Abstract: A filter device for purifying air includes a filtering tank and a mixing rotor. The a filtering tank has a filter chamber for containing a predetermined volume of filtering solution to filter particles of the air and defining an upper air portion and a lower solution portion, an air inlet formed at the air portion for guiding the air to flow into the filter chamber and an air outlet. The mixing rotor is rotatably supported in the filtering tank, wherein the mixing rotor includes a rotor hub driven to be rotated within the filter chamber, and a plurality of air paddles radially extended from the rotor hub for striking towards the filtering solution at the solution portion of the filter chamber from the at the air portion thereof so as to substantially mix the air from the air inlet with the filtering solution.

Abstract: The present disclosure provides a method and apparatus for extracting carbon dioxide (CO2) from a fluid stream and for delivering that extracted CO2 to controlled environments for utilization by a secondary process. Various extraction and delivery methods are disclosed specific to certain secondary uses, included the attraction of CO2-sensitive insects, the ripening and preservation of produce, and the neutralization of brine.

Abstract: A method and apparatus for separating mercury and other undesired constituents from a natural gas stream includes passing the raw gas stream sequentially through a first separator, an amine treatment unit, a cooler, a second separator, a dehydrator, a cooler and a third separator. The first separator receives the natural gas stream and separates hydrocarbon and water condensates from the stream; the amine treatment unit removes acid gases; the cooler reduces the temperature of the gas stream to condense additional hydrocarbons and water that are removed by the second separator; and the dehydrator removes water vapor. Next, the temperature of the stream is reduced by the second cooler to condense the mercury and any remaining hydrocarbon vapors.

Abstract: A system for sequestering carbon emissions from a fuel combustor generally includes a combustion gas extraction module for extracting combustion gas from a fuel combustor and a greenhouse facility for receiving the extracted combustion gas and having at least one vegetation supporting soil bed for absorbing carbon dioxide from the received combustion gas. The extraction module includes a particulate removal unit for removing pollutants from the extracted combustion gas and a heat exchanger in downstream fluid communication with the particulate removal unit for cooling the extracted combustion gas.

Abstract: A method for treating a gas containing sulfur, the method comprising the steps of: introducing a gas into a headspace of a vessel; passing the gas through a filtration medium contained in the vessel, wherein the filtration medium comprises sulfur-oxidizing organisms, wherein the gas is passed through the filtration medium in a generally downward direction; and irrigating the filtration medium with an aqueous liquid, wherein the pH of the aqueous liquid is at least 5.

Abstract: In one aspect of the invention there is provided a gas scrubbing system for removing contaminants from a flow of fluid, comprising a container having an interior volume, an inlet for receiving the flow of fluid and an outlet for dispensing the stream of fluid, a treatment liquid, a porous medium positioned in the interior volume, between the inlet and outlet, said porous medium providing a high surface area to facilitate chemical interactions between the fluid flow and the treatment liquid and means to apply the treatment liquid onto the porous medium. A contact cell aspect of the porous medium and a method aspect are also provided.

Abstract: An apparatus is provided for removing airborne moisture from a designated area. In one embodiment, the apparatus includes a bucket, a liquid absorption medium (such as ground corn cobs) placed in the bottom of the bucket to form a media bed, a tray placed over the absorption media bed, and a moisture absorption medium (such as calcium chloride) placed in the bucket over the tray. A method is also provided for absorbing moisture from a humid environment using the apparatus. When the apparatus is exposed to humid conditions, the CaCl2 will absorb moisture and become hardened. As the CaCl2 media hardens, it will expand. However, its lateral expansion is restricted by a side wall of the tray. Over further time, the CaCl2 will begin to dissolve into a brine. The brine will gravitationally seep through the through-openings in the tray and be captured by the corn cob medium.

Abstract: One aspect of the invention relates to a method for removing contaminants from a flue gas stream (22). The method includes: removing fly ash from a flue gas stream (22) utilizing a particle collector (24); contacting the flue gas stream with an alkaline reagent in a wet scrubber (26); discharging a purge liquid (30) from the wet scrubber (26); combining at least a portion of the purge liquid (30) with at least a portion of the fly ash (48) to form moistened fly ash (60); and injecting at least a portion of the moistened fly ash (60) into the flue gas stream (22) upstream of the particle collector (24), whereby the moistened fly ash (60) removes at least a portion of contaminants present in the flue gas stream (22).

Abstract: An apparatus and a method for removing volatile organic compounds from air that is vented from tanks and vessels containing hydrocarbon material. This invention also relates to a self-propelled vehicle on which the apparatus is mounted.

Abstract: The present invention provides for a monolith reactor process for the production of syngas from hydrocarbon and oxygen feeds. The syngas is cooled and separated to produce carbon monoxide and hydrogen, and the purification equipment utilized in this separation process recycles tail gas and fuel gas to the syngas feed gas line and recycles methane from the carbon monoxide separation system for feed back to the monolith reactor. This process results in almost complete carbon to carbon monoxide conversion and very high carbon monoxide and hydrogen recoveries.

Abstract: An apparatus and process for removing regulated pollutants and other contaminants from a flowing gas stream between a scrubber and an exhaust stack. The apparatus comprises a vessel having a heater chamber, an adsorbent chamber and a filter chamber. The vessel inlet receives the gas stream from the scrubber and the vessel outlet discharges clean gas to the exhaust stack. A heater in the heater chamber heats the incoming gas stream to lower the relative humidity. The gas stream then passes through granular adsorbent material located in the adsorbent chamber to remove contaminants remaining after the wet scrubber. From the adsorbent chamber the gas stream flows into the filter chamber where filters remove entrained particulate matter prior to discharge to the exhaust stack. The process of the present invention includes the above-described steps.

Abstract: The direct contact liquid air contaminant control system and method to revitalize air by removal of carbon dioxide and other trace gas contaminants use a direct contact air, liquid scrubber element and stripper element. The scrubber element has two rotor elements rotatably mounted in a housing first for centrifugal separation of an air flow and liquid absorbent mixture which liquid absorbent has absorbed carbon dioxide and trace gas contaminants. Then second for centrifugal separation of an air flow and acid water wash mixture which acid water wash has liquid absorbent and other contaminants. The processed air is then passed through a charcoal bed filter for further removal of contaminants. A rotary contact processor may also be used to reprocess contaminated liquid absorbent for reuse.

Abstract: A pretreatment system for natural gas liquefaction employing heat integration for more efficient and effective natural gas temperature control. The pretreatment system expands the natural gas prior to acid gas removal. After acid gas removal, the natural gas is cooled by indirect heat exchange with the expanded natural gas located upstream of the acid gas removal system.

Abstract: The present invention provides a mercury removal method which can effectively remove very small amounts of mercury components present in a gas during wet gas purification such as coal or heavy oil gasification gas purification and petroleum refining. A mercury removal method for the removal of mercury present in a gas, the method comprising the steps of bringing a gas containing at least mercury and not less than 10 ppm of hydrogen sulfide into gas-liquid contact with an absorbing fluid under pressurized conditions so as to cause mercury to pass into the absorbing fluid; flashing the mercury-containing absorbing fluid under lower-pressure conditions to separate it into gaseous components and liquid components; and removing the mercury contained in the separated gaseous components by adsorption to an adsorbent.

Abstract: A channelized sorbent material comprises porous sorbent particles characterized by an average pore diameter. Each sorbent particle has at least one interior channel of an average transverse dimension (i.e. transverse diameter) that is at least ten times larger than the average pore diameter of the porous sorbent particle. The interior channel may constitute a single cylindrical through-bore in the sorbent particle, or alternatively, an array of intersecting or non-intersecting channels. The porous sorbent particles preferably comprise bead activated carbon particles. Such channelized sorbent material is particular useful as sorbent media in an adsorption-desorption apparatus for storage and dispensing of a sorbable fluid.

Abstract: A process for removing chlorine gas from the tail gas stream of a chlor/alkali plant or other chemical processes comprising the steps of: (a) contacting a chlorine-, hydrogen-, and carbon dioxide-containing tail gas stream with a zeolite molecular sieve having a molecular pore diameter greater than the molecular diameter of the carbon dioxide and hydrogen and smaller than the molecular diameter of chlorine so that at least a portion of the carbon dioxide is absorbed onto the molecular sieve, and thereby producing a purified tail gas stream that contains substantially all of the chlorine and hydrogen values and a reduced amount or no amount of carbon dioxide values; and (b) contacting the purified tail gas stream with an aqueous sodium hydroxide scrubbing solution in order to remove substantially all of the chlorine values from the purified tail gas stream, whereby producing a purified sodium hypochlorite solution that is substantially free of sodium carbonate.

Abstract: A system and process for industrial painting operations is disclosed. The disclosed system and process includes entraining paint particles from a paint booth operation in a stream of air; directing the stream of air to an aqueous bath covered with a layer of small silica particles; encapsulating the paint particles present in the stream of air with the small silica particles; further cleansing the stream of air by removing residual paint particles and other unwanted compounds as the stream of air is directed through an exhaust system; and recycling the encapsulated paint particles remaining in the paint booth.

Abstract: The raw syngas generated in a partial oxidation gasifier also includes carbon soot which is removed and recovered from the syngas by scrubbing with water. The scrubbing water contains one or more high temperature surfactants which allow greater soot concentrations in the water-scrubbing quench zone of the gasifier. The carbon soot is separated from the scrubbing water with the aid of a scrubbing oil. The separation of the carbon soot from the scrubbing water is enhanced with the aid of one or more surfactants that render the soot particles hydrophobic and oleophilic. The recovered carbon soot is ultimately recycled to the gasifier to recover the energy value of the carbon during the partial oxidation reaction. The overall energy efficiency of the gasification process can be increased by removing all or a significant portion of the water from the soot mixture before recycling the soot.

Abstract: A method and system for retrofitting an integrated scrubber to provide maximum oxygen content in a controlled decomposition oxidation (CDO) abatement process. The system includes a thermal/wet integrated scrubber, and a compressed air supply for supplying air to an oxygen separation device that separates the air into a nitrogen-enriched component and an oxygen-enriched component. The oxygen separation device utilizes a ceramic, metallic, carbonaceous or polymeric material to separate from the supplied air an oxygen-enriched component for introduction into the integrated scrubber. The integrated scrubber is equipped with a mechanical scraping device for continuous or intermittent removal of combustion deposits formed during the controlled decomposition oxidation process.

Abstract: A method and system for retrofitting an integrated scrubber to provide maximum oxygen content in a controlled decomposition oxidation (CDO) abatement process. The system includes a thermal/wet integrated scrubber, and a compressed air supply for supplying air to an oxygen separation device that separates the air into a nitrogen-enriched component and an oxygen-enriched component. The oxygen separation device utilizes a ceramic oxide or polymeric material to separate from the supplied air an oxygen-enriched component for introduction into the integrated scrubber. The integrated scrubber is equipped with a mechanical scraping device for continuous or intermittent removal of combustion deposits formed during the controlled decomposition oxidation process.

Abstract: A method and system for retrofitting an integrated scrubber to provide maximum oxygen content in a controlled decomposition oxidation (CDO) abatement process. The system includes a thermal/wet integrated scrubber, and a compressed air supply for supplying air to an oxygen separation device that separates the air into a nitrogen-enriched component and an oxygen-enriched component. The oxygen separation device utilizes a ceramic, metallic, carbonaceous or polymeric material to separate from the supplied air an oxygen-enriched component for introduction into the integrated scrubber. The integrated scrubber is equipped with a mechanical scraping device for continuous or intermittent removal of combustion deposits formed during the controlled decomposition oxidation process.

Abstract: A method and system for retrofitting an integrated scrubber to provide maximum oxygen content in a controlled decomposition oxidation (CDO) abatement process including a thermal/wet integrated scrubber, and a compressed air supply for supplying air to an oxygen separation device that separates the air into a nitrogen-enriched component and an oxygen-enriched component. The oxygen separation device includes a module, such as a vessel containing ceramic-materials arranged in an adsorbent bed or coated on a substrate. The present invention uses a ceramic oxide material through which only oxygen can diffuse. The composition of the ceramic oxide adsorbent material is such that a significant number of oxygen vacancies exist in the material. By placing either a voltage potential or a pressure gradient across the membrane, oxygen is selectively diffused in and through the oxide material to separate the air supply into an oxygen component for introduction into the integrated scrubber.

Abstract: A process is disclosed for the extraction, production and purification of carbon dioxide gas. The process may also be employed for the production of aqueous and/or organic solutions of bicarbonate ions using a precursor feed stream of gas containing carbon dioxide. The process consists of the countercurrent flushing of a packed tower-type bioreactor with gas containing carbon dioxide and a liquid solvent. The bioreactor contains carbonic anhydrase covalently bound to an inert inorganic support. The carbon dioxide of the gaseous phase diffuses into the liquid phase. The immobilized carbonic anhydrase catalyses the hydration of the carbon dioxide which forms hydrogen and bicarbonate ions. The solution of ions may be employed directly or, alternatively, subjected to an ion-exchange resin to immobilize the bicarbonate ions. The aqueous solution of hydrogen and bicarbonate ions may also be recirculated into a second identical bioreactor, wherein they are catalytically converted to water and carbon dioxide.

Abstract: A method and system for retrofitting an integrated scrubber to provide maximum oxygen content in a controlled decomposition oxidation (CDO) abatement process. The system includes a thermal/wet integrated scrubber, and a compressed air supply for supplying air to an oxygen separation device that separates the air into a nitrogen-enriched component and an oxygen-enriched component. The oxygen separation device utilizes a ceramic oxide or polymeric material to separate from the supplied air an oxygen-enriched component for introduction into the integrated scrubber. The integrated scrubber is equipped with a mechanical scraping device for continuous or intermittent removal of combustion deposits formed during the controlled decomposition oxidation process.

Abstract: Desiccant tablets including solid potassium formate are used to dry gas, especially in natural gas transmission lines. Preferred tablets comprise 1-4% potassium formate (most preferably 2-3%), up to 1% of a surfactant as a lubricant, and the balance desiccant salts, preferably calcium chloride.

Abstract: A method and system for retrofitting an integrated scrubber to provide maximum oxygen content in a controlled decomposition oxidation (CDO) abatement process comprising a thermal/wet integrated scrubber, and a compressed air supply for supplying air to an oxygen separation device that separates the air into a nitrogen-enriched component and an oxygen-enriched component. The oxygen separation device comprises a module, such as a vessel containing ceramic-materials arranged in an adsorbent bed or coated on a substrate. The present invention uses a ceramic oxide material through which only oxygen can diffuse. The composition of the ceramic oxide adsorbent material is such that a significant number of oxygen vacancies exist in the material. By placing either a voltage potential or a pressure gradient across the membrane, oxygen is selectively diffused in and through the oxide material to separate the air supply into an oxygen component for introduction into the integrated scrubber.

Abstract: Injection of even very small amounts of supplemental water to the spent-air stream at points upstream from the heat exchanger cooler(s) used in processing spent-air streams from a cumene-to-phenol process allows these heat exchanger coolers to act as both extractors and condensers. It is therefore possible to recover from the heat exchanger cooler a methanol/water condensate, thereby substantially reducing the amount of methanol in the spent-air stream prior to discharge. Thus, known methods for manufacture of phenol from cumene in which an oxygen-containing gas stream is passed through liquid cumene to produce an oxidate product and a spent-air stream comprising methanol and cumene and a saturating amount of water; and in which the spent-air stream is passed through one or more heat exchanger coolers and a carbon bed prior to discharge can be improved.

Abstract: Desiccant tablets including solid potassium formate are used to dry gas, especially in natural gas transmission lines. The most preferred tablets comprise 5-15% potassium formate, up to 1% of a surfactant as a lubricant, and the balance desiccant salts, preferably calcium chloride.

Abstract: The invention relates to a process for preparing a highly loaded adsorbent by extracting an oil from an oil crude product using supercritical fluid extraction to obtain a loaded supercritical fluid (SCF). The loaded SCF is expanded, followed by heating to obtain a liquid phase and an in-loading reduced SCF phase. Optionally, the pressure is decreased and/or the temperature of the SCF is raised to conditions of adsorption. The SCF is introduced into a fixed bed adsorber to obtain an adsorbent loaded with the purified oil and pure SCF. The liquid phase is fed as a reflux to the extraction device. The pure SCF is compressed and tempered to extraction conditions. The pure SCF is recycled to an extraction device. Also provided is a process for purifying an oil from an oil crude product by desorbing the adsorbed oil.

Abstract: Porous, preferably dimensionally stable material and a method for using for the removal of gaseous impurities from a gas mixture, such as H2S, COS, CH2, and SO2, into the pores of which there is incorporated a secondary amine which chemically bonds with the constituents to be removed, with the material including a hydrophobic polymer with pores having an average diameter in the range of from 0.1 to 50 &mgr;m and a secondary amine having hydrophobic properties which optionally is incorporated into a hydrophobic liquid is disclosed. Favorable results have been attained using polypropylene as the hydrophobic polymer and ditridecyl amine as the secondary amine, with a tertiary amine, such as C12 to C14-alkyl diethanol amine, being part of the hydrophobic liquid.

Abstract: The apparatus of the present invention for treating a gas containing a substance to be decomposed comprises adsorption means equipped with an adsorbent for adsorbing the substance to be decomposed, steam introduction means for bringing steam into contact with the adsorbent, condensation means for obtaining a condensed liquid containing the substance to be decomposed from the steam containing the substance, a reaction tank, condensed liquid supply means for supplying the condensed liquid to the reaction tank, hypochlorous acid supply means for supplying a solution containing hypochlorous acid to the reaction tank, and light irradiation means for irradiating the reaction tank with light.

Abstract: The invention is in an apparatus for the remediation of particulate material and gaseous pollutants from a flue gas flow that is simple and highly efficient in removing nearly all toxic pollutants, particularly sulfur dioxide, from a flue gas flow, and includes a manifold that is to receive and pass a polluted flue gas flow that mounts an injector that is fitted into the manifold wall to inject finely ground sorbent materials counter-current to the flue gas flow, creating turbulence and a thorough mixing to effect compaction and/or agglomerization of the pollutant and sorbent particles.

Abstract: This invention relates to a flue gas treating process including a heat recovery step for recovering heat from flue gas by means of a heat exchanger (4) and thereby cooling the flue gas, and a subsequent absorption step for bringing the flue gas into gas-liquid contact with an absorbing fluid (D) in absorption towers (12, 13) so as to remove at least SO2 present in the flue gas by absorption into the absorbing fluid (D), which is characterized, for example, in that a powder addition step for spraying a powder collectable in the absorption step into the flue gas is provided prior to the heat recovery step. This invention makes it possible to provide a flue gas treating process in which a countermeasure against SO3 present in flue gas can be easily achieved without resorting to ammonia injection and the flue gas can further be purified without the disadvantage of causing the injected substance to remain in the treated flue gas.

Abstract: A method and apparatus of cooling incinerator exhaust gas for a cleaning treatment of high temperature exhaust gas discharged from an incinerator of refuse and/or waste in a post-step are provided. A spray cooling chamber includes a chamber having a lower end portion formed into a nearly cylindrical shape of an inverted conical shape, a gas distribution chamber equipped with a revolving blade, arranged at an upstream side of the chamber, a sprayer of a cooling liquid arranged at central upper portion of the chamber, a dust exhaust port arranged at the lower end portion of the chamber, and an exhaust pipe arranged on the chamber. Waste heat recovery from exhaust gas is limited to a temperature range capable of suppressing generation of dioxins, and high temperature exhaust gas is rapidly cooled, particularly at a temperature drop rate such that the vicinity of 300.degree. C. is dropped in a short time within 1 second, so that exhaust concentration of dioxins from an incinerator plant can be decreased to 0.

Abstract: Process gases from microelectronic device fabrication processes are pumped through a filter unit including a plurality of absorbers for absorbing water entrained within the process gases. Residues deposited within the filtering unit are removed by spraying water on the absorbers. Water is prevented from escaping from the filtering unit into other portions of an exhaust gas system or into the environment by providing a curtain of pressurized, inert gas, within the filtering unit.

Abstract: The present invention provides compositions including a salt selected from the group consisting essentially of sodium nitrate, sodium nitrite, ammonium nitrate, lithium nitrate, barium nitrate, cerium nitrate, and mixtures thereof, as flue gas conditioning formulations for use in controlling particulates, hazardous substances, NO.sub.x, and SO.sub.x. For the purpose of obtaining greater yields of particulate and hazardous substance removal, the compositions may further include a polyhydroxy compound, preferably selected from the group consisting essentially of sucrose, fructose, glucose, glycerol, and mixtures thereof. Methods are also provided for adding these compositions to the flue gas stream to control particulate, hazardous substance, NO.sub.x, and SO.sub.x emissions.

Abstract: A method and system for processing waste dries and reforms a sludge stream of the waste with a first reformed effluent stream to produce a gas effluent stream and a solids effluent stream. The gas effluent stream is reformed further to produce the first effluent stream, which is then directed back to the sludge stream.

Abstract: Processes and systems to recover at least one perfluorocompound gas from a gas mixture are provided. In one embodiment the inventive process comprises providing a gas mixture comprising at least one perfluorocompound gas and at least one carrier gas, the gas mixture being at a predetermined pressure; providing at least one size selective membrane having a feed side and a permeate side; contacting the feed side of the at least one membrane with the gas mixture; withdrawing from the feed side of the membrane as a non-permeate stream at a pressure which is substantially equal to the predetermined pressure a concentrated gas mixture comprising essentially the at least one perfluorocompound gas; and withdrawing from the permeate side of the membrane as a permeate stream a depleted gas mixture comprising essentially the at least one carrier gas.

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: A method and a device for the removal of ethylene oxide gas present at high concentrations, for example, 1,000 to 1,000,000 ppm, in exhaust gas is described, which is especially suitable for exhaust gases of gas sterilization chambers. It is suggested to adsorb ethylene oxide from the exhaust gas with a dry adsorbing medium. In an alternative it is suggested to absorb and/or catalytically convert ethylene oxide with an absorbing medium and/or a catalyst carrier in the presence of water and a catalyst. A further variant of the method suggests to oxidize or reduce ethylene oxide by adding an oxidizing or reducing agent and water in the presence of a carrier for the oxidizing or reducing agent, whereby the carrier, depending on the oxidizing or reducing agent used, acts simultaneously as a catalyst and/or filling material.

Abstract: Method to remove organic halogenated molecules from gaseous currents arriving as a residue of industrial working processes or not, the gaseous current being delivered into a reactor (16) containing a fluid bed consisting of at least one solid adsorbent element after having undergone at least one filtration followed by a cooling, the gaseous current cooperating with the solid particles with exchange by adsorption between the gaseous current and the solid particles, the reactor (16) achieving a time of contact between the gaseous current and the solid particles at least longer than 3 seconds, the gaseous current which enters the reactor (16) having a temperature lower than 80.degree. C., but advantageously between 30.degree. and 70.degree. C., the cooling of the gaseous current upstream of the reactor (16) being followed by a gas/water or gas/air heat exchanger (13).

Abstract: A method for treating a gaseous effluent from a supercritical water oxidation reactor containing entrained solids is provided comprising the steps of expanding the gas/solids effluent from a first to a second lower pressure at a temperature at which no liquid condenses; separating the solids from the gas effluent; neutralizing the effluent to remove any acid gases; condensing the effluent; and retaining the purified effluent to the supercritical water oxidation reactor.

Abstract: A process for the recovery of carbon monoxide from a purge gas from acetic acid synthetic containing at least carbon monoxide, nitrogen and hydrogen, wherein the purge gas (6) containing at least carbon monoxide, nitrogen and hydrogen is separated into a gas fraction (11) rich in carbon monoxide and a residual gas fraction (12, 13) rich in nitrogen and hydrogen by an adsorption process (G), preferably by a pressure change absorption process, and the gas fraction (11) rich in carbon monoxide is returned upstream of the acetic acid.

Abstract: The present invention is directed towards a method that makes sulfuric acid from a dry flue gas desulfurization process which utilizes a low temperature regeneration of the carbon adsorbent in the flue gas process. The sulfuric acid is generated in an electrolytic reactor. This invention is also directed towards a system that regenerates the carbon used in dry flue gas desulfurization at a temperature below 120.degree. C.

Abstract: Selected strongly adsorbed gaseous impurities are removed from a gas stream by pressure swing adsorption in an adsorption system which includes a single adsorption vessel, a gas storage vessel and a single gas pump. Feed gas is pumped at a selected adsorption pressure cocurrently through the adsorption vessel, which contains an adsorbent that selectively adsorbs the selected impurity or impurities. The less strongly adsorbed components of the gas mixture pass out the adsorption vessel through the nonadsorbed gas outlet end of the adsorption vessel. When the adsorbed gas front reaches a certain point in the adsorption vessel, the adsorption step is terminated and gas is countercurrently transferred from the adsorption vessel to a gas storage vessel, optionally with use of the gas pump. The adsorption vessel is then countercurrently evacuated by use of the pump and a selected gas-enriched product is recovered and sent to storage or further processed in downstream treatment operations.

Abstract: Hydrocarbons are recovered from the product purge gas in an alkene polymerization process by absorption of heavier hydrocarbons from the purge gas by an intermediate hydrocarbon stream to yield a vapor rich in inert gas and alkene monomer. Alkene monomer is condensed at low temperatures from the inert gas, flashed and vaporized to provide refrigeration for the condensation step, and recycled to the polymerization process. The intermediate hydrocarbon from the absorption step is recycled to the polymerization process. Optionally a portion of the inert gas is reused for purge gas.

Abstract: A gas mixture comprised of nitric oxide and, optionally an inert gas, and containing small amounts of nitrogen dioxide, and perhaps moisture and sulfur dioxide, is purified by passing the gas stream through a bed of metal cation-free silica, alumina, or zeolite. The concentration of nitrogen dioxide, sulfur dioxide and moisture in the gas stream are significantly reduced as the gas mixture passes through the bed of adsorbent.

Abstract: Waste gases are purified by adding reagent and/or absorbent which reacts with pollutants in the gases to the gases, and then introducing the gases into a wetting reactor for activating the reagent or absorbent contained in the gases. The gases are introduced into a drying zone of the reactor and then passed upwardly into a wetting zone. The reagent or absorbent which has reacted partly or completely with the pollutants is separated from the gas by a filter in the upper section of the reactor and particles are intermittently detached from the filter and fall downwardly into an ash layer in the bottom of the reactor. The ash layer is capable of homogenizing wet particles and water droplets which fall downwardly from the wetting zone, and typically is at least about 25 cm thick. A mechanical mixer/grinder may be provided in the ash layer for mixing the particles and droplets and grinding lumps in the ash layer into particles.

Abstract: Disclosed is a method of adsorbing and removing NOx, by washing with water a gas discharged by ventilation from highway tunnels in a washing tower as pretreatment, and then adsorbing NOx in the gas with a rotary NOx adsorption unit. The washed gas may be heated by a heater which is placed between the washing tower and the rotary NOx adsorption unit.

Abstract: The waste water which is discharged from the anaerobic treatment stages of biological waste water treatment plants still contains highly volatile organic substances which, if not biodegraded, escape into the ambient air and lead to unwelcome odors. Also, the exhaust air of the anaerobic treatment stage may contain such highly volatile substances. An escape into the ambient air can be prevented if the waste water which is discharged from the anaerobic treatment stage is aerated with exhaust air sucked off from the anaerobic stage and if this exhaust air, after the aeration, is then fed to a spray washer and compost filter. The water for the spray washer is taken from the discharge of the anaerobic stage and returns there.