US3809538A - Rotary countercurrent solid-liquid extraction apparatus - Google Patents

Rotary countercurrent solid-liquid extraction apparatus Download PDF

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Publication number
US3809538A
US3809538A US00157224A US15722471A US3809538A US 3809538 A US3809538 A US 3809538A US 00157224 A US00157224 A US 00157224A US 15722471 A US15722471 A US 15722471A US 3809538 A US3809538 A US 3809538A
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United States
Prior art keywords
liquid
solids
cell
solid
fraction
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Expired - Lifetime
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US00157224A
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English (en)
Inventor
G Duchateau
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Raffinerie Tirlemontoise SA
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Raffinerie Tirlemontoise SA
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    • 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
    • C13B10/105—Rotating apparatus
    • 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
    • B01D11/0269—Solid material in other moving receptacles
    • B01D11/0273—Solid material in other moving receptacles in rotating drums
    • B01D11/0276—Solid material in other moving receptacles in rotating drums with the general transport direction of the solids parallel to the rotation axis of the conveyor, e.g. spirals

Definitions

  • This invention relates to improvements in methods for extracting, by means of a liquid, products which are part of solids in a partitioned rotating extractor in which the solids on the one hand and the liquid on the other hand are divided into fractions with relative resulting lengthwide displacements along opposite directions, each liquid fraction being periodically separated from a solids fraction and said fraction then flowing toward another solids fraction.
  • An object of this invention is to obviate these drawbacks.
  • the flow of the liquid fraction separated from the solids fraction is slowed down and said liquid fraction is spread over the length and width relative to the solids fraction.
  • a further object of this is to improve the extracting devices for the working of said improved method.
  • Such devices comprise a rotating drum inside which is arranged a screw conveyor the solid windings of which define compartments for the solids fractions and the liquid fractions, said compartments being subdivided into cells which contain the solids fractions, said cells communicating for the liquid through generally axial raising elements for the solids, said elements being pervious to the liquid and extending between two succeeding windings.
  • each cell comprises a bafile for slowingdown the inlet liquid flow in said cell, which baflle is arranged as considered along the liquid movement direction in the drum, downstream of the raising element of that cell the liquid fraction flows from.
  • said bafile extends generally axially between the windings which bound the cell on the liquid inlet side of the cell, from the drum circumference over a radial distance relative to the drum axis which ie at least equal to the distance occupied in the cell by the solids and liquid fractions.
  • FIG. 1 is a diagrammatic view, with parts broken away, of a length of extracting device as described in "ice Belgian Pat. No. 475,626, along arrow A in FIG. 2, which device is provided with the improvement according to the invention.
  • FIG. 2 is a diagrammatic section view along the line BB in FIG. 1.
  • FIG. 3 is a diagrammatic plan view on a larger scale, of FIG. 2.
  • FIG. 4 is a diagrammatic view with parts broken away, of an extracting device of the type described in Belgian Pats. No. 711,219 and 728,417 along arrow C in FIG. 5, showing the improvement according to the invention.
  • FIG. 5 is a diagrammatic section view along line D-D in FIG. 4.
  • FIG. 6 is a diagrammatic plan view, on a larger scale, corresponding to FIG. 5.
  • FIG. 7 is a view similar to FIG. 2 showing another embodiment.
  • FIGS. 1 and 4 each slow a length of a device for extracting with a liquid products which are part of solids, the liquid and solids having resulting relative displacements along opposite directions.
  • Such extracting devices which are notably well known in the sugar industry, comprise in the embodiment shown in FIGS. 1 to 3, an horizontal-axis drum 1 which is rotatable along the direction of arrow 2, said drum being divided into compartments by a conveyor screw which is comprised of a series of portions of diametral solid walls 3 which are connected by portions of slanting solid walls 4.
  • the compartments are subdivided into two series of cells I, I", II, II" by solids-raising elements 5 which are previous to the liquid and comprised of perforated baskets the bottoms 6 of which are generally axial and are joined in pairs by a solid axial wall 7.
  • Two series of slants channels 8, 8' are provided in the central area of the drum 1 to direct the solids fractions raised by the baskets 5 as they pass through the lower part of the drum inside a cell of one and the same series, which is spaced along a direction opposite to the screw conveying direction, which opposite direction is shown by arrow 25, by two cells relative to a particular cell; for instance the solids fraction raised by the basket in cell II will fall in cell IV.
  • the liquid fractions separated from the solids raised by the baskets 5 each flow in the cell of the other series which, when considering the drum rotating direction, lies directly upstream of the cell the fraction leaves so as to mix with a new solids fraction with which it is conveyed along the screw conveying direction (direction opposite to the arrow 25) till the raising thereof by the basket of said other series cell; consequently the liquid fraction passing through the basket of cell II flows in cell II.
  • width and height of a solids fractions is meant the space which said fraction occupies when it lies in the drum lower part, on the one hand along the drum axial direction and on the other hand along the drum radial direction.
  • the bafiles 9 are comprised of irregularly-perforated walls which extend axially between each two succeeding walls 3 substantially in parallel relationship with the bottom 6 of the baskets 5 and radially from the drum peripheral wall over a distance at least equal to the length of the basket bottoms 6. Lengths of solid walls 11 join the bafiles 9 to the axial walls 7.
  • the ratio between the perforated area and the solid area of the walls 9 increases from the peripheral wall of the drum 1 towards the drum axis; preferably the perforation area increases with the distance from the drum peripheral wall.
  • the irregularlyperformated bafile 9 is placed by a baffle with solid portion 9 adjacent to the drum peripheral wall and followed by a chain bed 9". According to this embodiment an actual delay is introduced between the time where liquid fraction flow from a cell starts and the time where this liquid collected behind the baffle solid portion flows in the new cell.
  • FIGS. 4 to 6 which is of the type disclosed in Belgian Pats. No. 711,219 and 728,417
  • the drum rotating direction is shown by arrow 10 and the screw conveyor windings comprised of a series of cut-out solid diametral walls 11 which are joined by slanting solid walls 12, insure the conveying of the solids along the direction of arrow 13.
  • a solid axial wall 14 which extends between the succeeding walls as well as diametrically-opposed baskets 15 divide the compartments defined by the windings into two series of cells I, II, III, and I, II, III, for contacting each a solids fraction and a liquid fraction.
  • slanting liquid channels 16 are formed on the circumference of the drum 1 bet-ween the two solid walls 17 which extend the axial wall 14 and border notches 18 provided in the solid diametral walls 11.
  • Each liquid channel 16 opens (inlet) in 16a on the one hand behind (upstream) the bottom 15a of the basket 15 in each cell when considering the drum rotating direction and on the other hand in 16b in a cell of the other series which is part of the compartment removed by two units from that compartment the original cell is part of; for instance with reference to FIG. 6, the liquid fraction leaving cell III flows in cell I.
  • each cell is provided in such a case also with a bafile 19 for slowing down the flow of that liquid fraction which enters the cell in 1611.
  • Said bafile 19 which is similar to the baflles 9 described with reference to FIGS. 1 to 3 and 7, is arranged in the extension of the solid wall 17 which ends at the outlet 16b of the considered cell liquid channel 16 over substantially all of the cell width; a length of perforated wall 21 joins the bafile to the connecting line between the solid wall 17 in said cell and the winding 11 bounding said cell on the side opposite inlet 16a, while another length of perforated wall joins the high end of the bafile to the axial wall 14 at a level which corresponds substantially to the high end of the bottom 15a of that basket 15 pertaining to the opposite-series cell in the same compartment.
  • a revolving drum housing means solid walls means defining at least one solid conveyor screw means mounted in said revolving drum housing means and integral with said drum housing means;
  • said walls determining compartments for fractions of solids and for fractions of liquid
  • baffle located in at least one of said compartments adjacent to the liquid permeable solids raising means positioned in the preceding compartment, downstream of said liquid permeable solids raising means when the direction of the liquid flow is considered, and parallel to said liquid permeable solids raising means, said baffle being adapted to delay the flow of the liquid fraction and to spread the liquid fraction in relation to a new fraction of solids falling in said compartment from a liquid permeable solids raising means, which baffle extends substantially axially between two successive walls of the conveyor means and which baflle is provided with passages for the liquid, the area of said passages increasing from the drum circumference toward the drum axis.
  • said baffle comprises a solid portion adjacent to the drum housing means, followed by a portion provided with passages for the flow of the liquid.
  • said bafile comprises a solid portion adjacent to the drum housing means followed by a portion comprising a chain bed.
  • each solid conveyor means carrying a portion of the solids in an axial direction through the drum housing in a continual forward motion without intermixing or regression;
  • each solid conveyor means further including a series of successive cells for moving its respective portion of solids;
  • each solid conveyor means for feeding liquid into said revolving drum housing means at a second end of each solid conveyor means opposite to said first end and means for removing solids from said revolving drum housing means also at said second end;
  • liquid conveyor means including channels through the central partition extending substantially inward from the drum housing means and in the axial direction for passing liquid in a counter axial direction to the solids direction, each channel connecting one cell of one solid conveyor means with a successive cell in the other conveyor means, each channel extending beneath an adjacent cell in the same successive series of cells as the one cell, whereby the liquid is transmitted in two separate portions and travels twice as fast through the drum as the solid portions, the improvement according to which in at least one of said cells a baflle is provided to delay the flow of the liquid fractions entering said cell and to spread the liquid fractions in width and height with reference to the fractions of solids that falls in said cell from the raised elements;
  • said baflle extends substantially axially between successive helixes with the helical conveyor means immediately behind, when the direction of rotation of the drum is considered, of the outlet for the liquid of the channel in said cell, said bafile being located adjacent to the liquid permeable solids raising means positioned in the preceding compartment, downstream of said liquid permeable solids raising means when the direction of the liquid flow is considered, and parallel to said liquid permeable solids raising means, and
  • said bafile is provided with passages for the liquid the area of which increases from the drum housing towards the drum axis.
  • said bafile comprises a solid portion adjacent to the drum housing means, followed by a portion provided with passages for the flow of the liquid.
  • said bafile comprises a solid portion adjacent to the drum housing means followed by a portion comprising a chain bed.
  • each solid conveyor means carrying a portion of liquid in an axial direction through the drum housing in a continual forward motion without intermixing or regression;
  • a central partition extending axially through the drum housing means and having a central liquid nonpermeable portion and two liquid permeable portions situated adjacent the drum housing means for getting through the liquid, said central partition defining on each side thereof a series of successive cells for moving a respective portion of solids;
  • a baffle is provided to deay the flow of the liquid fractions entering said cells and to spread the liquid fractions in width and in height with reference to the fractions of solids which fall from the raising elements into said cells, said baffle extending substantially axially between successive helixes of the helical conveyor means immediately behind, when the direction of rotation of the drum is considered, that liquid permeable portion of the central partition which is situated in the bottom of the drum housing means when entering of the liquid into the cell is considered, said baffle furthermore being located adjacent to the liquid permeable solids raising means positioned in the preceding compartment, downstream of said liquid permeable solids raising means when the direction of the liquid flow is considered, and parallel to said liquid permeable solids raising means, and said bafile being provided with passages for the liquid, the area of said passages increasing from the drum circumference to the drum
  • said baffie comprises a solid portion adjacent to the drum housing means, followed by a portion provided with passages for the flow of the liquid.
  • said baflle comprises a solid portion adjacent to the drum housing means followed by a portion comprising a chain bed.

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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)
  • Tea And Coffee (AREA)
US00157224A 1970-07-03 1971-06-28 Rotary countercurrent solid-liquid extraction apparatus Expired - Lifetime US3809538A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
LU61261 1970-07-03

Publications (1)

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US3809538A true US3809538A (en) 1974-05-07

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ID=19726408

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US00157224A Expired - Lifetime US3809538A (en) 1970-07-03 1971-06-28 Rotary countercurrent solid-liquid extraction apparatus

Country Status (17)

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US (1) US3809538A (fr)
AT (1) AT335404B (fr)
BE (1) BE768553A (fr)
CA (1) CA952291A (fr)
CS (1) CS160681B2 (fr)
DE (1) DE2129849A1 (fr)
DK (1) DK126566B (fr)
ES (1) ES392766A1 (fr)
FR (1) FR2103665A5 (fr)
GB (1) GB1352350A (fr)
IE (1) IE35394B1 (fr)
LU (1) LU61261A1 (fr)
NL (1) NL7109055A (fr)
PL (1) PL70936B1 (fr)
RO (1) RO69440A (fr)
SU (1) SU473331A3 (fr)
ZA (1) ZA714333B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3930801A (en) * 1973-03-30 1976-01-06 "Raffinerie Tirlemontoise" Apparatus for liquid extracting of products which are part of solid materials
US4182632A (en) * 1976-09-14 1980-01-08 Cargill James M Diffuser
US4230675A (en) * 1978-02-15 1980-10-28 The United States Of America As Represented By The United States Department Of Energy Apparatus for leaching core material from clad nuclear fuel pin segments
US4289734A (en) * 1979-10-04 1981-09-15 Fives-Cail Babcock Apparatus for contacting solids with a liquid
US4311673A (en) * 1979-10-04 1982-01-19 Raffinerie Tirlemontoise Apparatus for extracting with a liquid, products which are part of solids
US6270736B1 (en) * 1999-01-21 2001-08-07 Frazier, Barnes Research Llc Identity preserved oilseed mill

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2414938A1 (fr) * 1978-01-23 1979-08-17 Genie Guy Appareil pour l'extraction au moyen d'un liquide de produits faisant partie de matieres solides
FR2431314A1 (fr) * 1978-07-18 1980-02-15 Conseils Ste Sucriere Et Perfectionnements aux appareils rotatifs de lavage et extraction a contre-courant, applicables notamment en sucrerie
PL125120B1 (en) * 1979-10-04 1983-03-31 Raffinerie Tirlemontoise Sa Apparatus for liquid extraction pf products from solid materials
LU85413A1 (fr) * 1984-06-13 1986-01-24 Abay Sa Procede et appareil pour le transfert d'energie thermique et/ou de matiere entre un liquide et une matiere solide
FR2608626B1 (fr) * 1986-12-18 1990-09-28 Raffinerie Tirlemontoise Sa Procede d'extraction de sucre par diffusion et appareil pour la mise en oeuvre de ce procede

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3930801A (en) * 1973-03-30 1976-01-06 "Raffinerie Tirlemontoise" Apparatus for liquid extracting of products which are part of solid materials
US4182632A (en) * 1976-09-14 1980-01-08 Cargill James M Diffuser
US4230675A (en) * 1978-02-15 1980-10-28 The United States Of America As Represented By The United States Department Of Energy Apparatus for leaching core material from clad nuclear fuel pin segments
US4289734A (en) * 1979-10-04 1981-09-15 Fives-Cail Babcock Apparatus for contacting solids with a liquid
US4311673A (en) * 1979-10-04 1982-01-19 Raffinerie Tirlemontoise Apparatus for extracting with a liquid, products which are part of solids
US6270736B1 (en) * 1999-01-21 2001-08-07 Frazier, Barnes Research Llc Identity preserved oilseed mill

Also Published As

Publication number Publication date
FR2103665A5 (fr) 1972-04-14
CS160681B2 (fr) 1975-03-28
DK126566B (da) 1973-07-30
LU61261A1 (fr) 1972-04-04
CA952291A (en) 1974-08-06
AT335404B (de) 1977-03-10
NL7109055A (fr) 1972-01-05
SU473331A3 (ru) 1975-06-05
ES392766A1 (es) 1973-08-01
ATA542071A (de) 1976-07-15
DE2129849A1 (de) 1972-01-13
IE35394L (en) 1972-01-03
IE35394B1 (en) 1976-02-04
PL70936B1 (fr) 1974-04-30
BE768553A (fr) 1971-12-15
RO69440A (fr) 1982-05-10
GB1352350A (en) 1974-05-08
ZA714333B (en) 1972-04-26

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