DE504667C - Process for the production of cellulose from wood or the like by means of an aqueous solution of sulfur dioxide under pressure - Google Patents

Process for the production of cellulose from wood or the like by means of an aqueous solution of sulfur dioxide under pressure

Info

Publication number
DE504667C
DE504667C DEA47635D DEA0047635D DE504667C DE 504667 C DE504667 C DE 504667C DE A47635 D DEA47635 D DE A47635D DE A0047635 D DEA0047635 D DE A0047635D DE 504667 C DE504667 C DE 504667C
Authority
DE
Germany
Prior art keywords
wood
sulfur dioxide
cellulose
production
aqueous solution
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.)
Expired
Application number
DEA47635D
Other languages
German (de)
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.)
RAOUL PICTET OG F THARALDSEN A
Original Assignee
RAOUL PICTET OG F THARALDSEN A
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 RAOUL PICTET OG F THARALDSEN A filed Critical RAOUL PICTET OG F THARALDSEN A
Application granted granted Critical
Publication of DE504667C publication Critical patent/DE504667C/en
Expired legal-status Critical Current

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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

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  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)

Description

Es ist bekannt, bei dem Aufschluß von Holz mit einer 7prozentigen SO2-Lösung und einer Höchsttemperatur von 1100C zu arbeiten, was einem Arbeitsdruck von max. 7 Atm. entspricht.It is known to work 2 solution and a maximum temperature of 110 0 C in the digestion of wood with a 7 per cent SO, what a working pressure of max. 7 atm. is equivalent to.

Es ist ferner bekannt, eine 100 bis 150 g SO2 pro Liter enthaltende Lösung bei einer Temperatur von 80 bis 900 und Druck von 5 bis 6 Atm. für die gleichen Zwecke anzuwenden. It is also known to use a solution containing 100 to 150 g of SO 2 per liter at a temperature of 80 to 90 0 and a pressure of 5 to 6 atm. apply for the same purposes.

Es ist schließlich bekannt, zur Vorbehandlung von Holz für den eigentlichen Aufschluß wäßrige SO„-Lösungen bei Drücken bis 8 Atm. zu benutzen.After all, it is known for the pretreatment of wood for the actual digestion aqueous SO “solutions at pressures up to 8 atm. to use.

Diese bisher bekannt gewordenen Vorschläge sind nicht geeignet, öine praktisch befriedigende Zellstoffherstellung aus Holz zu bewirken.
Die vorliegende Erfindung ermöglicht nunThese previously known proposals are not suitable for producing a practically satisfactory pulp production from wood.
The present invention now enables

ao einen befriedigenden Aufschluß des Holzes da/durch, daß der Druck beim Aufschluß unter Verwendung einer entsprechend konzentrierten SO2-Lösung auf mindestens 8 Atm. gesteigert wird.ao a satisfactory digestion of the wood because the pressure during digestion using an appropriately concentrated SO 2 solution is at least 8 atm. is increased.

aS Dadurch ist das Verfahren bei einer Temperatur von I2O° und darunter ausführbar geworden; es wird dabei eine hellfarbige Cellulose von vorzüglicher Qualität erzielt. Die Ausbeute an Cellulose ist auch besser als bei den bisherigen Verfahren. Andererseits wird gegenüber dem Sulfitverfahren an Kalk und Schwefeldioxyd gespart und wegen der kürzeren Kochzeit und der niedrigen Temperatur mit weniger Arbeit und unter Ersparnis von Wärme eine größere Produktion in der gleichen Anlage erreicht.aS This means that the process is at one temperature has become executable from I2O ° and below; it becomes a light colored one Cellulose of excellent quality achieved. The cellulose yield is also better than in the previous procedures. On the other hand, compared to the sulphite process, lime is used and sulfur dioxide saved and because of the shorter cooking time and the low temperature achieved greater production in the same plant with less work and with savings in heat.

Zur Ausführung des Verfahrens wird eine möglichst konzentrierte Lösung von Schwefeldioxyd durch Absorption von Schwefeldioxyd bzw. von Röstgasen in Wasser hergestellt. Die Konzentration von Sdrwefeldioxyd soll wenigstens 100 g pro Liter Kochflüssigkeit betragen. Mit dieser Lösung wird das Holz ο. dgl. bei einer Temperatur bis höchstens 1200 C behandelt, wobei der Druck auf über 8 Atm. steigt, so daß also die bisher zur Herstellung von Cellulose angewendeten Temperaturen von 130 bis i6o° keinesfalls erreicht werden. Der Prozeß ist in kurzer Zeit, d. h. z. B. in 8 bis 16 Stunden, beendet.To carry out the process, a solution of sulfur dioxide that is as concentrated as possible is prepared by absorbing sulfur dioxide or roasting gases in water. The concentration of sulfur dioxide should be at least 100 g per liter of cooking liquid. With this solution the wood becomes ο. Like. Treated at a temperature up to a maximum of 120 0 C, the pressure to over 8 atm. increases, so that the temperatures of 130 to 160 ° previously used for the production of cellulose are by no means reached. The process is completed in a short time, that is to say, for example, in 8 to 16 hours.

In bekannter Weise kann man die Einwirkung der Kochflüssigkeit auf das Holz er-The effect of the cooking liquid on the wood can be determined in a known way.

leichtern, indem man die Poren des letzteren durch Evakuierung entweder vor Einführung des Holzes in den Kocher oder im letzteren selbst vor' Einführung· ■ der Kochflüssigkeit von eingeschlossener Luft befreit.Ease by opening the pores of the latter by evacuating either prior to introduction the wood in the cooker or in the latter itself before the introduction of the cooking liquid freed from trapped air.

Das Sch'wefeldioxyd, welches nicht in Form von Ligninsulfonsäure und ähnlichen Stoffen an die Inkrusten des Holzes gebunden ist, kann aus dem Kocher wiedergewonnen, geg-ebenenfalls nach Reinigung, in Wasser absorbiert und wieder verwendet werden.The sulfur dioxide, which is not in the form of lignosulphonic acid and similar substances is bound to the incrustations of the wood, can be recovered from the stove, if necessary after cleaning, can be absorbed in water and reused.

Claims (2)

Patentansprüche:
r. Verfahren zur HerstellungPatent claims:
r. Method of manufacture Cellulose aus Holz o. dgl. mittels einer wäßrigen Lösung von Schwefeldioxyd unter Druck, dadurch gekennzeichnet, daß ein Druck von wenigstens 8 Atm. verwendet wird.Cellulose from wood or the like by means of an aqueous solution of sulfur dioxide under pressure, characterized in that a pressure of at least 8 atm. used will. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß die Reaktionstempt.'-ratur während der ganzen Dauer des Verfahrens unter I2O° C gehalten wird.2. The method according to claim i, characterized in that the reaction temp .'- temperature is kept below I2O ° C for the entire duration of the procedure. REKLIN. GEDRUCKT IN DERREKLIN. PRINTED IN THE
DEA47635D 1925-05-20 1926-04-27 Process for the production of cellulose from wood or the like by means of an aqueous solution of sulfur dioxide under pressure Expired DE504667C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NO252344X 1925-05-20

Publications (1)

Publication Number Publication Date
DE504667C true DE504667C (en) 1930-08-08

Family

ID=19905010

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA47635D Expired DE504667C (en) 1925-05-20 1926-04-27 Process for the production of cellulose from wood or the like by means of an aqueous solution of sulfur dioxide under pressure

Country Status (3)

Country Link
DE (1) DE504667C (en)
FR (1) FR616229A (en)
GB (1) GB252344A (en)

Also Published As

Publication number Publication date
GB252344A (en) 1926-12-09
FR616229A (en) 1927-01-29

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