钼硅酸化学吸收脱除H_2S气体回收硫磺的研究

REMOVAL OF H2S AND RECOVERY OF SULFUR FROM GAS STREMS BY CHEMICAL ABSORPTION USING 12-MOLYBDOSILICIC ACID SOLUTION

首次报道了杂多酸溶液化学吸收从气流中脱除Ｈ２Ｓ制硫磺之新工艺。实验结果表明，气流中Ｈ２Ｓ脱除效率与溶液酸度、杂多酸浓度、Ｈ２Ｓ含量以及温度、停留时间有关。吸收的最佳酸度为０．１ｍｏｌ／ｄｍ３Ｈ２ＳＯ４，此时Ｈ２Ｓ的脱除率可达９９％以上。对吸收机理进行了研究。通过对比纯硫磺和Ｈ２Ｓ转化物的热分析图谱和化学分析，确证了杂多酸在吸收Ｈ２Ｓ过程中，Ｈ２Ｓ被氧化为硫磺，杂多酸被还原为单电子杂多兰。杂多兰易被Ｃｌ２，ＦｅＣｌ３和ＮＯｘ氧化而再生。

Removal of H2S and recovery of sulfur by chemical absorption into 2-molybdosilicic acid solution was initiated. The experimental results showed that the removal of H2S from gas streams was a function of concentrations of H2S and 12-molybdosilicic acid,acidity of solutions,temperature and contact time of gas and solutions. The optium acidity for H2S absorption was found to be 0. 1 mol/dm3 H2SO4 where the removal of H2S from gas streams can be over 99%.The chemical absorption mechanism was investigated in datail. It was found that the H,S in gas streasm was oxidized into elemental sulfur. More than 95% sulfur produced can be recovered. The 12-molybdosilicic acid (H. SiM12 (Ⅵ)O40) was reduced to H5SiMo11 ( Ⅵ )Mo( Ⅴ )O40 by H2S. The molybdenum blue solution can be regenerated easily by chemical oxidation with NO2, Cl2, and FeCl3.