the present invention may be used to dispense most types of particulate matter which are typically loaded into vessels and any other confined spaces . a particularly advantageous use of the present invention is to load catalyst particles into a reactor vessel . a particular advantage for the use of catalyst charged with the apparatus of the present invention is in various hydrocarbon conversion processes such as hydrogenation , reforming , hydrocracking , polymerization , hydrodesulfurization and dehydrogenation , for example , wherein such hydrocarbon conversion processes are carried out in a non - fluidized catalyst bed reactor , which includes fixed bed reactors and moving bed reactors . this invention is particularly advantageous with hydrodesulfurization , hydrocracking , hydrogenation and reforming processes . a particularly preferred application of this invention is with reforming and hydrogenation processes . the various process conditions of temperature , pressure and space velocity vary according to the process and such conditions include those well known to those skilled in the above - mentioned processes . an additional advantage of increased bulk density of loaded catalyst is that catalyst life may be extended for the same throughput and severity . this extension of catalyst life is a result of the tangible effect of the increased weight of catalyst in a fixed reactor volume as well as the less tangible effect of uniform gas , liquid or gas - liquid distribution which coincides with the more uniform voltage of a densely - loaded catalyst bed . longer catalyst life results in a longer unit run length . furthermore , dense loading of all reactors in an integrated refinery would provide a means for predicting , controlling and optimizing the occurrence of turnaround , based on the premise that catalyst life in each reactor of the refinery network would become a predictable function of tangible factors such as catalyst properties , throughput and operating severity . intangible effects associated with maldistribution , settling and hotspots would be minimized by dense catalyst loading . in a particularly preferred embodiment , the utilization of this particle dispensing apparatus provides for an improved reforming process wherein a reforming catalyst is charged to a reactor with the apparatus of the present invention ; then hydrogen and a dehydrogenatable organic material , for example , a petroleum hydrocarbon , are contacted with the reforming catalyst and a reformed organic material is recovered . thus , the reforming process provides for allowing more throughput at the same severity for a given reactor vessel and for greater catalyst weight per volume of reactor vessel . the increase in catalyst bulk density , therefore , allows for the construction and use of smaller and less expensive reactor vessels for a given throughput . the apparatus of the present invention is used in one embodiment to charge catalyst particles to a reactor vessel in a downflow relationship to the reactor vessel . in general , reactor vessel sizes varying between about 1 to about 16 feet , preferably from about 2 to about 13 feet in diameter , and from about 5 to about 125 feet , more preferably from about 10 to about 75 feet in length can be charged . the rate of fill of the reactor vessel can be non - uniform . however , it is preferred that the rate of fill be uniform and that after a given rate of fill is established , this rate of fill be maintained while preparing the catalyst bed . the catalyst particles are introduced into the reactor vessel at a point such that the distance to the catalyst surface formed as the catalyst particles are introduced through a gaseous medium provides an average free fall distance of catalyst particles of at least about 1 foot , more preferably an average free fall distance from about 5 to about 125 feet and still more preferably from about 10 to about 70 feet . the gaseous medium in general is air or , depending on the catalyst , an inert medium such as nitrogen . thus , in general , the catalyst particles fall individually to the catalyst surface as the catalyst bed is formed . the catalyst particles are distributed over the surface area of the catalyst bed as it is formed such that the catalyst surface raises at a substantially uniform rate . the catalyst particles are distributed in order to produce a substantially flat catalyst surface defined as a difference between the highest portion of the catalyst surface and the lowest portion of the catalyst surface which is less than 10 percent of the diameter of the catalyst bed , more preferably less than 5 percent and still more preferably less than 1 percent . one of the most commonly used configurations utilized as vessels or reactors is the vertical cylinder with a circular , horizontal cross - section . it is also contemplated that vessels having a horizontal cross - section other than circular may also be loaded with the apparatus of the present invention , however , the apparatus of the present invention is highly suitable for loading particulate matter into a circular vessel . the term &# 34 ; rate of fill &# 34 ; implies the rise in bed height and may be expressed with units of feet per hour ( ft / hr ). another term , particle flux , is convenient to characterize the features of the loading speed and is defined as the pounds of catalyst particles dropped on an area of one square foot in one hour ( lb / ft 2 hr ). it has been found that there is a certain particle flux most favorable for optimal loading of a given catalyst . particle flux and rate of fill are related by the catalyst loaded bulk density : ## equ1 ## it is preferable that a flux between 100 and 1500 lb / hr - ft 2 is used for increasing the catalyst loaded bulk density , and that more preferable results are obtained for most catalysts using a flux between 300 and 1000 lb / hr - ft 2 . the above rates of fill , free fall distance , and uniform distribution of the catalyst within the above preferred ranges are preferred since they provide for approaching substantially the maximum bulk density achievable for a given catalyst bed . the reactor vessel sizes which are preferred are those reactors which , in general , are utilized in commercial processes such as hydrogenation , reforming and hydrocracking . this invention is applicable to catalyst particles which are spheres , pills , extrudates , crystals and cylinders , for example . in general , the particle diameter should not be greater than 3 % of the bed diameter and , preferably with a diameter from about 1 / 64 to about 1 / 2 of an inch , more preferably from about 1 / 16 to about 1 / 4 of an inch . catalyst particle diameter refers to the nominal particle dimension in the case where the particle is not spherical . a wide variety of solid catalysts may be charged to catalytic reaction zones with the apparatus of the present invention such as oxidation , hydrodesulfurization , hydrocracking , reforming and hydrogenation catalysts . the composition , preparation and other characteristics of such catalysts are well known to those skilled in the art of catalysis . commercial separation zone vessels are also suitably loaded with adsorbent particulates in a manner utilizing the dispensing apparatus of the present invention . commercial separation zone vessels vary in width or diameter from about 1 foot to about 15 feet or more , and have lengths from about 5 feet to about 70 feet or more . the apparatus of the present invention is preferably located in an upper locus of the vessel to be loaded with particulate matter and , of course , has an overall diameter less than the vessel to be loaded . the particle outlets or rotor apertures preferably have a total length as measured in a radial direction in the range from about 2 % to about 50 % of the diameter of the particle bed . in addition , the particle outlets or rotor apertures are generally tapered and have an increasing width in an outwardly extending direction . the area of the apertures which is available for flow of the particulate matter is adjustable by rotating the baffle plate around a vertical central axis of the rotor in relation to the apertures . the minimum width of the available and usable rotor apertures is preferably at least about 125 % of the nominal diameter of the particles being distributed . the loading apparatus rotor is preferably rotated at a speed sufficient to directly deposit at least some of the particles upon the outer periphery of the resulting bed of particles . in a preferred embodiment , the baffle plate is held in a central position by a shoulder bolt which passes through the central axis of the baffle plate and is fastened by threads to the bottom of the rotor . in addition , the baffle plate is also held in position after suitable adjustment by one or more rotor clamps which are attached to the bottom of the rotor . in a preferred embodiment , the rotor clamp is drilled and tapped to hold an adjustment screw which may be advanced to clamp the baffle plate to the bottom of the rotor to prevent the rotation of the baffle plate with respect to the rotor during the loading of the particulate matter . this rotor aperture control mechanism permits a simple one step adjustment whereby the baffle plate masks the rotor aperture so as to control the flow of particulate matter at different locations along the aperture . the baffle plates are sized so that different plates are matched to different sizes of particulate matter . then the set - up of the rotor is simply a matter of installing the appropriate baffle plate . the apparatus of the present invention ensures that each aperture opening will be identical which is critical since even a slight variation in the different apertures can have a dramatic difference in the levelness of the loaded particle bed . this simultaneous adjustment of multiple aperture openings is an advantageous benefit enjoyed by the present invention . this strict control of the aperture dimensions , both length and width , provides for a simpler and faster loading process as well as a more level particle bed thereby resulting in a more dense , uniform bed . it is desirable to minimize the loading rate such that the hopper of the particle loading machine remains nearly full at all times which allows the rotor to operate as designed , instead of an on - again , off - again mode where particles may be selectively diverted into one region of the rotor , and preferentially loaded into one region of the vessel . the reason that transient loading rates should be avoided is that constant variation in loading rate causes deviation from optimal flows which leads to bed profile irregularity . the slot control of the present invention allows for fast and easy adjustment of loading rate so that adjustments are more likely to take place in commercial use settings where work stoppage is generally viewed as undesirable . adjustment is a matter of loosening the set screws in the rotor clamps , rotating the baffle plate in relation to the rotor to achieve a larger or smaller aperture and re - tightening the set screws . careful , synchronized adjustment of aperture openings in cramped reactor spaces is very difficult to accomplish so the accuracy of the aperture dimensions is vastly improved by the simplified rotor aperture control of the present invention . as the particle loading rate is adjusted to match the available particle lifting capacity , the baffle plate adjustment provides the proper aperture shape that yields a flat particle bed profile . referring now to fig1 particle dispensing apparatus 4 is shown located and suspended in an upper locus of vessel 1 . particulate matter inlet conduit 2 supplies particulate matter to particle dispensing apparatus 4 which dispenses particulate matter to bed 3 . referring to fig2 particle dispensing apparatus 4 has a generally vertically oriented particle container 5 which receives and stores particulate material before it is dispensed . particulate matter is loaded into the top of particulate container 5 and flows downwardly into rotor 6 which is in communication with particle container 5 . the particulate matter is transported through rotor 6 and is introduced into rotor arms 7 which are in open communication with rotor 6 . the particulate matter flows from a lower portion of rotor arms 7 through rotor apertures ( not shown ). a motor 13 is attached to and supported by motor support 16 which , in turn , is attached to and supported by particle container 5 . motor 13 mounted on motor support 16 rotatably turns drive shaft 14 which is attached to rotor support 15 . rotor support 15 is attached to and supports rotor 6 . as drive shaft 14 rotates in unison with rotor support 15 and rotor 6 , downwardly flowing particulate matter is dispensed via rotor arms 7 . referring now to fig3 rotor 6 is supported and rotated by means not shown and receives flowing particulate matter through the top opening and flows in a generally horizontal direction through rotor arms 7 . rotor clamps 10 are utilized to immobilize a baffle plate 9 ( not shown ). rotor pivot hole 12 is centrally located in the vertical axis of rotor 6 to serve as a positioning and pivoting means for baffle plate 9 . referring to fig4 which is a plan view of rotor 6 which has equally spaced outwardly disposed rotor arms 7 . each rotor arm 7 has a rotor aperture 8 which communicates with the interior of rotor arm 7 for passage of particulate matter and a rotor clamp which is utilized to adjustably fasten a baffle plate 9 ( not shown ) to rotor 6 in order to adjustably mask rotor aperture 8 . rotor pivot hole 12 serves to position baffle plate 9 during rotation thereof with respect to rotor 6 when rotor clamps 10 are released . fig5 is a plan view of baffle plate 9 which has equally spaced baffle plate leaves 18 . a baffle plate pivot hole 17 is positioned at a central location of baffle plate 9 . each baffle plate leaf 18 is positioned to mask at least a portion of rotor aperture 8 and is releasably clamped into a fixed position by rotor clamp 10 . in order to rotatably position baffle plate 9 with respect to rotor 6 , rotor pivot hole 12 is pivotably located in direct alignment with baffle plate pivot hole 17 . the foregoing description and figures clearly illustrate the advantage encompassed by the loading apparatus of the present invention and the benefits to be afforded with the use thereof .