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題名 | Homogeneous Reaction of Carbon Disulfide and o-Phenylene Diamine in the Presence of Potassium Hydroxide=在氫氧化鉀存在下之二硫化碳和鄰-苯烯二胺均相反應 |
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作者姓名(中文) | 王茂齡; 劉炳郎; | 書刊名 | 中國工程學刊 |
卷期 | 20:4 1997.07[民86.07] |
頁次 | 頁413-422 |
分類號 | 460.02 |
關鍵詞 | 合成2-硫醇基苯駢咪唑; 氫氧化鉀效應; 反應機構; Synthesis of mercaptobenzimidazole; MBI; Effect of KOH; Reaction mechanism; |
語文 | 英文(English) |
中文摘要 | 本研究有關在氫氧化鉀存在下,進行二硫化碳和鄰-苯烯二胺之三級胺之催化反 應。氫氧化胛在反應中所扮演之角色可藉由一些獨立之實驗而獲證,這些實驗包括利用二硫 化碳和氫氧化鉀進行反應一段時間後,再與鄰-苯烯二胺繼續反應。由實驗所獲得數據得知, 考慮二硫化碳和鄰-苯烯二胺之三級胺催化反應之動力學模式乃藉此建立,其反應機構乃倡導 二硫化碳和三級胺首先反應形成一個活性中間產物(CS2-R3N),此活性中間產物再與鄰-苯烯二 胺合成2-硫醇基苯駢咪唑(2-Mercaptobenzimidazole,MBI)產生,藉著添加三級胺和氫氧化 鉀,反應速率皆大大的提昇,但是使用非常大量之氫氧化鉀並不對提昇反應速率有任何之幫 助。因此,在探討氫氧化鉀對反應之影響時,吾人可獲得氫氧化鉀之最佳值,同時,我們也對 氫氧化鉀影響反應物轉化率做出一合理解釋。 |
英文摘要 | The reaction of carbon disulfide and o-phenylene diamine catalyzed by tertiary amine in the presence of potassium hydroxide is investigated. The role of KOH on the reaction is tested by conducting several independent experiments that included reaction of carbon disulfide and potassium hydroxide for a period, and further reaction of o-phenylene diamine in various sequential orders. Based on experimental data, a kinetic model that take into account the reaction of carbon disulfide and o-phenylene diamine in the presence of KOH catalyzed by tertiary amines is proposed. A reaction mechanism is proposed in which carbon disulfide and tertiary amine first reacted to produce the active intermediate CS2-R3N. This intermediate further reacts with o-phenylene diamine to produce mercaptobenzimidazole (MBI). The reaction is greatly accelerated in the presence of both tertiary amine and potassium hydroxide, but this enhancement in the reaction of carbon disulfide and o-phenylene diamine with tertiary amine exceeded that with potassium hydroxide. An optimum amount of KOH is obtained in the reaction. Satisfactory explanation accounts for the effect of KOH on the conversion. |
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