高温高圧水中でのベンゼンからフェノールの直接合成

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Direct conversion of benzene to phenol in high-temperature and high-pressure water was performed using batch-type and continuous flow-type reactor. Batch-type experiments were carried out at temperature 400℃ and pressures of 10 to 40 MPa. The amounts of benzene ranged from 0.1 to 0.6 g, and EbCte / benzene ratio ranged from 1/8 to 1. The identification and quantification of liquid products were conducted by GC/MS and GC/FID with internal standard method. Gas product distribution was determined by GC/TCD. As a result of qualitative analysis phenol and biphenyl were mainly observed. At higher pressure condition, increasing phenol selectivity indicates the phenol production might be dominated by ionic reaction mechanism. Phenol selectivity increased with higher pressure and shorter reaction time. Benzene conversion increased with longer reaction time, however the phenol selectivity decreased. This phenomenon was considered that produced phenol was decomposed to the gas products such as carbon monoxide or carbon dioxide. To avoid phenol decomposition, flow-type experiments were operated at pressure 40 MPa, temperatures 100 to 400℃ and residence time 2.4 to 95.7 s. According to quantitative analysis, carbon balance generally exceeded around 85 %. Regarding the gas analysis, carbon monoxide and carbon dioxide were mainly observed. But the amounts of the gas product had a minor contribution on the mass balances. Phenol formation increased between 250 to 300℃, the maximum phenol yield was obtained 5.14 % at 40 MPa, 250℃ and residence time 44.5 s. Because of similar temperature dependence between phenol yield and ionic product, we confirmed that phenol synthesis was ionic reaction.
八戸工業高等専門学校の論文

高温高圧水中でのベンゼンからフェノールの直接合成

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