摘要:
The present invention relates to a method to remove one or more contaminant from a gas stream, preferably a hydrocarbon gas steam, using a solid adsorbent, preferably a porous cross-linked polymeric adsorbent, a pyrolized macroporous polymer, or mixtures thereof and regenerating said adsorbent by an improved pressure swing adsorption process wherein a portion of the product gas is heated and used as the purge gas.
摘要:
A method and apparatus for removing water from compressed air is disclosed. The method includes the steps of passing a stream of compressed air through a pressure swing adsorption (PSA) dryer. The dryer one or a pair of vessels containing a desiccant material bound into pieces, for example tubes, using a polymer binder. The PSA dryer also has a control system for controlling the flow of the compressed air and switching between drying and purging modes. In particular the vessel and desiccant material contained therein are sized to produce a dew point suppression of less than 50°C.
摘要:
A process for the reduction of the level of water, carbon dioxide and nitrous oxide in a feed air stream prior to cryogenic distillation, comprising: a) passing said feed air stream at a feed temperature and a feed pressure in a feed direction through a first adsorbent, whose Henry's Law selectivity for CO 2 over N 2 O measured at 30 °C is at least 12.5, and subsequently through a second adsorbent, whose Henry's Law constant for the adsorption of CO2 measured at 30 °C is less than 1020 mmol/g/atom and whose Henry's Law selectivity for CO 2 over N 2 O measured at 30 °C is at most 5; b) ceasing after a first time period to pass said feed air stream to said first and second adsorbents; c) depressurising the gas in contact with the first and second adsorbents to a second pressure lower than the feed pressure; d) passing a heated regenerating gas at the second pressure and at a temperature which is between 20 °C and 80 °C to at least the second adsorbent in a direction opposite to the feed direction for a second time period, and subsequently passing a second regenerating gas at the second pressure and at a temperature less than the temperature of the heated regenerating gas to the first and second adsorbents in a direction opposite to the feed direction for a third time period; e) ceasing passing regenerating gas to the first and second adsorbents; f) re-pressurising the gas in contact with the first and second adsorbents to the feed pressure; and g) repeating steps a) to f), wherein the second adsorbent occupies from 25% to 40% by volume of the total volume of the first and second adsorbents, and wherein the temperature of the heated regenerating gas is from 10 °C to 60 °C higher than the feed temperature or the temperature of the second regenerating gas, whichever is the higher; and the use of an apparatus comprising a first adsorbent and a second adsorbent as defined above for the reduction of the levels of water, carbon dioxide and nitrogen in a feed air stream wherein the adsorbents are regenerated as set out above.
摘要:
A dehumidifier configured for alternately cycling between a first operating configuration and a second operating configuration. The dehumidifier comprises a first desiccant bed configured for performing adsorption in the first operating configuration and for performing desorption in the second operating configuration; and a second desiccant bed configured for performing desorption in the first operating configuration and for performing adsorption in the second operating configuration.
摘要:
A portable oxygen concentrator system weighing 4-20 pounds adapted to be readily transported by a user and for delivering oxygen to lungs of the user includes a rechargeable energy source; a concentrator powered by said energy source and adapted to convert ambient air into concentrated oxygen gas for said user; and a control unit that controls the concentrator to deliver a flow rate based on at least one of a Body Temperature Pressure Dry (BTPD) condition, a Body Temperature Pressure Saturated with water (BTPS) condition, and a condition between BTPD and BTPS, where relative humidity is 0-100%, to maintain a constant fraction of inspired oxygen (FI02) in the lungs of the user.
摘要:
Disclosed are a pressure swing adsorption apparatus for hydrogen purification and a hydrogen purification method using the same. The pressure swing adsorption apparatus for hydrogen purification includes a plurality of adsorption columns connected with a feed supply pipe, a hydrogen storage tank for collecting purified hydrogen from the adsorption columns, and valves for opening or closing a plurality of pipes connected to the respective adsorption columns, and the adsorption columns are packed with adsorbent beds of active alumina or silica gel, activated carbon, zeolite 13X, zeolite 5 A, and a carbon monoxide-selective adsorbent other than the zeolite 5A, in order to remove carbon dioxide, methane, and carbon monoxide from a hydrogen- containing gas mixture supplied through the feed supply pipe, and the content of carbon monoxide in the discharged hydrogen is minimized through sequential adsorption on the adsorbents in the adsorption columns. The content of carbon monoxide in the purified hydrogen product can be decreased to 10 ppm or less, thus facilitating the production of highly pure hydrogen products.
摘要:
Process for purifying one supply gas stream and one secondary feed comprising one gas stream coming from a secondary gas line, by CPSA, comprising at least two adsorbers, each adsorber following, in an offset manner, a pressure cycle comprising a gas production phase and a regeneration phase, a purified gas enriched with the principal constituent being produced at the distribution pressure P1 during the production phase, said process being characterized in that the regeneration phase comprises at least a first countercurrent decompression step and a first elution step followed by a second countercurrent decompression step and a second elution step, making it possible, during the first elution step, to remove, without recompression, a waste gas at a distribution pressure P2, and makes it possible, during the second elution step, to remove, at a distribution pressure P3, where P1 > P2 > P3, a recycle gas recycled into the multifeed gas supply.
摘要:
Method of gaseous hydrogen purification from a gaseous mixture, said method comprising (a) a step purifying hydrogen from the permeate gas enriched with compressed hydrogen, by an adsorption method using pressure modulation (PSA) in which one or more adsorbers are used that each follow a cycle at intervals with an adsorption phase at the high cycle pressure, essentially equal to P3, and a regeneration phase, producing two regeneration flows: a first recycled regeneration flow and a second non-recycled regeneration flow, characterized by the fact that the recycled regeneration flow exiting the adsorber(s) in regeneration phase is returned, directly or indirectly, towards the compressor C of step (b), without intermediate compression so that a sole compressor C ensures both the compression of the hydrogen-enriched permeate from step (a) and compression of the recycled regeneration gas exiting step (c) for hydrogen purification by adsorption by pressure modulation (PSA).
摘要:
A hydrocarbon adsorption unit for recovery of volatile hydrocarbons which emanate from several sources and which would otherwise be released into the atmosphere through the air cleaner of an automobile engine when the engine is shut off. The unit is positioned in the air intake system such that all air flowing through the engine passes through the unit. The unit comprises a housing having an air inlet and an air outlet. The housing contains a substrate and a volatile hydrocarbon adsorber material coated on the surface of the substrate. The adsorber material may be silica gel, a molecular sieve and/or activated carbon. The material further contains a binder that will cause the material to adhere to the surface of the substrate.