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直接电解硫化氢碱性溶液(通常用Na2S溶液表示)产生单质硫和氢气的关键问题是单质硫在阳极表面上沉积而导致的阳极钝化.用硫化氢气体分解Na2S的阳极电解液可以很好地解决这一问题,并对这一方法进行了热力学分析.对简化S H2O系的电势 pH图的分析表明,多硫化物Sx2-在碱性溶液中稳定,且随着体系中溶解态物质的总硫浓度T(s)的增加,高级多硫化物的优势区增大.当Na2S阳极电解液与硫化氢气体反应时,固相硫稳定存在于pH较低和H2S分压较小的环境中.分析表明,当H2S分压为1atm,溶液pH值小于8时,大多数多硫化物分解为单质硫S、S2-,HS-或H2S(aq.).分析结果对电解产生多硫化物以及用H2S气体分解多硫化物的实际过程具有重要指导意义.图6,表1,参10.
A key issue with direct electrolysis of hydrogen sulfide alkaline solutions (usually expressed as Na2S solutions) to produce elemental sulfur and hydrogen is anodic passivation caused by the deposition of elemental sulfur on the anode surface Anode electrolyte that decomposes Na2S with hydrogen sulfide gas can be very good This problem was solved and the thermodynamic analysis of this method was carried out.Analysis of the potential pH diagram of a simplified S H2O system showed that polysulfide Sx2- was stable in alkaline solution and with the increase of dissolved When the total sulfur concentration T (s) increases, the dominant region of the advanced polysulfides increases.When the Na2S anolyte reacts with hydrogen sulfide gas, the solid-phase sulfur is stable in the environment with lower pH and smaller H2S partial pressure The analysis shows that most polysulfides decompose to elemental sulfur S, S2-, HS- or H2S (aq.) When the partial pressure of H2S is 1 atm and the solution pH is less than 8. The analysis results show that the polysulfides produced by electrolysis and The actual process of decomposing polysulfide with H2S gas is of great guiding significance.Figure 6, Table 1, Reference 10.