...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fuel >Oxidation characteristics and products of five ethers at low temperature
【24h】

Oxidation characteristics and products of five ethers at low temperature

机译：五种醚在低温下的氧化特性及产物

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The oxidation characteristics and products of five ethers - ethyl tert-butyl ether (ETBE), methyl tert-butyl ether (MTBE), dimethyl ether (DME), diethyl ether (DEE), and diisopropyl ether (DIPE) - were determined using an accelerating rate calorimeter (ARC) at low temperatures. Oxidation temperature and pressure were calculated using temperature-time (T-t) and pressure-time (P-t) plots, and reaction products were analyzed by gas chromatography-mass spectrometry (GC-MS). Results showed that the oxidation reaction pathway of ethers with oxygen occurred in three stages: (1) promotion of oxygen and peroxide absorption by ether; (2) generation of free radicals by thermal decomposition; and (3) complex oxidation caused by free radicals. Initial auto-oxidation temperatures of DME, DEE, DIPE, MTBE, and ETBE were approximately 393 K, 389 K, 359 K, 413 K, and 383 K, respectively, and the activation energies (E-a) for thermal decomposition were 167.3 kJ/mol, 126.7 kJ/mol, 111.6 kJ/mol, 236.7 kJ/mol, and 159.1 kJ/mol, respectively, for the first-order reaction. Peroxides of DEE, DIPE, MTBE, and ETBE were identified by iodimetry analysis when oxidation temperature was 333 K. Oxidation reaction products were complex and included alcohols, aldehydes, ketones, acids, esters, and carbon dioxide. (C) 2015 Elsevier Ltd. All rights reserved.
机译：使用乙腈测定了五种醚的氧化特性和产物-乙基叔丁基醚（ETBE），甲基叔丁基醚（MTBE），二甲基醚（DME），二乙醚（DEE）和二异丙醚（DIPE）。低温下的加速速率量热仪（ARC）。使用温度-时间（T-t）和压力-时间（P-t）图计算氧化温度和压力，并通过气相色谱-质谱（GC-MS）分析反应产物。结果表明，醚与氧的氧化反应过程分为三个阶段：（1）促进醚吸收氧和过氧化物； （2）通过热分解产生自由基； （3）自由基引起的复杂氧化。 DME，DEE，DIPE，MTBE和ETBE的初始自氧化温度分别约为393 K，389 K，359 K，413 K和383 K，热分解的活化能（Ea）为167.3 kJ /。一级反应分别为mol，126.7 kJ / mol，111.6 kJ / mol，236.7 kJ / mol和159.1 kJ / mol。当氧化温度为333 K时，通过碘量分析确定了DEE，DIPE，MTBE和ETBE的过氧化物。氧化反应产物很复杂，包括醇，醛，酮，酸，酯和二氧化碳。 （C）2015 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号