Abstract
AbstractOxidation, pyrolysis and hydrolysis of methane, ethane, methanol and to some extent heptane and toluene, in supercritical water or nitrogen, at temperatures to 600°C and pressures to 1000 bar were studied. Temperatures of the reactive mixtures were always above the respective critical curves. Oxidation was performed with oxygen or air injection, flameless or with diffusion flames. High pressure, non‐corrosive reaction vessels of different types and the complementary apparatus for high pressure injection and analysis are described.Flameless oxidation of methane in homogeneous supercritical aqueous mixtures produces CO, CO2, H2and CH3OH. Methanol formation can reach 30% of reacted methane, “selectivity”, at 600 bar. High pressure increases the methanol selectivity, flame reaction decreases it. Overall rate constants are given. Similar studies were made with supercritical aqueous ethane mixtures. Hydrothermal pyrolysis, “hydrothermolysis”, was investigated. Even at 600°C and 600 bar less than 3% methane decomposed after 120 minutes. Pyrolysis of methanol at 500°C and 600 bar is much slower in an aqueous environment than in nitrogen. Hydrothermal soot formation was studied with several hydrocarbons in supercritical fluids. Water, as compared with argon, as a mixture component appears to suppress soot formation. CO conversion with supercritical water was also quantitatively pursued.
References
56
Referenced
74
{'key': 'e_1_2_1_2_2', 'volume-title': 'Physicochemical Effects of Pressure', 'author': 'Hamann S. D.', 'year': '1957'}
/ Physicochemical Effects of Pressure by Hamann S. D. (1957){'key': 'e_1_2_1_3_2', 'volume-title': 'Liquid Phase High Pressure Chemistry', 'author': 'Isaacs N. S.', 'year': '1981'}
/ Liquid Phase High Pressure Chemistry by Isaacs N. S. (1981){'key': 'e_1_2_1_4_2', 'volume-title': 'High Pressure Chemical Synthesis', 'author': 'Jurczak J.', 'year': '1989'}
/ High Pressure Chemical Synthesis by Jurczak J. (1989)10.1002/bbpc.199000003
{'key': 'e_1_2_1_6_2', 'volume-title': 'Chemical Thermodynamics', 'author': 'Schneider G. M.', 'year': '1978'}
/ Chemical Thermodynamics by Schneider G. M. (1978){'key': 'e_1_2_1_7_2', 'volume-title': 'Liquids and Liquid Mixtures', 'author': 'Rowlinson J. S.', 'year': '1982'}
/ Liquids and Liquid Mixtures by Rowlinson J. S. (1982)10.1524/zpch.1963.37.5_6.387
10.1021/j100180a003
10.1002/bbpc.19670710618
/ Ber. Bunsenges. Phys. Chem. by Alwani Z. (1967)- H.Welsch Die Fluiden Systeme H2O—Xe und H2O—CH4bei hohen Drücken und Temperaturen Thesis Inst. of Phys. Chem. Univ. Karlsruhe (1973).
-
V. M.Shmonov R. J.Sadus andE. U.Franck J. Phys. Chem.97(1993) in press.
(
10.1021/j100137a036
) 10.1002/cite.330391309
10.1002/bbpc.19850891206
10.1002/bbpc.19810850103
10.1002/bbpc.198800149
- R. W.Shaw T. B.Brill A. A.Clifford C. A.Eckert andE. U.Franck Chem. Eng. News Dec.23(1992).
{'key': 'e_1_2_1_18_2', 'volume-title': 'Ed.: 2nd Internatl. Symposium on Supercritical Fluids', 'author': 'McHugh M. A.', 'year': '1991'}
/ Ed.: 2nd Internatl. Symposium on Supercritical Fluids by McHugh M. A. (1991)10.1002/bbpc.19800840814
10.1063/1.555632
10.1002/bbpc.19900940219
10.1016/0021-9614(87)90130-3
10.1016/0016-2361(88)90344-4
10.1021/ie00086a006
10.1021/ie00073a026
10.1021/i300018a025
10.1016/0016-2361(89)90096-3
10.1021/ja00161a043
{'key': 'e_1_2_1_29_2', 'first-page': '125', 'volume-title': '7th Symp. (intern.) on Combustion', 'author': 'Enikolopyan N. S.', 'year': '1958'}
/ 7th Symp. (intern.) on Combustion by Enikolopyan N. S. (1958){'key': 'e_1_2_1_30_2', 'volume-title': 'Chemistry of Combustion Reactions', 'author': 'Minkoff G. J.', 'year': '1962'}
/ Chemistry of Combustion Reactions by Minkoff G. J. (1962){'key': 'e_1_2_1_31_2', 'first-page': '26', 'volume': '8', 'author': 'Modell M.', 'year': '1982', 'journal-title': 'Solid Wastes Management'}
/ Solid Wastes Management by Modell M. (1982)10.1089/hzw.1984.1.453
- Proceedings of the Workshop on Supercritical Fluid Processing of High Risk Wastes Los Alamos Natl. Lab. Rep. LA‐UR‐90–825 (1989).
- W.Schilling Verbrennung und Flammen bei Drücken bis 1000 bar Thesis Inst. f. Phys. Chem. Univ. Karlsruhe1989.
- Th.Hirth Thesis: Pyrolyse Hydrolyse Oxidation in überkritischem Wasser bei 1000 bar Int. f. Phys. Chem. Univ. Karlsruhe1992.
{'key': 'e_1_2_1_36_2', 'volume-title': 'Flame Structure', 'author': 'Fristrom R. M.', 'year': '1965'}
/ Flame Structure by Fristrom R. M. (1965)10.1351/pac199062050839
- J.Steinle Hochdruck‐Verbrennung in homogenen Gasphasen Thesis Inst. f. Phys. Chem. Univ. Karlsruhe1993).
10.1002/bbpc.19930970710
10.1002/bbpc.19670710506
/ Ber. Bunsenges. Phys. Chem. by Lüdemann H. D. (1967)10.1002/bbpc.19680720406
/ Ber. Bunsenges. Phys. Chem. by Lüdemann H. D. (1968)10.1021/ja01089a023
- P. A.WebleyandJ. W.Tester in:Supercritical Fluid Science and Technology ACS Symp. Ser.406 (1989).
10.1021/ef00027a009
10.1016/0896-8446(92)90018-F
{'key': 'e_1_2_1_46_2', 'first-page': '217', 'volume-title': '23. Symp. (Int.) on Combustion', 'author': 'Melius C. F.', 'year': '1990'}
/ 23. Symp. (Int.) on Combustion by Melius C. F. (1990){'key': 'e_1_2_1_47_2', 'first-page': '191', 'volume': '922', 'author': 'Luers‐Jongen B.', 'year': '1991', 'journal-title': 'VDI‐Bericht Nr.'}
/ VDI‐Bericht Nr. by Luers‐Jongen B. (1991)10.1016/0010-2180(81)90159-0
- B. S.HaynesandH. Gg.Wagner Progr. Energy Combust. Sci. Vol. 7 229(1981).
{'key': 'e_1_2_1_50_2', 'first-page': '857', 'volume-title': '20th Symp. (Int.) on Combustion', 'author': 'Homann K. H.', 'year': '1984'}
/ 20th Symp. (Int.) on Combustion by Homann K. H. (1984)- G.Pohsner Spektren und Temperaturen von Flammen in überkritischem Wasser bis 1000 bar Thesis Inst. f. Phys. Chem. Univ. Karlsruhe1992.
{'key': 'e_1_2_1_52_2', 'first-page': '820', 'volume-title': 'High Pressure Science and Technology', 'author': 'Wagner H. Gg.', 'year': '1979'}
/ High Pressure Science and Technology by Wagner H. Gg. (1979){'key': 'e_1_2_1_53_2', 'volume-title': 'Pyrolysis: Theory and Industrial Practice', 'author': 'Albright L. F.', 'year': '1983'}
/ Pyrolysis: Theory and Industrial Practice by Albright L. F. (1983)10.1021/es00176a012
10.1021/ef00005a008
{'key': 'e_1_2_1_56_2', 'volume-title': 'Chemical Processes', 'author': 'Hougen O. A.', 'year': '1947'}
/ Chemical Processes by Hougen O. A. (1947){'key': 'e_1_2_1_57_2', 'volume-title': 'Heterogeneous Catalysis in Industrial Practice', 'author': 'Satterfield C. N.', 'year': '1991'}
/ Heterogeneous Catalysis in Industrial Practice by Satterfield C. N. (1991)
Dates
Type | When |
---|---|
Created | 13 years, 1 month ago (July 26, 2012, 6:34 a.m.) |
Deposited | 1 year, 4 months ago (April 27, 2024, 9:59 a.m.) |
Indexed | 1 year, 2 months ago (June 24, 2024, 10:13 p.m.) |
Issued | 31 years, 11 months ago (Sept. 1, 1993) |
Published | 31 years, 11 months ago (Sept. 1, 1993) |
Published Online | 15 years, 3 months ago (May 8, 2010) |
Published Print | 31 years, 11 months ago (Sept. 1, 1993) |
@article{Hirth_1993, title={Oxidation and Hydrothermolysis of Hydrocarbons in Supercritical Water at High Pressures}, volume={97}, ISSN={0005-9021}, url={http://dx.doi.org/10.1002/bbpc.19930970905}, DOI={10.1002/bbpc.19930970905}, number={9}, journal={Berichte der Bunsengesellschaft für physikalische Chemie}, publisher={Wiley}, author={Hirth, Th. and Franck, E. U.}, year={1993}, month=sep, pages={1091–1097} }