EFFECTS OF PRESSURE, 3RD BODIES, AND TEMPERATURE PROFILING ON THE NONCATALYTIC PARTIAL OXIDATION OF METHANE

被引:45
作者
FENG, WY [1 ]
KNOPF, FC [1 ]
DOOLEY, KM [1 ]
机构
[1] LOUISIANA STATE UNIV,DEPT CHEM ENGN,BATON ROUGE,LA 70893
关键词
D O I
10.1021/ef00046a001
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Partial oxidation of methane to methanol was examined using a new type of reactor tube, single-crystal sapphire, at 10-70 bar, 5-10 mol % O2 in the feed, and residence times from 0.8 to 7.8 min. Both the heated length of the tube and the surface area/volume were kept relatively small in comparison to some past studies. Methanol selectivities of ca. 70% at C1/O2 = 14.3 (C1/air = 3) and 55-60% at C1/O2 = 5.7 (C1/air = 1.2) were attained at 100% O2 conversion. At 100% O2 conversion, reactor residence time and temperature profile (e.g., reactor quench cooling, feed preheating) appeared to have little effect on CH3OH selectivities. Longer residence times can increase methane conversion at constant temperature until 100% O2 conversion is reached. The addition Of CO2 to increase total pressure favorably affects both selectivity and conversion. These results are compared to previous work on low-temperature, homogeneous methane oxidation; differences are explained in terms of different reactor geometries and reactor surfaces and the effects of total pressure on elementary radical reactions.
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收藏
页码:815 / 822
页数:8
相关论文
共 37 条
[1]   INFLUENCE OF HOMOGENEOUS GAS-PHASE REACTIONS IN THE PARTIAL OXIDATION OF METHANE TO METHANOL AND FORMALDEHYDE IN THE PRESENCE OF OXIDE CATALYSTS [J].
BALDWIN, TR ;
BURCH, R ;
SQUIRE, GD ;
TSANG, SC .
APPLIED CATALYSIS, 1991, 74 (01) :137-152
[2]  
Brown M. J., 1991, CATAL TODAY, V8, P305, DOI 10.1016/0920-5861(91)80056-F
[3]   DIRECT CONVERSION OF METHANE INTO METHANOL [J].
BURCH, R ;
SQUIRE, GD ;
TSANG, SC .
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS I, 1989, 85 :3561-3568
[4]   Effects of temperature and pressure on the upper explosive limit of methane-oxygen mixtures [J].
Cooper, CM ;
Wiezevich, PJ .
INDUSTRIAL AND ENGINEERING CHEMISTRY, 1929, 21 :1210-1214
[5]   RATE CONSTANTS FOR THE REACTIONS OF CH3O2 WITH HO2 NO AND NO2 USING MOLECULAR MODULATION SPECTROMETRY [J].
COX, RA ;
TYNDALL, GS .
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS II, 1980, 76 :153-163
[6]   A COMPREHENSIVE STUDY OF METHANOL KINETICS IN FREELY-PROPAGATING AND BURNER-STABILIZED FLAMES, FLOW AND STATIC REACTORS, AND SHOCK-TUBES [J].
EGOLFOPOULOS, FN ;
DU, DX ;
LAW, CK .
COMBUSTION SCIENCE AND TECHNOLOGY, 1992, 83 (1-3) :33-75
[7]  
FENG W, 1992, THESIS LOUISIANA STA
[8]  
Foral M. J., 1992, PREPR AM CHEM SOC DI, V37, P34
[9]   DIRECT CATALYTIC-OXIDATION OF METHANE TO METHANOL - A REVIEW [J].
FOSTER, NR .
APPLIED CATALYSIS, 1985, 19 (01) :1-11
[10]  
FOULDAS GA, 1992, PREPR AM CHEM SOC DI, V37, P26