高校化学工程学报
高校化學工程學報
고교화학공정학보
JOURNAL OF CHEMICAL ENGINEERING OF CHINESE UNIVERSITIES
2010年
2期
354-357
,共4页
黄品鲜%刘雄民%加藤胜美%和田有司%田村昌三
黃品鮮%劉雄民%加籐勝美%和田有司%田村昌三
황품선%류웅민%가등성미%화전유사%전촌창삼
二甲醚%液化石油气%热稳定性%加速量热仪
二甲醚%液化石油氣%熱穩定性%加速量熱儀
이갑미%액화석유기%열은정성%가속량열의
dimethyl ether%liquefied petroleum gas%thermal stability%accelerating rate calorimeter
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(T_o)和活化能(E_a),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T_o分别为180℃和150℃,反应活化能E_a分别为203.2 kJ·mol~(-1)和188.6 kJ·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,T_o和E_a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,CH_3OH,HCOOCH_3,HCOOH,CH_3OCH_2CH_2OCH,H_3CH(OH)CH_3,CH_3C(O)CH_3,CH_3CH_2CH_2OH,(CH_3)_2CHCH_2OCH_3, CH_3CH_2CH_2CH_2OCH_3等20种化合物.
採用加速量熱儀(ARC)分彆測定瞭液化石油氣(LPG)及其DME/LPG的氧化反應初始溫度(T_o)和活化能(E_a),攷察瞭添加劑對氧化反應的穩定性效應,用氣相色譜-質譜聯用儀(GC-MS)分析熱分解產物.結果錶明, LPG和DME/LPG的T_o分彆為180℃和150℃,反應活化能E_a分彆為203.2 kJ·mol~(-1)和188.6 kJ·mol~(-1).氧的存在是導緻LPG及其DME/LPG熱穩定性下降重要因素,特彆是有過氧化物存在下,由于自由基的引髮,顯著降低LPG、DME/LPG氧化反應的初始溫度和反應活化能,在氧化反應體繫中添加Fe、Al時,T_o和E_a值減小,穩定性降低,抗氧劑能提高它們的熱穩定性.DME/LPG氧化產物主要有HCHO,CH_3OH,HCOOCH_3,HCOOH,CH_3OCH_2CH_2OCH,H_3CH(OH)CH_3,CH_3C(O)CH_3,CH_3CH_2CH_2OH,(CH_3)_2CHCH_2OCH_3, CH_3CH_2CH_2CH_2OCH_3等20種化閤物.
채용가속량열의(ARC)분별측정료액화석유기(LPG)급기DME/LPG적양화반응초시온도(T_o)화활화능(E_a),고찰료첨가제대양화반응적은정성효응,용기상색보-질보련용의(GC-MS)분석열분해산물.결과표명, LPG화DME/LPG적T_o분별위180℃화150℃,반응활화능E_a분별위203.2 kJ·mol~(-1)화188.6 kJ·mol~(-1).양적존재시도치LPG급기DME/LPG열은정성하강중요인소,특별시유과양화물존재하,유우자유기적인발,현저강저LPG、DME/LPG양화반응적초시온도화반응활화능,재양화반응체계중첨가Fe、Al시,T_o화E_a치감소,은정성강저,항양제능제고타문적열은정성.DME/LPG양화산물주요유HCHO,CH_3OH,HCOOCH_3,HCOOH,CH_3OCH_2CH_2OCH,H_3CH(OH)CH_3,CH_3C(O)CH_3,CH_3CH_2CH_2OH,(CH_3)_2CHCH_2OCH_3, CH_3CH_2CH_2CH_2OCH_3등20충화합물.
Using accelerating rate calorimeter (ARC), the initial oxidation temperatures (T_0) and oxidation activation energies (E_a) 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 E_a 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 H_2O_2 or other organic peroxides which could easily initiate the formation of free radicals; and the addition of Fe or Al will decrease the T_0 and E_a 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, CH_3OH, HCOOCH_3, HCOOH, CH_3OCH_2CH_2OCH, H_3CH(OH)CH_3, CH_3C(O)CH_3, CH_3CH_2CH_2OH, (CH_3)_2CHCH_2OCH_3, CH_3CH_2CH_2CH_2OCH_3 et al.
