Description: Das Projekt "Neue energiesparende Prozessablaeufe in der Industrie: Die direkte Umwandlung von Methan in Ethylen, Methanol und Formaldehyd" wird vom Umweltbundesamt gefördert und von Universität Karlsruhe (TH), Institut für Chemische Verfahrenstechnik durchgeführt. The development of direct (one-step) and energy efficient processes for the conversion of methane to ethylene and to methanol/formaldehyde has been a long-sought goal. Despite intensive research during the last twelve years the maximum ethylene and formaldehyde yields obtained in laboratory-scale reactors until 1994 was of the order of 20 percent and 5 percent respectively. This is due to the much higher reactivity with oxygen of the partial oxidation products (ethylene and methanol/formaldehyde respectively) than that of methane. In 1994 one of the participating research teams (University Patras) developed a novel laboratory scale gas-recycle reactor separator which gave ethylene yields up to 85 percent for the oxidative coupling of methane (OCM) (Science 264, 1583, 1994). In this novel reactor-seperator ethylene and ethane are trapped, and thus protected from further oxidation, in a molecular sieve trap in the recycle loop. They are then released by subsequent heating of the molecular sieve trap. The above very encouraging results were obtained in a small microreactor (catalyst mass 0.1 g, molecular sieve mass 2-3g) able to handle up to 3 ccSTP/min of CH4. The objectives of the research are: 1. To study the scale-up of the novel reactor separator for ethylene production by building benchscale units able to convert up to 1000 ccSTP/mm of CH4 each to ethylene. The units will employ a fixed-bed reactor with an optimized catalyst composition, and an optimally designed swing-bed molecular sieve trap. The target is to achieve ethylene yields above 65 percent with a recycle ratio less than eight. 2. To construct and test a similar catalytic reactor-separator for the production of methanol/formaldehyde from methane (up to 1000 ccSTP/min). The difference from case 1 is in the selection of the catalytic and adsorbent materials. The target for the methane to methanol/formaldehyde (MMF) process is a total product yield of 55 percent at a recycle ratio less than fifty. These new one-step processes are both exothermic and will have a very strong potential to replace the existing two- or three-step commercial routes for the production of ethylene and methanol which involve severely endothermic steps.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Äthan ? Ethylen ? Karlsruhe ? Recycling ? Methanol ? Adsorptionsmittel ? Katalysator ? Sauerstoff ? Formaldehyd ? Festbettreaktor ? Gebäude ? Methan ? Industrie ? Siebanalyse ? Chemische Verfahrenstechnik ? Energieeinsparung ? Oxidation ? Reaktor ? Studie ? Heizung ? Maßstabsvergrößerung ?
Region: Baden-Württemberg
Bounding box: 9° .. 9° x 48.5° .. 48.5°
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 1996-01-01 - 1998-06-30
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