Abstract: This invention provides a method of producing polyester and charging apparatus therefor capable of producing a high quality polyethylene naphthalate usable for photographic purpose from recovered polyethylene naphthalate which comprises subjecting an ester-forming derivative consisting essentially of naphthalene dicarboxylic acid or its lower alkyl ester and a diol compound consisting essentially of ethylene glycol to ester exchange reaction or esterification to produce polyethylene naphthalate, wherein recovered polyethylene naphthalate resin is charged before beginning of effusion of alcohol or water which is a by-product of the ester exchange reaction or esterification, and a charging apparatus comprising a slidable inner pipe capable of penetrating through a supply valve.

Abstract: A fluid mixing system including a liquid mixing device and method for generating and maintaining a substantially uniform, horizontal velocity profile in a liquid circulation system, such as a plug flow reactor, which requires less horsepower than conventional liquid mixing systems without losing mixing effectiveness. The liquid mixing device employs a top-entry, vertically-oriented impeller and a housing that directs the pumped flow in a generally horizontal direction. The liquid mixing module may be positioned in close proximity to an aeration source within a channel.

Abstract: An apparatus including: a conduit operably connected to a source and extending downwardly therefrom, the conduit being adapted to permit a flow of particulate material from the source through the conduit; a fluidizing nozzle operably connected to the conduit and extending downwardly therefrom, the nozzle defining an inlet for receiving material from the conduit and defining an outlet for dispensing material from the nozzle to a receiver, the inlet defining an inlet cross sectional area perpendicular to the flow of the material and outlet defining an outlet cross sectional area perpendicular to the flow of the material, the inlet cross sectional area being larger than the outlet cross sectional area; the nozzle being adapted with a plenum including an inlet port for receiving compressed gas and a chamber adapted to communicate the gas to the porous walls of the nozzle, and an outlet port for engaging a vacuum source to continuously evacuate the receiver while the nozzle is engaged with the receiver; a conveyor

Abstract: An extruder for melting plastic granules which is designed as a two-stage system in an integrated structural unit with an extruder chamber having an extruder screw in a heatable housing, as well as with a drying chamber having a heated conveying screw with displacement elements which dry the plastic granules and axially convey them to the extruder chamber without compression. In a preferred embodiment, the conveying screw has a larger diameter than the extruder screw, and displacement elements of greater depth than the extruder screw.

Abstract: An impeller assembly for agitating a fluid contained in a vessel and dispersing a gas introduced therein. The impeller assembly includes an impeller having a plurality of generally radially extending blades. Each of the blades includes diverging upper and lower sheet-like portions having generally radially extending leading edges. The upper and lower portions are joined to form a generally V-shaped cross-section with a trailing vertex. The width of the upper portion of each blade is greater than the width of the lower portion of the blade such that the upper portion leading edge extends forwardly of the lower portion leading edge, thus producing an upper portion overhang to capture and disperse rising gas bubbles. The impeller assembly further comprises a drive assembly for rotating the impeller assembly.

Abstract: A food processing apparatus for washing, aeration drying, and blending food product. The apparatus comprises a food product container having a mating lid, a mesh basket insert, and a network of tubing having a plurality of spray nozzle apertures for producing a cleansing mist, and drying airstream, directed toward the enclosed food product. The container further includes a fitting for enabling communication between the tubing network and a water source and an air source, and a valved drain outlet. Blender blades are rotatably mounted to the container floor and driven by a motorized base which supports the container during normal operating modes.

Abstract: A pneumatic material transporter includes a material hopper (2), a screw conveyor (3) to transport the material (supplied from the hopper) from the rear portion to a front portion of the screw conveyor, a pressure chamber portion (5) to receive the materials from the screw conveyor and to press the materials down while adding a limited amount of water, a horizontal mixer (6) adapted to mix the material supplied from the pressure chamber portion with pressurized air, and then push the mixture to a material transporting conduit portion (8) connected to the mixer through a check valve portion, so that the material transporting conduit portion transports the materials to a yard.

Abstract: The present invention relates to a continuous dynamic mixing assembly comprising a pump assembly for motivating a fluid material into a mixing chamber and substantially preventing reverse flow of gas and/or fluid material and a continuous dynamic mixing chamber assembly for efficiently treating fluid material, the continuous dynamic mixing chamber comprising a cylindrical inner wall, elongated baffles coaxially extending along the major portion of the length of the inner wall, porous inserts for introducing gas into the mixing chamber and a multibladed agitator.

Abstract: The invention provides for flotation equipment which is locatable inside a container for a pulp to be subjected to a flotation process and a rotor or impeller or agitator rotatable within the container about a substantially vertical axis, the rotor including first means for imparting a radially upward pulp stream movement to pulp particles in the container, the first means being in the form of a set of arcuate surfaces located between the vanes and second means for moving air from atmosphere in a downward direction to below the pulp stream level in the container, the second means comprising a set of arcuate surfaces extending from the top of the rotor to outlets in the peripheral surfaces of the vanes.

Abstract: An improved slurry dryer of the type having a plurality of beater blades carried on a rotating shaft in a cylindrical housing, the improvement in combination therewith of a plurality of scraper blades mounted on at least one disk carried by the rotating shaft at the inlet end of the dryer for scraping the cylindrical side wall and the end wall to prevent the material entering the dryer from adhering and remaining on the side and end wall of the cylindrical housing. The scraper blades are replaceable and adjustable with respect to the side and end walls of the housing by slotted mounting to accommodate wear of the scraper blades. An air dam in the form of a radially extending disk is provided downstream of the scraper blade disks to direct drying air radially outward to impinge on the slurry material to be dried.

Abstract: Apparatus and process for high speed air dispersion (HSAD) and oxidation of elemental phosphorus in aqueous medium. The HSAD apparatus is an element used in a process designed for treating the highly toxic and hazardous phosphorus sludge wastes with oxygen-containing gas microbubbles at high shear rates in which the elemental phosphorus is quantitatively converted to soluble oxyphosphorus compounds which can be recovered after neutralization as fertilizer by products or disposed of as inert nonhazardous landfill material.

Abstract: Sewage water with entrained solids as an effluent is fed into the trough bottom shaped process tank that is a totally enclosed tank other than for inlets and outlets therefore. The system disposes of water from sewage effluents and also residual solids thereof and is fed sewage to a controlled depth in a tank trough with high temperatures used to sterilize the effluent. A two-speed motor driven mixer driven at low speed continually mixes and blend the sewage effluent at the same time air from a blower is bubbled through the mixture. Heat is added to increase water vapor saturation capability of the air flow through the system. The air/vapor mixture flows through a recuperative heat exchanger supported within the tank above the surface of sewage effluent contained therein, absorbing heat with flow, through a catalyst bed in a chamber with circulation through the heat exchanger and on out an exhaust vent with impurities oxidized and vented with air flow.

Abstract: Process and apparatus for the dispersion and proportioning of fibers used in the building sector in general that consists of mechanical equipment equipped with feeding, stirring and proportioning systems, which may be operated electrically or hydraulically, applicable to both hot and cold bituminous mixes, having an air injection dispersion system, that may or may not be equipped with a vibrating motor with elastic joint between the hopper and the proportioning body. In the stirring and proportioning body there are two shafts, one of which is provided with blades to homogenize the fibers and the other one has a spindle independent from the first shaft, which rotates at a variable speed, the fiber-air blend passing through the dispersion tube which is smaller than the proportioning tube. The fiber mass is made to fall on some deflectors located at the disperser outlet and the assembly may be mounted in an immovable or movable manner.

Abstract: A process and apparatus for removing SO.sub.2 from low-volume gas streams containing high concentrations of SO.sub.2 includes a tank scrubber containing an aqueous SO.sub.2 absorbent and an impeller. The tank scrubber has an unpartitioned vessel. The impeller includes a vertical rotating shaft having an upper and lower impeller. The lower impeller serves to agitate the SO.sub.2 absorbent. The upper impeller includes a shroud thereby directing the absorbent and gas outwardly toward the wall of the scrubber. The gas is injected into the absorbent at a point below the shrouded impeller. The shroud prevents gas bypass and thereby promotes gas-liquid mixing and, consequently, markedly improves SO.sub.2 removal efficiency.

Abstract: Components, usually but not exclusively gaseous components, are removed in a liquid medium from gas streams and chemically converted into an insoluble phase or physically removed. Specifically, hydrogen sulfide may be removed from gas streams by oxidation in aqueous chelated transition metal solution in a modified agitated flotation cell. The same principle may be employed with other procedures in which a gaseous phase is dispersed in a liquid phase to effect an interaction between components present in such phases. A gas-liquid contact apparatus, generally a combined chemical reactor and solid product separation device, comprising such modified agitated flotation cell also is described. In order to effect efficient mass transfer and rapid reaction, gas bubbles containing hydrogen sulfide and oxygen are formed by rotating an impeller at a blade tip velocity of at least about 350 in/sec. to achieve the required shear.

Abstract: Apparatus (20) for the dispersion of minute bubbles in a liquid resin material comprises high pressure tank means (21) containing a liquid resin material (M) under pressure; means for delivering (45) at least one agent selected from the group consisting of blowing agents and nucleating agents into the liquid resin material; means for agitating (63) the mixture of liquid resin material and the selected agent within the tank; means for shearing (60) the mixture; and control means (50) for determining the population of bubbles of the agent within the mixture and provides an output signal for controlling operation of the means for shearing, thereby altering the fineness of dispersion of the agent in the liquid resin material as desired.

Abstract: Equipment and a process for volumetric filling of novelties with soft frozen desserts is disclosed.

Abstract: Components, usually but not exclusively gaseous components, are removed in a liquid medium from gas streams and chemically converted into an insoluble phase or physically removed. Specifically, hydrogen sulfide may be removed from gas streams by oxidation in aqueous chelated transition metal solution in a modified agitated flotation cell. A gas-liquid contact apparatus, generally a combined chemical reactor and solid product separation device, comprising such modified agitated flotation cell also is described. In order to effect efficient mass transfer and rapid reaction, gas bubbles containing hydrogen sulfide and oxygen are formed by rotating an impeller at a blade tip velocity of at least about 350 in/sec. to achieve the required shear. To assist in the reaction, a surrounding shroud has a plurality of openings, generally of aspect ratio of approximately 1, of equal diameter and arranged in uniform pattern, such as to provide a gas flow therethrough less than about 0.02 lb/min/opening in the shroud.

Abstract: An apparatus for purifying and activating water is provided. The apparatus comprises a drive shaft having a hollow inside, a capsule secured to a lower end of the drive shaft, a device for supporting the drive shaft for rotation so that an upper opening of the drive shaft is positioned above the surface of water and the capsule is positioned in the water, and a motor for rotationally driving the drive shaft, the capsule including a plurality of small apertures communicating with the hollow inside of the drive shaft.

Abstract: A system including an apparatus and method for dissolving powder into a lid is disclosed. The apparatus includes a powder supply device which supplies powder, such as a water soluble resin polymer which is to be dissolved in water, to a powder and air mixing chamber. Pressurized air, at a low pressure, is mixed with the powder to provide an air and powder mixture. The pressurized air and powder mixture is supplied to the bottom of a powder and liquid mixing tank, below the surface of the liquid. A mechanical mixer gently agitates the liquid while the low pressure powder and air mixture is supplied to the mixing tank, to assure generally uniform distribution and dissolving of the powder in the liquid.

Abstract: This invention concerns the addition of fibrous alumina material to a phosphor or phosphor mixture before fluidization as a means of increasing the cohesiveness of the phosphor or phosphor mixture. The increase in cohesiveness can be controlled by varying the concentration of the fiber in the mixture.

Abstract: The present invention is to define an enclosed space by covering a holder which can hold numerous minute particles, and introduce a fluid into the enclosed space to stir up the numerous minute particles within the enclosed space with a turbulent flow of the fluid so that the minute particles are placed in and held by the holder After stirring up and loading the minute particles in the holder, the fluid is introduced into the enclosed space again to recover the remaining minute particles which have not been held by the holder. The number of minute particles required for one cycle of the loading operation are taken out by moving a particle push-up shaft vertically, having a recess at the distal end thereof, within a stocker which stores a large number of minute particles, and then delivered to the enclosed space with the fluid.

Abstract: The invention relates to an apparatus for feeding air into a flotation cell provided with a rotor and a stator. According to the present invention, air is fed into the intermediate space formed in between the rotor and stator covers, to above the rotor, wherefrom the air is distributed symmetrically.

Abstract: The present invention relates to a method for concentrating a certain mineral fraction attached to air bubbles from a slurry to the foam layer accumulated on the surface, so that the concentration takes place in three different mixing zones. The apparatus of the invention is formed of a colon-like flotation arrangement and of flow guides, a flow attenuator and an agitator belonging thereto. The flotation reactions are created in the bottom zone, wherefrom air bubbles and mineral particles carried by them are directed in a controlled fashion onto the surface of the apparatus. The flotation apparatus is so designed, that a strong agitation in the bottom zone can be used without causing harmful separation of the foam in the bottom part of the apparatus.

Abstract: The turbine agitator assembly including a reservoir for liquid, a rotor mounted in the reservoir and with a plurality of radially extending blades, and sparger means for introducing a fluid into liquid in the reservoir. The fluid sparger means and the rotor are so constructed and arranged that, in use, the rotor blades (submerged in the liquid) and/or the liquid flow they generate disperse the sparged fluid. Each of the blades is hollow and has a discontinuous leading edge, only a single trailing edge along an acute angle, no external concave surface and an open radially outer end.

Abstract: A device for use in the mixing of fluids, e.g. the gasification of liquids, comprises an elongate member including an internal passage; and, mounted on the elongate member via radials arms, one or more venturi members each having a convergent-divergent duct whose axis is substantially tangential to the elongate member, and in which the neck of the duct has an opening in communication, via passages in the radial, with the internal passage. On rotation of the device, reduced pressure in the duct neck draws fluid down the shaft of the elongate member.

Abstract: The laboratory apparatus is used for separating gaseous, liquid and solid substances from gas samples (for example air) to be trace analyzed. It comprises a vessel and a mixer insert with nozzles. The gas fed into the mixer insert emerges from the nozzles at high speed into an absorption liquid held in the vessel so that intensive mixing and hence high absorption of the substances takes place. After passing through the liquid the gas leaves the vessel via an outlet. The substances absorbed in the liquid are available for analysis.

Abstract: The invention relates to an apparatus for feeding air into a flotation cell provided with a rotor and a stator. According to the method and apparatus of the present invention, air is fed into the intermediate space formed in between the rotor and stator covers, to above the rotor, wherefrom the air is distributed symmetrically.

Abstract: A stainless steel tank has an inlet for food products such as pasta and a discharge end where the food product is discharged. A perforated cylinder is mounted to rotate within the tank and an auger is positioned within the cylinder to advance food product from the inlet to the discharge of the tank. The auger is fitted with a plurality of lifting baffles to extend radially inwardly from the cylinder between two adjacent flights of the auger to carry food products sidewardly and lift the food product out of water contained within the tank and allow the food product to tumble back into the water. Two manifolds extend into the tank beneath the perforated cylinder and have a plurality of apertures. A controller controls a supply of steam and a supply of pressurized air to selectively introduce steam and compressed air through the manifold apertures into the tank.

Abstract: In order to whip liquid cream even in reduced quantities, without any effort and risk, the apparatus according to the invention comprises a piston (7) provided in its front part (7b) with holes (17) through which a mixture of cream and air is pumped by jerky motions which whip the cream progressively as it moves towards a nozzle (16) dispensing the whipped cream. The rear part (7a) of the piston (7) operates with an excentric (4) actuated by a electric motor (2) and exerts oscillations along its longitudinal axis, thus modifying constantly the empty space in a tube (8) surrounding the piston (7). This modification of volume creates a sucking action on the liquid cream to which air is mixed and, at the same time, pumps said mixture by jerky motions towards the nozzle (16) through the holes (17).

Abstract: In concepts relating to biotechnology, fermentor and bioreactor apparatus and technology are provided for maximizing aeration for the cultivation and growth of aerobic microorganisms and tissue cells in artificial media such as aqueous growth media. The apparatus comprises a chamber with an impeller assembly for downward peripheral rotary flow under circumferential baffles that are downwardly disposed alongside microporous air sparger tubes. The agitation system preferably comprises a tree-turbine or a spherical-shaped impeller system. The apparatus provides advantages with respect to low shear, low power requirement, and high oxygen absorption rate, the latter being higher than conventional rates by an order of magnitude. In a preferred embodiment for the suppression of headspace foam, the invention comprises an assembly for forcing foam-destructive downdraft air into the headspace as well as stirrer or agitator assembly for stirring and breaking up foam that is present in the headspace.

Abstract: The present invention relates to a fluid agitator which may stir fluid in a closed space without leakage of the fluid. The fluid agitator has a motive means and a bearing means installed in the closed space. In the fluid agitator employing a electric motor as the motive means, only the stator coil of the motor which is weak in its resistance against high temperatures and humid atmosphere is sealed in a sealing chamber. The sealing chamber may be provided with a cooling device to cool the inside thereof. The driving shaft of the motor is supported by a bearing having resistance to high temperatures and high humidity and is provided with an agitating blade. In the fluid agitator employing a turbine system as the motive means, a turbine chamber and a turbine blade are set in the closed space. A fluid supply is furnished to introduce fluid into the turbine chamber from outside of the closed space for driving and rotating the turbine blade.

Abstract: The invention relates to an apparatus for treating a particulate thermoplastic material.This apparatus comprises a container (1) divided internally by a perforated partition (12) which serves as a passage for a purging gas. A suitable rotor (6) provided with blades (10) and (11) allows the treated charge to be maintained temporarily at a distance from the stationary and rotating internal walls of the apparatus.The invention applies especially to the coloring of particulate plastic materials by coating.

Abstract: A mobile soil and sludge treatment apparatus and a method of treating soil and sludge useful in a soil washing process or a biological decontamination of soils and/or sludges. In one embodiment of the invention, a plurality of tanks are mounted on a vehicular trailer for over-the-road movement and each tank includes aerator/mixers and a plurality of peripherally arranged air jets with the mixing, aeration and air jets combining to prevent settling of the solids in the slurry during the decontamination process. In a second embodiment of the invention, a single large tank is mounted on a vehicular trailer with the tank including aerator/mixers and a slurry pump for recirculating the slurry throughout the tank with the recirculating pipes terminating in jet nozzles or eductors which enhance mixing and solids suspension. In a third embodiment, the aeration/mixing is obtained by a plurality of downwardly directed air jet nozzles adjacent the bottom of the tank.

Abstract: An object of this invention is to provide a manufacturing method and apparatus for ice-cream products which enable a consumer to select and nominate the material and to be supplied and ice-cream in accordance with his preference from those selected material. According to the present invention, the method comprises preparing a mixture of the material bulk of ice-cream selected by an individual in accordance with his preference, filling into a container thereof by means of applying thereto a liquid nitrogen or a liquid nitrogen based gas while said bulk is agitated.

Abstract: Disclosed is a method for adjustably controlling the rate of circulation and temperature gradient in a fluidized bed.

Abstract: In accordance with illustrative embodiments of the present invention, a chlorine gas inductor unit for use in wastewater treatment includes an elongated bearing frame having upper and lower bearing housings secured to the opposite ends of a tubular member, a drive shaft extending axially through the bearing frame and being supported by bearings in the upper and lower housings, a mechanical seal housing mounted at the lower end of the bearing frame and housing a face seal assembly that prevents contamination of a non-hydrocarbon lubricating oil contained in the bearing frame with wastewater or chlorine gas, the drive shaft having a short-length portion extending below the seal housing, a propeller mounted on the lower end of the drive shaft and driven at high speed to cause a high velocity flow of wastewater, and orifice means responsive to rotation of the propeller and such high velocity flow to cause chlorine gas from a remote supply to be sucked through the orifice means and mixed with the wastewater flow.

Abstract: Aeration apparatus for use in recovering values from slurries in a flotation cell wherein the impeller has a plurality of blades extending generally radially and downwardly on its lower surface, each blade extending from the hollow drive shaft of the rotor to the periphery of the impeller and generally increasing in height radially outwardly along the length of the blade. In the preferred form of the invention a stator is provided having corresponding radial blades located beneath the impeller.

Abstract: A silo which is impeded by a mass of cohering particles is cleaned by the disclosed apparatus by extending at least one flexible tube connected to a mace into the silo to near the coherent mass and flowing gas through the tube and mace at a rate and pressure causing swinging and writhing movements by the mace and tube.

Abstract: A gas-liquid mixing process and apparatus having a vessel with an axial flow down-pumping impeller in a draft tube has gas ingestion tubes extending into a body of liquid from a hollow portion of the impeller shaft or other fluid communication means with the overhead gas in the vessel. Upon gas-liquid mixing at liquid levels that interfere with vortex development by the impeller, gas is drawn from the overhead through the ingestion tubes into the body of liquid.

Abstract: A mixing system for dispersing gas or other fluids in liquid which may have a solid suspension so as to improve mass transfer to the liquid or its solids suspension while maintaining a low pattern which is substantially axial (up and down) in the tank containing the liquid thereby also facilitating mixing (blending) utilizes an (unshrouded) axial flow impeller which provides the desired single stage axial flow downwardly to the bottom of the tank and upwardly along the sidewalls of the tank with radial flow confined principally to the bottom region of the tank. A sparge system which releases the gas or other fluid in the region at the bottom of the tank where the flow is predominantly radial allows attainment of gas rates with complete dispersion of gas throughout the tank which rates are much higher (about four times as great) as when conventional sparge systems are used with axial flow impellers.

Abstract: A method and apparatus for rapidly dissolving particles of dry water soluble polymers or gums in water. A suspension of polymer particles is formed and subjected to conditions of high shear in a particle size reduction apparatus whereby the finely divided particles are forced into solution. Sufficient water is present that heat is dissipated and molecular degradation of the polymer is avoided.

Abstract: A mechanical flotation machine comprises a flotation cell, a circulating pipe vertically installed therein, an axial impeller mounted in the lower portion of the pipe and a guide device secured to the lower end of the pipe. The guide device has an annular gap through which pulp flow generated by the impeller returns from the cell to the pipe. Vanes are installed in the annular gap to create, above the impeller, pulp flow rotating opposite to the rotation of the impeller.

Abstract: An apparatus for making post-foaming gels comprising, a piston chamber having an outer case defining a chamber, a piston being slidably received in the case and separating the chamber into a first compartment adjacent one end of the case for retaining a gel base, and a second compartment adjacent the other end of the case for retaining a compressed gas, with said piston having a hollow stem extending out of the other end of the case. The apparatus has a device for circulating the gel base through the stem and first compartment, and a device for introducing a foaming agent to the gel base while it is being circulated throught the piston chamber.

Abstract: An inorganic hydraulic material composition containing reinforcing short fibers is sprayed without breakage thereof, by fluidizing reinforcing short fibers in a blast of compressed air, by blending the flow of the reinforced short fibers fluidized in the blast of compressed air with a dry mixture of an inorganic hydraulic material such as cement with an aggregate such as sand in a dry blending region, by introducing the resultant dry blend into a water-mixing region, by mixing the dry blend with water, and by spraying the resultant wet composition through a spray nozzle.

Abstract: A method of rapidly dissolving particles of water soluble polymer gels in water. A suspension of gel particles is formed and subjected to conditions of high shear in a particle size reduction apparatus whereby finely sliced particles are formed and instantly dissolve in water. Sufficient water is present that heat is dissipated and molecular degradation of the polymer is avoided.

Abstract: The invention relates to methods and apparatus for agitating and heating a sub-surface volume of soil to liberate volatile compositions therefrom which are transmitted through a special flow passage created through the soil to the soil surface where they are analysed to determine the presence or absence of selected contaminants. A low pressure sink is provided to ensure proper flow of volatiles rapidly to the surface and to prevent contamination of adjacent soil blocks or cylinders during treatment.

Abstract: A method for introducing gases into liquids, wherein a stirred kettle is used which has the form of a cylindrical vessel in which the length/diameter ratio should be at least 1; and wherein the stirred kettle is filled to a level of more than 70% with the liquid into which gas is to be introduced, the gas feed rate is adapted to the absorption capacity of the liquid, and the stirrer speed is adjusted such that the largest coherent amount of gas is 10% of the volume of the stirred kettle.

Abstract: An apparatus for producing ice-cream from a flowable formulation consists of a storage container for the formulation and a cooling and freezing cylinder disposed beneath this and connected to the container by a feed pipe. An air line discharges into this cylinder, feeding compressed air which is to be whipped into the formulation. In order to prevent foaming in the storage container, a retaining means is associated with the feed pipe which largely seals the feed pipe when pressure obtains in the cylinder and in the storage container, substantially opening the feed pipe when the pressure therein fails.

Abstract: An apparatus for loosening and freezing heat processed cereals is disclosed. The cereals are in the form of separate grains when in a raw state and exhibit agglutinating properties after heat processing so as to become affixed to one another. The apparatus mainly includes a cylindrical rotary drum adapted for receiving the cereals previously heat processed and for loosening the cereals so as not to form lumps or blocks while the cereals are frozen, a unit for rotating the drum, a loosening member provided in the inside of the drum for carrying up the cereals and falling down in the drum, and a fluid blowing unit. The drum includes a netted wall having a mesh size to prevent the cereals from passing through the drum. The blowing unit is adapted to blow chilling fluid into the inside of the drum through the netted wall for blowing up and simultaneously freezing the cereals.