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題 名 | 甲醇在固體酸(鹼)觸媒上脫水成甲醚之動力學研究 |
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作 者 | 林有銘; 王奕凱; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷 期 | 12:4 1981.12[民70.12] |
頁 次 | 頁173-182 |
關鍵詞 | 甲醇; 甲醚; 固體; 動力學; 脫水; 酸鹼; 觸媒; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究使用外部廻流(external recycle)微反應器(microreactor)以γ-氧化鋁及ZSM-5兩個固體酸(鹼)(solid acid-base)為觸媒,在低濃度與高轉化率的反應下。來推導甲醇脫水成甲醚之動力模式。根據實驗數據,吾人認為,甲醇是以分解的型態吸附於一對酸-鹼活性中心(a pair of acid-base sites)上,且其吸附速率為全反應之決定速率。反應的活化能,以γ-氧化鋁為觸媒時是22.8 Kcal/gmol;而以ZSM-5為觸媒時僅為12.2 Kcal/gmol。甲醇的吸附熱則分別為10.8及22.3 Kcal/gmol。在同樣的進料條件下,達到80%轉化率所需的溫度,γ-氧化鋁要比ZSM-5高出120℃。 最後利用由廻流微反應器所獲得之速率方程式估計高濃度進料時的轉化率,並與以液體為進料的固定床(fixed bed)反應器所測得的數據相比較,獲得相當吻合的結果。 |
英文摘要 | This work considers the kinetics of dehydration of methanol to dimethylether over γ-alumina and ZSM-5. Experiments were carried out under low concentration of feed and high conversion of effluent in a external recycle microreactor. The experimental data suggests that the methanol is adsorbed with dissociation on a pair of acid-base sites and this adsorption step is the rate-determine-step of the overall reaction. The activation energy of the reaction is 22.8 Kcal/gmol with γ-alumina, whereas that is merely 12.2 Kcal/gmol with ZSM-5. The heat of adsorption of methanol with dissociation are 10.8 and 22.3 Kcal/gmol over γ-alumina and ZSM-5 respectively. Under the same feed conditions, temperature reaching 80% conversion over γ-alumina was 120℃ higher than that over ZSM-5. In addition, we extented our kinetic model to calculate the conversions at much higher feed concentrations. The predicted conversions agreed the experimental results from a fixed bed reactor very well. |
本系統中英文摘要資訊取自各篇刊載內容。