以模式參數法評估輕裂汽油二級氫化觸媒活性之侷限

本研究嘗試以模式參數法評估輕裂汽油二級氫化觸媒活性，受限於產品油的烯類及硫含量都低於1 ppm，及上下媒床功能有別，反應器模式與模擬需作局部性的假設始能計算。結果顯示，在常規進料組成及操作條件下，上媒床加氫飽和反應之吸附－反應（LHHW）模式，因吸附常數與分壓乘積遠大於1，使得估算之速率常數幾乎與進料的反應物濃度成線性相關，且與反應物的碳數或結構無關聯；而ppm級的脫硫反應計算，會遇到程式計算的數值截尾問題，因而無法估算下媒床的脫硫觸媒活性。模式應用時，當非常規進料組成與再生觸媒回用之狀況下，可依速率常數－反應物濃度關聯式、觸媒老化因子等調整模式參數值，而得貼近媒床溫度梯度之預測值。

關鍵字

二級氫化反應；反應器模式；程序模擬

並列摘要

This work is intended to evaluate the second stage hydrogenation catalyst activity via reactor model parameters. Because the content of olefins and sulfur in products should be lower than 1 ppm, and the functions of top and bottom bed catalysts are different, some assumptions are made on reactor modeling in order to perform the simulation on commercial software. The adsorption term in LHHW model is larger than 1.0 such that the estimated rate constants are almost linearly dependent on reactant concentrations. Also, the rate constants are not related to carbon numbers or molecular structures under normal feed and operating conditions. The activity for desulfurization can't be calculated due to that the round-off error during simulation cannot be avoided for ppm grade of products. To simulate the real applications, an aging factor is introduced to adjust the correlated rate constants. The predicted bed temperature profiles are fairly consistent to the operating data of re-use HDS catalysts under abnormal reactant concentration.

並列關鍵字

Second Stage Hydrogenation ； Reactor Model ； Process Simulation

國際替代計量

以模式參數法評估輕裂汽油二級氫化觸媒活性之侷限

全文下載

主題瀏覽