Abstract: The invention comprises a PSA apparatus for the separation of a heavy component from a light component in a feed stream. The apparatus includes an adsorbent bed comprising either a mixture of adsorbents or composite adsorbent particles wherein each particle comprises two or more adsorbents. At least one of the adsorbents is comparatively weak and the other is comparatively strong. Another embodiment of the invention is a PSA prepurifier having a bed of adsorbent material which comprises a mixture of, or composite adsorbent particles wherein each particle comprises at least two adsorbents, at least one of the adsorbents being comparatively strong and at least another of the adsorbents being comparatively weak.

Abstract: A PSA process involving the storage of products of various purities in segregated storage tanks for subsequent usage is disclosed. Products of increasing purities, admitted at the product end of the bed, are used during purging and repressurization steps. In addition, different composition streams collected at the feed end of the bed during the countercurrent depressurization step are admitted at the feed end of the bed, in the order of increasing product component content, during the rising pressure step(s). This cycle gives higher recovery and lower bed size factor than prior art PSA cycles.

Abstract: A system for controlling the atmosphere in the container comprising a membrane separation apparatus to separate nitrogen and a second separation apparatus, adapted to separate carbon dioxide and water vapor from a gas mixture in the container. The separated nitrogen is returned to the container, as is at least a portion of the carbon dioxide and water vapor, so as to produce and/or maintain a pre-determined atmosphere composition within the container thereby to prevent spoilage of perishable products within the container.

Abstract: A gas phase adsorption process in which a gas phase containing water vapor or a basic gas is brought into contact with activated carbon fiber to adsorb the water vapor or basic gas. The activated carbon fiber comprises pitch-based oxidized activated carbon fiber having oxygen-containing functional groups and an oxygen content of 3-18% by weight, based on the weight of the fiber. The oxidized activated carbon fiber is prepared by oxidizing pitch-based activated carbon fiber having a specific surface area of 200-2500 m.sup.2 /g.

Abstract: A thermodynamic pressure swing adsorption cycle utilizing "loudspeaker" diaphragms or pistons which are located at the top and bottom of a column containing a bed of adsorbent. The diaphragms are vibrated out of phase with each other so as to provide a displacement wave in the gas mixture within the bed of adsorbent. In addition to this displacement wave the gas is compressed prior to upward displacement and the gas pressure is lowered before the downward displacement by way of a second set of "loudspeakers" which form the side walls of the column. The second set of loudspeakers vibrate in phase with each other and operate at the same frequency as the displacement speakers.

Abstract: Substantially all of the carbon dioxide is removed from a gas containing up to about 1% by volume carbon dioxide by subjecting the gas to a pressure swing adsorption process using as the adsorbent a single layer of zeolite having a silicon to aluminum atomic ratio in the range of 1.5 to 70. The process is particularly suitable for removing substantially all carbon dioxide and water vapor contained in air prior to subjecting the air to cryogenic distillation.

Abstract: A process for producing at least an oxygen product gas stream, and power from a gas turbine, by compressing a feed gas stream containing elemental oxygen and heating the feed gas stream on the retentate side of an ion transport reactor membrane section to produce a heated feed gas stream. Oxygen permeating the ion transport reactor membrane section is reacted with a first fuel gas stream to produce a first combustion products gas stream. The heated feed gas stream is separated using an ion transport separator membrane section having a retentate side and a permeate side into an oxygen-depleted gas stream on the retentate side and an oxygen-containing gas stream on the permeate side. At least a portion of the first combustion products gas stream can be recovered, and energy is extracted from at least one gas stream to be expanded in a gas turbine to produce energy.

Abstract: A process train for treating a gas stream containing methane, nitrogen, and at least one of water vapor, acid gas, C.sub.3+ hydrocarbons and aromatic hydrocarbons, the gas stream typically, but not necessarily, being natural gas. The treatment train includes separation of methane from nitrogen by means of membranes that preferentially permeate methane and reject nitrogen. Preferred processes include both a dehydration step and an NGL removal step to treat the gas before it passes to the methane/nitrogen membrane separation step. The process train can also include additional steps, such as an acid gas removal step, or a cryogenic methane/nitrogen separation step.

Abstract: An adsorbent and method for removing water from gaseous HCl. MgCl.sub.2 supported on an activated carbon or silica gel substrate activated by heating to a temperature between 150.degree. C. (302.degree. F.) and 300.degree. C. (572.degree. F.) under vacuum will remove water at partial pressures of below 0.5 torr. Activation of the MgCl.sub.2 supported adsorbent can also be effected by heating the adsorbent between 270.degree. C. (518.degree. F.) and 400.degree. C. (752.degree. F.) under nitrogen.

Abstract: A process for producing a pressurized oxygen stream by compressing and heating a feed gas stream containing elemental oxygen, and separating the heated feed gas stream using an ion transport module into an oxygen-depleted gas stream on the retentate side and an oxygen-containing gas stream on a permeate side. The permeate side of the ion transport membrane is purged using a gas stream containing steam to produce a pressurized gas stream containing oxygen and steam, and the gas stream is separated into the pressurized oxygen stream saturated with water vapor and a residual water stream.

Abstract: A method for cleaning and recycling protective atmosphere for a float glass facility wherein contaminated protective atmosphere is cooled, preferably while scrubbing out particulates, compressed, and then purified by passage through a bed comprising water selective and hydrogen sulfide selective adsorbents.

Abstract: A process for the separation of a gas mixture containing oxygen and nitrogen, including bringing the mixture into contact in an adsorption zone with a first selective adsorbent for nitrogen of faujasite type exchanged to at least 80% with lithium, in which the Si/Al ratio is lower than 1.5 and a second selective adsorbent for nitrogen of zeolite type exchanged with divalent cations such as the alkaline-earth metal or transition metal cations. The second adsorbent is characterized by a nitrogen adsorptivity C.sub.2 lower than the nitrogen adsorptivity C.sub.1 characterizing the first adsorbent, and an adsorption selectivity for nitrogen in relation to oxygen (1.times.10.sup.5 Pa, 20.degree. C.) higher than or equal to 3.

Abstract: A process and apparatus for the removal of water from corrosive halogen gases, particularly chlorine- or bromine-containing gases, down to .ltoreq.100 ppb water concentration are described. The critical component is a high silica zeolite, preferably high silica mordenite, which in a variety of physical forms is capable of dehydrating such gases to .ltoreq.100 ppb or .ltoreq.50 ppb without being detrimentally affected by the corrosive nature of the gases in the presence of water. The high silica zeolite is produced by the removal of alumina from a natural or synthetic zeolite while retaining the desirable zeolite structure, to a silica:alumina ratio of from 20-2000:1. Metal cations which may be depleted by the alumina removal may be replaced by solution impregnation. Halogen- or halide-containing gases, or those with equivalent corrosion properties, may be dehydrated without deterioration of the high silica zeolite.

Abstract: In the pressure swing adsorption of nitrogen from gas mixtures with less polar gas components at temperatures of between 20.degree. and 50.degree. C., wherein the gas mixture is passed through an adsorber which is filled with packings of zeolite pellets and has an inlet zone and an outlet zone, the improvement which comprises providing at least two packings in the adsorber, a packing of Li-zeolite X in the inlet zone of the adsorber and a packing of at least one of Ca-zeolite A and Ca-zeolite X in the outlet zone of the adsorber.

Abstract: This process carries out a cycle on a monoadsorber (1) connected, on the one hand, to at least one container (2, 3) via a line (8, 10) fitted with a variable-opening valve (9, 11) and, on the other hand, to a reversible compression/pumping machine coupled to a speed variator (5). Application in particular to the production of oxygen at a variable flow rate from atmospheric air.

Abstract: In a method for recovering and/or purifying water which is absorbed from a humid atmosphere, the moisture from the air is adsorbed on a suitable medium (3) in a defined space, whereupon by the application of heat the moisture is brought to a condenser (1) where it passes into a liquid state (10) and is collected in a suitable manner. In order to improve the efficiency of this method the defined, sealed space is opened for the adsorbing medium (3), for free access to air at night-time and is closed during the hot day-time period. Condensed water is passed out through a collecting funnel (2) and a channel (5) to a collection container (6). A device is also described in the form of a housing with walls (7) which can be opened and closed, in which there is located an adsorbing medium (3). In the upper part of the housing there is provided a condenser (1). The condenser (1) is equipped with a drop collector (2) which is connected to an outlet pipe (5) to a collection container (6).

Abstract: The gas stream which is produced in and emanates from landfills, anaerobic digesters and other waste gas streams, is treated to produce a purified gas which is essentially a hydrocarbon such as methane and which can be used as the fuel source in a fuel cell power plant. The gas stream passes through a simplified purification system which removes essentially all of the sulfur compounds, hydrogen sulfide, and halogen compounds from the gas stream. The resultant gas stream can be used to power a fuel cell power plant which produces electricity, or as a hydrocarbon fuel gas for other applications.

Abstract: Solid gas-drying forms are made by heating drying salts with a polar solvent to form a saturated solution, then cooling, freezing and forming. Preferred salts are combinations of calcium and lithium bromides and chlorides in particularly effective molar ratios.

Abstract: Particulate adsorbents composed of inorganic oxides impregnated with an indicator dye selected from the group consisting of phenolphthalein, cresol red and thymol blue; a method for the production thereof, and a method for adsorptive drying of neutral gases using the aforementioned particulate adsorbents, whereby the degree of water absorption by the adsorbent particles is indicated by a reversible color change.

Abstract: Apparatus for drying flowing gas includes a generally cylindrical vessel having a gas inlet and a gas outlet, two perforated plates of different metals in contact with each other transverse the interior of the vessel, and a third perforated plate downstream from the two mutually contacting plates.

Abstract: Described is a process for the simultaneous sorption of water and organic compounds from gases selected from the group comprising natural gas and process gases (e.g. waste gases of maleic acid or terephthalic acid (anhydride) production or phthalic acid anhydride production or of steam reforming). The gas to be treated is contacted with a sorbent comprising particulate activated carbon in an oxidic carrier on a basis of silicon dioxide, aluminum oxide, aluminum phosphate or aluminosilicate. When natural gas is treated, water and C5+ hydrocarbons, for example, can be separated simultaneously. In steam reforming, with appropriate process management, C2+ hydrocarbons, CO.sub.2 and water can be absorbed simultaneously.

Abstract: A desiccant cartridge including a molded plastic shell having an outer cylindrical portion and an inner tubular portion connected by a plurality of ribs which extend therebetween, a molded plastic end cover grid secured in each of the opposite ends of the molded plastic shell and being attached to both the outer cylindrical portion and the inner tubular portion, annular porous felt members secured to the inner sides of the molded plastic end cover grids, and desiccant in the annular space between the outer cylindrical portion of the shell and the inner tubular portion thereof.

Abstract: The equipment, for example of the PSA type, comprises gas circulation elements for passing the gas horizontally through an adsorbent (3), which comprise, on at least one vertical side of the adsorbent, a gas distribution volume comprising a first subvolume (5; 9) adjacent to the adsorbent, and a second subvolume (6; 10) separated from the first subvolume by a wall provided with passages (40) having cross-sections and/or a distribution which are selected so as to reduce the variations in local flow rate along the adsorbent. The equipment is particularly useful in separating gases from air.

Abstract: A pressure swing process for air separation to produce concentrated gaseous oxygen at an elevated pressure without the requirement of further compression of the gaseous oxygen product. The process comprises the steps of compressing the feed air to a pressure in the range of approximately 45 psig to 105 psig, preheating the feed air to each of the adsorption beds to a temperature in the range of approximately 100.degree. F. to 200.degree. F., then directing flow of the feed air cyclically into and through at least two crystalline zeolite molecular sieve adsorption beds for selectively adsorbing at least nitrogen therein. In this manner, oxygen having a purity of approximately 88% to 93% at a recovery of approximately 30% to 45% and a bed size factor in the range of 2,500 pounds to 4,000 pounds of adsorbent per ton per day of oxygen can be delivered to a receptor tank at an elevated pressure of approximately 40 psig to 100 psig.

Abstract: A fluid-collecting device for collecting fluid from a fuel tank having an opening leading to the inside thereof including an elongated bag which is of a size which can pass through the opening, desiccant material in the bag, an elongated cord sewn to the top of the bag, and a disc to which the outer end of the cord is attached, the disc being of a larger size than the opening so that it cannot enter the opening, to thereby provide access to the outer end of the cord which can be grasped to withdraw the bag of desiccant material from the tank.

Abstract: A method for preparing a stable colloid in water in which water is enriched with respect to para water by condensing water vapor on a surface which does not decompose water into H and OH, dispersing a water insoluble material in colloidal form therein, whereby excess parawater acts as a stabilizer for the colloid, and storing the colloid in a vessel having a wall which does not decompose water into H and OH. The stability of the colloidal can be later broken by contacting it with a surface that decomposes water into H and OH.

Abstract: A vacuum swing adsorption process for separating a feed gas mixture into a more strongly adsorbable component and a less strongly adsorbable component in a process employing two vacuum pumps and three adsorbent beds containing an adsorbent selective for the more strongly adsorbable component using countercurrent depressurization and cocurrent ambient feed repressurization simultaneous with product end to product end pressure equalization and a common-shaft machinery arrangement which allows the expansion energy contained in the countercurrent depressurization and cocurrent ambient feed repressurization streams to be recovered and utilized to reduce overall process power consumption. Addition of three valves and an expander element will also allow expansion energy in the product purge and pressure equalization streams to be recovered. Oxygen product can be recovered from air at low cost using the process.

Abstract: In a pressure swing adsorption plant for the production of oxygen enriched gas a pressure vessel contains a first bed of molecular sieve adsorbent located adjacent an outlet 4 of the vessel which has an optimum operating efficiency at approximately ambient temperature and a second bed 10 of molecular sieve adsorbent which has an optimum efficiency below that of ambient operating temperature located adjacent the inlet 2.

Abstract: The invention relates to a process for separating out hydrogen chloride from a gas mixture forming in the chlorination of methane, which gas mixture contains unreacted methane, its chlorination products and hydrogen chloride formed in the reaction, by cooling and compression of the gas mixture and subsequent scrubbing with a scrubbing liquid which comprises at least one liquid chlorination product of methane. The gas mixture is separated into a methane-containing gas phase and a liquid phase containing hydrogen chloride and methane chlorination products, and the hydrogen chloride is then desorbed from the liquid phase by heating.

Abstract: A regenerative hygroscopic filter having a housing containing an inlet port and an outlet port, and, a hydrophilic filter element positioned within the housing and disposed between the inlet and outlet ports, and operatively arranged to filter solid particulate matter and water when gas passes into the inlet port and through the filter element, and to release water via the inlet port when gas passes from the outlet port through the filter element.

Abstract: A refrigerant recycling system (10) has a compressor (12) and identical first and second drier/separators (18, 20). Refrigerant material to be reclaimed is drawn into an inlet (22) of the first drier/separator, in which lubricant is separated from refrigerant vapor. After the lubricant is removed, the refrigerant vapor is filtered as it passes through a screen (80), a bed of molecular sieve material (82), and a fibrous pad (84). After passing through the first drier/separator, the refrigerant enters the compressor in which clean lubricant material is introduced to enable the compressor to operate effectively. From the compressor, the refrigerant vapor and clean lubricant passes through the second drier/separator wherein the clean lubricant is removed and the refrigerant vapor is again filtered. The twice filtered vapor is then passed to a condenser (44) in which it is condensed to a liquid. The clean refrigerant liquid is delivered from the reclamation system cleansed of impurities.

Abstract: A membrane process for separating chlorine from chlorine-containing gas streams is disclosed. The process employs a permselective membrane that is selective to chlorine and is stable in the long-term presence of chlorine. The process can be used to treat tail-gas from chlor-alkali plants, for example.

Abstract: The purge and trap procedure commonly used for analysis of volatile organic compounds in water or air can be significantly improved using traps employing molecular sieves as adsorbents. Silicalite and potassium-exchanged dealuminated zeolite Y form an effective mixture.

Abstract: In a pressure-swing adsorption-type gas separation unit, a distinct intermediate gas passageway is formed between a first water retaining bed (A) and a second separating adsorbent bed (B), a controlled heat flow being supplied to prevent the formation of a very cold area between both beds. The unit is particularly useful in the production of oxygen from air.

Abstract: There is diclosed a process for purifying hydrogen gas which comprises removing impurities such as nitrogen, oxygen, methane, carbon monoxide, carbon dioxide and moisture contained in a crude hydrogen gas by bringing the crude hydrogen gas into contact under heating with a hydride of a zirconium alloy such as Zr-V, Zr-V-Ni, Zr-V-Cr, Zr-V-Co, Zr-V-Fe, Zr-V-Cu, Zr-V-Ni-Cr, Zr-V-Ni-Co and Zr-V-Cr-Fe. By virtue of using the above Zr alloy hydride, the process enables highly advanced purification of crude hydrogen gas by removing such impurities as above to a level as low as 1 ppb or less in high safety and efficiency at low installation and running costs.

Abstract: A process is set forth for purifying and liquefying a feed gas mixture with respect to its less strongly adsorbed component of lower volatility which integrates temperature swing adsorption (TSA), pressure swing adsorption (PSA) and cryogenic distillation to optimize overall performance. The TSA portion of the process is used to remove the strongly adsorbed component from the feed; the PSA portion of the process is used to remove the moderately strongly adsorbed component from the feed; and the cryogenic distillation portion of the process is used to remove the less strongly adsorbed component of higher volatility from the feed while also providing for the liquefaction of the product. A key to the present invention is the use of the PSA and distillation waste streams in the regeneration of the TSA and PSA adsorbents. An important application of the present invention is the purification and liquefaction of a natural gas feed stream with respect to its methane/C.sub.2 hydrocarbon component.

Abstract: Particulate adsorbents composed of inorganic oxides impregnated with an indicator dye selected from the group consisting of phenolphthalein, cresol red and thymol blue; a method for the production thereof, and a method for adsorptive drying of neutral gases using the aforementioned particulate adsorbents, whereby the degree of water absorption by the adsorbent particles is indicated by a reversible color change.

Abstract: The present invention discloses an improved method of producing a low-cost, nitrogen-based inert atmosphere suitable for radiation curing of resins, coatings, etc. from non-cryogenically generated nitrogen. According to the disclosed method, residual oxygen present in non-cryogenically generated nitrogen is converted to either moisture or a mixture of moisture and carbon dioxide by reaction with a reducing gas in a catalytic reactor prior to using the nitrogen-based atmosphere for radiation curing of moisture insensitive materials such as resins and coatings.

Abstract: Carbon dioxide sorption using a metal oxide-alkali metal carbonate sorbent typically requires a relative humidity of greater than 25% in order to obtain reaction rate constants of about 2.0 to 3.0 sec..sup.1 (see Equation 6). The incorporation of alkali halide salt into the metal oxide-alkali metal carbonate sorbent maintains rate constants of about 2.0 to about 4.0 sec..sup.1 at relative humidities below 25%. Therefore, the hygroscopic alkali halide salt attracts water, thereby providing the necessary hydroxide ions for enhanced absorption at low relative humidities.

Abstract: A process for supplying nitrogen to at least two user stations, whose requirements as to nitrogen purity are different. Compressed air is passed from an air compressor (12) to at least one air treatment station (13) permitting effecting at least one of the following treatments of oil removal, filtering out a major portion of the particles, drying, and bringing the air to the desired temperature. The compressed air is then sent to a centralized gas separation unit (14), so as to produce at the outlet of the unit impure nitrogen of intermediate purity. The gas from the centralized separation unit (14) is directed to at least two utilization lines (3-5), each comprising a local gas separation unit (6-8), in which the gas is again treated, so as to obtain at the outlet of each local separation unit nitrogen of a purity suitable for the uses of each of the user stations (9, 10) at the end of the line.

Abstract: Crystals of the Zeolite Analcime (Analcite) Na.sub.2 O.Al.sub.2 O.sub.3.4SiO.sub.2.2H.sub.2 O are provided having a largest dimension greater than 50 micron. A method for preparing such crystals by mixing aqueous solutions of aluminium sulphate and sodium metasilicate, allowing a gel to form then heating, is provided. The presence of an organic water-miscible base encourages an increased crystal size. The crystals retain water strongly and a use for them in long term immobilisation of tritiated waste water is provided.

Abstract: The gas stream which emanates from landfills is treated to produce a purified gas which is essentially a hydrocarbon such as methane which can be used as the fuel source in a fuel cell power plant, or can be used in other power plants which use natural gas as a fuel. The landfill gas passes through a system which removes essentially all of the hydrogen sulfide; water; organic sulfur and halogen compounds; and solid contaminants from the gas stream. The resultant purified gas stream can be cleanly flared; used to power an energy plant; or put to other useful purposes.

Abstract: A separation of gas by permeation, comprising the steps of and the apparatus for compressing a gaseous mixture to be separated at a first temperature (Ta) in a compressor (2), cooling to a second temperature (To) the compressed mixture to condense condensable impurities in the compressed gaseous mixture, purifying the compressed gaseous mixture of condensable and/or adsorbable impurities at a third temperature (T.sub.1) greater than the second temperature (T.sub.0) and passing the purified gaseous mixture into a gaseous permeation unit comprising at least one membrane module to obtain at least one production gas. The third temperature (T.sub.1) is so regulated that it will not be less than a first predetermined value. The second temperature (To) is greater than the first temperature (Ta) by a value comprised between 1.degree. and 5.degree. C., the first value being not less than 20.degree. C.

Abstract: Desiccant-coated substrates, regeneratable rotary dehumidification wheels and other devices for gas (e.g., air) treatment using those substrates, and processes for making them are disclosed. The substrates may have coatings in thicknesses of from about 2 to about 10 mils containing particles of one or more adsorbent desiccants and an organic water-based binder. The desiccant particles retain a high fraction of their original adsorption capacity because the pores of the desiccant particles contain a pore-clearing agent prior to the binder setting and the pore-clearing agent leaves the pores during the manufacturing process to prevent the binder from blocking the pores. In preferred embodiments a mixture of different desiccants is used and a particle suspending agent keeps the particles well-mixed so that the desiccant particles in the coated substrate will be as well-mixed as possible. The suspending agent may also function as the pore-clearing agent.

Abstract: A two stage pressure swing adsorption process is set forth for producing high purity oxygen from a feed air stream wherein carbon dioxide, water and preferably nitrogen are removed in the first stage and wherein an oxygen selective adsorbent is used to adsorb oxygen in the second stage. The oxygen product is recovered upon depressurization of the second stage. The high purity of the oxygen product is achieved by rinsing the oxygen selective adsorbent with oxygen prior to the depressurization step. A key to the present invention is that the effluent streams from the second stage feed and rinse steps are used to regenerate the first stage adsorbent(s) in a specific regeneration scheme.

Abstract: The present invention relates to a controlled process for producing amorphous, microporous silica gels having a predetermined water sorption isotherm of moderate Type I shape having a separation factor between about 0.07 and 0.1 and micropore diameter size between about 6 and 8.7 angstroms. The present microporous silica gels are prepared by adjusting the pH of the reaction system or by doping the system with various elements during the hydrolysis and condensation of alkoxy silicates to form silica gels therefrom, and the hydrolyzed products are successively polymerized to form polymers and particles containing siloxane bonds as follows: ##STR1## Various factors, for example open vs closed system, amount of water used for hydrolysis, type of alkoxides and solvent, pH, amount of catalyst, temperature, aging and drying conditions etc., affect the nature and the rate of hydrolysis, condensation reactions and network formation, and consequently the properties of the final gel products.

Abstract: An apparatus and process is provided for the production of hot mix asphalt (HMA) by the treatment of virgin material alone or adding reclaimed or recycled asphalt pavement (RAP) of up to 100% of the HMA comprised of reclaimed asphaltic pavement (RAP). The HMA is first heated in either a parallel or a counter flow rotating drum which is supplied with hot combustion gases generated by a remote low NO.sub.x burner. The temperature of hot gases entering the drum is from about 400.degree. to 2,000.degree. F., and the temperature of gases exiting from the drum is from about 130.degree. to 220.degree. F. The HMA material optionally can be subjected to microwave radiation to raise the material to a final temperature, or optionally to only reorient the dipolar molecules of the material without any measurable heating of the material. The exhaust gas is treated and made environmentally safe.

Abstract: A method and apparatus for drying a non-aqueous liquid electrolyte through the non-contact use of a desiccant includes a closed system having separate containers for the electrolyte and the desiccant. The closed system is charged with an inert gas, and a means is provided to circulate the gas between the containers. A stirring means is provided to stir the electrolyte to facilitate the release of water from the electrolyte.

Abstract: A desiccant composition having a moderate Langmuir Type 1 moisture adsorption isotherm with a separation factor of from 0.05 to 0.13 is disclosed. The composition contains silica gel, a modified 13.times. molecular sieve (modified by replacing at least 20% of the sodium cations with other metallic cations, e.g., potassium cations), and desirably a hydrophobic adsorbent (desirably a hydrophobic molecular sieve). The composition may be used as the desiccant in a rotary regeneratable dehumidification wheel, thereby significantly enhancing dehumidification performance and simultaneously removing a significant proportion of the airborne pollutants typically contained in indoor and outdoor air.

Abstract: A method and an apparatus for concentrating/purifying a chlorine gas are disclosed in which a pressure swing adsorption method for alternately repeating an adsorbing operation and a desorbing operation employing one or more adsorption towers packed with an adsorbent for adsorbing the chlorine gas are used to obtain a high-purity concentrated/purified chlorine gas and an exhaust gas containing virtually no chlorine gas is obtained from the chlorine gas containing impurities by terminating the adsorption operation when the rate of temperature rise near the outlet end of an adsorption tower due to adsorption of chlorine therein rises above a predetermined amount.