixed bed contained in column are presented. Multitemperature Langmuir-Freundlich and dual-site Langmuir-Langmuir equilibrium models were used to correlate experimental equilibrium data of water adsorption from gas phase on 3A zeolite at temperatures 100-250°C The thermal stability, water adsorption capacity, adsorption selectivity and thermal desorption efficiency of zeolites were studied using DTA-TGA, XRD, IR and UV-Vis-NIR methods. DTA-TGA investigations, carried out in the range of temperature 20-1000°C revealed that water removing from 3A zeolite molecular sieve takes place up to 400 °C and from 4A up to 500 °C. However, in temperatures higher than 240 °C (3A zeolite) and 230 °C (4A zeolite) decrease of the water desorption rate was observed. Investigated zeolites reveal structural stability up to at least 500 °C, and heating above this temperature lead to an irreversible collapse of structure and a loss of adsorptive capacity. The influence of the inlet purge air temperature (200-250 °C), and air mass flux density (0.170-0.306 kg/m~2s) on the zeolite dynamic water adsorption capacity, desorption and cooling steps duration, were studied. The lowest purge air and energy consumption were measured for regeneration temperature of 250 °C. Dynamic adsorption equals to 65% of the equilibrium adsorption capacity.
机译：这项工作的目的是对用于脱水脂肪醇（乙醇，正丙醇和正丁醇）的分子筛3A和4A进行热再生的深入实验研究。给出了变温吸附（TSA）过程再生阶段水脱附的实验结果，该过程是塔中所含吸附剂固定床上的醇脱水阶段之后的结果。使用多温Langmuir-Freundlich和双中心Langmuir-Langmuir平衡模型来关联在100-250°C的温度下3A沸石上气相吸附水的实验平衡数据。热稳定性，吸水能力，吸附选择性和热脱附效率使用DTA-TGA，XRD，IR和UV-Vis-NIR方法研究了沸石的含量。在20-1000°C的温度范围内进行的DTA-TGA研究表明，从3A沸石分子筛中除去水的温度最高为400°C，从4A最高为500°C。但是，在高于240°C（3A沸石）和230°C（4A沸石）的温度下，观察到吸水率降低。所研究的沸石显示出至少在500°C的温度下具有结构稳定性，而加热到该温度以上会导致结构不可逆转地塌陷并失去吸附能力。研究了入口吹扫空气温度（200-250°C）和空气质量通量密度（0.170-0.306 kg / m〜2s）对沸石动态吸水能力，解吸和冷却步骤持续时间的影响。对于250°C的再生温度，测量了最低的吹扫空气和能量消耗。动态吸附等于平衡吸附容量的65％。

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