Abstract: The present invention is a filter mechanism provided in a pump or the like, and the purpose thereof is to provide a filter mechanism that can eliminate foreign matter adhering to the surface of a filter and thereby can prevent clogging of filters because of foreign matter. According to the present invention, an area toward the inside in the direction of the radius of the filter is linked to an intake opening (235) of the pump (for example, a trochoid pump (22)) and, via the pump (22) to a pump ejection opening (trochoid pump ejection opening (215)), and an area between a filter (5) and (an inside wall surface (3i) of) a first casing (3) is linked to a low-pressure ejection opening (discharge opening (237)) for a working fluid.

Abstract: Systems and methods for monitoring clogging in a cooking hood (120) are disclosed. The systems and methods can include measuring temperature in the non-exhaust side of a filter (110) and measuring pressure in an exhaust side of the filter (110) using temperature and pressure sensors (140,160). The systems and methods can further include comparing the measured temperatures and pressures to baseline temperature and pressure values to determine if clogging occurs using the controller (170), which is communicatively coupled with the temperature and pressure sensors (140,160).

Abstract: An air filter assembly includes an air filter element with a pleated filter and seals incorporated at either end to prevent contaminants from bypassing the filter. The air filter assembly includes a filter cover, first, second and third seals, and an air filter element with a large diameter and low micron rating.

Abstract: The present invention relates to a method for modifying the crystalline inorganic framework of an adsorbent with coatings to provide rate selectivity for one gas over others is described. The method described herein narrows the effective pore size of crystalline porous solids with pores less than about 5A for rate selective separations. This method of the invention comprises treating the hydrated or partially hydrated zeolite with a silicone derived binding agent followed by subsequent heat treatment. The additive content and treatment are adjusted to match effective pore size to specific separations. The superior adsorbent has the added convenience of bead forming simultaneously with pore modification as well as having the treatment result in the yielding of high crush strength products.

Abstract: A gas concentration device according to an embodiment of the present invention includes: an air supplier supplying pressurized air; a plurality of adsorption beds which separate pressurized air supplied from the air supplier into product gas and purge gas by a pressure swing adsorption method and discharge the separated product gas and purge gas; a flow passage regulating valve unit which regulates flow passages so as to allow the pressurized air to be supplied to the adsorption bed from the air supplier and so as to reduce pressure of the adsorption bed so that a nitrogen adsorption process and a nitrogen desorption process are alternately performed; and a pressure boosting unit which is configured to be fed with the purge gas and the product gas discharged from the adsorption bed and is configured to pressurize the product gas in multi-stage sequentially using the purge gas and the product gas.

Abstract: Systems and processes for use of concentric adsorbent beds with rotary valve assemblies are provided.

Abstract: Processes for forming and sequestering CO2 clathrates in a marine environment are disclosed.

Abstract: A system and method of using the system for controlling oxidation of sulfites to reduce total nitrite and nitrate levels in a slurry is disclosed. The system includes a tank having an inlet for receiving a slurry produced in a wet flue gas desulfurization process. The tank also includes an inlet for receiving a gas. The inlet for receiving the gas is operable to disperse at least a portion of the gas received in the tank through at least a portion of the slurry received in the tank. A sensor is configured to measure a sulfite concentration of the slurry received in the tank to obtain a sulfite concentration measurement. In some embodiments, the sensor is a sulfite analyzer. In other embodiments, the sensor is a virtual analyzer. The system also includes a controller. Software executing on the controller generates an electronic signal affecting an adjustment of a flow rate of gas into the slurry in the tank based at least in part on the sulfite concentration/sulfite concentration measurement.

Abstract: A process for selectively separating H2S from a gas mixture which also comprises CO2 is disclosed. A stream of the gas mixture is contacted with an absorbent solution comprising one or more amines, alkanolamines, hindered alkanolamines, capped alkanolamines, or mixtures thereof. The H2S/CO2 selectivity of the absorbent solution is preferably greater than about 4.0 for an acid gas loading [mol(CO2+H2S)/mol(amine)] between about 0.2 and about 0.6, and is achieved by reducing pH of the absorbent solution.

Abstract: The present disclosure describes a process for separating at least a first gas component and a second gas component by contacting a gas stream comprising the first and second gas components with a carbon molecular sieve (CMS) membrane under aggressive gas separation conditions in which the partial pressure of the selectively sorbed gas component in the gas stream is high. Despite the high partial pressure of the sorbed gas component, the selectivity of the carbon molecular sieve membrane is not substantially reduced by plasticization or saturation. In some embodiments, the aggressive gas separation process may include contacting a gas stream at supercritical conditions with a CMS membrane to separate at least first and second gas components. The process may be useful for, among other things, the separation of CO2 from a natural gas stream.

Abstract: A promoted activated carbon sorbent is described that is highly effective for the removal of mercury from flue gas streams. The sorbent comprises a new modified carbon form containing reactive forms of halogen and halides. Optional components may be added to increase reactivity and mercury capacity. These may be added directly with the sorbent, or to the flue gas to enhance sorbent performance and/or mercury capture. Mercury removal efficiencies obtained exceed conventional methods. The sorbent can be regenerated and reused. Sorbent treatment and preparation methods are also described. New methods for in-flight preparation, introduction, and control of the active sorbent into the mercury contaminated gas stream are described.

Abstract: An exhaust gas purifying catalyst provided with a honeycomb structured porous material, a first catalyst consisting of Pd, a coating layer which is formed on a surface of the porous material and a second catalyst consisting of Rh which is loaded onto the coating layer. The porous material contains a catalyst support consisting of a ceria-zirconia solid solution, a composite consisting of alumina and an inorganic binder. A content of the catalyst support in the porous material exceeds 50 parts by mass of a total 100 parts by mass for the catalyst support and the composite. The coating layer is provided with a catalyst support consisting of ceria-zirconia solid solution.

Abstract: The present application provides a switchable forward osmosis system, and processes thereof. In particular, this application provides a process for treating an aqueous feed stream, comprising: forward osmosis using an aqueous draw solution having a draw solute concentration of ?20 wt %, the draw solute comprising ionized trimethylamine and a counter ion; wherein, the feed stream: (i) comprises ?5 wt % total dissolved solids; (ii) is at a temperature of ?20° C.; (iii) is at a temperature between ?30° C.-?60° C.; (iv) has an acidic pH or a basic pH; (v) comprises organic content; (vi) comprises suspended solids; (vii) or any combination of two or more of i)-v). Also provided herein are the related system and draw solution for performing the process, and various uses thereof for treating typically difficult to dewater feed streams.

Abstract: A guide member for directing gas bubble flow along a member surface, the guide member having first and second side edges defining a channel for gas bubbles to flow along, the channel having an open bottom end through which the gas bubbles can enter the channel and an open top end through which the bubbles can exit the channel, and a diverting means adjacent the channel bottom end arranged to direct at least some of the incident gas bubbles in a first direction towards the channel bottom end. A membrane module assembly and a membrane filter system including the guide member.

Abstract: A separation membrane for selectively separating (e.g., pervaporating) a first fluid (e.g., a first liquid) from a mixture comprising the first fluid (e.g., first liquid) and a second fluid (e.g.

Abstract: A filter module (10) including: a housing (12) extending between an opposing first (14) and second end (16) and defining an inner chamber (18), a plurality of hollow fiber membranes (20) located within the inner chamber, a tubesheet (26) including the ends (24) of the hollow fibers encased but open within a block of potting material, an end cap (30) secured to the end of the housing and including: a permeate fluid outlet (32) in fluid communication with the ends of the hollow fibers, and a concentrate fluid outlet (34) in fluid communication with the inner chamber, wherein the permeate and concentrate fluid outlets are axially aligned, and a concentrate distributor (36) including: an annular ring (38) located adjacent to the second end of the housing, at least one aperture (40) in fluid communication with the inner chamber, and an annular concentrate passageway (42) extending from the aperture and concentrically about the permeate tubesheet to the concentrate fluid outlet of the permeate end cap.

Abstract: A porous tube or conduit formed in a series of loops coiled around a center line, the series of loops having a first loop, the first loop having a first extension configured with a first open end in fluid communication with the first loop, the series of loops having an end loop, the end loop having a second extension configured with a second open end in fluid communication with the end loop, wherein the first open end and the second open end are positioned proximate the center line and the first loop, and, thus, functions to provide a more efficient filter having less plugging or clogging of the filtration membrane, reduced the need for self-cleaning of the porous tube, minimize the effects of pressure drop across a porous tube, installed inside a tank, accommodating shipping, handling, and storage, simplified system arrangement, thereby provide a more efficient filtration device, system, process.

Abstract: The present specification provides a composition for interfacial polymerization of polyamide including at least one of an amine compound and an acyl halide compound; a surfactant; and a compound represented by Chemical Formula 1, and a method for preparing a reverse osmosis membrane using the same.

Abstract: A slurry injection system having a plurality of clear fluid pumps receiving clear fluid from a low pressure clear fluid manifold and pressurizing the clear fluid into high pressure clear fluid and communicating the high pressure clear fluid into the high pressure clear fluid manifold. A blender unit having low pressure slurry therein. A mixer receives clear fluid through a first valve. A slurry pressurizer in fluid communication with the high pressure clear fluid manifold through a second valve. The slurry pressurizer forms high pressure slurry by pressurizing the low pressure slurry from the blender unit using high pressure manifold clear fluid that is communicated to the mixer and communicates low pressure fluid to the low pressure clear fluid manifold. The mixer mixes the high pressure slurry and clear fluid from the first valve to form a mixture that is communicated to a slurry injection site.

Abstract: Process for internally loading liquids onto carriers and achieving time-release dry liquid concentrate. The resulting time-release dry liquid concentrates having a variety of applications, including animal attractants and repellants, down hole chemicals, flavors and fragrances of food and beverages, treatment of contaminants, fertilizers, vitamins.

Abstract: A disposable container, such as a deformable bag, for a fluid, having one or more inlets and one or more outlets and an impeller assembly within the container to cause mixing, dispersing, homogenizing and/or circulation of one or more ingredients contained or added to the container. The impeller assembly has a protective hood surrounding at least a portion of the moveable blades or vanes of the impeller assembly and being above at least a portion of the blades or vanes. The hood surrounds the blades or vanes and arcs over the height of the blades or vanes. The hood is shaped in a dome shape or semi-spherical shape that is around and above the impeller blades and acts as a protector for the container surface against the impeller assembly both during shipping and storage as well as when in use, particularly at lower liquid levels.

Abstract: A method and a device for the production of graphene or graphene-like material are provided. The method can comprise the following steps: providing particles of a crystalline graphitic material; dispersing the particles in a solvent or surfactant mixture; submitting the mixture to a cavitation force such that cavitation bubbles are present; and submitting the mixture to high shear agitation. The cavitation and high shear agitation steps can be simultaneous, in particular in the same enclosed vessel. The device for the production of graphene or graphene-like material can comprise a reactor having an enclosed vessel for receiving a solvent or surfactant mixture with dispersed particles of a crystalline graphitic material. The reactor can be arranged for: submitting the mixture in the enclosed vessel to a cavitation force such that cavitation bubbles are present and, simultaneously in the same enclosed vessel, submitting the mixture to high shear agitation.

Abstract: Described in detail herein is an automated paint mixing system. The paint mixing system includes a mobile device which can receive an input associated with a color of a paint. The mobile device can transmit the input associated with a color to a first computing system. The first computing system can receive the input associated with a color. The first computing system retrieve an identifier associated with the color based on the input. The first computing system can transmit the identifier associated with the color to a second computing system. The second computing system can instruct a paint dispenser to mix and generate a specified amount of paint of the requested color based on the received identifier. The second computing system can instruct a 3-D printer to fabricate a three-dimensional container configured to store the generated paint. The paint dispenser can deposit the generated paint in the three-dimensional container.

Abstract: Connector devices (3) for mixing and stirring viscous liquids is disclosed. The connectors are an injection molded plastic and are recyclable. The first device is a one piece mixing connector combining a hexaxial shaft for power drill attachment by insertion into the adjustable drill chuck and a cavity insertable slotted bracket located at the opposite end of a shaft for insertion of a mixing stick. The assembled parts are then lowered into a container and the drill activated by the trigger turning the assembly and stirring the liquid. The second device is a one piece plastic, recyclable, rectangle “ring” that is put on the stick before mixing and slowly removed in the opposite direction of installation thus using the squeegee effect to push the unused material back into the container for future use.

Abstract: The present invention concerns an apparatus for treating and cooling foundry moulding sand, comprising a mixing container and a mixing tool rotatable about a drive shaft, wherein there is provided an air feed for the feed of air into the container interior. To provide an improved apparatus with which a more uniform fluidised layer is produced as far as possible over the entire cross-section of the mixing container, wherein moreover the proportion of the solid particles entrained with the gas flow is to be reduced, it is proposed according to the invention that the mixing tool has at least two mixing vanes spaced from each other in the vertical direction and at least one mixing vane has a mixer blade with a surface which is inclined relative to the horizontal.

Abstract: High thermal transfer, hollow core extrusion screws (50, 52, 124, 126, 190) include elongated hollow core shafts (54, 128, 130, 192) equipped with helical fighting (56, 132, 134, 194) along the lengths thereof. The fighting (132, 134, 194) may also be of hollow construction which communicates with the hollow core shafts (54, 128, 130, 192). Structure (88, 90) is provided for delivery of heat exchange media (e.g., steam) into the hollow core shafts (54, 128, 130, 192) and the hollow fighting (132, 134, 194). The fighting (56, 132, 134, 194) also includes a forward, reverse pitch section (64, 162, 216). The extrusion screws (50, 52, 124, 126, 190) are designed to be used as complemental pairs as a part of twin screw processing devices (20), and are designed to impart high levels of thermal energy into materials being processed in the devices (20), without adding additional moisture.

Abstract: Systems and methods are provided for conversion of light paraffinic gases to form liquid products in a process performed in a fixed bed radial-flow reactor. The light paraffins can correspond to C3+ paraffins. Examples of liquid products that can be formed include C6-C12 aromatics, such as benzene, toluene, and xylene. The fixed bed radial-flow reactor can allow for improved control over the reaction conditions for paraffin conversion in spite of the fixed bed nature of the reactor. This can allow the process to operate with improved efficiency while reducing or minimizing the complexity of operation relative to non-fixed bed reactor systems.

Abstract: The present invention relates to a distributor and a down flow catalytic reactor comprising same, and according to one aspect of the present invention, provides a distributor comprising: an inside downcomer which has a first flow space; an outside downcomer which is disposed so as to surround at least some area of the inside downcomer, and has a second flow space partitioned from the first flow space of the inside downcomer; and a cap which has a plurality of slots and is mounted on the inside or the outside downcomer so as to enable a fluid that has passed through the slots to flow to at least one flow space among the first flow space and the second flow space.

Abstract: The present invention relates a steam methane reformer tube outlet assembly and a method of assembling or retrofitting same. More specifically, it relates to an exposed flanged tube outlet of a reformer designed to mitigate metal dusting corrosion, dew point condensation-related metal fatigue and cracking, and over-temperature induced metal failures such as hydrogen attack.

Abstract: A tubular reactor that produces maleic anhydride from a gas mixture containing n-butane and oxygen includes a first reaction zone including an inlet for the gas mixture and a second reaction zone including an outlet for a reaction gas mixture, a plurality of tubes extending in an axial direction through the first and second reaction zones, a temperature control system, configured for controlling a reaction temperature in each of the reaction zones independently, includes a heat transfer system for each of the reaction zones configured for controlling the temperature of a liquid coolant flowing through one of the reaction zones, and a circulation pumping system configured for controlling flow conditions of the liquid coolant flowing through the reactor and one of the heat transfer systems, and a preheating arrangement configured for preheating the gas mixture such that the gas mixture enters the first reaction zone at a predefined inlet temperature.

Abstract: Device for injecting fluids into the free area of a rotating fluidized bed revolving in a fixed cyclone chamber, and method using this device, comprising a device for tangentially injecting secondary fluids, enabling rotating rings of fluids to be formed in said free area along the side walls of said cyclone chamber, in order to separate from said side walls fluid flows exiting along said side walls and accelerate their rotation velocity, and thus to improve the retention of the solid particles entrained by said exiting fluid flows

Abstract: Provided is a polysilicon manufacturing apparatus including a reactor disposed on a base plate to form a reaction chamber, a pair of electrical feedthroughs installed on the base plate to be extended to the inside of the reaction chamber, rod filaments installed on the electrical feedthroughs in the reaction chamber and connected to each other by a rod bridge at the upper end to form a silicon rod by chemical vapor deposition of source gas introduced to a gas inlet, and a cooling jacket inserted to a through-hole provided at the upper side of the reactor to be supported to the base plate, connected to a gas outlet formed on the base plate by forming a gas passage discharging the gas after reaction, and introducing and circulating a low-temperature coolant to a coolant passage from the outside of the reactor by forming the coolant passage at the outside of the gas passage to discharge a high-temperature coolant to the outside of the reactor.

Abstract: The present invention relates to a method of producing an oligomer array. The invention comprises the steps of: providing a substrate with a multitude of recesses; introducing a first particle with a first molecule into a recess; releasing the first molecule from the first particle; binding the first molecule to a second molecule to form an oligomer while immobilizing the second molecule in the recess; optionally repeating the steps, wherein at least one of the first particles and/or the first molecules comprises a detectable marker.

Abstract: Disclosed herein is a method of: treating an organic polymer with an electron beam-generated plasma; exposing the treated polymer to air or an oxygen- and hydrogen-containing gas, generating hydroxyl groups on the surface of the polymer; reacting the surface with an organosilane compound having a chloro, fluoro, or alkoxy group and a functional or reactive group that is less reactive with the surface than the chloro, fluoro, or alkoxy group; and covalently immobilizing a biomolecule to the functional or reactive group or a reaction product thereof.

Abstract: A reforming tube including a cavity emerging on either side of the tube, an external wall, an internal wall, a protection element for protecting against corrosion inserted into the cavity mirroring at least a portion of the internal wall, a space between the internal wall and the protective part, and a refractory material which fills in the space between the internal wall and the protection element.

Abstract: A glass lined reaction tank for chemical and pharmaceutical industries and a manufacturing method thereof. One-step molding technical standards for manufacturing iron blanks of the glass lined reaction tanks are deeply developed, an overall structure of a flanged big flange of a tank body and a tank cover matching with the tank body are innovated, and nominal pressure of the big flange and the sealing performance of a tank mouth are perfectly improved. By using a new structurally-combined precise controlled internal heating type electric furnace and an intelligent temperature program control/adjustment/recording instrument, heating temperature of an overall glass lining layer on an inner wall of the tank body is more accurately controlled to be the same, and a synchronous, integral and controlled sintering core technique is realized.

Abstract: A venting cap is disclosed for pressure vessels for microwave-assisted chemistry. The venting cap includes a flexible circular cover for closing the mouth of a reaction vessel, a flexible annular wall depending from the circular cover, and a flexible annular ring at the bottom of the annular wall and parallel to the circular cover for positioning the cap on a reaction vessel. At least one indentation in the circular cover minimizes distortion when any contents of a reaction vessel exert pressure against the cap, and at least one opening in the annular wall provides a ventilation path through the cap when gas pressure in a reaction vessel flexes the cap sufficiently to partially disengage at least a portion of the cap from the mouth of the reaction vessel.

Abstract: Various embodiments that pertain to oxygen enrichment are described. Oxygen enrichment is shown to allow for independent control of both reformer residence time and the oxygen-to-carbon ratio during reforming. This allows for much better control over the reformer and for significant gains in reformer through-put without negative impacts to reformer performance. Additionally, the use of oxygen enriched reforming is shown to result in enhanced reformer performance, reduced degradation from catalyst poisons (carbon formation and sulfur) and enhanced fuel cell stack performance due to greatly increased hydrogen concentration in the reformate.

Abstract: Various embodiments that pertain to oxygen enrichment are described. Oxygen enrichment is shown to allow for independent control of both reformer residence time and the oxygen-to-carbon ratio during reforming. This allows for much better control over the reformer and for significant gains in reformer through-put without negative impacts to reformer performance. Additionally, the use of oxygen enriched reforming is shown to result in enhanced reformer performance, reduced degradation from catalyst poisons (carbon formation and sulfur) and enhanced fuel cell stack performance due to greatly increased hydrogen concentration in the reformate.

Abstract: Copper adsorbents which are resistant to the reduction by the components of the synthesis gas at normal operation conditions. The adsorbents are produced by admixing small amounts of an inorganic halide, such as NaCl, to the basic copper carbonate precursor followed by calcination at a temperature sufficient to decompose the carbonate. The introduction of the halide can be also achieved during the forming stage of adsorbent preparation. These reduction resistant copper oxides can be in the form of composites with alumina and are especially useful for purification of synthesis gas and the removal of mercury, arsine, phosphine, as well as hydrogen sulfide.

Abstract: The present disclosure provides an adsorption tower for an oxygen generator system configured to adsorb nitrogen in air and supply oxygen, the tower comprising: a housing defining an inner space therein in which an adsorbing agent is filled; a housing inlet through which air enters into the housing; an housing outlet through which air is discharged from the housing, wherein the housing inlet is opposite to the housing outlet; a sodium based adsorbing agent layer disposed in the inner space and adjacent to the housing inlet; and a lithium-based adsorbing agent layer disposed in the inner space and adjacent the housing outlet.

Abstract: Sorbents are disclosed which exhibit less inherent leaching of arsenic and antimony than what is achieved by conventional sorbents. The inventive sorbents are formed by a process which includes the steps of contacting the porous sorbent particulate with a solution of a metal oxide or metal hydroxide, or a metal oxide or metal hydroxide precursor, and depositing metal oxides and hydroxides within the pores of the porous sorbent particulate. Purification of water is also described.

Abstract: Compositions are disclosed herein comprising poly alpha-1,3-glucan or poly alpha-1,3-1,6-glucan polymer having an open-cell pore structure with an average pore size of about 100 nm to about 3000 nm in diameter. Such polymers have enhanced aqueous liquid absorption capacity, and can be comprised in various products having aqueous liquid absorption function. Methods of preparing glucan polymers of the compositions provided herein are also disclosed.

Abstract: Provided is an affinity chromatography carrier having an excellent purification purity, including a substrate, a hydrophilic polymer, and an affinity ligand, in which the substrate is constituted of at least one selected from the group consisting of a polysaccharide, an acrylate-based polymer, a methacrylate-based polymer and a styrene-based polymer, the hydrophilic polymer is at least one selected from the group consisting of hydrophilic polysaccharides, the affinity ligand is at least one selected from the group consisting of an antibody-binding protein and an antibody-binding polypeptide, a carboxy group is introduced into the affinity chromatography carrier, and the amount of the carboxy group introduced is 15 mmol/L-gel to 60 mmol/L-gel in terms of ion exchange capacity.

Abstract: The present disclosure is directed to absorbent articles with substrates or topsheets having repeating patterns of apertures comprising a plurality of repeat units. Each of the repeat units comprises at least three apertures.

Abstract: Sorbent materials are described that have enhanced performance in removing chlorine and chloramine, among other toxic compounds. The sorbent materials are formed by a process which includes steps of oxidation, adding a nitrogen-containing compound, and calcining the sorbent. The processes of forming the sorbent materials are also disclosed. The sorbent materials have excellent performance as measured by a chloramine and/or chlorine destruction number, and the sorbents retain a high nitrogen edge concentration. The sorbent materials may also be incorporated into devices such as filter assemblies.

Abstract: A process for manufacturing particles of water-absorbing material is provided. The process includes providing a powder bed composed of an absorptive powder comprising a water-absorbing polysaccharide onto a surface; releasing an aqueous solution from a solution dispenser so as to contact the powder bed, 5 thereby forming a solution-impregnated humid material; letting the solution-impregnated humid material agglomerate in substantially shear-less conditions to form an agglomerated humid material, the solution-impregnated humid material being supported by the surface; and drying the agglomerated humid material, thereby forming the particles.

Abstract: Forming a photocatalyst/aerogel composite includes contacting an aerogel including a porous carbon nanotube network with a solution including a photocatalyst precursor to yield a wet gel. The porous carbon nanotube network includes carbon nanotubes, nodes, and struts. Each node is defined by a region in which two of the carbon nanotubes are in direct contact with each other, and each strut is defined by one of the carbon nanotubes extending between a first node and a second node. Forming the photocatalyst/aerogel composite further includes initiating a chemical reaction in the wet gel to form, on the nodes and struts, photocatalyst nanoparticles from the photocatalyst precursor, and removing liquid from the wet gel to yield an aerogel composite defining pores and including the photocatalyst nanoparticles. The photocatalyst nanoparticles are covalently bonded to the nodes and the struts throughout the porous carbon nanotube network.

Abstract: The current embodiments relate to ruthenium-containing supported catalysts, including processes for their manufacture and use, which destroy, through catalytic oxidation, hazardous compounds contained in chemical industrial emissions and otherwise produced from industrial processes.

Abstract: The present disclosure relates to a method of preparing a zinc ferrite catalyst. More particularly, the present invention relates to a method of preparing a zinc ferrite catalyst comprising a) a step of dissolving a zinc precursor and an iron (III) precursor in water to prepare an aqueous metal precursor solution; b) a step of precipitating a solid catalyst precursor while vaporizing water in the aqueous metal precursor solution; and c) a step of firing the precipitated solid catalyst precursor to prepare a zinc ferrite catalyst. In accordance with the present disclosure, the method of preparing a zinc ferrite catalyst can be simply carried out without a pH adjustment step and can secure reproducibility.