SE455314B - PREPARATION OF CELLULOSAMASA INCLUDING CHEMICAL PREPARATION AND DEFIBRATION BY EXPANSION - Google Patents
PREPARATION OF CELLULOSAMASA INCLUDING CHEMICAL PREPARATION AND DEFIBRATION BY EXPANSIONInfo
- Publication number
- SE455314B SE455314B SE8504083A SE8504083A SE455314B SE 455314 B SE455314 B SE 455314B SE 8504083 A SE8504083 A SE 8504083A SE 8504083 A SE8504083 A SE 8504083A SE 455314 B SE455314 B SE 455314B
- Authority
- SE
- Sweden
- Prior art keywords
- pressure vessel
- pressure
- vessel
- steam
- impregnation
- 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
- D21C3/00—Pulping cellulose-containing materials
- D21C3/04—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides
- D21C3/06—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides sulfur dioxide; sulfurous acid; bisulfites sulfites
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/36—Explosive disintegration by sudden pressure reduction
Description
15 20 25 30 35 455 314 efter snabbt töms och bringas att expandera i ett kärl under väsent- ligt lägre och väsentligen konstant tryck. Enligt en annan aspekt på uppfinningen behandlas materialet efter impregneringen med nämnda vat- tenlösning av ett eller flera natriumsalter av svaveldioxid som inji- ceras i tryckkärlet innan vattenångan injiceras under högt tryck. 455 314 after rapidly emptying and expanding in a vessel under substantially lower and substantially constant pressure. According to another aspect of the invention, the material is treated after the impregnation with said aqueous solution of one or more sodium salts of sulfur dioxide which are injected into the pressure vessel before the water vapor is injected under high pressure.
Enligt de valda utföringsformerna utgörs nämnda natriumsalt eller na- triumsalter av natriumkarbonat och/eller natriumsulfit, ehuru även andra natríumsalter är tänkbara. Vidare är det möjligt att förutom dessa impregneringsmedel använda ytterligare kemikalier. Exempelvis kan man utnyttja ett kondensat som erhålls från ångan i det nämnda expansionskärlet, vilket kondensat kan innehålla metanol och andra högre alkoholer.According to the selected embodiments, said sodium salt or sodium salts consist of sodium carbonate and / or sodium sulfite, although other sodium salts are also conceivable. Furthermore, it is possible to use additional chemicals in addition to these impregnating agents. For example, one can use a condensate obtained from the steam in the said expansion vessel, which condensate may contain methanol and other higher alcohols.
Ytterligare kännetecken på uppfinningen framgår av patentkraven samt av följande beskrivning av en föredragen utföringsform.Further features of the invention appear from the claims and from the following description of a preferred embodiment.
KORT FIGURBESKRIVNING I den följande beskrivningen av en föredragen utföringsform kommer att hänvisas till ritningsfiguren som i diagramform schematiskt illustre- rar den föredragna utföringsformen jämte den apparatur som härvid ut- nyttjas.BRIEF DESCRIPTION OF THE DRAWINGS In the following description of a preferred embodiment, reference will be made to the drawing figure which in diagrammatic form schematically illustrates the preferred embodiment as well as the apparatus used herein.
BESKRIVNING Av FÖREDRAGEN UTFÖRINGSFORM Fiberråvaran, vanligen flis, matas till ett basningskärl l, där över- skottsânga värmer flisen (eller motsvarande fiberråvara) och fyller fiberlumen med kondenserad ånga som driver ut luften i flisen på känt sätt.DESCRIPTION OF THE PREFERRED EMBODIMENT The fiber raw material, usually chips, is fed to a basing vessel 1, where excess steam heats the chips (or equivalent fiber raw material) and fills the fiber lumen with condensed steam which expels the air in the chips in a known manner.
Den basade flisen matas med jämn hastighet med hjälp av en skruv- transportör 2 och en roterande sluss (kik) 3 in i ett första tryckkärl eller impregneringskärl 4. Trycket i detta impregneringskärl 4 upp- rätthålls vid cirka 1-8 bar och vid en temperatur under kokpunkten vid ifrågavarande tryck med hjälp av ånga från ett efterföljande andra tryckkärl 5 via en första ångledning 6. Impregneringskemikalier - en- ligt utföringsformen natriumkarbonat - och/eller natriumsulfitlösning 15 20 25 30 35 _; 455 314 - pumpas in i impregneringskärlet 4 genom en ledning 7. Flisen matas kontinuerligt nedåt i impregneringskärlet 4 i sådan takt att behand- lingstiden för flisen i kontakt med kemikalierna blir max 2 timmar.The base chip is fed at a constant speed by means of a screw conveyor 2 and a rotating lock (binoculars) 3 into a first pressure vessel or impregnation vessel 4. The pressure in this impregnation vessel 4 is maintained at about 1-8 bar and at a temperature below the boiling point at the pressure in question by means of steam from a subsequent second pressure vessel 5 via a first steam line 6. Impregnation chemicals - according to the embodiment sodium carbonate - and / or sodium sulphite solution 15 20 25 30 35 _; 455 314 - pumped into the impregnation vessel 4 through a line 7. The chips are fed continuously downwards into the impregnation vessel 4 at such a rate that the treatment time for the chips in contact with the chemicals is a maximum of 2 hours.
Slutligen slussas den impregnerade flisen ut genom ventilen 8 i bot- tendelen. En omrörare har betecknats 9.Finally, the impregnated chip is released through the valve 8 in the bottom part. A stirrer has been designated 9.
Det impregnerade materialet transporteras genom en ledning lO till en avvattningssil ll, i vilken vätskeöverskott avlägsnas. Filtratet åter- cirkuleras till impregneringskärlet 4 genom en ledning 14. Den med ke- mikalier impregnerade flisen lagras i en buffertbehållare 12, som är försedd med en utmatningsskruv 13. Via denna utmatningsskruv 13 och en ventil 15 matas den impregnerade flisen in i nämnda andra tryckkärl 5, som utgörs av ett högtryckskärl. Fyllningen av tryckkärlet 5 sker myc- ket snabbt. I stället för satsvis behandling av den impregnerade fli- sen i tryckkärlet 5, kan man även tänka sig kontinuerlig behandling under tryck. När avsedd mängd flis enligt utföringsformen fyllts i högtryckskärlet 5 stängs ventilen 15 och en bottenventil 16 förblir stängd under den härefter följande behandlingen.The impregnated material is transported through a line 10 to a dewatering screen 11, in which excess liquid is removed. The filtrate is recirculated to the impregnation vessel 4 through a line 14. The chip impregnated with chemicals is stored in a buffer container 12, which is provided with a discharge screw 13. Via this discharge screw 13 and a valve 15 the impregnated chip is fed into said second pressure vessel. 5, which consists of a high-pressure vessel. The filling of the pressure vessel 5 takes place very quickly. Instead of batch treatment of the impregnated chip in the pressure vessel 5, continuous treatment under pressure is also conceivable. When the intended amount of chips according to the embodiment is filled into the high-pressure vessel 5, the valve 15 is closed and a bottom valve 16 remains closed during the subsequent treatment.
Svaveldioxid, S02, inleds i gas - eller vätskeform - i tryckkärlet 5 genom en ledning 17 via en automatisk ventil 18, så att pH i vatten- lösningen i kärlet 5 uppgår till 5-12, företrädesvis 8-12. Syftet med injektionen av svaveldioxid är dels att vid behov höja pH till önskad nivå (detta gäller särskilt då flisen i impregneringskärlet 4 behand- lats med natriumkarbonat utan tillsats av natriumsulfit eller med en- dast så liten tillsats av natriumsulfit att önskat pH inte uppnåtts enbart genom denna tillsats), dels att tillsammans med de andra kemi- kalierna delta i den kemiska behandlingen av flisen genom bildandet av natriumsulfit, varigenom behovet av kemikalier i impregneringskärlet 4 kan reduceras. När svaveldioxiden har injicerats injiceras även hög- trycksånga in i kärlet 5 från en ångdom 19 via en ledning 20 och en ventil 21, så att trycket i kärlet 5 snabbt höjs av den mättade vat- tenångan till ett önskat tryck mellan 35 och BO bar, samtidigt som temperaturen höjs till de temperaturer som gäller för mättad vatten- ånga vid dessa tryck, det vill säga en temperatur mellan 235 och 300°C. Efter en uppehållstid av 3-70 sekunder vid nämnda tryck och 10 15 20 25 30 35 455 314 o; temperatur blåses innehållet i kärlet 5 snabbt via ventilen 16 ut i ett tredje tryckkärl 22, som enligt det föredragna utföringssättet hålls vid ett konstant tryck av cirka 5-6 bar. Enligt utföringsformen arbetar tryokkärlet 5 alltså cykliskt, varvid varje cykel består av fyllning av kärlet 5 med impregnerad fiberråvara, stängning av ven- tilen 15, injektion av svaveldioxid genom ledningen 17, injektion av vattenånga genom ledningen 20, öppning av ventilen 16 och tömning av innehållet till kärlet 22, stängning av ventilen 16 och öppning av ventilen 15. Hela denna cykel utförs på en tid av mellan 1-3 minuter.Sulfur dioxide, SO 2, is introduced in gas - or liquid form - into the pressure vessel 5 through a line 17 via an automatic valve 18, so that the pH of the aqueous solution in the vessel 5 amounts to 5-12, preferably 8-12. The purpose of the injection of sulfur dioxide is partly to raise the pH to the desired level if necessary (this is especially true when the chips in the impregnation vessel 4 are treated with sodium carbonate without the addition of sodium sulphite or with only such a small addition of sodium sulphite that the desired pH is not achieved only by this additive), partly to participate together with the other chemicals in the chemical treatment of the chips through the formation of sodium sulphite, whereby the need for chemicals in the impregnation vessel 4 can be reduced. When the sulfur dioxide has been injected, high-pressure steam is also injected into the vessel 5 from a steam 19 via a line 20 and a valve 21, so that the pressure in the vessel 5 is rapidly raised by the saturated water vapor to a desired pressure between 35 and BO bar. at the same time as the temperature is raised to the temperatures that apply to saturated water vapor at these pressures, ie a temperature between 235 and 300 ° C. After a residence time of 3-70 seconds at said pressure and 10 15 45 45 455 314 o; temperature, the contents of the vessel 5 are quickly blown out via the valve 16 into a third pressure vessel 22, which according to the preferred embodiment is kept at a constant pressure of about 5-6 bar. According to the embodiment, the pressure vessel 5 thus operates cyclically, each cycle consisting of filling the vessel 5 with impregnated fiber raw material, closing the valve 15, injecting sulfur dioxide through the line 17, injecting water vapor through the line 20, opening the valve 16 and emptying the contents. to the vessel 22, closing the valve 16 and opening the valve 15. This whole cycle is performed in a time of between 1-3 minutes.
Under varje cykel, då behållaren 5 är trycksatt, förmedlas dessutom ånga genom ledningen 6 till impregneringskärlet 4.During each cycle, when the container 5 is pressurized, steam is also conveyed through the line 6 to the impregnation vessel 4.
Den frigivna ångan från det tredje tryckkärlet 22 leds till och kon- denseras i en ångomformare 23, som genererar mättad färsk ånga med ett tryck av 4-5 bar. Massan från det tredje tryckkärlet 22 avtappas via ledningen 24 och en ventil 25 för fortsatt behandling. Delar av ång- kondensatet, som kan innehålla metanol och andra högre alkoholer, kan via en ledning 26 återanvändas för impregnering av flisen i impreg- neringskärlet 24 tillsammans med de andra kemikalierna.The released steam from the third pressure vessel 22 is led to and condensed in a steam converter 23, which generates saturated fresh steam with a pressure of 4-5 bar. The mass from the third pressure vessel 22 is drained via the line 24 and a valve 25 for further treatment. Parts of the steam condensate, which may contain methanol and other higher alcohols, can be reused via a line 26 for impregnating the chips in the impregnation vessel 24 together with the other chemicals.
IJ'IJ '
Claims (7)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8504083A SE455314B (en) | 1985-09-03 | 1985-09-03 | PREPARATION OF CELLULOSAMASA INCLUDING CHEMICAL PREPARATION AND DEFIBRATION BY EXPANSION |
PCT/SE1986/000389 WO1987001402A1 (en) | 1985-09-03 | 1986-09-02 | Method for producing of cellulosic pulp |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE8504083A SE455314B (en) | 1985-09-03 | 1985-09-03 | PREPARATION OF CELLULOSAMASA INCLUDING CHEMICAL PREPARATION AND DEFIBRATION BY EXPANSION |
Publications (3)
Publication Number | Publication Date |
---|---|
SE8504083D0 SE8504083D0 (en) | 1985-09-03 |
SE8504083L SE8504083L (en) | 1987-03-04 |
SE455314B true SE455314B (en) | 1988-07-04 |
Family
ID=20361275
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE8504083A SE455314B (en) | 1985-09-03 | 1985-09-03 | PREPARATION OF CELLULOSAMASA INCLUDING CHEMICAL PREPARATION AND DEFIBRATION BY EXPANSION |
Country Status (2)
Country | Link |
---|---|
SE (1) | SE455314B (en) |
WO (1) | WO1987001402A1 (en) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1230208A (en) * | 1987-03-24 | 1987-12-15 | Bohuslav V. Kokta | Process for preparing pulp for paper making |
CA2037275A1 (en) * | 1991-02-28 | 1992-08-29 | Bohuslav V. Kokta | Steam explosion pulping process for papermaking |
US6413362B1 (en) | 1999-11-24 | 2002-07-02 | Kimberly-Clark Worldwide, Inc. | Method of steam treating low yield papermaking fibers to produce a permanent curl |
KR20010100017A (en) | 1998-12-30 | 2001-11-09 | 로날드 디. 맥크레이 | Steam Explosion Treatment with Addition of Chemicals |
EP1571255A1 (en) * | 2004-03-03 | 2005-09-07 | SCA Hygiene Products GmbH | Apparatus and method for reducing steam loss in a closed system |
CA2759130C (en) * | 2009-04-30 | 2018-03-13 | Eve Research Inc. | Preparation of biofuels and other useful products such as 5-(hydroxymethyl)-furfural |
NZ578113A (en) * | 2009-07-01 | 2010-07-30 | Lignotech Developments Ltd | Processing of lignocellulosic and related materials |
EP2336344A1 (en) * | 2009-12-21 | 2011-06-22 | Sekab E-Technology AB | Pre-treatment of cellulosic material |
CN104562827B (en) * | 2014-12-11 | 2016-06-01 | 陕西科技大学 | The dynamic shaping device of a kind of laboratory simulation long mesh paper making machine |
KR20210141648A (en) * | 2019-03-20 | 2021-11-23 | 이미르 테크놀로지즈 이에이치에프. | Steam-explosive equipment and methods for the treatment of organic materials |
WO2021110188A1 (en) * | 2019-12-03 | 2021-06-10 | Klingele Papierwerke Gmbh & Co. Kg | Method and device for producing fibrous material with a feed system and a helical screw system |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1872996A (en) * | 1925-05-21 | 1932-08-23 | Masonite Corp | Process of making paper pulp |
US2234188A (en) * | 1938-03-31 | 1941-03-11 | Masonite Corp | Process of making light-colored ligno-cellulose fiber |
SE434652B (en) * | 1977-04-27 | 1984-08-06 | Commw Scient Ind Res Org | PROCEDURE FOR EXPLOSION DEFIBRATION OF CELLULOSIC FIBERS FROM VEGETABLE MATERIAL AND EXHAUST NOZZLE FOR IMPLEMENTATION OF THE PROCEDURE |
-
1985
- 1985-09-03 SE SE8504083A patent/SE455314B/en not_active IP Right Cessation
-
1986
- 1986-09-02 WO PCT/SE1986/000389 patent/WO1987001402A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
SE8504083L (en) | 1987-03-04 |
WO1987001402A1 (en) | 1987-03-12 |
SE8504083D0 (en) | 1985-09-03 |
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