DME/LPG混合体系的氧化反应与热稳定性  

Oxidation Reaction of DME/LPG and its Thermal Stability

作　　者：黄品鲜[1] 刘雄民[1] 加藤胜美[2] 和田有司[3] 田村昌三[4] 

机构地区：[1]广西大学化学化工学院,广西南宁530004 [2]福冈大学 [3]日本产业技术综合研究所 [4]日本东京大学

出　　处：《高校化学工程学报》2010年第2期354-357,共4页Journal of Chemical Engineering of Chinese Universities

基　　金：广西自然科学基金项目(桂科基0639001);广西教育厅科研项目(200807MS149)

摘　　要：采用加速量热仪(ARC)分别测定了液化石油气(LPG)及其DME/LPG的氧化反应初始温度(To)和活化能(Ea),考察了添加剂对氧化反应的稳定性效应,用气相色谱-质谱联用仪(GC-MS)分析热分解产物。结果表明,LPG和DME/LPG的To分别为180℃和150℃,反应活化能Ea分别为203.2kJ·mol-1和188.6kJ·mol-1。氧的存在是导致LPG及其DME/LPG热稳定性下降重要因素,特别是有过氧化物存在下,由于自由基的引发,显著降低LPG、DME/LPG氧化反应的初始温度和反应活化能,在氧化反应体系中添加Fe、Al时,To和Ea值减小,稳定性降低,抗氧剂能提高它们的热稳定性。DME/LPG氧化产物主要有HCHO,CH3OH,HCOOCH3,HCOOH,CH3OCH2CH2OCH,H3CH(OH)CH3,CH3C(O)CH3,CH3CH2CH2OH,(CH3)2CHCH2OCH3,CH3CH2CH2CH2OCH3等20种化合物。Using accelerating rate calorimeter （ARC）, the initial oxidation temperatures （T0） and oxidation activation energies （Ea） of liquefied petroleum gas （LPG） and dimethyl ether （DME）/LPG were measured, and the effect of the additives on the stabilities of LPG and DME/LPG was studied. The results indicate that the T0 of LPG and DME/LPG are 180℃ and 150℃, respectively, and their Ea are 203.2 kJ·mol-1 and 188.6 kJ·mol-1, respectively. It was found that the stabilities of LPG and DME/LPG decrease with the presence of oxygen, especially with the presence of hydrogen peroxide H2O2 or other organic peroxides which could easily initiate the formation of free radicals; and the addition of Fe or Al will decrease the T0 and Ea of LPG and DME/LPG too. The compositions of the thermal decomposition products of LPG and DME/LPG were analyzed by GC-MS, and the results show that the oxidation reaction products of LPG and DME/LPG include about 20 compounds, such as HCHO, CH3OH, HCOOCH3, HCOOH, CH3OCH2CH2OCH, H3CH（OH）CH3, CH3C（O）CH3, CH3CH2CH2OH, （CH3）2CHCH2OCH3, CH3CH2CH2CH2OCH3 et al.

关 键 词：二甲醚 液化石油气 热稳定性 加速量热仪 

分 类 号：O643.12[理学—物理化学] TQ031.7[理学—化学]