化工学报 ›› 2008, Vol. 59 ›› Issue (10): 2634-2637.

• 能源和环境工程 • 上一篇    下一篇

二甲醚氧化反应及其添加剂效应

刘雄民;黄品鲜;加藤胜美;和田有司;田村昌三   

  1. 广西大学化学化工学院;日本产业技术综合研究所;日本横滨国立大学
  • 出版日期:2008-10-05 发布日期:2008-10-05

Oxidation of dimethyl ether and additives effect

LIU Xiongmin;HUANG Pinxian;KATOH Katsumi;WADA Yuji;TAMURA Masamitsu   

  • Online:2008-10-05 Published:2008-10-05

摘要: 采用加速量热仪(ARC)测定了二甲醚(DME)氧化反应温度变化和活化能(Ea),考察了添加剂对DME热稳定性效应,分析热分解产物,探讨氧化反应机理. 结果表明,DME热氧化反应初始温度(To)为120 ℃,反应活化能Ea=167.3 kJ•mol-1.氧的存在是导致DME热稳定性下降重要因素,在氧化反应体系中添加Fe、Fe2O3、Al等时, To和Ea值减小,它们有促进氧化反应作用,特别是有过氧化物存在下,由于自由基的引发,显著降低DME热反应初始温度和反应活化能,抗氧剂能提高热稳定性.

关键词:

二甲醚, 添加剂, 热稳定性, 加速量热仪, 活化能

Abstract:

Initiating temperature (To) and activation energy (Ea) for thermal oxidation of dimethyl ether (DME) was measured with accelerating rate calorimeter (ARC)The effect of additives on DME thermal stability was studiedThe product of DME thermal decomposition was analyzed with GCMSThe results indicated that the initiating temperature of DME oxidation was 120℃, activation energy was 167.3 kJ·mol-1 in vacuumDME stability was dramatically reduced in the presence of oxygenThe addition of Fe, Fe2 O3 and Al also decreased To and Ea of DME oxidation reaction, especially in the presence of hydrogen peroxide (H2O2) or other organic peroxides which can easy initiate the formation of free radicalsIn contrast, the presence of antioxidant can enhance DME thermal stability.

Key words:

二甲醚, 添加剂, 热稳定性, 加速量热仪, 活化能