Abstract: A product made by a substantially zero carbon emission process for making amorphous poly alpha olefins including, converting alkanes to olefin monomers ethylene, propylene, and 1-butene or combinations thereof using renewable electric power in an oxidative-coupling of methane plant including the steps of passing alkanes through an ethylene plant while adding oxygen, passing the first polymerization grade ethylene through a 2-butene plant, passing a first of the two 2-butene streams and one of the polymerization grade ethylene through a propylene plant, and passing a second of the two 2-butene streams through a 1-butene plant. The next step in the process for making amorphous poly alpha olefins includes polymerizing at least one of the polymerization grade alkenes which includes applying a temperature of 130 degrees Fahrenheit to 175 degrees Fahrenheit to at least one of the polymerization grade alkenes and scrubbing at least one boiler stack gases.

Abstract: A substantially zero carbon emission process for making amorphous poly alpha olefins including, converting alkanes to olefin monomers ethylene, propylene, and 1-butene or combinations thereof using renewable electric power in an oxidative-coupling of methane plant including the steps of passing alkanes through an ethylene plant while adding oxygen, passing the first polymerization grade ethylene through a 2-butene plant, passing a first of the two 2-butene streams and one of the polymerization grade ethylene through a propylene plant, and passing a second of the two 2-butene streams through a 1-butene plant. The next step in the process for making amorphous poly alpha olefins includes polymerizing at least one of the polymerization grade alkenes which includes applying a temperature of 130 degrees Fahrenheit to 175 degrees Fahrenheit to at least one of the polymerization grade alkenes and scrubbing at least one boiler stack gases.

Abstract: CO2 is removed from high-pressure feed gas in configurations and methods according to the inventive subject matter by contacting feed gas with cooled semi-rich solvent to form a two-phase mixture that is flashed into the bottom section of an absorber. Rich solvent from the absorber is then reduced in pressure to generate refrigeration for the semi-rich solvent and lean solvent countercurrently contacts the partially treated feed gas in the absorber to produce the semi-rich solvent. Among other advantages, cooling of the feed gas and semi-rich solvent by the pressure reduced rich solvent heats the rich solvent to allow enhanced regeneration of the solvent, and external refrigeration and heating of the solvent can be entirely avoided.

Abstract: A method for sorbing a gas using an ionic liquid to sorb a vapor having an electric multi-pole moment. The ionic liquid comprises an anion and a cation. The electric multi-pole moment may be an electric dipole moment and/or an electric quadru-pole moment. The sorption may be an adsorption or an absorption. The ionic liquid may be a liquid that substantially contains only anions and cations, while not containing other components, such as water. Alternatively, a solution containing the ionic liquid and a solvent or further compound, such as water, may be used.

Abstract: A system for removing Hg contained in flue gas from a boiler, the system includes: a heat exchanger for performing heat exchange of the flue gas from the boiler; a precipitator for removing soot and dust in the flue gas; a wet desulfurization device for removing mercury oxide Hg2+ in the flue gas using an alkali absorbent; and; a removal assistant supply unit for supplying a removal assistant for removing impurities into a limestone and gypsum slurry that circulates through the wet desulfurization device.

Abstract: We have now discovered a novel process for the removal or extraction of metal species from a variety of solid, liquid or gas phase materials. Metal species may be removed by contacting the material suspected of containing one or more metals with a thiolated fatty acid or ester thereof for a period of time and under conditions effective for the sequestration of the metal species by the thiolated fatty acid or ester thereof. The thiolated fatty acid or ester thereof comprising sequestered metal species may then be separated and recovered from the treated material. Moreover, following the treatment of aqueous liquids or mixtures, or suspensions or dispersions of solids in aqueous liquids, the resultant thiolated fatty acid or ester thereof comprising the sequestered metal species is insoluble in water and forms a separate layer from the aqueous liquid phase, which layer may be readily removed.

Abstract: An object of the present invention is to provide a heavy metal removing apparatus which can efficiently remove the heavy metal contained in the dust produced by burning of the raw material containing the heavy metal, and a cement production system comprising the heavy metal removing apparatus. The heavy metal removing apparatus 10 comprises a cyclone separator 11 which separates exhaust gas containing the heavy metal from a part of the dust heated to a temperature equal to or more than a temperature at which the heavy metal can volatilize, a bag filter 13 which is connected to the subsequent stage of the cyclone separator 11 and separates the exhaust gas containing the heavy metal from the remainder of the dust, and a heavy metal removal tower 14 which is connected to the subsequent stage of the bag filter and removes the heavy metal from the exhaust gas.

Abstract: A method of assembling an acid gas component reduction system includes coupling at least one acid removal system in flow communication with at least one first synthetic gas (syngas) stream with at least one acid gas component having a first acid gas component concentration. The method also includes coupling at least one integral absorber in flow communication with the at least one acid removal system. The method further includes configuring the at least one integral absorber such that substantially continuous service of the at least one integral absorber facilitates producing a second syngas stream having a second acid gas component concentration that is less than the first acid gas component concentration.

Abstract: A method for treating cement kiln exhaust is provided. The method includes the steps of: providing a cement kiln exhaust gas stream from a kiln; providing a water soluble alkaline-earth metal polysulfide; combining the cement kiln exhaust stream with the water soluble alkaline-earth metal polysulfide to create a combined stream; and removing at least a portion of one heavy metal from the combined stream.

Abstract: A gas purification system including a hydrogen sulfide (H2S) absorber, a carbon dioxide (CO2) absorber, a flash tank, and a H2S concentrator. The gas purification system may also include a gas path though the H2S absorber prior to the CO2 absorber, a first solvent path sequentially through the CO2 absorber, the H2S absorber, and the H2S concentrator, and a second solvent path sequentially through the CO2 absorber, the flash tank, and the H2S concentrator, wherein the first and second solvent paths flow a common solvent.

Abstract: A method for modifying the properties of a sorbent comprising washing a sorbent with a washing solution so as to achieve an exchange of ions between the sorbent and the washing solution, and applying a halogen compound to the sorbent that has been washed with the washing solution to achieve a predetermined concentration of the halogen on the sorbent.

Abstract: In some embodiments, the invention provides systems and methods for removing carbon dioxide and/or additional components of waste gas streams, comprising contacting the waste gas stream with an aqueous solution, removing carbon dioxide and/or additional components from the waste gas stream, and containing the carbon dioxide and/or additional components, in one form or another, in a composition. In some embodiments, the composition is a precipitation material comprising carbonates, bicarbonates, or carbonates and bicarbonates. In some embodiments, the composition further comprises carbonate and/or bicarbonate co-products resulting from co-processing SOx, NOx, particulate matter, and/or certain metals. Additional waste streams such as liquid, solid, or multiphasic waste streams may be processed as well.

Abstract: The invention relates to a process for purifying crude synthesis gas (1) containing metal carbonyls, in which undesirable substances such as sulphur components and/or carbon dioxide (CO2) and/or hydrocyanic acid (HCN) are scrubbed out by scrubbing with a physically acting scrubbing medium in at least one process step (main scrub (H)), and also an apparatus for carrying out the process. The crude synthesis gas (1) before introduction into the main scrub (H) is subjected to a gas scrub (carbonyl scrub (C)) in which a partial amount (4) of the laden scrubbing medium (2) taken off from the main scrub is used as scrubbing medium, with the partial amount (4) being chosen so that the metal carbonyls are (selectively) separated off from the crude synthesis gas (1) in the carbonyl scrub (C) largely independently of the other gas components.

Abstract: Metal ions are adsorbed or absorbed by a combination of a binding ligand and an ionic liquid effective to dissolve the metal complex. The ligand is preferably bound to a solid surface which is coated with the ionic liquid. This method is particularly suitable for adsorbing gaseous mercury, lead, zinc and cadmium.

Abstract: A combustion system having improved mercury collection. The system includes a combustion chamber for burning a fuel containing mercury, whereby burning produces a flue gas stream containing mercury and a device for removing mercury from the flue gas stream. The device includes a thermopolymer substrate; and a mercury-receptor attached to the substrate. In one embodiment, the system may further include a collector downstream of the device for collecting the mercury attached to the thermopolymer. The inventions further include alternative methods of mercury removal and preparation of the polymer substrate.

Abstract: The invention provides a process for removal of hydrogen sulphide, iron pentacarbonyl and nickel tetracarbonyl from a feed synthesis gas stream, the process comprising the steps of: (a) removal of hydrogen sulphide and of iron pentacarbonyl by contacting the feed synthesis gas stream with an absorbing liquid comprising water, physical solvent and an amine, to obtain a synthesis gas stream depleted of hydrogen sulphide and depleted of iron pentacarbonyl; (b) adsorption of nickel tetracarbonyl by contacting the synthesis gas stream depleted of hydrogen sulphide and depleted of iron pentacarbonyl with solid adsorbent comprising activated carbon to obtain solid adsorbent enriched in nickel tetracarbonyl and a purified synthesis gas stream.

Abstract: Methods and systems for handling sour carbon dioxide (CO2) streams are provided. In one aspect, a method for sequestering an emissions-heavy gas includes removing at least a portion of an acid gas from a rich solvent in an acid gas stripper to create the emissions-heavy gas, and channeling the emissions-heavy gas to a storage system.

Abstract: A method for removing Hg (mercury) from waste gases is disclosed, the removing of the mercury (Hg) gas (vapors) is by contacting the waste gas with a scrubbing agent being organic sulfoxides either in pure form or as with an emulsion of water-in-organic sulfoxides. The waste gas can be any waste gas containing mercury gases or mercury vapors, such as combustion flue gas and waste gases generated in various chemical and industrial processes.

Abstract: A treatment system to efficiently remove lead from dust contained in extracted cement kiln combustion gas while reducing facility and running costs. A treatment system 1 comprising: a probe 3 for extracting a part of combustion gas, while cooling it, from a kiln exhaust gas passage, which runs from an inlet end of a cement kiln to a bottom cyclone; a classifier 5 for separating coarse powder from dust contained in the combustion gas extracted by the probe 3; a wet dust collector 6 for collecting dust from the extracted gas containing fine powder discharged from the classifier 5; and devices 12, 13 for feeding sulfurizing agent for sulfurizing lead contained in the kiln exhaust gas to the wet dust collector 6, and others. From the sulfurizing-agent feeders 12, 13 are preferably added the sulfurizing agents to a circulation liquid tank 7 or a pump 9 for circulating slurry.

Abstract: The invention relates to an improvement in apparatus and process for the formation of a complex of Lewis acidic or Lewis basic gases in a reactive liquid of opposite character and for the breaking (fragmentation) of said complex associated with the recovery of the Lewis gas therefrom. The improvement resides in forming finely divided droplets of reactive liquid and controlling the temperature, pressure and concentration of said Lewis gas of opposite character to provide for (a) the formation of said complex between said gas and reactive liquid or (b) the breaking of said complex and the recovery of the atomized droplets of reactive liquid.

Abstract: The invention provides methods and apparatuses for removing aerosols and, in some cases, vapor phase contaminants, such as mercury, from a gas stream. One method is directed to the removal of additional aerosols from a gas stream from which aerosols have previously been removed by using a screen in combination with a primary aerosol collection device. Another method is directed to the removal of both aerosols and vapor phase contaminants by using a sorbent in combination with a screen. Another method is directed to the removal of vapor phase contaminants by using a catalyst to convert the contaminant to a form that is more easily removed from the gas stream and optionally injecting a chemical to increase the rate of conversion. The invention also provides various apparatuses for use in performing the various methods of the invention.

Abstract: Methods of sequestering carbon dioxide (CO2) are provided. Aspects of the methods include precipitating a storage stable carbon dioxide sequestering product from an alkaline-earth-metal-containing water and then disposing of the product, e.g., by placing the product in a disposal location or using the product as a component of a manufactured composition. Also provided are systems for practicing methods of the invention.

Abstract: A method of removing elemental mercury from gas phase fluids by contacting the gas with an organic compound dissolved in a gas scrubbing liquid.

Abstract: The present invention relates to a method of producing novel monodisperse chelate resins based on crosslinked polymer beads containing aminomethyl groups and/or aminomethyl nitrogen heterocyclic groups that have a high uptake capacity for heavy metals and rapid kinetics.

Abstract: An apparatus for removing constituents from a fluid stream is provided. The apparatus includes a duct, a collection device, a sorbent injector, and an acoustic generator. The duct has a fluid passageway to receive a fluid stream having constituents. The collection device filters the fluid stream. The sorbent injector injects a sorbent in the fluid passageway of the duct. The acoustic generator generates an acoustic field in the fluid passageway of the duct to promote sorption of the constituents for collection by the collection device. Additionally, a method is provided for removing constituents from a fluid stream.

Abstract: A process for the recovery of metal oxides from a solution containing metallic salts by spray roasting of these solutions. The process is particularly suitable for spray roasting spent pickling acids. The process feeds the solution to a reactor for spray roasting of the droplets in at least two stages, where at least one evaporation stage follows at least one conversion stage to convert the metal salts to metal oxides. The device for implementing the process includes a spray roasting reactor having a first heating zone to evaporate the water and a second heating zone to convert the metal salts to oxides.

Abstract: The present invention is directed to a process and apparatus for removing and stabilizing mercury from mercury-containing gas streams. A gas stream containing vapor phase elemental and/or speciated mercury is contacted with reagent, such as an oxygen-containing oxidant, in a liquid environment to form a mercury-containing precipitate. The mercury-containing precipitate is kept or placed in solution and reacts with one or more additional reagents to form a solid, stable mercury-containing compound.

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: The invention describes a process for removing mercury from flue gases of high-temperature plants, in particular power stations and waste incineration plants in which a bromine compound is fed to the if appropriate multistage furnace and/or the flue gas in a plant section downstream of the furnace, the temperature during contact of the bromine compound with the flue gas being at least 500° C., preferably at least 800° C. The combustion is carried out in the presence of a sulphur compound, in particular sulphur dioxide. Subsequently to the furnace, the flue gas is subjected to an if appropriate multistage cleanup for removing mercury from the flue gas, which cleanup comprises a wet scrubber and/or a dry cleanup.

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: The loaded wash liquid contains H 2 S, CO, H 2 , CO 2 , nickel carbonyl and/or iron carbonyl. Carbon monoxide is initially and partially removed from the loaded wash liquid and the wash liquid which is low in CO is conducted through a reaction and settling zone. Sludge containing nickel and/or iron sulfide is extracted from the reaction and settling zone and the wash liquid is conducted to a heat regeneration device The regenerated wash liquid can be re-utilized for desulfurization purposes.

Abstract: Process for the removal of metal cabonyls before regeneration of a desulfurization wash liquid, which includes removing a part of the carbon monoxide from the wash liquid, conversion of the metal carbonyls to metal sulfides, passing the wash liquid through a reaction and settling zone, removing metal sulfide-containing sludge from the reaction and settling zone, and regenerating the wash liquid.

Abstract: An oxygen separation and combustion apparatus such as a boiler or a nitrogen generator in which a plurality of fluid passages and oxygen transport membranes are located within a combustion chamber. The oxygen transport membranes separate oxygen from an oxygen containing gas, thereby to provide the oxygen within the combustion chamber to support combustion of a fuel and thereby to generate heat. The fluid passages are positioned to allow a portion of the heat to be transferred from the combustion to the oxygen transport membranes to heat said oxygen transport membranes to an operational temperature and a further portion of the heat to be transferred from the combustion to the fluid, thereby to heat the fluid and also, to help stabilize the operational temperature of said oxygen transport membranes. Fuel is introduced into the combustion chamber by injection or as a mixture with circulated flue gas.

Abstract: A weld chamber has an air intake and an exhaust or evacuating ductwork for evacuating gases and other particles from the welding chamber. The evacuating ductwork is connected to a vacuum source to remove gases and by products from the weld chamber during welding. A throttle plate is provided in the evacuating ductwork adjacent the weld chamber to adjust or regulate the air velocity evacuating from the weld chamber. The evacuating duct then leads to a sealed water filtering tank. All of the exhausted/evacuated gases and by products are led beneath the water line and bubble through the water before emerging from the sealed water. The soot and iron particles are immediately cooled and trapped in the water tank. Moreover, particles become wet and are less likely to become airborne thus leading to a substantial portion of the particles being trapped in the sealed water tank. Thee remaining gases are then evacuated to the vacuum source and further filtered by a mechanical filtration device.

Abstract: The invention relates to an apparatus for performing membrane gas/liquid absorption at elevated pressure, comprising a pressure vessel in which a membrane unit is provided for separate feed-through of the gas phase and the liquid phase, in such a way that exchange of components to be absorbed can take place between the gas phase and the liquid phase, the flow direction of the gas phase through the absorber being essentially perpendicular to the flow direction of the liquid phase through the absorber. The invention further relates to a method for performing gas/liquid membrane absorption employing this absorber, in particular for the absorption of CO2, H2S, mercury (vapor) and/or water (vapor) from a gas phase at elevated pressure. The invention finally relates to a method for refining natural gas using the absorber and method according to the invention.

Abstract: There is described a method for regeneration of triethylene glycol (TEG) that has been used as a drying medium to remove water from a fluid such as natural gas, where a drier TEG is recovered at the bottom fraction in a regeneration column (7), where water vapor together with other gases is removed at the top fraction and where the partially dried TEG from the regeneration column (7) optionally is also supplied to a stripping column (9) for further dehydration, where in the optional stripping column (9) and in the still column (7) there is supplied a stripping gas in countercurrent to the TEG stream, where as stripping gas there is mainly used gas which is recovered from the top fraction from the regeneration column (7). There is also described an apparatus for carrying out the method.

Abstract: A method is disclosed for recovering germanium from a gaseous mixture which includes a germanium-containing compound in vapor or particulate form, acid in vapor form, and water vapor. The gaseous mixture is contacted with a liquid containing water under conditions effective to dissolve the germanium-containing compound in the liquid. The acidity of the resulting liquid mixture is increased under conditions effective to vaporize the germanium-containing compound. The vaporized germanium-containing compound is contacted with one or more aqueous solutions under conditions effective to dissolve and precipitate the germanium-containing compound in at least one of the one or more aqueous solutions, and the resulting precipitate is separated from the at least one of the one or more aqueous solutions. The methods described herein are particularly well suited for recovering germanium from the waste gases produced during optical waveguide manufacturing processes.

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: A process for the separation and recovery of fluorochemicals from a gas stream containing a diluent gas and fluorochemicals by contact of the gas stream with a membrane system in combination with an adsorption system, the adsorption system used either before or after the membrane system.

Abstract: A hydroprocessing process includes two hydroprocessing reaction stages, both of which produce a liquid and a vapor effluent, and a liquid-vapor contacting stage. The first stage vapor effluent contains impurities, such as heteroatom compounds, which are removed from the vapor by contact with processed liquid effluent derived from one or both reaction stages and, optionally, also liquid recovered from processed vapor. The first and contact stage liquid effluents are passed into the second stage to finish the hydoprocessing. The contact and second stage vapor effluents are cooled to recover additional hydroprocessed product liquid.

Abstract: A process is disclosed for removing the very fine oxide particles produced during regeneration of used pickling acids by pyrolysis. The process includes the step of spraying water into the gaseous stream to produce a mist of fine droplets and thereafter passing the gaseous stream through a liquid separator. The invention is also directed to a plant for carrying out the process where the plant includes a nozzle to spray water droplets into the gaseous stream before the drop separator.

Abstract: A recirculating fume scrubber system in which fume is evolved from an aqueous bath in a process vessel, such as an HCl pickling tank, and the evolved fume is scrubbed with water and then the scrubbed gas is divided into two portions, one of which is released to a stack vented to atmosphere and the other portion is recirculated to the scrubber.

Abstract: A method for removing mercury from a gas stream. In the method, sorbent is injected into the gas stream. Water is dispersed into the gas stream to create a cooled gas stream. The cooled gas stream is allowed to dwell with the sorbent in a chamber to remove mercury from the cooled gas stream. The cooled gas stream is passed through an electrostatic precipitator located above the chamber which collects water and recycles the collected water back into the chamber for cooling the gas stream in the chamber. An apparatus for removing mercury from a gas stream is also provided.

Abstract: A process for determining if intermittent water injection is the best way to remove deposits such as salts from refinery process streams. A water vapor pressure, P1, at stream conditions and a water vapor pressure, Ps, at saturation conditions in the stream, are used to calculate a ratio P1/Ps. If the ratio is less than 0.1 intermittent water washing is preferred. An optimized intermittent injection procedure, frequency, duration, and constraints, is disclosed. Chemical speciation calculations ensure that all accumulated salts are removed, and that an aqueous phase forms downstream of the water injection point having a salt concentration within acceptable limits.

Abstract: A continuous water washing process for removing salts from refinery process streams is disclosed. The salt and salt precursor content of a process stream is determined, and iterative calculations made to ensure an aqueous phase forms downstream of the water injection point with a salt and ion concentration within acceptable limits. Preferably chemical speciation calculations are used to check for corrosive, transient aqueous phases intermediate the point of water injection and the process outlet.

Abstract: A method and an apparatus for cleaning a gas containing pollutants, such as hydrogen chloride and heavy metals, are described. The polluted gas (2) is contacted with an aqueous washing liquid (3) in a scrubber (1), whereupon part of the washing liquid is preevaporated in a preevaporation unit (7) to form a hydrochloric-acid-containing top fraction, which is essentially free from heavy metals, and a bottom fraction containing hydrochloric acid and heavy metals. Part of the bottom fraction is recirculated (15) for renewed preevaporation, while the remainder of the bottom fraction is treated (16) to remove any heavy metals present. The top fraction from the preevaporation is distilled in a rectification unit (22) to form a top fraction (31) and a bottom fraction (35).

Abstract: The effluent stream from the treatment of glass with vapor-phase coating materials contains tin residues. By washing that effluent stream, in an apparatus having a scrubber bed and flow-control and -recycling means, with an acidic solution having a limited concentration of the tin residue, recovery efficiency of the post-coating treatment is improved, and process emissions are reduced.

Abstract: A method for inhibiting the deposition of zinc, iron, and mixed zinc-iron metals on the metal surfaces of a scrubber system comprising adding to said scrubber system a water soluble polymer having repeat units (a) and (b) of the structure ##STR1## wherein M is a water soluble cation. This invention is particularly effective at inhibiting zinc, iron, and mixed zinc-iron deposition on the metal surfaces of the fan, fan shroud and mist eliminator of the scrubber system.

Abstract: A precipitating agent containing thioacetamide is described for the precipitating of heavy metals from flue gases and waste waters, it containing thioacetamide (C.sub.2 H.sub.5 SN) in a 1-20% aqueous solution, which, in addition, contains a buffer substance in order to prevent hydrolyric spontaneous decomposition, the solution having a pH of between 5.5 and 9.0.

Abstract: A scrubber for industrial exhaust systems advantageously employs liquid gallium to adsorb vapor phase mercury as well as sub-micron sized particulates such as other trace metal constituents from a hot gas exhaust stream in an industrial exhaust system. The temperature of the liquid gallium is elevated for optimum adsorption efficiency, and subsequently lowered to separate the adsorbed mercury and other species.