DE371429C - Process for preparing straw for the purpose of digesting it with chlorine - Google Patents

Process for preparing straw for the purpose of digesting it with chlorine

Info

Publication number
DE371429C
DE371429C DEW56191D DEW0056191D DE371429C DE 371429 C DE371429 C DE 371429C DE W56191 D DEW56191 D DE W56191D DE W0056191 D DEW0056191 D DE W0056191D DE 371429 C DE371429 C DE 371429C
Authority
DE
Germany
Prior art keywords
straw
chlorine
digesting
hydrochloric acid
preparing straw
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
DEW56191D
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.)
P WAENTIG DR
Original Assignee
P WAENTIG DR
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 P WAENTIG DR filed Critical P WAENTIG DR
Priority to DEW56191D priority Critical patent/DE371429C/en
Application granted granted Critical
Publication of DE371429C publication Critical patent/DE371429C/en
Expired legal-status Critical Current

Links

Classifications

    • DTEXTILES; PAPER
    • D01NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01CCHEMICAL OR BIOLOGICAL TREATMENT OF NATURAL FILAMENTARY OR FIBROUS MATERIAL TO OBTAIN FILAMENTS OR FIBRES FOR SPINNING; CARBONISING RAGS TO RECOVER ANIMAL FIBRES
    • D01C1/00Treatment of vegetable material
    • D01C1/02Treatment of vegetable material by chemical methods to obtain bast fibres

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Molecular Biology (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Textile Engineering (AREA)
  • Paper (AREA)

Description

Verfahren zur Vorbereitung von Stroh zum Zwecke seiner Aufschließung mit Chlor. Es hat sich ergeben, daß zum Zwecke des für eine Aufschließung verholzten Fasermaterials mit Chlor erforderlichenAufweichung des Aufschließungsgutes bei Verwendung von Stroh und strohähnlichenRohstoffen einkurzes Kochen des Strohs mit der bei der Chlorierung anfallenden Salzsäure vorteilhaft ist. Die Möglichkeit dieser Anwendungsweise einer stärkeren Säure wie Salzsäure in der Wärme für den Zweck der Zellstoffgewinnung aus Stroh war nach den bisherigen Erfahrungen nicht zu erwarten, denn bei anderen verholzten, zellulosehaltigen Rohstoffen, insbesondere bei Holz, führt sie nicht zum Ziel, wie dies übrigens auch nach den bekannten Untersuchungen von S c h w a 1 b e über die Zermürbung von Holz mit Salzsäure in der Wärme zu erwarten war, ein Vorgang, der bekanntlich als eine Überführung der Zellulose in Hydrozellulose aufgefaßt wird.Process for preparing straw for the purpose of digesting it with chlorine. It has been found that for the purpose of opening up lignified Fiber material with chlorine required softening of the decomposed material when used of straw and straw-like raw materials a short cooking of the straw with the Chlorination resulting hydrochloric acid is advantageous. The possibility of this application a stronger acid such as hydrochloric acid in the heat for the purpose of pulp production According to previous experience, straw was not to be expected, because with others It does not lead to lignified, cellulosic raw materials, especially wood to the goal, as also according to the well-known investigations by S c h w a 1 b e was to be expected about the attrition of wood with hydrochloric acid in the warmth Process which is known as the conversion of cellulose into hydrocellulose will.

Durch diese Vorbehandlungsweise des Strohes wird i. eine Ersparnis von Natron erreicht, indem der sonst hierzu in Betracht kommende Verbrauch von Ätznatron bei der eben erwähnten, Vorbehandlung vollständig wegfällt, 2. das ganze Aufschließungsverfahren wesentlich vereinfacht, indem. die sonst notwendige Entfernung der Natronlauge vor der Chlori.erung unterbleiben kann., 3. eine Verwendung der in dem Aufschließungsverfahren anfallenden Salzsäure innerhalb desselben technischen Prozesses ermöglicht.This pretreatment of the straw i. a savings of soda is achieved by the otherwise relevant consumption of caustic soda in the case of the just mentioned pretreatment completely omitted, 2. the whole digestion process much simplified by. the otherwise necessary removal of the caustic soda the chlorination can be omitted., 3. a use of the in the digestion process accruing hydrochloric acid allows within the same technical process.

Da die Wirkungsweise der Salzsäure offenbar nach Art der Säurehydrolyse in der Hauptsache eine katalytische ist, so steht nichts im Wege, die Säure nach ihrer Verwendung zum Vorbehandeln des Rohmaterials schließlich zur Neutralisation und. Fällung .der Ligninsubstanzen aus den bei .der Nachbehandlung abfallenden Schwarzlaugen zu verwenden.Since the mode of action of hydrochloric acid evidently resembles acid hydrolysis If it is mainly catalytic, then nothing stands in the way of the acid their use for pretreating the raw material and finally for neutralization and. Precipitation of the lignin substances from the black liquor that falls off during the aftertreatment to use.

Die Aufschließung von Stroh kann danach beispielsweise wie folgt vorgenommen werden: frischer Strohhäcksel wird mit der beim Auswaschen von chloriertem Stroh in einer Konzentration von etwa i Prozent zu gewinnenden Salzsäure eine Stunde lang gekocht und dann ohne weiteres Auswaschen zunächst mit Chlor und schließlich bei gewöhnlicher Temperatur mit verdünnten Alkalien weiterbehandelt.The opening of straw can then be carried out, for example, as follows be: fresh chopped straw will be the same as when washing out chlorinated straw hydrochloric acid to be recovered at a concentration of about 1 percent for one hour boiled and then without further washing, first with chlorine and finally with further treated with diluted alkalis at ordinary temperature.

Claims (1)

PATENTANSPRUCH: Verfahren zur Vorbereitung von Stroh zum Zwecke seiner Aufschließung mit Chlor, dadurch gekennzeichnet, daß die bei der Chlorierung abfallende Salzsäure zur Vorbehandlung .des; Strohs vor der Chlorierung verwendet wird.PATENT CLAIM: Process for preparing straw for the purpose of his Digestion with chlorine, characterized in that the falling in the chlorination Hydrochloric acid for pretreatment .des; Straw is used before chlorination.
DEW56191D 1920-09-09 1920-09-09 Process for preparing straw for the purpose of digesting it with chlorine Expired DE371429C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEW56191D DE371429C (en) 1920-09-09 1920-09-09 Process for preparing straw for the purpose of digesting it with chlorine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEW56191D DE371429C (en) 1920-09-09 1920-09-09 Process for preparing straw for the purpose of digesting it with chlorine

Publications (1)

Publication Number Publication Date
DE371429C true DE371429C (en) 1923-03-15

Family

ID=7605042

Family Applications (1)

Application Number Title Priority Date Filing Date
DEW56191D Expired DE371429C (en) 1920-09-09 1920-09-09 Process for preparing straw for the purpose of digesting it with chlorine

Country Status (1)

Country Link
DE (1) DE371429C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE747455C (en) * 1940-07-02 1944-10-02 Sueddeutsche Zellwolle Ag Process for the pretreatment of flax and hemp shavings

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE747455C (en) * 1940-07-02 1944-10-02 Sueddeutsche Zellwolle Ag Process for the pretreatment of flax and hemp shavings

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