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首页> 外文期刊>Separation and Purification Technology >Adsorption and thermal regeneration of acetone and toluene vapors in dealuminated Y-zeolite bed
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Adsorption and thermal regeneration of acetone and toluene vapors in dealuminated Y-zeolite bed

机译：脱铝Y型沸石床中丙酮和甲苯蒸气的吸附和热再生

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摘要

Adsorption and thermal regeneration dynamics of acetone and toluene on dealuminated Y-zeolite (DAY-zeolite) were studied experimentally and theoretically. The isotherms of acetone on DAY-zeolite changed from Type-II to Type-HI with an increase in temperature, whereas the isotherms of toluene were Type-I. The adsorption amount of acetone was higher than that of toluene at low temperatures, but its adsorption affinity was weaker. Due to the differences in isotherm shape, acetone and toluene showed different adsorption and desorption dynamic behaviors. The breakthrough point of acetone was achieved faster than that of toluene, but the saturation time was reached later. On the other hand, in the regeneration step via a hot nitrogen purge, acetone could be obtained more quickly and at higher concentration from the DAY-zeolite bed because its isotherm approached Type-Ill with a temperature increase. A non-equilibrium and non-adiabatic model, incorporating a linear driving force model, Langmuir model for toluene and Aranovich-Donohue model for acetone, were used to simulate the dynamic behaviors of concentration and temperature during the adsorption and thermal regeneration steps. The effects of operating variables such as purge gas velocity, regeneration temperature, and initial bed loading on the regeneration step were studied. Also, the specific energy requirement and purge gas consumption were evaluated to discuss the process efficiency of the DAY-zeolite bed.
机译：通过实验和理论研究了丙酮和甲苯在脱铝Y-沸石（DAY-沸石）上的吸附和热再生动力学。随着温度的升高，DAY沸石上的丙酮等温线从II型转变为HI型，而甲苯的等温线为I型。低温下丙酮的吸附量高于甲苯，但吸附亲和力较弱。由于等温线形状的差异，丙酮和甲苯表现出不同的吸附和解吸动力学行为。丙酮的突破点要快于甲苯，但达到饱和时间要晚一些。另一方面，在通过热氮气吹扫的再生步骤中，由于DAYD沸石床的等温线随温度升高而接近III型，因此可以更快，更高浓度地从DAY沸石床中获得丙酮。使用线性驱动力模型，甲苯的Langmuir模型和丙酮的Aranovich-Donohue模型的非平衡非绝热模型来模拟吸附和热再生步骤中浓度和温度的动态行为。研究了吹扫气速度，再生温度和初始床载等操作变量对再生步骤的影响。此外，还对比能量需求和吹扫气体消耗进行了评估，以讨论DAY沸石床的工艺效率。

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