WO2000011957A1 - Mixer - Google Patents

Mixer Download PDF

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Publication number
WO2000011957A1
WO2000011957A1 PCT/SE1999/001458 SE9901458W WO0011957A1 WO 2000011957 A1 WO2000011957 A1 WO 2000011957A1 SE 9901458 W SE9901458 W SE 9901458W WO 0011957 A1 WO0011957 A1 WO 0011957A1
Authority
WO
WIPO (PCT)
Prior art keywords
reaction vessel
feeding
mixing
mixer
reaction
Prior art date
Application number
PCT/SE1999/001458
Other languages
French (fr)
Inventor
Bengt Hansson
Original Assignee
Biowheat Ab
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 Biowheat Ab filed Critical Biowheat Ab
Priority to AU58915/99A priority Critical patent/AU5891599A/en
Publication of WO2000011957A1 publication Critical patent/WO2000011957A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B30/00—Preparation of starch, degraded or non-chemically modified starch, amylose, or amylopectin
    • C08B30/12—Degraded, destructured or non-chemically modified starch, e.g. mechanically, enzymatically or by irradiation; Bleaching of starch
    • C08B30/16—Apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/53—Mixing liquids with solids using driven stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/91—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with propellers

Definitions

  • the present invention relates to a mixer for mixing and starting a starch hydrolysis reaction starting from cereal raw material, water and starch hydrolysing enzymes.
  • the object of the present invention is to obtain an efficient mixture of cereal raw material, water, and starch hydrolysing enzymes while avoiding formation of lumps of cereal raw material, uneven hydrolysis and gelatinization, under environmentally acceptable conditions.
  • starch hydrolysing enzymes such as alpha-amylase and amyloglucosidase
  • protein decomposing enzymes such as proteases of different types.
  • the process thereby comprises slurrying of the cereal raw material in water to a dry substance contents of 20 to 50%, addition of different enzymes, heating of the raw materials mixture, normally to 50 to 80°C, for carrying out the hydrolysis reaction, heating to deactivate the enzymes present, isolation of the reaction product, optionally in a combination with elimination of water.
  • the cereal raw material most often crushed cereal grains, or preferably meal, is added via a dosing from a silo to a mixer, wherein water and enzymes are added, whereby the water often is present at an elevated temperature.
  • This elevated temperature creates problems, in particular when one wants to operate at a considerably elevated temperature, in order to obtain a rapid gelatinization and starting up of the hydrolysis reaction. It has thereby turned out that common mixing apparatuses and methods create a problem at the feeding of the meal by forming lumps in the reaction mixture, by the thereby obtained uneven gelatinization with an accompanying prolonged reaction course, in the working hygienic conditions by discharging enzyme enriched dust or steam.
  • the reaction product is most often a starch syrup, as one preferably uses a starch hydrolysis, which reaction product/end product can be used a replacement and additive in, in particular, the bakery industry.
  • a dosing apparatus comprising a counter pressure fan
  • a reaction vessel provided with a tube for feeding water and placed below the product level in the reaction vessel, and a tube for feeding enzymes placed above the product level in the reaction vessel
  • a mixing unit comprising mixing propellers having on one hand a down feeding function close to the cetre shaft of the mixing unit, on the other hand upwardly feeding function for an intense stirring in said reaction vessel, and d) an outlet for taking out reaction mixture obtained in the mixer.
  • FIG. 1 shows a mixing device according to the invention in a schematic side view.
  • the reaction vessel 7 comprises a stirrer 8 which is operated by a motor (schematically shown) placed above the reaction vessel 7.
  • An inlet tube 9 for the addition of water is arranged to the lower part of the reaction vessel 7, while an inlet tube 10 for a solution containing enzymes is arranged to the upper part of the reaction vessel.
  • the stirrer 8 in the reaction vessel 7 comprises a package of blades 12 for mixing and a propeller 13 at the outlet 11, which propeller 13 comprises wing planes which are parallel to the shaft and suitably pass through the centre line of the shaft which wings end shortly inside a perforated ring through which the reaction mixture is intended to leave the reaction vessel via the outlet 11.
  • the ring brings about that no essential lumps of meal is able to leave the reaction vessel 7.
  • the package of blades 12 comprises three propellers 14, of which the upper two are larger and operate by pumping the product downwardly near the shaft and the third, which is smaller, has a contrary function. Thereby it is obtained an intense stirring in the upper part of the reaction vessel 7 before the reaction mixture comes close to the outlet.
  • the reaction vessel further comprises, in its cylindrical part, longitudinally extending baffles to increase the stirring effect.
  • the mixer is intended for a continuous preparation of a reaction mixture.
  • meal is added from a silo (not shown) through the dosage apparatus, suitably using several parallel feeding screws 1 operating with a volumetric dosage.
  • a continuous control using sensors, that the space in the inlet to the dosage apparatus 2 is filled up. If this is not the case, a shaking down of the meal is obtained by means of a vibrator arranged in the silo. From the end of the feeding screw the meal falls using a continuous vibration 4 through the shaft to the reaction vessel 7.
  • a fan 3 In order to prevent moist air to arrive through the shaft, and thereby risk that the meal clogs in the shaft air is blown by a fan 3 using a low flow down through the shaft. This air leaves the reaction vessel 7 via a venting tube (not shown).
  • Water having a temperature of 80-100°C, suitably 90°C, is added in a determined amount to the reaction vessel 7 by being injected beneath the level present in the reaction vessel 7 through the inlet tube 9.
  • 80-100°C suitably 90°C

Abstract

The present invention relates to a mixer for mixing and starting a starch hydrolysis reaction starting from cereal raw material, water and starch hydrolysing enzymes, whereby it comprises a) a dosing apparatus (2) comprising a counter pressure fan (3), b) a reaction vessel (7) provided with a tube (9) for feeding water and placed below the product level in the reaction vessel (7), and a tube (10) for feeding enzymes and placed above the product level in the reaction vessel (7), c) a mixing unit comprising mixing propellers (14) having on one hand a down feeding function close to the centre shaft of the mixing unit, on the other hand upwardly feeding function for an intense stirring in said reaction vessel (7), and d) an outlet (11) for taking out reaction mixture obtained in the mixer.

Description

TITLE MIXER
DESCRIPTION Technical field
The present invention relates to a mixer for mixing and starting a starch hydrolysis reaction starting from cereal raw material, water and starch hydrolysing enzymes.
The object of the present invention is to obtain an efficient mixture of cereal raw material, water, and starch hydrolysing enzymes while avoiding formation of lumps of cereal raw material, uneven hydrolysis and gelatinization, under environmentally acceptable conditions.
Background of the invention It is previously known to hydrolyse cereals by means of on one hand starch hydrolysing enzymes, such as alpha-amylase and amyloglucosidase, on the other hand protein decomposing enzymes, such as proteases of different types. Generally, the process thereby comprises slurrying of the cereal raw material in water to a dry substance contents of 20 to 50%, addition of different enzymes, heating of the raw materials mixture, normally to 50 to 80°C, for carrying out the hydrolysis reaction, heating to deactivate the enzymes present, isolation of the reaction product, optionally in a combination with elimination of water.
The cereal raw material, most often crushed cereal grains, or preferably meal, is added via a dosing from a silo to a mixer, wherein water and enzymes are added, whereby the water often is present at an elevated temperature. This elevated temperature, however, creates problems, in particular when one wants to operate at a considerably elevated temperature, in order to obtain a rapid gelatinization and starting up of the hydrolysis reaction. It has thereby turned out that common mixing apparatuses and methods create a problem at the feeding of the meal by forming lumps in the reaction mixture, by the thereby obtained uneven gelatinization with an accompanying prolonged reaction course, in the working hygienic conditions by discharging enzyme enriched dust or steam.
The reaction product is most often a starch syrup, as one preferably uses a starch hydrolysis, which reaction product/end product can be used a replacement and additive in, in particular, the bakery industry.
Description of the present invention It has now turned out possible to eliminate these problems by means of the present invention which is characterized in that it comprises a) a dosing apparatus comprising a counter pressure fan, b) a reaction vessel provided with a tube for feeding water and placed below the product level in the reaction vessel, and a tube for feeding enzymes placed above the product level in the reaction vessel, c) a mixing unit comprising mixing propellers having on one hand a down feeding function close to the cetre shaft of the mixing unit, on the other hand upwardly feeding function for an intense stirring in said reaction vessel, and d) an outlet for taking out reaction mixture obtained in the mixer.
Further characteristics will be evident from the accompanying claims.
By means of the present invention there is obtained a rapid hydrolysis under completely operational safe conditions and under observing the working environmental problems.
The invention will now be described more in detail in the following with reference to a preferred embodying example, however, without being restricted thereto, and with reference to the accompanying drawing, wherein FIG. 1 shows a mixing device according to the invention in a schematic side view.
1 denotes a feeding screw which transports meal of wheat, rye, barley, oat, maize, rice, sorghum and/or other cereal raw material from a silo (not shown) to a dosage apparatus 2 comprising a fan 3, a vibration device 4, and a soft connection 5 to an inlet joint 6 of a reaction vessel 7. The reaction vessel 7 comprises a stirrer 8 which is operated by a motor (schematically shown) placed above the reaction vessel 7. An inlet tube 9 for the addition of water is arranged to the lower part of the reaction vessel 7, while an inlet tube 10 for a solution containing enzymes is arranged to the upper part of the reaction vessel. In the bottom of the reaction vessel 7 there is an outlet 11 for removing a reaction mixture produced in the reaction vessel 7.
The stirrer 8 in the reaction vessel 7 comprises a package of blades 12 for mixing and a propeller 13 at the outlet 11, which propeller 13 comprises wing planes which are parallel to the shaft and suitably pass through the centre line of the shaft which wings end shortly inside a perforated ring through which the reaction mixture is intended to leave the reaction vessel via the outlet 11. The ring brings about that no essential lumps of meal is able to leave the reaction vessel 7. The package of blades 12 comprises three propellers 14, of which the upper two are larger and operate by pumping the product downwardly near the shaft and the third, which is smaller, has a contrary function. Thereby it is obtained an intense stirring in the upper part of the reaction vessel 7 before the reaction mixture comes close to the outlet. The reaction vessel further comprises, in its cylindrical part, longitudinally extending baffles to increase the stirring effect.
The mixer is intended for a continuous preparation of a reaction mixture. Hereby, meal is added from a silo (not shown) through the dosage apparatus, suitably using several parallel feeding screws 1 operating with a volumetric dosage. In order to certify the addition of meal to the feeding screw 1 there is a continuous control using sensors, that the space in the inlet to the dosage apparatus 2 is filled up. If this is not the case, a shaking down of the meal is obtained by means of a vibrator arranged in the silo. From the end of the feeding screw the meal falls using a continuous vibration 4 through the shaft to the reaction vessel 7. In order to prevent moist air to arrive through the shaft, and thereby risk that the meal clogs in the shaft air is blown by a fan 3 using a low flow down through the shaft. This air leaves the reaction vessel 7 via a venting tube (not shown).
Water having a temperature of 80-100°C, suitably 90°C, is added in a determined amount to the reaction vessel 7 by being injected beneath the level present in the reaction vessel 7 through the inlet tube 9. Hereby, heat and water losses through the shaft ventilation are minimized, as well as enzymatic material accompanying such a water loss.
An addition of a solution of enzymes using a dosage pump (not shown) is made over the level present in the reaction mixture 7 via an inlet tube 10. In the reaction vessel 7 there is then obtained an intense stirring which has been given above, whereby gelatinization is initiated as well as starch hydrolysis. Gelatinization and complete hydrolysis, or hydrolysis to a desired degree are then carried out in a final reaction vessel. Such a final reaction, prior to deactivation of the ingoing enzymes, takes, in the present process normally about 1 hr. Deactivation is carried out by hating the reaction product to 97-98°C for 2 min.

Claims

1. Mixer for mixing and starting a starch hydrolysis reaction starting from cereal raw material, water and starch hydrolysing enzymes, characterized in that it comprises a) a dosing apparatus (2) comprising a counter pressure fan (3), b) a reaction vessel (7) provided with a tube (9) for feeding water and placed below the product level in the reaction vessel (7), and a tube (10) for feeding enzymes and placed above the product level in the reaction vessel (7), c) a mixing unit comprising mixing propellers (14) having on one hand a down feeding function close to the cetre shaft of the mixing unit, on the other hand upwardly feeding function for an intense stirring in said reaction vessel (7), and d) an outlet (11) for taking out reaction mixture obtained in the mixer.
2. Mixer according to claim 1, characterized in that the outlet comprises a perforated ring through which the reaction mixture obtained is pressed by means of a blade propeller (13).
PCT/SE1999/001458 1998-08-27 1999-08-26 Mixer WO2000011957A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU58915/99A AU5891599A (en) 1998-08-27 1999-08-26 Mixer

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9802865A SE512559C2 (en) 1998-08-27 1998-08-27 Mixer for mixing cereal raw material, water and starch hydrolyzing enzymes
SE9802865-7 1998-08-27

Publications (1)

Publication Number Publication Date
WO2000011957A1 true WO2000011957A1 (en) 2000-03-09

Family

ID=20412371

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1999/001458 WO2000011957A1 (en) 1998-08-27 1999-08-26 Mixer

Country Status (3)

Country Link
AU (1) AU5891599A (en)
SE (1) SE512559C2 (en)
WO (1) WO2000011957A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100431517B1 (en) * 2001-12-22 2004-05-22 강희승 Mixing Device
DE102007011409A1 (en) * 2007-03-08 2008-09-11 Bvg Bauer Verfahrenstechnik Gmbh Process for the continuous production of degraded starch paste and plant for carrying out such a process
EP2586317A1 (en) * 2005-03-08 2013-05-01 Wahl Process Systems AS Hydrolysis process for raw materials from the fishing and slaughterhouse industries and tanks for use therein
ES2613303A1 (en) * 2015-11-20 2017-05-23 It Food Processing machine of compound products based on mixtures, and procedure of such processing (Machine-translation by Google Translate, not legally binding)
CN108579557A (en) * 2018-02-01 2018-09-28 北京天仪百康科贸有限公司 A kind of flocculant hydrolysis device for sewage disposal
CN108929845A (en) * 2018-07-18 2018-12-04 南昌大学 A kind of more materials are stirred hydrolysis device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5378286A (en) * 1990-02-20 1995-01-03 A. E. Staley Manufacturing Co. Method of preparing reduced fat foods

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5378286A (en) * 1990-02-20 1995-01-03 A. E. Staley Manufacturing Co. Method of preparing reduced fat foods

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100431517B1 (en) * 2001-12-22 2004-05-22 강희승 Mixing Device
EP2586317A1 (en) * 2005-03-08 2013-05-01 Wahl Process Systems AS Hydrolysis process for raw materials from the fishing and slaughterhouse industries and tanks for use therein
DE102007011409A1 (en) * 2007-03-08 2008-09-11 Bvg Bauer Verfahrenstechnik Gmbh Process for the continuous production of degraded starch paste and plant for carrying out such a process
DE102007011409B4 (en) * 2007-03-08 2010-02-18 Bvg Bauer Verfahrenstechnik Gmbh Process for the continuous production of degraded starch paste and plant for carrying out such a process
ES2613303A1 (en) * 2015-11-20 2017-05-23 It Food Processing machine of compound products based on mixtures, and procedure of such processing (Machine-translation by Google Translate, not legally binding)
WO2017085346A1 (en) * 2015-11-20 2017-05-26 It Food Machine for processing mixture-based compound products and processing method
CN108579557A (en) * 2018-02-01 2018-09-28 北京天仪百康科贸有限公司 A kind of flocculant hydrolysis device for sewage disposal
CN108929845A (en) * 2018-07-18 2018-12-04 南昌大学 A kind of more materials are stirred hydrolysis device

Also Published As

Publication number Publication date
SE9802865L (en) 2000-02-28
AU5891599A (en) 2000-03-21
SE9802865D0 (en) 1998-08-27
SE512559C2 (en) 2000-04-03

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