石蜡油中杂质结构中红外光谱研究

Study on Impurity Structure in Paraffin Oil by Mid infrared Spectroscopy

采用中红外(MIR)光谱技术开展了石蜡油及其杂质的结构研究。实验发现:石蜡油结构红外吸收模式主要包括:CH_(3)基团不对称伸缩振动模式(ν_(asCH_(3)-石蜡油))、CH_(3)基团对称伸缩振动模式(ν_(sCH_(3)-石蜡油))、CH_(2)基团不对称伸缩振动模式(ν_(asCH_(2)-石蜡油))、CH_(2)基团对称伸缩振动模式(ν_(sCH_(2)-石蜡油))、CH_(2)基团弯曲振动模式(δ_(CH_(2)-石蜡油))、CH_(3)基团不对称弯曲振动模式(δ_(asCH_(3)-石蜡油))、CH_(3)基团对称弯曲振动模式(δ_(sCH_(3)-石蜡油))、CH_(2)基团面内摇摆振动模式(ρ_(CH_(2)-石蜡油))。石蜡油中杂质结构红外吸收模式主要包括:水分子伸缩振动模式(ν_(H_(2)O-杂质-水))、芳基基团C-H伸缩振动模式(ν_(C-H-杂质-芳基))、羰基基团C=O伸缩振动模式(ν_(C=O-杂质-羰基))、水分子弯曲振动模式(δ_(H_(2)O-杂质-水))、芳基基团C=C伸缩振动模式(ν_(C=C-杂质-芳基))、酰胺基团第Ⅰ特征红外吸收谱带(ν_(amideⅠ-杂质-酰胺))和酰胺基团第Ⅱ特征红外吸收谱带(ν_(amideⅡ-杂质-酰胺))。石蜡油杂质结构主要包括:芳基化合物、羰基化合物、酰胺化合物及水。MIR光谱初步开展了石蜡油及其杂质结构定性研究,具有重要的应用研究价值。

The structure of paraffin oil and its impurities was studied using mid infrared(MIR)spectroscopy technology.The experiment found that the infrared absorption mode of paraffin oil structure mainly includes:CH_(3)group asymmetric stretching vibration mode(ν_(asCH_(3)-paraffin oil)),CH_(3)group symmetric stretching vibration mode(ν_(sCH_(3)-paraffin oil)),CH_(2)group asymmetric stretching vibration mode(ν_(asCH_(2)-paraffin oil)),CH_(2)group symmetric stretching vibration mode((ν_(sCH_(2)-paraffin oil)),CH_(2)group bending vibration mode(δ_(CH_(2)-paraffin oil)),CH_(3)groups asymmetric bending vibration mode(δ_(sCH_(3)-paraffin oil)),CH_(3)groups symmetric bending vibration mode(δ_(sCH_(3)-paraffin oil))and CH_(2)group in-plane rocking vibration mode(ρ_(CH_(2)-paraffin oil)).The infrared absorption mode of impurity structure in paraffin oil mainly includes water molecule stretching vibration mode(ν_(H_(2)O-impurity-water)),aryl group C-H stretching vibration mode(ν_(C-H-impurity-aryl group)),carbonyl group C=O stretching vibration mode(ν_(C=O-impurity-carbonyl group)),water molecule bending vibration mode(δ_(H_(2)O-impurity-water)),aryl group C=C stretching vibration mode(ν_(C=C-impurity-aryl group)),the first characteristic infrared absorption band of amide group(ν_(amideⅠ-impurity-amide))and the second characteristic infrared absorption band of amide group(ν_(amideⅡ-impurity-amide)).The impurity structures of paraffin oil mainly include aryl group chemical compound,carbonyl group chemical compound,amide group chemical compound and water.The MIR spectroscopy has preliminarily conducted qualitative research on the structure of paraffin oil and its impurities,which has important application research value.