DE441424C - Process for the recovery of hemicellulose-free caustic soda from mercerization liquor - Google Patents

Process for the recovery of hemicellulose-free caustic soda from mercerization liquor

Info

Publication number
DE441424C
DE441424C DED42899D DED0042899D DE441424C DE 441424 C DE441424 C DE 441424C DE D42899 D DED42899 D DE D42899D DE D0042899 D DED0042899 D DE D0042899D DE 441424 C DE441424 C DE 441424C
Authority
DE
Germany
Prior art keywords
liquor
hemicellulose
caustic soda
mercerization
recovery
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
DED42899D
Other languages
German (de)
Inventor
Dr Karl Leuchs
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.)
ZELLSTOFF TEXTILWERKE GmbH
Original Assignee
ZELLSTOFF TEXTILWERKE GmbH
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 ZELLSTOFF TEXTILWERKE GmbH filed Critical ZELLSTOFF TEXTILWERKE GmbH
Priority to DED42899D priority Critical patent/DE441424C/en
Application granted granted Critical
Publication of DE441424C publication Critical patent/DE441424C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
    • C01D1/04—Hydroxides
    • C01D1/28—Purification; Separation
    • C01D1/32—Purification; Separation by absorption or precipitation

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Paper (AREA)

Description

Verfahren zur Wiedergewinnung hemicellulosefreien Ätznatrons aus rdercerisationslauge. Bekanntlich reichert sich die zum Mercerisieren von Zellstoffen verwendete Natronlauge an sogenannten Hernicellulosen an. Sie muß daher von Zeit zu Zeit abgestoßen werden. Die bisher gemachten Vorschläge, die Lauge von diesen Stoffen zu befreien, die meist darauf hinauslaufen, die Hemicellulose an Metalloxyde zu binden und unlöslich niederzuschlagen, haben nicht zum Ziele geführt.Process for the recovery of hemicellulose-free caustic soda from dercerization liquor. It is well known that the caustic soda used to mercerize cellulose is enriched of so-called hernicelluloses. It must therefore be repelled from time to time. Most of the proposals made so far to free the lye from these substances result in binding the hemicellulose to metal oxides and depositing them insoluble, did not lead to the goal.

Die Erfindung schlägt den umgekehrten Weg ein und gewinnt. nach teilweiser -Abscheidung der Hemicelulose durch Kohlensäure Soda in reiner kristallisierter Form, «-elche durch Kaustifikation mit Kalk wieder in Ätznatron übergeführt werden kann:. Bei der Sättigung der Mercerisationslauge mit Kohlensäure scheiden sich über 5o Prozent der Hemicellulosen aus und können nach Filtration als Viehfutter oder anderweitig verwendet «-erden. Zweckmäßig arbeitet man dabei bei etwas erhöhter Temperatur, so daß Soda noch nicht auskristallisiert. Beim Abkühlen der Mutterlauge kristallisieren etwa 8o Prozent des Ätznatrons als Soda in reiner Form aus. Der Rest kann nach erneuerter Konzentration durch Eindampfen gewonnen werden. (Es ist selbstverständlich, daß man durch Einleiten von überschüssiger Kohlensäure auch doppeltkohlensaures Natron ausfällen kann.) Zur Wiedergewinnung des in den sogenannten Schwarzlaugen, die bei der Zellstoffgewinnung nach dem Culfatverfahren anfallen, enthaltenen Ätznatrons ist zwar auch schon Sättigung mit Kohlensäure und Auskristallisieren von Soda vorgeschlagen worden, Die in den Schwarzlaugen enthaltenen Stoffe bestehen aber aus Abbauprodukten des Lignins, d. h. aus Körpern von Phenolcharakter, die von den Hemicellulosen verschieden sind.The invention takes the opposite approach and wins. after partial -Deposition of the hemicelulose by carbonic acid soda in pure crystallized Form, which are converted back into caustic soda by causticizing with lime can:. When the mercerization liquor is saturated with carbonic acid, they are separated 50 percent of hemicelluloses and can be used as fodder or after filtration otherwise used «-erden. It is advisable to work at a slightly higher level Temperature so that soda does not yet crystallize out. When the mother liquor cools down About 80 percent of the caustic soda crystallizes out as soda in its pure form. Of the The rest can be obtained by evaporation after renewed concentration. (It is Of course, you can also do this by introducing excess carbon dioxide bicarbonate of soda can precipitate.) To recover the in the so-called Black liquors that are produced in the production of pulp using the sulphate process, The caustic soda contained in it is already saturated with carbonic acid and crystallizes out suggested by soda, the substances contained in the black liquor exist but from degradation products of lignin, d. H. from bodies of phenolic character which are different from hemicelluloses.

Claims (1)

PATENTANSPRUCH: Verfahren zum Wiedergewinnen hemicellulosefreien Ätznatrons aus Mercerisationslauge, dadurch gekennzeichnet, daß man die Lauge mit Kohlensäure sättigt, hierdurch den größten Teil der Hemicellulose abscheidet, die Soda (bzw. das doppeltkohlensaure Natron) in reiner Form Ar Kristallisation bringt und durch Kalk kaustifiziert.CLAIM OF THE PATENT: Process for the recovery of hemicellulose-free caustic soda from mercerization liquor, characterized in that the liquor is carbonated saturates, thereby separating most of the hemicellulose, the soda (resp. bicarbonate of soda) in pure form brings Ar crystallization and through Lime causticized.
DED42899D 1922-12-19 1922-12-19 Process for the recovery of hemicellulose-free caustic soda from mercerization liquor Expired DE441424C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DED42899D DE441424C (en) 1922-12-19 1922-12-19 Process for the recovery of hemicellulose-free caustic soda from mercerization liquor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED42899D DE441424C (en) 1922-12-19 1922-12-19 Process for the recovery of hemicellulose-free caustic soda from mercerization liquor

Publications (1)

Publication Number Publication Date
DE441424C true DE441424C (en) 1927-03-03

Family

ID=7047201

Family Applications (1)

Application Number Title Priority Date Filing Date
DED42899D Expired DE441424C (en) 1922-12-19 1922-12-19 Process for the recovery of hemicellulose-free caustic soda from mercerization liquor

Country Status (1)

Country Link
DE (1) DE441424C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE749178C (en) * 1940-08-13 1944-11-21 Saechsische Zellwolle Ag Process for the recovery of sulfur from the exhaust gases containing hydrogen sulphide resulting from the manufacture of artificial structures by the viscose process

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE749178C (en) * 1940-08-13 1944-11-21 Saechsische Zellwolle Ag Process for the recovery of sulfur from the exhaust gases containing hydrogen sulphide resulting from the manufacture of artificial structures by the viscose process

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