Direct Methane Conversion to Methanol. Quarterly Project Status Report, October 1, 1992--December 31, 1992 PDF Download
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Languages : en
Pages : 3
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We proposed to demonstrate the effectiveness of a catalytic membrane reactor (a ceramic membrane combined with a catalyst) to selectively produce methanol by partial oxidation of methane. Methanol is used as a chemical feedstock, gasoline additive, and turbine fuel. Methane partial oxidation using a catalytic membrane reactor has been determined as one of the promising approaches for methanol synthesis from methane. In the original proposal, the membrane was used to be used to selectively remove methanol from the reaction zone before carbon oxides form, thus increasing the methanol yield. Methanol synthesis and separation in one step would also make methane more valuable for producing chemicals and fuels. The cooling tube inserted inside the membrane reactor has created a low temperature zone that rapidly quenches the product stream. This system has proved effective for increasing methanol selectivity during CH4 oxidation, and we are using and modifying this non-isothermal, non-permselective membrane reactor.
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Languages : en
Pages : 3
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Book Description
We proposed to demonstrate the effectiveness of a catalytic membrane reactor (a ceramic membrane combined with a catalyst) to selectively produce methanol by partial oxidation of methane. Methanol is used as a chemical feedstock, gasoline additive, and turbine fuel. Methane partial oxidation using a catalytic membrane reactor has been determined as one of the promising approaches for methanol synthesis from methane. In the original proposal, the membrane was used to be used to selectively remove methanol from the reaction zone before carbon oxides form, thus increasing the methanol yield. Methanol synthesis and separation in one step would also make methane more valuable for producing chemicals and fuels. The cooling tube inserted inside the membrane reactor has created a low temperature zone that rapidly quenches the product stream. This system has proved effective for increasing methanol selectivity during CH4 oxidation, and we are using and modifying this non-isothermal, non-permselective membrane reactor.
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Languages : en
Pages : 9
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Objective is to demonstrate the effectiveness of a catalytic membrane reactor (ceramic membrane combined with catalyst) to selectively produce methanol by partial oxidation of methane. None of the membranes tested in a high pressure system could selectively remove methanol, until a cooling tube was inserted inside the membrane reactor to quench the product stream; this effectively increased methanol selectivity 2 x during methane oxidation. For both conditions, combined selectivity for methanol and CO is constant, 85%. The remaining product is CO2. The membranes were broken when removed from the system; this was remedied when a cooling tube with a smaller diameter was used.
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Category : Power resources
Languages : en
Pages : 782
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Category : Government publications
Languages : en
Pages : 1452
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Category : Science
Languages : en
Pages : 1438
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Author:
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Category :
Languages : en
Pages : 12
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Book Description
We proposed to demonstrate the effectiveness of a catalytic membrane reactor (a ceramic membrane combined with a catalyst) to selectively produce methanol by partial oxidation of methane. Methanol is used as a chemical feedstock, gasoline additive, and turbine fuel. Methane partial oxidation using a catalytic membrane reactor has been determined as one of the promising approaches for methanol synthesis from methane. In the original proposal, the membrane was used to selectively remove methanol from the reaction zone before carbon oxides form, thus increasing the methanol yield. Methanol synthesis and separation in one step would also make methane more valuable for producing chemicals and fuels. The cooling tube inserted inside the membrane reactor has created a low temperature zone that rapidly quenches the product stream. This system has proved effective for increasing methanol selectivity during CH4 oxidation. The membranes broke during experiments, however, apparently because of the large radial thermal gradient and axial thermal expansion difference. Our efforts concentrated on improving the membrane lifetime by modifying this non-isothermal membrane reactor.
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Languages : en
Pages : 8
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We proposed to demonstrate the effectiveness of a catalytic membrane reactor (a ceramic membrane combined with a catalyst) to solely produce methanol by partial oxidation of methane. Methanol is used as a chemical feedstock, gasoline additive, and turbine fuel. Methane partial oxidation using a catalytic membrane reactor has been determined as one of the promising approaches for methanol synthesis from methane. In the original proposal the membrane was used to selectively remove methanol from the reaction zone before carbon oxides form, thus increasing the methanol yield. Methanol synthesis and separation in one step would also make methane more valuable for producing chemicals and fuels. The cooling tube inserted inside the membrane reactor has created a low temperature zone that rapidly quenches the product stream. Both ceramic and metal membranes were tested in this study and similar results were obtained. This membrane reactor system has proved effective for increasing methanol selectivity during CH4 oxidation. We are currently using this non-isothermal non-permselective membrane reactor, and evaluating modifications to further improve performance. Metal membrane was used to avoid the membrane breakage problem. A series of experiments were carried out in order to optimize the operation of the process. A methanol yield of 3.8% was obtained when 8% O2 was fed in a reactant mixture. The catalyst, MoO3/SiO2, was found not good for this methane partial oxidation process.
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Category : Power resources
Languages : en
Pages : 618
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Category :
Languages : en
Pages : 11
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The goal of this project is the development of novel, economical, processes for the conversion of natural gas to more valuable projects such as methanol, ethylene and other organic oxygenates or higher hydrocarbons. The methodologies of the project are to investigate and develop low temperature electric discharges and electric field-enhanced catalysis for carrying out these conversions. In the case of low temperature discharges, the conversion is carried out at ambient temperature which in effect trades high temperature thermal energy for electric energy as the driving force for conversion. The low operating temperatures relax the thermodynamic constraints on the product distribution found at high temperature and also removes the requirements of large thermal masses required for current technologies. With the electric field-enhanced conversion, the operating temperatures are expected to be below those currently required for such processes as oxidative coupling, thereby allowing for a higher degree of catalytic selectivity while maintaining high activity. During this quarter the authors worked on some kinetics experiments and also did some catalyst screening, particularly looking for correlations with surface OH and oxygen groups to help determine the manner in which these surfaces alter the selectivities. On the dielectric systems they looked at power versus frequency and conversions relationships, worked on oxygen utilization and started building a short residence time reactor for studying intermediate formation and destruction.
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Languages : en
Pages : 12
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A bench-scale reactor is being used to study the conversion of synthesis gas to methanol (MEOH) in the liquid phase by a novel method. In previous reports, we provided evidence for a two step reaction consisting of a carbonylation reaction taking place mainly in the ''film'' close to a copper chromite surface followed by a hydrogenolysis reaction taking place on the surface of the copper chromite. The interaction between the two catalysts enhances the rate of methanol formation. In this quarter, we reexamined the equilibrium concentration for methyl formate and obtained data at higher loadings of copper chromite.
