稻壳热解油的特性

利用自行搭建的固定床热反应器对稻壳进行热解实验制备热解油, 采用两种不同极性的石英毛细柱对收油后的二氯甲烷溶液进行GC-MS检测。实验结果表明:热解终温对热解油品的组分种类几乎无影响, 但热解油产率随热解终温增大呈先升高后降低趋势;热解油二氯甲烷溶液的水相部分化合物种类相对较少, 主要物质为甲酸、乙酸和1-羟基-2-丙酮, 油相部分有机物种类极为复杂, 主要物质为糠醛、糠醇以及酚类和酮类物质;可凝结的热解有机气体主要在500～600℃发生二次裂解;对稻壳600℃热解油油相检测时发现:在RTX-5MS柱检测条件下, 组分中前5种化合物是糠醛、2-丁酮、乙酸、苯酚和2-甲氧基苯酚, 而在RTX-WAX 柱检测条件下, 前5种化合物是苯酚、2-甲氧基苯酚、4-乙基苯酚、乙酸和3-甲基苯酚。

Characteristics of pyrolytic oil generated from rice husk

The pyrolysis experiment of rice husk was conducted in a self-built fix bed heater. Two chromatographic columns, RTX-5MS and RTX-WAX, were used for the collection of mixture of pyrolytic oil and dichloromethane solution, which were later analyzed by GC-MS. Results showed that the compositions of pyrolytic oils at different final temperatures changed little. As the pyrolysis temperature rose, pyrolytic oil yield first increased and then decreased. The water phase of dichloromethane and pyrolytic oil solution contained relatively few compounds, mainly formic acid, acetic acid, and 1-hydroxy-2-propanone, while the oil phase contained complicated compounds, including furfural, furfuryl alcohol, phenols and ketones. The analysis of dichloromethane in oil phase and pyrolytic oil solution at 600℃ showed that through column RTX-5MS analysis, the first five compounds were furfural, 2-butanone, acetic acid, phenol and 2-methoxy phenol, and that through RTX-WAX column analysis, the first five compounds were phenol, 2-methoxy phenol, 4-ethyl phenol, acetic acid and 3-methyl phenol.