雙模式觸媒於重質油加氫脫金屬製程的應用設計

• Main Author: 許東銘
• Other Authors: 江建利
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/22509818905383050994

碩士 === 國立成功大學 === 化學工程學系 === 88 === In recent years, bimodal catalysts are quite of potential in the applications of residual oil hydrodemetallation (HDM). In these catalysts, mesopores can prolong the catalyst life, while micropores can increase their reaction rates. This study was intended to use bimodal catalysts to explore their simulations and designs in the HDM process. In this study, the mathematical model will be established first, then the effect of the system parameters upon the performance will be investigated. The system parameters include the ratio of mesopore to micropore, the percentage of mesopore, mesopore radius,micropore radius, Thiele Modulus Φ,the residence time of heavy oil in the fixed bed reactor, outlet metal concentration, and upper limiting temperature. The simulations include the temperature-rising profile of the HDM fixed bed reactor and the plugging situations in the mesopore and micropore in the reactor . Also, the optimal design of reactor will be studied, and their results will be further used to explore the arrangement of the two-stage reactor. This study uses an average mesopore radius and an average micropore radius to simulate a bimodal catalyst.The numerical results show that under fixing the volume percentage of mesopore, the larger the value of the ratio of mesopore to micropore, the less mass of metal removal. When the percentage of mesopore increases at a ratio of mesopore to micropore equal to 3, the total mass of demetallation decreases at the beginning but then increases. WhenλS0 is between 0.21 and 0.24, the total mass of demetallation increases as the mesopore radius increases. The larger the value of Φ0 or the less outlet metal concentration, the shorter the life of the catalysts. Besides, the higher value of β0 or raising the upper limiting temperature can increase operating life of the fixed bed reactor. In the arrangement of the two-stage reactor , using a larger percentage of mesopore or pore radius in the upper-stage reactor will have a better performance in demetallation.