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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~-=2S~(2-)+S_2O_3~(2-)+3H_2O。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。
This work will be phase transfer catalytic (PTC) elemental sulfur disproportionation reaction, greatly reducing the reaction temperature and improve the reaction rate. The reaction proved to be the same as the disproportionation of molten sulfur in aqueous solution, namely 4S + 6OH ~ - = 2S ~ (2 -) + S_2O_3 ~ (2 -) + 3H_2O. The effects of four kinds of phase transfer catalysts of tetraethylammonium, tetrabutylammonium, cetyltrimethylammonium and trioctylmethylammonium, and tetrachlorethylene, xylene and tetrachloroethane were compared. The evidence of the phase transfer catalysis of this system was discussed. It provides the basis for improving the extraction metallurgical process based on elemental sulfur disproportionation reaction.