Abstract: A biofilter for the removal of contaminants from gas streams disclosed. The biofilter makes use of a series of modular trays, each containing a gas-contacting medium for removing at least one contaminant from the process stream. The trays have a modular design that allows them to be sealingly stacked and to be configured to allow series, parallel or series-parallel flow through the biofilter.

Abstract: A container for a plurality of molecular sieve beds for use in a pressure swing oxygen concentrator. An extrusion defines at least two and preferably at least three passages extending between open ends of the extrusion. The extrusion ends are closed by first and second end caps secured to the extrusion. Two of the passages form separate molecular sieve containers and a third passage may form an accumulator for storing concentrated oxygen. In a preferred embodiment, the first end cap has separate inlet ports for each molecular sieve container and an outlet port for the accumulator. The second end cap has separate outlet ports for each molecular sieve container and an inlet port for the accumulator.

Abstract: Equipment samples and processes for analysis PAH and other organic compounds, as well as hydrogen fluoride and sulphur oxides in air and in gas in production equipment.The equipment comprises a layered adsorption device 1 in which the adsorbents are dry. During sampling, the adsorption device 1 is connected at its upper end to a probe 8, which is brought into contact with the object to be sampled, and connected at its lower end to a gel box 10, a pump 9 and a gas clock 12, in series. After sampling, the adsorption device 1 may be connected directly to an extraction apparatus 11 for the processing of the sample.

Abstract: An apparatus is provided which is capable of removing impurities from an impurity-containing hydrogen gas without generating methane. A bed of particulate nickel in an amount of at least 5% by weight as elemental nickel at a temperature of from 0.degree. C. to 50.degree. C. removes all impurities except nitrogen. Then a bed of getter material, a zirconium, vanadium and iron alloy at a temperature of from 200.degree. C. to 800.degree. C. removes the nitrogen impurity thus producing purified hydrogen with an impurity content of less than 20 ppb.

Abstract: A double cylinder shaped multilayer structural member comprising ring shaped thin plate small diameter discs and large diameter discs respectively layered via spacers is disposed in the enclosure vessel of a trap device for a vapor phase reaction apparatus. Gas from the intake opening section of the enclosure vessel is introduced into the outer side space of the multilayer structural member of the enclosure vessel, passes through the spaces between the large diameter discs and also passes through the spaces between the small diameter discs, then exits via the inner side space of the multilayer structural member from the outlet opening section of enclosure vessel to the system exterior. As a result of this construction, in comparison to conventional devices, the collection efficiency of reactive components can be increased, the equipment life extended, and maintenance frequency reduced, thereby providing a trap device for a vapor phase reaction apparatus capable of improving productivity.

Abstract: A biological air filter for cleaning, humidifying, and detoxifying air containing harmful substances, having a generally cylindrical filter housing with a sealing cover and a removable filter element. The filter element contains a substrate and plants. Air is circulated through the moist substrate and released into the room. Dust and harmful substances are trapped in the substrate and are at least partially consumed by the plants. The biological air filter can also be connected to an existing ventilating system. It is decorative and suitable for use in offices, apartments, laboratories, doctor offices, and the like.

Abstract: Processes and systems for purifying high purity helium group gas which may have been contaminated with water, oxygen and/or hydrogen during its transmission to customers' sites.

Abstract: A process and system for pressurizing a vessel for integrity testing with gas comprising helium, recovering the gas comprising helium, and purifying the gas comprising helium for reuse. The process for purifying the gas stream comprising helium comprises drying the gas stream; separating the dried gas stream in a membrane separator stage into a helium-enriched permeate product stream and a helium-depleted raffinate stream; recovering helium in the raffinate stream in a membrane stripper stage thereby producing a purge stream; and purging water from the dryer with the purge stream.

Abstract: Method and apparatus for separating one or more agents, specially solvents, from gases. The agent or the agents are adsorbed by an adsorbent and thereafter desorbed and separated in a condenser (18). The regeneration of the adsorbent includes two steps. In the first step the agent or the agents are separated from a part of the adsorbent by heating. In this way the concentration of the agent or the agents is increased in those parts of the adsorbent which are closest to the condenser. In a second step the remaining parts of the adsorbent are regenerated.

Abstract: Converted-halide photographic emulsions and elements are disclosed containing composite silver halide crystals. The composite crystals are comprised of multifaceted, radiation-sensitive silver iodide crystals. Silver halide crystals at least partially converted from silver chloride to silver bromide form epitaxial junctions with the silver iodide crystals. At least half of the facets of the silver iodide crystals are substantially free of epitaxial silver chloride, and the converted silver halide crystals are limited to less than 75 mole percent, based on the total silver halide forming the composite crystals.

Abstract: A photographic element is disclosed comprised of a support and, coated on the support, at least one radiation-sensitive layer. The radiation-sensitive layer contains silver halide grains including a spectral sensitizer adsorbed on the surface thereof and, intimately admixed therewith, silver halide grains free of surface spectral sensitization and having a particle size in the range of 0.15 to 0.8 micron in diameter. The photographic element exhibits improved speed without a concurrent increase in graininess.