WO1992011409A1 - Procede d'alimentation de cuiseurs continus sous pression pour l'obtention de pates cellulosiques - Google Patents
Procede d'alimentation de cuiseurs continus sous pression pour l'obtention de pates cellulosiques Download PDFInfo
- Publication number
- WO1992011409A1 WO1992011409A1 PCT/FR1991/000986 FR9100986W WO9211409A1 WO 1992011409 A1 WO1992011409 A1 WO 1992011409A1 FR 9100986 W FR9100986 W FR 9100986W WO 9211409 A1 WO9211409 A1 WO 9211409A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cooker
- valve
- pressure
- pump
- plug
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C1/00—Pretreatment of the finely-divided materials before digesting
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C7/00—Digesters
- D21C7/06—Feeding devices
Definitions
- the present invention relates to a process for the preparation of cellulosic pastes by cooking lignocellulosic materials, such as wood chips or annual plants, in a continuous pressure cooking reactor and more particularly to a process for supply to said reactor.
- the feeding systems currently used are for the most part of the following types, a - For annual plants: Continuous screws with variable or frustoconical pitch, fitted at the end with a back-pressure system.
- the system makes it possible to prevent the material from being discharged by the vapor pressure prevailing inside the cooker, generally of the order of 7 bars.
- These screws have drawbacks, namely rapid wear due to the presence of silica in the plants used (bagasse, kenaf, straw, hemp, etc.), which necessitates a frequent change of screws which must be recharged with metal and, for certain plants (in particular wet straw), a difficulty in ensuring a regular flow because the material tends to rotate with the screw and no longer.
- the systems used are of the airlock or rotary valve type. These devices operate in the following cycle. 1. A certain quantity of chips is introduced into a volume at atmospheric pressure.
- the volume is closed and subjected to a vapor pressure equal to that of the cooker.
- the volume is opened towards the cooker and the chips are poured there.
- the volume is then ready to receive a new chip load.
- Such systems have drawbacks because they are discontinuous and consequently disturb the operation of the cooker and cause a pressure drop at each cycle.
- the proposed system can be used both for annual plants and for wood chips. It is particularly well suited to continuous processes and in particular to the two-step process, as described in the French utility certificate n ° 2542 021 (see also European patent n ° 0 136 325 and American patent n ° 4 790 905).
- the continuous cooker feeding process for obtaining cellulosic pulp according to the present invention is characterized in that one introduces into a piston pump with an open cylinder head which re ⁇ flows in a piping connected to the cooker of ignocellulosic materials. 'such as wood shavings or annual plants, impregnated beforehand with chemical reagents in a quantity just necessary for their cooking and with water in sufficient quantity to obtain a pasty but non-liquid consistency.
- the seal of the cooker is ensured by a plug of material impregnated in the supply piping, which therefore does not include a valve or a sealing valve.
- the impregnation at the heart of the lignocellulose material is ensured in two phases: a) mixing of the impregnation liquor and the lignocellulose materials in proportions necessary for cooking by conventional agitation, and b) subjecting this mixture during introduction into the cooker to a high pressure, preferably of the order of 80 bars, by pressure using the piston pump with open cylinder head, which forces the penetration of the impregnation liquor at the heart of the lignocellulosic material.
- the first step of the process is impregnation, for example described in the aforementioned patents.
- the annual plant is torn to pieces of 5 to 10 cm, for example. Then it is added with hot water and alkaline or alkaline earth reagents necessary for cooking to obtain the desired quality of dough.
- these are immersed hot in a solution of alkaline or alkaline-earth reagents of a given concentration for a time sufficient to absorb in the co ⁇ skin the quantity of reagents necessary for its cooking. Then the skins are drained.
- a liquor impregnation / dry matter ratio (LI / MS) preferably equal to or close to 1.5, which can also vary according to the nature of the raw material used from 0.8 to 3.
- the second phase of the process includes injection.
- the impregnated material is injected under pressure by the open cylinder head piston pump 2 into the piping 3 connected to the cooker 1 provided with a double jacket heated by means of steam.
- the piston pump can be a double body, each piston working alternately so as to create an almost continuous or single-body flow.
- the piping 3 between the outlet of the pump and the inlet of the cooking reactor must be of a length and diameter such that the pressure drop created, thanks to the formation of a plug 4 resulting from the compression action of the pump piston, greater than the internal pressure of the reactor.
- the length of the pipe 3 and its diameter can be 3 to 3 m and 200 to 300 mm respectively.
- this flange is bolted tightly and the temperature of the cooker is adjusted to 170 ° C. by vapor pressure at 7 bars.
- the piping connecting the pump to the cooker does not have any valve or valve.
- the plug of compressed material in the supply tube is perfectly sealed.
- Example 2 The procedure is as in the previous example, using uncut barley straw in the form of 30 kg bales.
- bales of straw i.e. 300 kg soda powder 40 kg anhydrous soda ash powder 12 kg hot water spray 470 kg
- the product obtained is homogeneous and has the appearance of a wet straw.
- the impregnated straw is introduced into the cooker whose pressure is 7 bars, the duration of the introduction being
- Example 3 280 kg of ABL SALIGNA Eucalyptus 12 shavings at 92% dryness, placed in a stainless steel basket perforated with holes, are immersed in a sodium hydroxide solution containing 102.4 g / l of NaOH at 100 ° C for 30 minutes. * The chips 2.5 mm thick and 2 cm long are then removed from the solution and drained for 5 minutes. The weight of chips after impregnation is 580 kg. Using the same equipment as before, these chips are pushed into the experimental cooker whose internal pressure is 7 bars and the temperature of 170 ° C. The tube connecting the outlet of the pump to the inlet of the cooker has a length of 6 m and a diameter of 200 mm.
Landscapes
- Paper (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Noodles (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE69118919T DE69118919T2 (de) | 1990-12-17 | 1991-12-09 | Verfahren zur zuführung von kontinuierlichen hochdruckkochern um zellstoff zu bekommen |
EP92901780A EP0570385B1 (fr) | 1990-12-17 | 1991-12-09 | Procede d'alimentation de cuiseurs continus sous pression pour l'obtention de pates cellulosiques |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9015759A FR2670512A1 (fr) | 1990-12-17 | 1990-12-17 | Systeme d'alimentation en plantes annuelles ou copeaux de bois pour un reacteur de cuisson continu sous pression destine a la production de pate cellulosique. |
FR90/15759 | 1990-12-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992011409A1 true WO1992011409A1 (fr) | 1992-07-09 |
Family
ID=9403304
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1991/000986 WO1992011409A1 (fr) | 1990-12-17 | 1991-12-09 | Procede d'alimentation de cuiseurs continus sous pression pour l'obtention de pates cellulosiques |
Country Status (9)
Country | Link |
---|---|
US (1) | US5478439A (fr) |
EP (1) | EP0570385B1 (fr) |
CN (1) | CN1064117A (fr) |
AU (1) | AU9128291A (fr) |
CA (1) | CA2098493A1 (fr) |
DE (1) | DE69118919T2 (fr) |
ES (1) | ES2089490T3 (fr) |
FR (1) | FR2670512A1 (fr) |
WO (1) | WO1992011409A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000052256A1 (fr) * | 1999-03-02 | 2000-09-08 | Andritz Inc. | Preconditionnement de l'alimentation pour reduction en pate chimique |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6106668A (en) * | 1996-10-25 | 2000-08-22 | Ahlstrom Machinery Inc. | Method for feeding comminuted fibrous material |
US5753075A (en) * | 1996-10-25 | 1998-05-19 | Stromberg; C. Bertil | Method and system for feeding comminuted fibrous material |
FI120547B (fi) * | 2004-10-04 | 2009-11-30 | Metso Paper Inc | Alkalinen keittomenetelmä ja laitteisto massan valmistamiseksi |
US7815741B2 (en) | 2006-11-03 | 2010-10-19 | Olson David A | Reactor pump for catalyzed hydrolytic splitting of cellulose |
US7815876B2 (en) * | 2006-11-03 | 2010-10-19 | Olson David A | Reactor pump for catalyzed hydrolytic splitting of cellulose |
SE530744C2 (sv) * | 2007-02-23 | 2008-09-02 | Metso Fiber Karlstad Ab | Ångfaskokare samt ett förfarande vid kontinuerlig kokning |
SE532060C2 (sv) * | 2008-03-20 | 2009-10-13 | Metso Fiber Karlstad Ab | Matningssystem innefattande parallella pumpar för en kontinuerlig kokare |
CN104047195A (zh) * | 2009-01-13 | 2014-09-17 | 拜格索有限公司 | 用于从生物质材料制备生物产品的设备和方法 |
TWI392544B (zh) * | 2010-06-17 | 2013-04-11 | Atomic Energy Council | 纖維原料活塞式壓差進料裝置 |
US10393106B2 (en) * | 2014-12-15 | 2019-08-27 | Sustainable Waste Power Systems, Inc. | Pumps, pump assemblies, and methods of pumping fluids |
EP3464714A4 (fr) * | 2016-05-27 | 2019-12-25 | Valmet AB | Charge d'alcali double pour imprégnation de copeau |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1984003527A1 (fr) * | 1983-03-02 | 1984-09-13 | Nivelleau Bruniere Patrick M F | Procede de traitement de matieres ligno-cellulosique pour l'obtention de cellulose. |
US4968385A (en) * | 1988-06-06 | 1990-11-06 | Kamyr Ab | Method of preparing a plup using a fluidizing centrifugal pump during impregnation |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2975096A (en) * | 1957-11-18 | 1961-03-14 | Bauer Bros Co | Impregnation of wood chips |
US3041233A (en) * | 1957-12-17 | 1962-06-26 | Kamyr Ab | Method of introducing high density pulp into a pressure vessel |
FR2542021B3 (fr) * | 1983-03-02 | 1985-11-08 | Nivelleau Bruniere Patrick M F | Procede de traitement du bois ou autre matiere ligno-cellulosique pour l'obtention de pate cellulosique - papier ou carton - produits chimiques |
-
1990
- 1990-12-17 FR FR9015759A patent/FR2670512A1/fr active Pending
-
1991
- 1991-12-09 WO PCT/FR1991/000986 patent/WO1992011409A1/fr active IP Right Grant
- 1991-12-09 ES ES92901780T patent/ES2089490T3/es not_active Expired - Lifetime
- 1991-12-09 CA CA002098493A patent/CA2098493A1/fr not_active Abandoned
- 1991-12-09 EP EP92901780A patent/EP0570385B1/fr not_active Expired - Lifetime
- 1991-12-09 DE DE69118919T patent/DE69118919T2/de not_active Expired - Fee Related
- 1991-12-09 AU AU91282/91A patent/AU9128291A/en not_active Abandoned
- 1991-12-16 CN CN91112745A patent/CN1064117A/zh active Pending
-
1993
- 1993-07-20 US US08/075,476 patent/US5478439A/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1984003527A1 (fr) * | 1983-03-02 | 1984-09-13 | Nivelleau Bruniere Patrick M F | Procede de traitement de matieres ligno-cellulosique pour l'obtention de cellulose. |
US4968385A (en) * | 1988-06-06 | 1990-11-06 | Kamyr Ab | Method of preparing a plup using a fluidizing centrifugal pump during impregnation |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000052256A1 (fr) * | 1999-03-02 | 2000-09-08 | Andritz Inc. | Preconditionnement de l'alimentation pour reduction en pate chimique |
Also Published As
Publication number | Publication date |
---|---|
AU9128291A (en) | 1992-07-22 |
DE69118919T2 (de) | 1996-11-28 |
EP0570385A1 (fr) | 1993-11-24 |
DE69118919D1 (de) | 1996-05-23 |
CA2098493A1 (fr) | 1992-06-18 |
CN1064117A (zh) | 1992-09-02 |
US5478439A (en) | 1995-12-26 |
ES2089490T3 (es) | 1996-10-01 |
FR2670512A1 (fr) | 1992-06-19 |
EP0570385B1 (fr) | 1996-04-17 |
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