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頁籤選單縮合
題名 | A Kinetic Study on the Formation of Hexamine in Aqueous Solution=四銨基六甲圜液相生成反應動力學之研究 |
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作者 | 張奉文; 袁良彥; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷期 | 17:1 1986.01[民75.01] |
頁次 | 頁49-57 |
分類號 | 461 |
關鍵詞 | 反應; 四銨基六甲圜; 生成; 動力學; 液相; |
語文 | 英文(English) |
中文摘要 | 四銨基六甲圜為一應用極廣的化學品。本研究主要是探討影響四銨基六甲圜液相生成之反應條件(如銨鹽種類、莫耳數比、反應初濃度、pH值和溫度等)並探討其反應動力學。由實驗結果顯示,以氨水為銨離子來源,在莫耳數比3:2.5(氨過量),甲醛初濃度0.185M,pH=11下反應,對生成物最有利。不同銨鹽在相同pH值下反應,其結果也不相同。我們也發現,在溫度10-50℃下反應,甲醛初濃度由0.0532M昇至0.185M時。反應活化能由6.975 kcal/mol降低為6.335 kcal/mol反應次數對氨水濃度仍為一次,而對甲醛濃度則由二次變為三次。反應速率式分別為: -r□=5.034×10^6 exp (□) C□ mole HCHO/l.min 及 -r□=70147×10^8 exp (□) C□ mole HCHO/l.min 由於初濃度之提高,增加了甲醛的轉化率,使反應較易進行,顯示四銨基六甲圜液相生成反應是一個與反應初濃度有關的複雜反應。 |
英文摘要 | In this study experiments were performed to investigate the reaction conditions (ammonium source, molar ratio, initial concentration, pH value and temperature) affecting the formation of hexamine in the liquid phase. The reaction kinetics on the formation of hexamine were also studied. The results show that the maximum yield of hexamine will be obtained if we use ammonia water as the ammonium source at molar ratio 3:2.5 (ammonia excess), formaldehyde initial concentration 0.185M and pH=11. It is found that different ammonium salts lead to unequal yield of product even at the same pH value. When the formaldehyde initial concentration is raised from 0.0532M to 0.185M, the activation energy decreased from 6.975 kcal/mol to 6.335 kcal/mol; reaction order with respect to ammonia water concentration is still first order, but the order of formaldehyde concentration changes from 2nd to 3rd. The reaction rate equation -r□=5.034×10^6 exp (□) C□ mole HCHO/l.min and -r□=70147×10^8 exp (□) C□ mole HCHO/l.min respectively, Because this reaction is easier to proceed with higher initial concentration, it can be concluded that liquid phase formation of hexamine is a complex reaction with respect to initial concentrations of reactants. |
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