氧化吸收硫化氢回收硫和氢的影响因素

EFFECTIVE FACTORS ON OXIDO ABSORPTION OF HYDROGEN SULFIDE AND RECOVERY OF HYDROGEN AND SULFUR

研究了以氯化铁水溶液处理低硫化氢含量的废气，并用间接电解法回收其中的单质硫和氢气。用氯化铁水溶液处理硫化氢的过程包括三氯化铁水溶液氧化吸收硫化氢和吸收液电解再生制氢两部分。在实验研究的基础上综合评价了Ｈ＋浓度、Ｃｌ－浓度对硫化氢吸收率的影响和盐酸浓度对分解电压的影响。在电解制氢过程中，盐酸浓度降低到０．０１ｍｏｌ／Ｌ时分解电压只有１Ｖ左右，仍远低于电解水制氢的分解电压。

The indirect electrolysis method using FeCl 3 aqueous solution to treat waste gas containing low concentration H 2S has been studied with S and H 2 as the products. The H 2S recovery system consists of two processes: oxido absorbing H 2S from waste gas by FeCl 3 aqueous solution, and electrolyzing the absorbing solution to produce H 2. Based on the experimental data, the influences of H + and Cl - concentrations on the absorptivity of H 2S, and the influences of HCl concentration on the decomposition voltage have been discussed. In the process of electrolysis, the decomposition voltage of the absorption solution will be only about 1 V, much lower than that of water when the concentration of HCl is reduced to 0.01 mol/L. The cycling of using FeCl 3 aqueous solution to absorb H 2S and recover S, and then reproduce H 2 by electrolyzing the solution has been proved to be feasible.