Catalyzed Partial Oxidative Gasification of Phenol in Supercritical Water

详细信息    查看全文

• 作者：DongHai Xu ; ShuZhong Wang ; Yang Guo ; XingYing Tang ; YanMeng Gong ; HongHe Ma
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：April 20, 2011
• 年：2011
• 卷：50
• 期：8
• 页码：4301-4307
• 全文大小：929K
• 年卷期：v.50,no.8(April 20, 2011)
• ISSN：1520-5045

文摘

Phenol, a substance difficult to be gasified, is often an intermediate product from biomass gasification in supercritical water. In this study, 1 wt % phenol is gasified in supercritical water with different oxidation coefficients (0 鈮?n 鈮?0.8) at 430鈭?50 掳C, 25 MPa in a continuous tubular-flow reaction plant with or without 0.1 wt % Na₂CO₃. The results show that TOC (total organic carbon) removal rate and COD (chemical oxygen demand) removal rate of reactor effluent will rise with the increase of oxidation coefficient and reaction temperature. When n rises from 0.3 to 0.8 at 500 掳C, hydrogen yield and hydrogen molar fraction will first increase and then decrease. They reach their respective maximum values of 0.245 mol/mol and 46.2% at n = 0.6 with the residence time of 2.96 min. There is an appropriate oxidation coefficient for obtaining the highest hydrogen yield for phenol supercritical water partial oxidative gasification (SWPO). Na₂CO₃ can serve as a catalyst or an additive for phenol SWPO. When 0.1 wt % Na₂CO₃ is added, hydrogen yield is near 0.477 mol/mol at n = 0.6, 500 掳C with the residence time of 2.96 min. Furthermore, the potential conversion pathways for phenol SWPO with Na₂CO₃ catalyst are also proposed.