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减压渣油中的硫主要是硫醚硫和噻吩硫,但因渣抽结构组成复杂.很难直接定量.若用选择性氧化剂将减压渣油中的硫醚硫选择性氧化成相应亚砜.借助亚砜S= O键在 1030 cm-1附近的强红外振动吸收,就可用红外光谱仪测定亚砜.从而得到相应硫醚硫含量.以KIO3为选择性氧化剂.以已知硫醚硫含量的胜利减压渣油为标样(ωs=0.47% ),选择性氧化后,测定其在 1030 cm-1处的峰面积A(?),依据Lambert- Beer定律.求出渣油亚砜的红外吸收系数K(13.3 L·g-1).然后测定其它油样选择性氧化后在 1030 cm-1处的峰面积,求出亚砜硫浓度后进而求出相应硫醚硫的含量.测定结果与电化学方法所得结果一致.
The sulfur in vacuum residue is mainly thioether thiophene and thiophene sulfur, but due to the complexity of slag pumping structure, it is difficult to quantify directly.If sulfur dioxide in vacuum residue is selectively oxidized to the corresponding sub Sulfone.Under the strong infrared vibration absorption near 1030 cm-1 with the S = O bond of sulfoxide, the sulfoxide can be measured by infrared spectroscopy to get the sulfur content of the thioether.With KIO3 as the selective oxidant, (Vs = 0.47%). After the selective oxidation, the peak area A (?) At 1030 cm-1 was determined and the residual sulfoxide content was calculated according to the Lambert-Beer law (13.3 L · g-1) .The peak area at 1030 cm-1 after selective oxidation of other oil samples was determined, and the sulfur sulfoxide concentration was calculated to determine the sulfur content of thioether. The results are consistent with those obtained by electrochemical method.