摘要:
An exothermic reaction and an endothermic reaction are thermally combined in a reactor having at least one oxygen selective ion transport membrane that provides the exothermic reaction with oxygen from an oxygen-containing gas such as air. The thermal requirements of the endothermic reaction are satisfied by the exothermic reaction. Dependent on the reactor design employed, the exothermic and endothermic reactions may be gaseously combined.
摘要:
A reactor comprising: a hollow shell defining a hermetic enclosure; a plurality of tube sheets disposed within said hermetic enclosure, a first one of said plurality of tube sheets defining a first chamber; at least one reaction tube each having a first end and an opposing second end, said first end being fixedly attached and substantially hermetically sealed to one end of said plurality of tube sheets and opening into said first chamber, the second end being axially unrestrained; each of said reaction tubes is comprised of an oxygen selective ion transport membrane with an anode side wherein said oxygen selective ion transport membrane is formed from a mixed conductor metal oxide that is effective for the transport of elemental oxygen at elevated temperatures and at least a portion of said first and second heat transfer sections are formed of metal; each of said reaction tubes includes first and second heat transfer sections and a reaction section, said reaction section disposed between said first and second heat transfer sections; a reforming catalyst disposed about said anode side of said oxygen selective ion transport membrane; a first process gas inlet; a second process gas inlet; and, a plurality of outlets.
摘要:
An ion transport reactor and process for using same having at least one ion transport membrane with a retentate side and a permeate side, for extracting oxygen from a feed gas stream as it flows along the retentate side. A reactant gas stream is flowed along the permeate side of the ion transport tubes to react with the oxygen transported therethrough. Heat is transferred to a fluid stream flowing through the ion transport reactor while the temperature of the membrane is maintained within its operating range.
摘要:
A method of producing a crude syngas product stream or a syngas product stream by further processing of the crude syngas product stream. Both the crude and syngas product stream comprise carbon monoxide and hydrogen. The crude syngas product stream additionally comprises carbon dioxide and moisture. In accordance with the method, methane in a feed stream is converted into the hydrogen and carbon monoxide in at least two stages, thereby to form a crude syngas stream. An initial stage has an oxygen transport membrane reactor having a catalyst to promote carbon dioxide or steam methane reforming. Since, the conversion is shared between two stages, the oxygen transport membrane reactor can be operated at a sufficiently low temperature to avoid ceramic membrane deterioration due to creep effect. The subsequent stage can be operated at a higher temperature with more favorable equilibrium conditions to complete the conversion of the methane.
摘要:
In a method for the production of carbon dioxide, an oxygen-containing first process gas is flowed along a cathode side of a first oxygen selective ion transport membrane. The membrane is at operating conditions effective to transport a first permeate oxygen portion from the cathode side to an opposite anode side. A carbon-containing second process gas is flowed along the anode side at a flow rate effective to provide a stoichiometric surplus of oxygen on combination with the first permeate oxygen portion. A first mixture of a second process gas and the first permeate oxygen portion is combusted such that substantially all of the second process gas is converted into a second mixture of water and carbon dioxide. The carbon dioxide is separated from such second mixture.
摘要:
Methane is formed into synthesis gas through a combination of a partial oxidation reaction and a steam reforming reaction. Oxygen for the partial oxidation reaction is obtained by contacting air with an oxygen transport membrane and recovering the oxygen transported through the membrane. To increase the oxygen flux through the membrane, steam is utilized as a sweep gas on the anode side of the membrane. The steam reduces the oxygen partial pressure on the anode side increasing the flux. The efficiency and cost benefit of the process is enhanced by utilizing in-line combustors to heat gases being delivered to the oxygen transport membrane. Membrane integrity is enhanced by conducting the reactions in a reactor that is remote from the oxygen transport membrane.
摘要:
A process to generate an enhanced output of a desired product from an ion transport reactor utilizes the reaction products from both the cathode side and the anode side of an oxygen selective ion transport ceramic membrane. An oxygen donating first feed stream containing the desired product in a chemically bound state is delivered to the cathode side while an oxygen accepting second feed stream is delivered to the anode side. Following chemical reactions on both the cathode side and the anode side, a desired product is recovered from a first product stream exiting from the cathode side and from a second product stream exiting from the anode side such that the sum of the desired product contained within the two product streams exceeds that attainable from either product stream alone.
摘要:
A low energy cost process for the co-production of oxygen and nitrogen employing a fuel tube extending into the first oxygen selective ion transport membrane whereby fuel is introduced adjacent to the closed end and flows cocurrently with oxygen containing gas in the annulus and an oxygen selective ion transport membrane having a separator section and a reactor section. An oxygen-containing feedstock, typically air, is compressed and then contacts the cathode side of the separator section where a portion of the oxygen contained within the feedstock is transported to the anode side of the separator section and recovered as an oxygen product gas. Substantially the remainder of the oxygen contained within the feedstock is transported from the cathode side of the reactor section to the anode side and exothermically reacted with a fuel. Following the exothermic reaction, hot nitrogen rich product gas is expanded in a turbine to generate the power necessary to compress the feedstock. Expanded nitrogen rich product gas may then be recovered from the turbine exhaust.
摘要:
A system and process for producing a high-purity product from a feed stream containing elemental oxygen by applying the feed stream to at least one separator including a feed zone and a permeate zone separated by a solid electrolyte membrane, and driving a portion of oxygen contained in the feed stream from the feed zone to the permeate zone via the membrane by applying to the permeate zone a reactive purge stream containing a reactive gas which combines with oxygen to establish a lower partial pressure of oxygen in that zone. Oxygen-depleted retentate is withdrawn as a high-purity product stream.
摘要:
Syngas, a mixture of hydrogen and carbon monoxide, is an intermediate in the conversion of methane to liquid fuels. For certain applications, it is desirable to maintain an H2/CO molar ratio of about 3. This molar ratio is achieved by steam reforming of methane in accordance with: CH4+H2O→3H2+CO. To provide the heat required to drive the endothermic steam reforming reaction, a low grade fuel is combusted in a reactor and the heat of combustion conducted to the endothermic reaction. By using an oxygen selective ion transport membrane element to transport the oxygen required for combustion, the formation of undesirable NOx compounds is minimized.