US3880667A - Diffusion tower for extracting particulate material - Google Patents

Diffusion tower for extracting particulate material Download PDF

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Publication number
US3880667A
US3880667A US392186A US39218673A US3880667A US 3880667 A US3880667 A US 3880667A US 392186 A US392186 A US 392186A US 39218673 A US39218673 A US 39218673A US 3880667 A US3880667 A US 3880667A
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US
United States
Prior art keywords
channel
combination
tubular element
screen bottom
space
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US392186A
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English (en)
Inventor
Elmar Straube
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HAFTUNG FRIED KRUPP 4300 ESSEN 1 GERMANY GmbH
BWS Technologie GmbH
Original Assignee
Maschinenfabrik Buckau R Wolf AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maschinenfabrik Buckau R Wolf AG filed Critical Maschinenfabrik Buckau R Wolf AG
Application granted granted Critical
Publication of US3880667A publication Critical patent/US3880667A/en
Assigned to HAFTUNG, FRIED KRUPP GESELLSCHAFT MIT BESCHRANKTER, 4300 ESSEN 1, GERMANY reassignment HAFTUNG, FRIED KRUPP GESELLSCHAFT MIT BESCHRANKTER, 4300 ESSEN 1, GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BUKAU-WALTHER AKTIENGESELLSCHAFT
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B10/00—Production of sugar juices
    • C13B10/08—Extraction of sugar from sugar beet with water
    • C13B10/10—Continuous processes
    • C13B10/102—Continuous processes having rotatable means for agitation or transportation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D11/00—Solvent extraction
    • B01D11/02—Solvent extraction of solids

Definitions

  • the distributor has a channel from which particles enter the chamber.
  • a bottom plate is provided on the inner tubular element below the screen bottom, being rotatable with the inner tubular element and having a cutout which communicates with the channel.
  • a casing surrounds the lower end region of the elements and defines an annular inner space which communicates with the cutout and which is provided with an inlet for particles to be extracted.
  • the present invention relates generally to a diffusion tower, and more particularly to a diffusion tower extracting particulate material, especially sugar-beet chips. Still more particularly the invention relates to such a diffusion tower for extracting particulate material in counterflow.
  • Diffusion towers are well known and require no detailed discussion. They serve for extracting soluble sub stances from various kinds of materials, for instance, for extracting sugar from sugar-beet chips.
  • lt is known to construct such towers by providing two upright tubular elements, which are concentric with one another and define an annular extraction chamber. At the bottom region the extraction chamber is closed off by a screen bottom. and located above the same, usually but not necessarily turnable with the inner tubular element which may be rotatable, is a distributor having a channel from which a mash containing particulate material to be extracted, for instance sugarbeet chips, which will hereafter be used for the purpose of further explanation, enters into the extraction chamber. The mash is supplied by a pump. A portion of the distributor wipes over the surface of the screen bottom, as the distributor rotates in order to continuously clean mash off the screen bottom.
  • a mash containing particulate material to be extracted for instance sugarbeet chips
  • the extraction chamber in this type of construction is filled with mash, and newly incoming mash is admitted below the column of mash in the annular extraction chamber.
  • the purpose of the distributor and the channel therein is to distribute the incoming mash evenly over the screen bottom. The even distribution is an important factor in the degree of efficiency of extraction which can be obtained.
  • the prior art proposes an arrangement in which the mash is admitted through a central tube or conduit in the diffusion tower.
  • This central admission of the mash has certain disadvantages, however, including the fact that as has been found in actual practice two seals at different levels must be provided in the region in which the mash is admitted, because the mash admitting tube must be passed through the journal for the inner tubular element of the diffusion tower.
  • An additional object of the present invention is to provide such an improved diffusion tower in which the supply and forced distribution of incoming mash is improved and simplified.
  • Another object of the invention is to provide such an improved diffusion tower, wherein the entire construction at the lower end portion of the tower is simplified.
  • a diffusion tower for extracting particulate material which comprises an upright outer tubular element and a rotatable inner tubular element concentric with the outer tubular element and defining therewith an annular extraction chamber. Both of the elements have lower end regions and a screen bottom is mounted in the chamber at the lower end region.
  • a particle distributor is rotatable with the inner tubular element above and in wiping contact with the screen bottom and has a channel from which particles enter the chamber.
  • a bottom plate is provided in the inner tubular element above the screen bottom and is rotatable with the inner tubular element. The bottom plate has a cutout which communicates with the channel.
  • a casing is provided at the lower end region and defines an annular inner space which communicates with the cutout and which has an inlet for particles through which the particles enter the inner space in the casing.
  • the perhaps most important aspect of the present invention is the fact that the lesser height of especially the lower region of the diffusion tower permits given otherwise unchanged circumstances, the overall height of the tower to be maintained unchanged and, in such an event, the volumetric content and the height of the annular extraction chamber will of course be increased over prior art constructions.
  • the effectiveness of the screen bottom and the overall extraction effectiveness of the diffusion tower can be improved, without in any way detracting from the necessary constant cleaning of the screen bottom, by having the channel in the particle distributor be open in downward direction, that is towards the screen bottom.
  • the forced distribution of the particles over the cross-section of the annular chamber. that is over the entire surface of the screen bottom can be further improved by providing the channel in the region of the screen bottom and in a location which. as seen with reference to the direction of rotation of the particle distributor, is the trailing region of the channel, with a freely tiltable or pivotable flap which assures that the newly imcoming mash will always be supplied in the region of the screen bottom, that is below the already partially extracted chips in the extraction chamber.
  • the upright shaft on which the inner tubular element rotates may be made to pass through the annular inner space defined by the casing, being seen with respect thereto by a shaft seal, and may be axially and radially journalled below the aformentioned casing.
  • FIG. 1 is a somewhat diagrammatic vertical section showing the lower region of a diffusion tower in accordance with one embodiment of the invention, the section being taken on line H of FIG. 2;
  • FIG. 2 is a section taken on line II-II of FIG. 1;
  • FIG. 3 is an enlarged fragmentary vertical section, showing details of FIG. 1 on an enlarged scale;
  • FIG. 4 is a section taken on line IV-IV of FIG. 2;
  • FIG. 5 is a view similar to FIG. 2 but illustrating a further embodiment of the invention.
  • FIGS. 1 -4 DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • an outer tubular element 1 which is vertically arranged, and which is closed by the lower end by a housing 2.
  • an inner tubular element 3 which defines with the outer tubular element an annular extraction chamher and can be rotated by means of a non-illustrated drive (details of the drive are known, and are not of importance for an understanding of the invention), about its vertical axis.
  • the inner tubular element 3 is journalled for such rotation in a bearing 6 which is mounted in the lower support 5 of the tower.
  • the inner tubular element 3 serves not only to define with the outer tubular element, the extraction chamher, but also to rotate a particle distributor 9, the agitating arms 10, and a non-illustrated particle ejector (which would be provided at the region of the upper end of the tower).
  • Retarding members 11 are provided at the inside of the outer tubular element 1, intermediate the agitator arms 10, to retard the mash in the annular extraction chamber.
  • the free inner cross-section of the annular extraction chamber is spanned above the bottom wall 8 of the housing 2 by a screen bottom 7.
  • the lower end of the inner tubular element 3 is provided with an element 12 to which the shaft 4 is secured which is journalled in the bearing 6 on which the inner tubular element 3 rotates.
  • the lower free end of the shaft 4 is supported in the bearing 6 which is capable of absorbing axial as well as radial forces.
  • the lower end region of the inner tubular element 3 also is provided with a bottom plate 13 having an opening 15 which overlaps the particle channel 14 of the particle distributor 9.
  • the bottom wall 8 is provided with a central opening which is of a larger dimension than the cross-section of the shaft 4, and downwardly of the central opening there is provided a casing 17 which forms an annular space 16 and is provided with an inlet 18 through which the newly incoming mash is admitted into the space 16.
  • the shaft 4 extends through the space 16 and a seal 19 seals it with respect to the casing 17.
  • the lower end wall 22 of the casing 17 is upwardly inclined from the inlet 18 towards the opposite side of the casing that is towards that side of the casing 17 which is opposite the inlet 18.
  • a sealing ring 20 extends into the central opening of the bottom 8 and thus into the annular space 16, being connected to the underside of the bottom plate 13 and being provided in the region of the channel 14 with an opening 21.
  • the direction of rotation of the inner tubular element 3 and therefore the particle distributor 9 is designated by the arrow A, in FIG. 2. It will be seen that the forward edge of the particle distributor 9 descends.
  • the term forward referring to the direction of rotation in the sense designated by the arrow A is provided with slide members 24 to form the leading edge 23 and which are in wiping contact with the screen bottom 7.
  • the channel 14 is located beneath the member 28 and delimited by the wall 25 and the wall 26. These walls extend into the region of the opening 15 of the bottom plate 13. Within the channel 14 one or more baffles 27 are provided.
  • a freely pivotable or tiltable flap 29 At the edge of the channel 14 which is the trailing edge as seen in the direction of the arrow A, is provided a freely pivotable or tiltable flap 29, and unlike the channels known from the prior art, the channel 14 of the present invention is open downwardly towards the screen bottom 7 and the housing bottom wall 8.
  • a gap 30 exists between the bottom plate 13 and the housing bottom wall 8. This gap is present in all diffusion towers of the type under discussion, and the tolerance variations for this gap are usually specified within a rather limited range. However, due to the presence of the sealing ring 20, these tolerance variations can be much greater in accordance with the present invention than in the prior-art constructions, so that the manufacture of the components involved in forming this gap is simpler and less expensive than heretofore possible.
  • the fresh mash is admitted via the conduit 31 and the inlet 18 into the annular space 16. It enters through the central opening in the housing bottom wall 8 and the cutout 15 in the bottom plate 13 into the inlet portion 14a of the channel 14.
  • the leading wall 25 delimiting the channel 14 is curved and so are the baffles 27.
  • the wall 25 and the baffles 27 guide the incoming fresh -mash to the flat 29 which deposits and distributes them onto the screen bottom 7.
  • the particle distributor 9 rotates beneath the column of material in the annular extraction chamber and because it constantly wipes the upper side of the screen bottom surface, it cleans the same and maintains it free of already partially extracted chips. so that when the fresh chips of the incoming mash are admitted onto the screen bottom 7 by the flap 29. they will always be deposited onto a free portion of the screen bottom 7 which has been cleared of other chips.
  • the flow of the mash as it enters the tower can be improved further if the inlet is arranged as a tangential inlet 18a, as shown in the further embodiment which is illustrated in FIG. 5.
  • This embodiment is analogous to the one in FIGS. l4 in most respects, and like reference numerals therefore identify like elements.
  • the cutout in the bottom plate 13 is configurated as a cutout 15a which extends tangentially with respect to the shaft 4.
  • the inlet portion 14a of the channel 14 is configurated correspondingly, and it will be evident that the flow of incoming mash is further improved by this construction.
  • the casing 17 is removable from the housing bottom 8 and can be removably connected with the same in various ways known to those skilled in the art and does therefore not require detailed description, for instance by means of bolt connections or the like.
  • the purpose of this arrangement is to simplify the installation and disassembly.
  • the fact that the lower end wall 22 of the casing is upwardly inclined in the manner described earlier as shown in FIG. 3, prevents the formation of deposits in the annular space 16.
  • a diffusion tower for extracting particulate material, particularly sugar-beet chips.
  • a combination comprising an upright outer tubular element, and a rotatable inner tubular element concentric with said outer element and defining therewith an annular extraction chamber, both of said elements having lower end regions; a screen bottom in said chamber at ssid lower end regions; a particle distributor rotatable with said inner tubular element above and in wiping contact with said screen bottom, said distributor having a channel with an open lower portion which communicates directly with said screen bottom so that particles enter ing said chamber through said channel are distributed evenly upon said previously wiped screen bottom; a bottom plate provided on said inner tubular element above said screen bottom, said bottom plate being rotatable with said inner tubular element and having a cutout which communicates with said channel; a casing at said lower end regions and defining an annular inner space which communicates with said cutout; and an inlet for particles which communicates with said inner space.
  • a combination as defined in claim 1 further comprising an upright mounting shaft for said inner tubular element, extending through said space into said lower end region and being radially and axially journalled below said space; and a shaft seal sealing said shaft with reference to said space.
  • bottom plate having a downwardly facing side; and further comprising a sealing ring on said downwardly facing side, facing into said space and being provided with an opening in the region of said channel.
  • said casing is a discrete element; further comprising a bot tom wall closing said lower end region and having a central opening; and wherein said casing is releasably connected with said bottom wall and surrounds said central opening.
  • said casing having one side at which said inlet is provided, and an opposite side, and including a lower end wall which is upwardly inclined from said one towards said other side.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Extraction Or Liquid Replacement (AREA)
  • Paper (AREA)
US392186A 1972-09-01 1973-08-28 Diffusion tower for extracting particulate material Expired - Lifetime US3880667A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2243168A DE2243168C3 (de) 1972-09-01 1972-09-01 Diffusionsturm zum Auslaugen, insbesondere von Zuckerrübenschnitzeln im Gegenstrom

Publications (1)

Publication Number Publication Date
US3880667A true US3880667A (en) 1975-04-29

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ID=5855299

Family Applications (1)

Application Number Title Priority Date Filing Date
US392186A Expired - Lifetime US3880667A (en) 1972-09-01 1973-08-28 Diffusion tower for extracting particulate material

Country Status (5)

Country Link
US (1) US3880667A (enrdf_load_stackoverflow)
AT (1) AT327123B (enrdf_load_stackoverflow)
DE (1) DE2243168C3 (enrdf_load_stackoverflow)
FR (1) FR2197631B1 (enrdf_load_stackoverflow)
YU (1) YU214373A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4115145A (en) * 1977-07-05 1978-09-19 Braunschweigische Maschinenbauanstalt Diffusion tower for sugar beet cossettes
US5653815A (en) * 1994-04-08 1997-08-05 Braunschweigische Maschinenbauanstalt Ag Process for solid-liquid extraction and extraction tower for carrying out the process

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3064494D1 (en) * 1980-09-08 1983-09-08 Heinz Schumacher Apparatus for the continuous feeding of extractors with material to be extracted and extraction material, and its use
DE4233680C1 (de) * 1992-10-07 1993-12-09 Braunschweigische Masch Bau Extraktionsturm

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2282230A (en) * 1938-01-25 1942-05-05 Johns Manville Mineral wool product and the method of making it
US2857907A (en) * 1957-02-07 1958-10-28 Braunschweigische Maschb Ansta Apparatus for extracting animal and vegetable substances
US2927007A (en) * 1957-04-17 1960-03-01 Braunschweigische Maschb Ansta Apparatus for the treatment of animal and vegetable materials
US2950998A (en) * 1956-03-01 1960-08-30 Chemetron Corp Apparatus for contacting solids with liquids
US3142589A (en) * 1962-05-16 1964-07-28 Francis C Schaffer Vertical diffuser
US3726715A (en) * 1970-06-29 1973-04-10 Braunschweigische Masch Bau Diffusion apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2282230A (en) * 1938-01-25 1942-05-05 Johns Manville Mineral wool product and the method of making it
US2950998A (en) * 1956-03-01 1960-08-30 Chemetron Corp Apparatus for contacting solids with liquids
US2857907A (en) * 1957-02-07 1958-10-28 Braunschweigische Maschb Ansta Apparatus for extracting animal and vegetable substances
US2927007A (en) * 1957-04-17 1960-03-01 Braunschweigische Maschb Ansta Apparatus for the treatment of animal and vegetable materials
US3142589A (en) * 1962-05-16 1964-07-28 Francis C Schaffer Vertical diffuser
US3726715A (en) * 1970-06-29 1973-04-10 Braunschweigische Masch Bau Diffusion apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4115145A (en) * 1977-07-05 1978-09-19 Braunschweigische Maschinenbauanstalt Diffusion tower for sugar beet cossettes
US5653815A (en) * 1994-04-08 1997-08-05 Braunschweigische Maschinenbauanstalt Ag Process for solid-liquid extraction and extraction tower for carrying out the process

Also Published As

Publication number Publication date
AT327123B (de) 1976-01-12
DE2243168A1 (de) 1974-03-07
DE2243168C3 (de) 1978-07-27
DE2243168B2 (de) 1977-12-01
FR2197631A1 (enrdf_load_stackoverflow) 1974-03-29
YU214373A (en) 1982-05-31
ATA659273A (de) 1975-03-15
FR2197631B1 (enrdf_load_stackoverflow) 1978-02-17

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Owner name: HAFTUNG, FRIED KRUPP GESELLSCHAFT MIT BESCHRANKTER

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BUKAU-WALTHER AKTIENGESELLSCHAFT;REEL/FRAME:004467/0600

Effective date: 19850918