用镍系非晶态合金脱除苯中硫的研究

Removal of Sulfur from Benzene Using Nickel Based Amorphous Alloy as Sorbent

应用程序升温吸附脱附法对噻吩在镍系非晶态合金上的吸附和脱附研究表明 ,常温下 ,噻吩在非晶态合金表面发生物理吸附和化学吸附。物理吸附的噻吩可以脱附 ,而化学吸附的噻吩在非晶态合金表面被活化 ,发生氢解反应 ,C—S键断裂 ,硫留在镍系非晶态合金上 ,释放出烃类。对以镍系非晶态合金为吸附剂的磁稳定床中对苯脱硫过程进行了研究 ,研究了各种操作参数对脱硫效果的影响。实验结果表明 ,在磁稳定床中采用吸附脱硫 ,可使苯中硫的质量分数从 2 μg/g降至 0 0 2 μg/g以下。

TPD was used to investigate adsorption and desorption of thiophene on nickel based amorphous alloy.At room temperature,thiophene was adsorbed on su rface of nickel based amorphous alloy both by physisorption and chemisorption.P hysisorbed thiophene can be desorbed from the alloy surface with increasing temp erature.On hydrogenolysis of the chemisorbed thiophene,the carbon-sulfur bond s cleaved,and a free radical formed.Hydrogen on the sorbent surface then combin ed with the radical to form corresponding hydrocarbon with a sulfur atom remaini ng on the surface of the amorphous alloy.A magnetic stabilization bed (MSB) wi th nickel based amorphous alloy (SRNA-4) as sorbent was used to remove sulfur f r om benzene.Effects of various operating conditions on desulfurization were inve stigated.Sulfur in benzene could be removed from 2 μg/g to less than 0 02 μg /g by MSB desulfurization process.