| 相转移催化元素硫的歧化反应 |
| PHASE TRANSFER CATALYSIS OF DISPROPORTIONATION OF ELEMENTAL SULFUR |
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| 摘要: 本工作将相转移催化(PTC)应用于元素硫歧化反应,大大降低了反应温度,提高了反应速度.该反应被证实与熔态硫在水溶液中的歧化相同,即4S+6OH-=2S2-+S2O32-+3H2O.比较了四乙基铵、四丁基铵、十六烷基三甲基铵和三辛基甲基铵四种相转移催化剂及四氯乙烯、二甲苯和四氯乙烷三种溶剂的影响.讨论了本体系相转移催化的证据.为改进以元素硫歧化反应为基础的提取冶金过程提供了依据. |
| 关键词: 相转移催化 元素硫 岐化季铵盐 |
| 基金项目: |
| Abstract: An original attempt was made to introduce phase transfer catalysis(PTC)into inorganic reaction system. A unique system was proposed to accelerate the disproportionation of elemental sulfur which is the basis of several extractive metallurgical processes and can be carried out only above the melting point of sulfur. Quaternary ammonium hydroxide was chosen as the catalyst for the reaction between hydroxide ions in aqueous phase and elemental sulur in organic phase. The reaction then can be carried out at low temperature as 40℃and was found to be the same as that between melted sulfur and hydroxide ions in aqueous solution. The catalytic effectiveness of different quaternary ammonium hydroxides was compared. Te-trachloroethylene and xylene were found to be effective solvents for the reaction studied. Experimental results, including the results of catalysis by dis-cyclohexano-18-crown-6, showed the reaction studied is phase transfer catalyzed and, not by micella catalysis. |
| Keywords: phase transfer catalysis elemental sulfur disproportionation quaternary ammonium hydroxide |
| 投稿时间：1986-03-23 |
| 摘要点击次数: 1660 |
| 全文下载次数: 2317 |
| 邓彤,陈家镛.相转移催化元素硫的歧化反应[J].无机化学学报,1987,3(4):128-131. |
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