Thermal Coupling Of Methane Research Articles

95/05835 Thermal coupling of methane, experimental investigations on coke deposits

95/05835 Thermal coupling of methane, experimental investigations on coke deposits

Thermal coupling of methane, experimental investigations on coke deposits

We have studied the formation of coke during the thermal coupling of an equimolecular methanehydrogen mixture at 1230 °C and under a one-atmosphere pressure. Coke samples are recovered in rectangular boats placed along the pyrolysis reactor. The deposits show a non-homogeneousness of coke along the reactor in terms of deposition rate and in terms of structure. We observed at least two kinds of coke that settle at different rates along the pyrolysis reactor: (a) a silver-grey, uniform film and (b) a black powder. Transmission electron microscopy and oxidative pyroanalysis showed that the former is a well crystallized graphite-type coke with a highly refractory character, while the latter corresponds to amorphous powder carbon.

Thermal coupling of methane: Influence of hydrogen at 1330°C. Experimental and simulated results

Methane was decomposed in a plug-flow reactor at 1330°C and 1 atm. The methane feed was diluted with hydrogen (H 2:CH 4 = 0.5, 1 and 2). For simulations, the reactor was imitated with a cascade of 60 perfectly stirred reactors, and consideration was given to the temperature profile of the actual reactor. The chemkin code was used for numerical modeling. Simulations and analysis of the reaction rates showed that hydrogen acts as a diluent as well as a chemical agent via the following process: CH 4 + H· ⇄ ·CH 3 + H 2 Because of the reversibility of this process, the ·CH 3 concentration decreases, and hence the processes involving the ·CH 3 radical are less important. We also show that the ·C 2H 3 radical is the intermediate responsible for C 2H 2 formation by the following process: ·C 2H 3 ⇄ C 2H 2 + H· which is more favorable than the addition process because of the temperature (1330°C): C 2H 2 + ·C 2H 3 ⇄ ·C 4H 5 Considering the effect of hydrogen on ·CH 3 concentrations and hence on ·C 4H 5, the following process C 2H 2 + ·C 4H 5 ⇄ C 6H 6 + H· will also be disadvantaged, and this will be all the greater as dilution by H 2 is high. On the basis of experience, simulation shows that the increase in the H 2/CH 4 ratio leads to slower formation of benzene and heavy products, mainly to the benefit of C 2H 2.

Thermal coupling of methane: A comparison between kinetic model data and experimental data

Thermal coupling of methane was investigated in a tubular flow reactor in the temperature range 1200–1500°C at atmospheric pressure. The main products observed were ethane, ethene, ethyne, benzene and “coke”. A mechanistic simulation model was developed for this process. The kinetic scheme consists of 32 reversible free radical reactions and one irreversible free radical reaction. The model data provide good agreement with experimental data for the conditions being studied. A sensitivity analysis was used to find the main free radical reactions in the formation and consumption of the reported products.

Thermal coupling of methane in a tubular flow reactor: parametric study

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal coupling of methane in a tubular flow reactor: parametric studyFrancis G. Billaud, Francois Baronnet, and Christophe P. GueretCite this: Ind. Eng. Chem. Res. 1993, 32, 8, 1549–1554Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published inissue 1 August 1993https://doi.org/10.1021/ie00020a003RIGHTS & PERMISSIONSArticle Views373Altmetric-Citations33LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (534 KB) Get e-Alerts Get e-Alerts

Thermal coupling of methane in a tubular flow reactor: experimental setup and influence of temperature

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal coupling of methane in a tubular flow reactor: experimental setup and influence of temperatureFrancis G. Billaud, Christophe P. Gueret, and Francois BaronnetCite this: Ind. Eng. Chem. Res. 1992, 31, 12, 2748–2753Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 December 1992https://doi.org/10.1021/ie00012a018RIGHTS & PERMISSIONSArticle Views211Altmetric-Citations13LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (790 KB) Get e-Alerts Get e-Alerts

Production of Olefins and Higher Hydrocarbons by Thermal Coupling of Methane

Thermal coupling of methane or methane pyrolysis, which is a possible way for the direct chemical conversion of natural gas, can be used to produce ethylene, acetylene and benzene. But the high stability of methane requires a very high pyrolysis temperature (1200°C). To perform this reaction, IFP decided to build and elecric pilot furnace with an overall capacity of 10 m3/h. The design of this furnace is based on shell-and-tube heat exchanger technology with the use of new materials such as ceramics. This furnace has now been operating for more than one year without any noteworthy incident. First we will describe the technological and parametric study that has now been completed. In conclusion, we will make a short economic assessment of the production of ethylene and acetylene in France.