AT105478B - Process for the production of sulphite pulp from pine wood. - Google Patents

Process for the production of sulphite pulp from pine wood.

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Publication number
AT105478B
AT105478B AT105478DA AT105478B AT 105478 B AT105478 B AT 105478B AT 105478D A AT105478D A AT 105478DA AT 105478 B AT105478 B AT 105478B
Authority
AT
Austria
Prior art keywords
production
sulphite pulp
pine wood
wood
pine
Prior art date
Application number
Other languages
German (de)
Original Assignee
G A Serlachius Aktiebolag
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 G A Serlachius Aktiebolag filed Critical G A Serlachius Aktiebolag
Application granted granted Critical
Publication of AT105478B publication Critical patent/AT105478B/en

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Description

  

   <Desc/Clms Page number 1> 
 



  Verfahren zur Herstellung von Sulfitzellstoff   aus Kiefernholz.   
 EMI1.1 
 hat auch versucht, Sulfitzellstoff aus Kiefernholz herzustellen, jedoch bisher ohne zufriedenstellenden Erfolg. 



   Die Erfindung betrifft   nun   ein Verfahren zur Herstellung von Sulfitzellstoff aus Kiefernholz, mit dessen Hilfe es möglich wird, einen weissen Zellstoff zu erzeugen, der dieselbe gute Beschaffenheit wie der aus Tannenholz hergestellte Sulfitzellstoff besitzen soll. Dieses Ergebnis wird einerseits durch eine besondere Zusammensetzung der Kochlauge, anderseits durch eine entsprechende Regelung der Wärme- und Druckverhältnisse während des Kochens erreicht. 



   Gemäss der Erfindung wird eine Kochlauge benutzt, die ausser Kalziumbisulfit und einen verhältnismässig hohen Gehalt von freier schwefliger Säure auch   Natriumsulfit   enthält. Ferner wird die Kochung bei etwas höherem Druck und etwas niedrigerer Temperatur als bei   der gewöhnlichen Herstellung von     Sulfitzellstoff   aus Tannenholz durchgeführt, u. zw. bei einem Druck von 5 bis 6 Atm. und einer Endtemperatur von   120-150  C.   



   Die Zubereitung der Kochflüssigkeit geschieht in folgender Weise : In den mit Kiefernholz gefüllten   Kocher wird zunächst   eine wässerige Lösung von Ätznatron in solcher   Menge eingefüllt,   dass der Ätznatrongehalt höchstens 1% der Zellstoffmenge des Holzes beträgt. Der Kocher wird dann mit einer   Kalzium-   
 EMI1.2 
   bzw. Natriumbisulfit um. Es   hat sich in der Praxis erwiesen, dass die   Koehfliissigkeit     fähig   ist, die Harzund Ligninstoffe des Kiefernholzes vollständig auszulösen, wenn nur der Druck auf der   obengenannten   Hohe und die Kochtemperatur gleichzeitig verhältnismässig niedrig gehalten wird. 

**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.



   <Desc / Clms Page number 1>
 



  Process for the production of sulphite pulp from pine wood.
 EMI1.1
 has also tried to make sulphite pulp from pine, but so far without satisfactory results.



   The invention now relates to a process for the production of sulphite pulp from pine, with the help of which it is possible to produce a white pulp which is said to have the same good quality as the sulphite pulp made from fir wood. This result is achieved on the one hand through a special composition of the cooking liquor and on the other hand through appropriate control of the heat and pressure conditions during cooking.



   According to the invention, a cooking liquor is used which, in addition to calcium bisulfite and a relatively high content of free sulfurous acid, also contains sodium sulfite. Furthermore, the cooking is carried out at a slightly higher pressure and a slightly lower temperature than in the usual production of sulphite pulp from fir wood, u. between at a pressure of 5 to 6 atm. and a final temperature of 120-150 C.



   The preparation of the cooking liquid is done in the following way: First an aqueous solution of caustic soda is poured into the cooker filled with pine wood in such an amount that the caustic soda content is at most 1% of the amount of pulp in the wood. The cooker is then filled with a calcium
 EMI1.2
   or sodium bisulfite. It has been shown in practice that the liquid is capable of completely releasing the resin and lignin substances of the pine if only the pressure is kept at the above-mentioned level and the cooking temperature is kept relatively low at the same time.

** WARNING ** End of DESC field may overlap beginning of CLMS **.

Claims (1)

PATENT-ANSPRUCH : Verfahren zur Herstellung von weissem Sulfitzellstoff aus Kiefernholz, dadurch gekennzeichnet, dass als Kochflüssigkeit eine Kalziumbisulfitlosung mit 3'5 bis 4#5% Gesamtgehalt an schwefliger Säure EMI1.3 Zellulose des Holzes gerechnet, Ätznatron benutzt wird, und dass die Kochung in an sich bekannter Weise bei einem Druck von etwa 5 bis ss Atm. und einer Endtemperatur von etwa 120 bis 150 stattfindet. **WARNUNG** Ende CLMS Feld Kannt Anfang DESC uberlappen**. PATENT CLAIM: Process for the production of white sulphite pulp from pine wood, characterized in that a calcium bisulphite solution with a total content of 3'5 to 4% 5% sulfurous acid is used as the cooking liquid EMI1.3 Cellulose of the wood counted, caustic soda is used, and that the boiling in a manner known per se at a pressure of about 5 to ss atm. and a final temperature of about 120 to 150 takes place. ** WARNING ** End of CLMS field may overlap beginning of DESC **.
AT105478D 1923-07-20 1924-07-04 Process for the production of sulphite pulp from pine wood. AT105478B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI105478X 1923-07-20

Publications (1)

Publication Number Publication Date
AT105478B true AT105478B (en) 1927-02-10

Family

ID=8555952

Family Applications (1)

Application Number Title Priority Date Filing Date
AT105478D AT105478B (en) 1923-07-20 1924-07-04 Process for the production of sulphite pulp from pine wood.

Country Status (1)

Country Link
AT (1) AT105478B (en)

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