摘要:
Petrochemicals are produced by the vapor phase reaction of a hydrocarbon with air in the presence of a suitable catalyst. The petrochemical product is removed from the product gas stream, and part or all of the remaining gas stream is passed through a bed of hydrophobic adsorbent, which adsorbs mainly the unreacted hydrocarbon from the gas stream without adsorbing water vapor. The adsorbed hydrocarbon is purged from the bed with air, and the air-hydrocarbon mixture is recycled to the partial oxidation reactor.
摘要:
An improved process for the catalytic partial oxidation of hydrocarbons to produce hydrogen and carbon monoxide and less than ˜2% carbon dioxide is disclosed. The process further permits the reaction to be initiated at room temperature, and utilizes a metal catalyst deposited on a ceria-coated zirconia monolith support, which exhibits high conversions of hydrocarbons to synthesis gas (hydrogen and carbon monoxide).
摘要:
A petrochemical is produced by the vapor phase reaction of a hydrocarbon with air in the presence of a suitable catalyst. The petrochemical is removed from the reactor effluent, and part or all of the remaining petrochemical-free gas stream is passed through a hydrocarbon-selective adsorbent, which adsorbs hydrocarbon from the gas stream, leaving a hydrocarbon-depleted waste gas. Hydrocarbon is purged from the adsorbent with air, and the air-hydrocarbon mixture is recycled to the partial oxidation reactor. The purge air, and preferably both the purge air and the petrochemical-free gas stream are dried by passage through beds of zeolite 3A prior to being introduced into the hydrocarbon-selective adsorbent, and the beds of zeolite 3A are regenerated by passing heated hydrocarbon-depleted waste gas therethrough.
摘要:
Hydrocarbon gas is separated from a gas mixture by concentration swing adsorption in a system consisting of a pair of adjacent adsorption beds that are contained in a cylindrical vessel and separated by a flat partition wall. The system is operated with the beds out of phase, such that one bed is in adsorption service while the other bed is regenerated by purging the bed with air. The pressure and temperature in the bed undergoing adsorption does not differ from the pressure and temperature, respectively in the bed being regenerated sufficiently to create significant stresses in the partition separating the beds. In a modified version, the gas mixture and purge air are dried by simultaneously passing these gases through one pair of adjacent adsorption beds that are contained in a cylindrical vessel and separated by a flat partition wall with the respective pressures and temperatures in the two beds being substantially equal, while a substantially identical pair of adjacent adsorption beds are being regenerated by passing heated nonadsorbed gas from the hydrocarbon adsorption system through the beds at a substantially constant temperature and pressure.
摘要:
Production of oxygen-enriched gas streams is disclosed herein. Air streams contact an oxygen-selective mixed conductor particularly a perovskite material whereby oxygen is retained or adsorbed on the perovskite and can be employed in a variety of processes such as in combusting a fuel gas, heat recovery and boiler related operations.
摘要:
Supported perovskite-type oxides are described. The perovskite-type oxides have the general formula of AxA′x′ByB′y′O3−δ, wherein A is an ion of a metal of Group IIIa or IIIb of the periodic table of elements or mixtures thereof; A′ is an ion of a metal of Groups Ia or IIa of the periodic table or mixtures thereof; B and B′ are ions of a d-block transition metal of the periodic table or mixtures thereof; x, x′, y and y′ vary from 0 to 1; 0.95
摘要翻译:描述了支承的钙钛矿型氧化物。 钙钛矿型氧化物具有以下通式:A A x B x Y B'y' 其中A是元素周期表IIIa或IIIb族金属的离子或其混合物; A'是周期表的Ia或IIa族金属的离子或其混合物; B和B'是周期表的d-块过渡金属的离子或其混合物; x,x',y和y'从0变化到1; 0.95
摘要:
A method for producing hydrogen by performing the steps of feeding a synthesis gas mixture to a pressure swing adsorption unit; producing hydrogen from the synthesis gas mixture in the pressure swing adsorption unit; feeding the remainder of the synthesis gas mixture at low pressure to an electrochemical cell wherein hydrogen is separated from the remainder of the synthesis gas mixture and is simultaneously pressurized; feeding the pressurized hydrogen from the electrochemical cell to join with the hydrogen generated in the pressure swing adsorption unit and recovering the combined hydrogen product. The synthesis gas mixture may be from a reformation unit and it may be subject to a water gas shift reaction. In addition to the production of hydrogen, the separation of hydrogen in the electrochemical cell increases the concentration of carbon dioxide in the residual waste gas and enables carbon dioxide recovery.
摘要:
A method for producing carbon dioxide by the steps of feeding a CO2-rich feed stream containing fuel gas to an oxygenated oxygen-selective ceramic bed to produce a product stream of carbon dioxide, water, and residual oxygen; adding oxygen to this product stream and feeding to an oxygen-depleted oxygen-selective ceramic bed and recovering carbon dioxide substantially free of oxygen and fuel gas. In an additional embodiment, nitrogen oxides are also removed from the fuel gas.
摘要:
Partial oxidation of hydrocarbons to produce hydrogen and carbon monoxide is carried out by a cyclical process, which includes (a) contacting an oxygen ion conducting ceramic with air at a pressure between about 1 and 50 bara in a reactor, wherein oxygen from the air reacts with the ceramic, thereby producing an oxygen-enriched ceramic, and (b) contacting the hot, oxygen-enriched ceramic with hydrocarbon gas and optionally steam in the reactor. During the partial oxidation reaction phase of the process, the oxygen-enriched ceramic reacts with the hydrocarbon, thereby producing the desired gas products and regenerating the oxygen ion conducting ceramic for the next cycle of the process.
摘要:
Multi compressor systems and apparatuses for the manufacture, storage and dispensing of manufactured hydrogen fuel to hydrogen vehicle tanks or remote mobile refuelers are disclosed.