EP0707078B1 - New canejuice displacement process - Google Patents

New canejuice displacement process Download PDF

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Publication number
EP0707078B1
EP0707078B1 EP19940402832 EP94402832A EP0707078B1 EP 0707078 B1 EP0707078 B1 EP 0707078B1 EP 19940402832 EP19940402832 EP 19940402832 EP 94402832 A EP94402832 A EP 94402832A EP 0707078 B1 EP0707078 B1 EP 0707078B1
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EP
European Patent Office
Prior art keywords
juice
stage
displacement
cane
stages
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.)
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Application number
EP19940402832
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German (de)
English (en)
French (fr)
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EP0707078A1 (en
Inventor
Maxime Rivière
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.)
RIVIERE, MICHELE MARCELLE AMELIE, NEE PAYET
Original Assignee
Riviere Michele Marcelle Amelie Nee Payet
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    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B10/00—Production of sugar juices
    • C13B10/02—Expressing juice from sugar cane or similar material, e.g. sorghum saccharatum
    • C—CHEMISTRY; METALLURGY
    • C13—SUGAR INDUSTRY
    • C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
    • C13B10/00—Production of sugar juices
    • C13B10/02—Expressing juice from sugar cane or similar material, e.g. sorghum saccharatum
    • C13B10/04—Expressing juice from sugar cane or similar material, e.g. sorghum saccharatum combined with imbibition

Definitions

  • the first step is to open the juice containing cells so that the extractable juice of cane be readily available for leaching or displacement.
  • 80 to 84 % of the extractable juice % cane (1) can be extracted by dry pressure in a mill.
  • Sugar (Pol) extraction is from 60 to 80 %.
  • imbibition have to be resorted to. The aim of imbibition is to dilute the extractable juice of cane before the final juice extraction by pressure.
  • n° 1 mill bagasse is processed in a counter-current multistage dilution process. In each stage, two separate operations take place :
  • stage efficiency (as measured by the Murphree criterion (2) is surprisingly low for an industrial process (25 to 35 %)
  • stage efficiency in diffusion is not any better than in milling.
  • the number of stages used which should be between 4 and 7 (depending on the imbibition rate) assuming 100 % efficient mixing, is between 15 to 18 (so that the stage efficiency is between 4/15 (26.7 %) to 7/18 (38.9 %)
  • FR-A-2 278 767 discloses process and apparatus for the extraction by diffusion of sugar cane facilitating juice extraction frame the fibres by air displacement.
  • the bulk density may vary from 250 to 350 Kg/cubic meter.
  • the upper layer of shredded cane (0.5 meter) probably has the same composition as measured in the above experiments. But, due to compaction, specially in the bottom layer of shredded cane, the bulk density is probably two to three times higher.
  • the average bulk density (counted on cane only) is between 500 to 600 Kg cubic meter. Which means that the average apparent volume occupied by one ton of cane must be between 1.67 to 2 cubic meters. Deducting the no void volume of cane, this leaves a void volume of between 0.78 to 1.11 cubic meter. The filling of this void volume of with 1.05 density juice will require 819 Kg to 1.655 Kg of juice.
  • the object of the present patent is to make the cane juice displacement process efficient by resorting to "meichage" in a continuous cane juice extraction equipment.
  • the target of 4 brix of juice in the final megasse (corresponding to a Pol extraction rate of 98 %, assuming a final dewatering giving a juice content of the bagasse of 0.64 F) is reached in three stages.
  • the amount of "meichage" juice needed to completely fill the voids between the cane shred is 15 F, giving an initial total juice content of the megasse in the first stage of 20 F at 15.4 brix, using as meichage juice 15 F at the same brix (14.3) as in mixed juice leaving the Irst stage.
  • the juice content of the megasse (after displacement,it contains 20 F of juice at an average brix of 13.15) is drained by gravity in a receiver tank, down to a juice content of 6 F in the megasse leaving the first stage.
  • the amount of drainage juice would be 14 F at a brix of 13.72.
  • This juice has to be recirculated as "meichage” juice together with 1 F of the displaced juice (7.36) with a mixed brix of 14.3, leaving 6.36 F at 14.3 brix as juice extracted from the first stage to match the overall balance :
  • the meichage juice (14 F) will be supplied by the drainage juice with a mixed brix of 5.7
  • the dewatering mill juice (5.36 F) will be used as displacement juice, followed by imbibition water 2 F
  • the brix of the displaced juice (7.36 F) will be 6.22
  • a conventional horizontal drag type conveyor can be used to move the prepared cane delivered by the shredder to the dewatering mill.
  • the speed of the conveyor (approximately 20 meter/minute) is set according to the cane flow so that a layer of about 0,3 meter is moved along, over the perforated bottom (1) of the conveyor.
  • the conveyor has a closed double bottom (2) with compartments and piping to comply with the flow diagram in each of the 3 stages.
  • “Meichage” juice is supplied from tank 8 by a variable speed pump (3) at a rate of 15 or 14 F (as required in each stage) at a controlled pressure, monitored by the level of juice that will just cover the surface of the mat of cane leaving the meichage part of the conveyor.
  • the discharge pipe of the displacement section of the double bottom is controlled by an automatic valve (6) to keep the level of juice just above the surface of the cane bed.
  • the displaced juice is discharged in tank (8)
  • the double bottom of the drainage section, in each stage, is connected to the discharge tank (8) through pipe (7) , fitted at the bottom with automatic valve (6) .
  • This valve is monitored by the level of juice in the cane mat, so that the draining pipe is always kept full of juice.
  • the megasse is discharged from the last section of the displacement conveyor into the chute (9) feeding the preextractor (PE)
  • the preextractor consists in conventional 4 roller mill from which the trash plate and the delivery roll have been removed. It is a tilted 3 roller mill set to remove half of the juice content (6 F) of the megasse.
  • the bagasse coming out of the preextractor is conveyed by a closed chute (Meinecke chute) (C) to the bottom of the conventional bagasse elevator (E) feeding the (Donelly) chute of the final dewatering mill (DWM) which is a conventional 4 roller mill receiving the usual juice content (3 F) consisting, in a conventional milling tandem of the juice content (IF) of the second last mill bagasse and of the imbibition water (2 F) added in front of the last mill.
  • C closed chute
  • E bagasse elevator
  • DWM final dewatering mill
  • the dewatering juice coming from the preextractor (3 F) and the final dewatering mill (2.36 F) are pumped at the rate of 5.36 F to the displacement juice trough (5) of the third stage by pump (10).
  • displacement juice from the third stage is pumped from tank 8 by pump (10) to the displacement juice trough (5) of the second stage.
  • Displacement juice for n° 1 stage is pumped from 2nd stage tank (8) by pump (10) to N° 1 stage displacement juice trough.
  • the juice extracted from the plant overflows from receiving tank (8) of the first stage into a pump feed tank (11) from which it is pumped at the rate of 6.36 F as mixed juice to the process.
  • the level of juice in the receiving tank (8) in each stage must be at least 2 meters, and preferably between 3 to 4 meters lower than the level of juice in the conveyor (top of the cane bed).
  • the conventional drag type conveyor can be used for juice extraction by the displacement process, only up to a capacity of 5/6000 tons of cane per day, because of the following limitations :
  • the displacement process can only be performed efficiently when the juice content of the megasse is at least 20 times the fiber content of the cane - which means that the fiber content of the megasse must be less than 1/20 or 5 %.
  • megasse has the hydrodynamic characteristics of a liquid.
  • the juice content of the megasse remains 20 F, the displaced thick juice at the bottom being replaced on top by an equal amount of thin displacement juice (or water). So, in the displacement section, the megasse is still flowing freely by gravity.
  • This drum serves two purposes :
  • the last function is performed by spikes (0.3 to 0.5 meter long) (5) welded on a perforated drum (2 to 3 meters in diameter) along 12 generating lines. Each row (with spikes 50 m/m apart) will act as a fork to move the megasse towards the discharge section while allowing the juice to drip through, to achieve drainage.
  • the diameter of the drum, length of the spikes and speed (1 to 2 RPM) are chosen to suit the desired escribed volume.
  • the scraping action is performed by a scraper plate (6) welded on the tip of the spikes along each row.
  • the perforated bottom being kept clean, the displacement juice can move down accross the flow of megasse.
  • Displacement juice is admitted inside the perforated drum, above the displacement section.
  • the perforated drum is open at each end.
  • a thick steel disk is welded inside the perforated drum, half way between the ends. This disc is welded to a hub, wedged to the shaft.
  • the drum is driven by a hydraulic or electric variable speed motor, at a speed of 1 to 2 RPM.
  • Displacement juice can be admitted inside the perforated drum (in a distribution box (7) from each end, through the flanges from an outside box in which the level of juice can be controlled so that no air is admitted. In this way, displacement juice, uniformly distributed over the megasse in the displacement section, can flow across and collect into the double bottom, from which it drains to the receiving tank below.
  • the flow of displaced juice is controlled by an automatic valve on the discharge pipe monitored by the level in juice box (8)
  • Drained megasse is discharged by gravity at an angle of 60 degrees, to the feed side of the next stage.
  • meichage juice from the next stage is admitted into distribution box (10) , through the flanges on each side.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Organic Chemistry (AREA)
  • Non-Alcoholic Beverages (AREA)
EP19940402832 1994-09-26 1994-12-09 New canejuice displacement process Expired - Lifetime EP0707078B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AU7419594 1994-09-26
AU74195/94 1994-09-26
AU74195/94A AU679255B2 (en) 1994-09-26 1994-09-26 New cane juice displacement process

Publications (2)

Publication Number Publication Date
EP0707078A1 EP0707078A1 (en) 1996-04-17
EP0707078B1 true EP0707078B1 (en) 2004-02-25

Family

ID=3756147

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940402832 Expired - Lifetime EP0707078B1 (en) 1994-09-26 1994-12-09 New canejuice displacement process

Country Status (5)

Country Link
EP (1) EP0707078B1 (pt)
AU (1) AU679255B2 (pt)
BR (1) BR9404596A (pt)
DE (1) DE69433575T2 (pt)
DK (1) DK0707078T3 (pt)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5772775A (en) * 1995-10-24 1998-06-30 Riviere; Michele Marcelle Amelie Method of extraction of juice from sugar cane
CN1089809C (zh) * 1996-12-30 2002-08-28 米歇尔·马塞勒·阿梅利·里维埃 萃取甘蔗汁液的方法及装置
BRPI0900946A8 (pt) * 2009-04-17 2017-05-16 Empral Desenvolvimento De Equipamentos Ltda Difusor horizontal com sistema de deslocamento da cana-de-açúcar e outros produtos por meio de cabos e empurradores retráteis

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1143640A (pt) *
AT260831B (de) * 1965-06-04 1968-03-25 Braunschweigische Maschb Ansta Verfahren und Vorrichtung zur kontinuierlichen Gegenstrom-Extraktion des Zuckers aus Bagasse
FR2050660A5 (en) * 1969-06-20 1971-04-02 Fives Lille Cail Sugar extraction from sugar cane
FR2278767A1 (fr) * 1974-04-11 1976-02-13 Fives Cail Babcock Procede et installation pour l'extraction par diffusion du sucre de la bagasse de canne a sucre
FR2310409A2 (fr) * 1975-05-09 1976-12-03 Fives Cail Babcock Procede et installation pour l'extraction par diffusion du sucre de la bagasse de canne a sucre
FR2477177A2 (fr) * 1980-02-29 1981-09-04 Fives Cail Babcock Installation pour l'extraction par diffusion du sucre de la bagasse de canne a sucre
FR2507621A1 (fr) * 1981-06-12 1982-12-17 Rech Geolog Miniere Procede d'extraction des matieres solubles des cannes a sucre et appareil de mise en oeuvre
MX166939B (es) * 1989-04-21 1993-02-15 Biotecnologia Y Derivados De M Sistema mejorado de baja presion para la extraccion de solubles de materia fibrosa

Also Published As

Publication number Publication date
DE69433575T2 (de) 2005-03-31
EP0707078A1 (en) 1996-04-17
DK0707078T3 (da) 2004-06-28
AU7419594A (en) 1996-04-18
DE69433575D1 (de) 2004-04-01
AU679255B2 (en) 1997-06-26
BR9404596A (pt) 1995-08-01

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