Abstract: A method for collecting volatile organic substances from off-gas containing moisture and volatile organic substances. After the moisture has been removed by a dehumidifying tower filled with moisture absorbent for selectively adsorbing the moisture from the gas containing the organic substances and the moisture, the organic substances are adsorbed and removed under a relatively low temperature condition. The organic substances is desorbed under a relatively high temperature condition from the adsorbing tower which is saturated with the organic substances. The desorbed organic substances are liquefied and collected under a low temperature and/or pressurizing condition. The dry gas from which the organic substances have been removed and made harmless is heated if necessary.

Abstract: A regenerative desiccant air dryer system. Dry air is alternately drawn from approximately the center of two desiccant housings which are open at the top and bottom. A reclamation assembly directs dry air into the housing being purged to assist in the purging of moisture from the desiccant, and subsequently cooling the desiccant. The system is portable and operated by a programmable controller.

Abstract: An improved method and apparatus for removing moisture from compressed air through a pre-compression adsorptive desiccant bed, heat reactivated and regenerative air drying and filtration system. This system consists of an air filter affixed to a blower and in communication with a heater connected and communicating with a conduit communicating with a first valve and a second valve. The first and second valve are each connected to another conduit which is connected to a desiccant bed adsorption unit and another valve and conduit which is in communication with an air compression machine. Each desiccant bed is preferably of tubular configuration.

Abstract: A process and system for removing contaminants from air comprises flowing a compressed air stream comprising water and carbon dioxide to a first adsorbent zone for contacting with a first adsorbent effective in the adsorption of water by flowing the air in a direction within the first adsorbent zone parallel with the axis of the first adsorbent zone to form a dry gas; flowing the dry gas from the first vessel to a second adsorbent zone comprising a second adsorbent disposed in a radial arrangement about the same axis to remove carbon dioxide. Regeneration of the adsorbent beds may be carried out independently.

Abstract: Carbon dioxide is removed from a gas stream by passing the gas stream through a bed of natural or synthetic clinoptilolite or their chemically-modified derivatives. The process is particularly advantageous when applied to the removal of ppm levels of carbon dioxide from gas streams at temperatures above 20.degree. C.

Abstract: An improved regenerative gas drying system (30) having an adsorbing chamber (36) and a regenerating chamber (46) with both chambers containing desiccant (38) in which the adsorbing chamber (36) receives wet gas (31) for adsorption of moisture by the desiccant (38) contained therein to create a drier gas (40) and in which a portion of the drier gas (40) exits the adsorbing chamber (36) and is directed and carried to the regenerating chamber (46) to dry the desiccant (38) contained within the regenerating chamber (46).

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 process and apparatus for the selective recovery of solvents from solvent gas mixtures according to which the solvent gas mixture undergoes a sorption process, individual solvent gas fractions are fractionally desorbed from the sorption agent, condensed at staggered time intervals, measured to determine their composition, and collected separately.

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: A system for controlling the atmosphere of a container for use in the storage and/or transportation of perishable goods which includes adsorption apparatus for the selective adsorption in whole or in part and in a predeterminded order of any water vapor, carbon dioxide, oxygen or ethylene contained within the atmosphere, a blower for urging the atmosphere to the adsorption apparatus, and a conduiting for returning the controlled atmosphere to the container.

Abstract: In processes for removing mercury vapor from natural gas streams by selective adsorption in fixed adsorbent beds, water is invariably adsorbed along with the mercury impurity. During the periodic purge regeneration of the adsorbent bed it is desirable to recover as much as possible of the desorbed mercury in the spent regeneration gas in liquid form to avoid reintroducing the mercury into the environment. Cooling this spent regeneration gas under the high pressure conditions involved to condense the mercury can result in the highly undesirable formation of hydrocarbon hydrates if temperatures low enough to condense an adequate amount of mercury are employed. In the process of the present invention, the spent regeneration gas stream, from which some mercury has been removed by cooling, is further treated in a desiccant bed so that it is possible to cool it further in order to condense and remove additional mercury without encountering hydrocarbon hydrate formation.

Abstract: An apparatus and method for conditioning air in deep, underground mines. The apparatus includes an air passageway connecting an air inlet for ambient air and an air outlet for conveying dried air to the mine's working level. The air passageway provides for dehumidification of the air by passing it through activated adsorbent particles, preferably zeolite, and for reactivating the particles by reverse heating cycles, or revolving the adsorbent beds through separate air flows, one for dehumidification of the air, and the other for regeneration of the adsorbent particles. The dehumidification unit contained within the air passageway is sufficiently efficient to reduce the moisture content of the air to less than 0.001 kilograms of water per kilogram of air. A humidifier at the mines's working level receives the dried air at an increased pressure and temperature due to the mine's depth, and by evaporative cooling reduces the air temperature so that it is cooled to 25.degree. C. dry bulb/20.degree. C.