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首页> 外文会议>AIChE Annual Meeting >“Effective Diffusion Coefficient of Isobutane,2,3 dimethyl-Butane and hexyl-cyclo-hexane in Ternary Blends of Adsorbates (liquid phase) in Spent-regenerated alkylation Catalysts
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“Effective Diffusion Coefficient of Isobutane,2,3 dimethyl-Butane and hexyl-cyclo-hexane in Ternary Blends of Adsorbates (liquid phase) in Spent-regenerated alkylation Catalysts

机译：“在废弃的烷基化催化剂中的沙脂盐（液相）中的三元共混物中的异丁烷，2,3二甲基 - 丁烷和己基环 - 环己烷的有效扩散系数

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摘要

Diffusion and adsorption of isobutene,hexane,dimethyl-butane,dimethyl-pentane,hexyl-cyclohexane and pyridine in liquid phase were studied in presence of hydrogen at 1.4 MPa.Rate of diffusion of binary and ternary blends were studied in liquid phase at different temperature and coke content on PtSOxZrTi/SiO2 and CeNaX catalysts.Coke was built up during isobutane alkylation in presence of hydrogen in a pilot plant.Heat of adsorption were experimentally measured and predicted by DFT simulation.Modified Peng-Robinson EOS equations were used to determine the excess of volume of the liquid phase,hydrogen solubility and hydrocarbon vaporization at different temperatures.Catalysts were characterized by nitrogen adsorption,FTIR and ~(13)CNMR analyses.The results show that difference in the rate of counter-diffusion resides in the pore structure and the presence of acid sites on these solids.Interactions sorbents-adsorbates and sorbent-sorbents occurred in solution and on surface that modified the effective diffusivity.Main adsorption and desorption occurred in mesopores.Micropores are blocked by the presence of strong adsorbed hydrocarbons and coke that restrain the diffusion out of pores.Coke and adsorption at the intersections made micropores inaccessible for further alkylation reactions.
机译：在1.4MPa的情况下在氢相情况下研究异丁烯，己烷，二甲基 - 丁烷，二甲基戊烷，己烷，二甲基 - 丁烷，二甲基戊烷，己基环己烷和吡啶，在不同温度下在液相中研究二元和三元共混物的扩散在PtsoxzRTI / SiO 2和Cenax催化剂上的焦炭含量在异丁烷烷基化期间在飞行员中的氢气存在下建立。通过DFT仿真进行了实验测量和预测吸附的。在不同温度下的液相，氢溶解度和烃蒸发的过量量。催化剂的特征在于氮吸附，FTIR和〜（13）CNMR分析。结果表明，反扩散速率差异在孔隙结构中存在差异在这些固体上存在酸部位。互动吸附剂 - 吸附剂和吸附剂在溶液中和改性T的表面发生他有效的扩散性。中孔中发生的吸附和解吸方法。通过强烈的吸附烃和焦炭抑制孔隙扩散的焦炭来阻止堵塞的焦化。交叉点的吸附使微孔无法进一步烷基化反应。

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