DE528129C - Process for breaking down cellulosic materials such as wood, straw and the like. like - Google Patents

Process for breaking down cellulosic materials such as wood, straw and the like. like

Info

Publication number
DE528129C
DE528129C DEI29250D DEI0029250D DE528129C DE 528129 C DE528129 C DE 528129C DE I29250 D DEI29250 D DE I29250D DE I0029250 D DEI0029250 D DE I0029250D DE 528129 C DE528129 C DE 528129C
Authority
DE
Germany
Prior art keywords
wood
straw
breaking down
cellulosic materials
air
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
DEI29250D
Other languages
German (de)
Inventor
Dr Alfons Bayerl
Dr Heinrich Heimann
Dr Irnfried Petersen
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie AG
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
Priority claimed from DEI28588D external-priority patent/DE500567C/en
Priority claimed from DEI28793D external-priority patent/DE514856C/en
Application filed by IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to DEI29250D priority Critical patent/DE528129C/en
Priority to GB2246127A priority patent/GB279036A/en
Application granted granted Critical
Publication of DE528129C publication Critical patent/DE528129C/en
Expired legal-status Critical Current

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
    • D21C3/16—Pulping cellulose-containing materials with acids, acid salts or acid anhydrides nitrogen oxides; nitric acid nitrates, nitrites

Description

Verfahren zum Aufschließen von cellulosehaltigen Stoffen, wie Holz, Stroh u. dgl. Durch das Hauptpatent 500567 und das Zusatzpatent 514856 ist ein Verfahren zum Aufschließen von cellulosehaltigen Stoffen geschützt, das in einer Behandlung mit salpetersäurehaltiger Luft bzw. einer Imprägnierung mit verdünnter Salpetersäure und NacUbehandlung mit Luft besteht.Method for breaking down cellulosic materials such as wood, straw and the like. The main patent 500567 and the additional patent 514856 protect a method for breaking down cellulose-containing materials, which involves a treatment with nitric acid-containing air or an impregnation with dilute nitric acid and subsequent treatment with There is air.

Es wurde nun gefunden, daß ein Aufschluß ebenso erreicht wird, wenn die cellulosehaltigen Stoffe mit stickoxyd'haltiger Luft, wobei in der Faser Salpetersäure gebildet wird, und dann mehrere Stunden mit Luft allein behandelt werden. Der Aufschluß kann in der Kälte oder Wärme durchgeführt werden.It has now been found that digestion is also achieved when the cellulose-containing substances with nitrogen-containing air, with nitric acid in the fiber and then treated with air alone for several hours. The revelation can be done in the cold or warm.

Von dem bekannten Verfahren der Herstellung von Holzzellstoff mittels Einwirkung gasförmiger Stickoxyde auf lufttrockenes feingebrochenes Holz unterscheidet sich das vorliegende Verfahren dadurch, daß feuchte cellulosehaItige Stoffe mit Stickoxyden behandelt werden, wodurch sich Salpetersäure bildet, die ständig durch Zuführung von Luft ;regeneriert wird. Dadurch ist es möglich, den Aufschluß mit einer wesentlich geringeren Menge an Stickoxyden durchzuführen.From the known method of producing wood pulp by means of The effect of gaseous nitrogen oxides on air-dry, finely crushed wood is different the present process is characterized by the fact that moist cellulosic substances with Nitric oxides are treated, whereby nitric acid is formed, which is constantly flowing through Supply of air; being regenerated. This makes it possible to use the outcrop to carry out a much smaller amount of nitrogen oxides.

Beispiel über feuchtes Fichtenholz werden eine oder mehrere Stunden lang Stickoxyde, wie. sie beispielsweise beim Verbrennen eines Ammoniak-Luftgemisches in Gegenwart eines Kontaktes erhalten werden, bei 4o bis 50° C geleitet. Hierauf wird 24 Stunden mit etwa 50° C warmer Luft nachbehandelt. Der so erhaltene Aufschluß ist vollständig und splitterfrei. Die Aufarbeitung erfolgt in bekannter Weise.Example about damp spruce wood will be one or more hours long oxides of nitrogen, like. for example, when burning a mixture of ammonia and air obtained in the presence of a contact, passed at 40 to 50 ° C. On that is post-treated for 24 hours with air at around 50 ° C. The digestion thus obtained is complete and splinter-free. Working up is carried out in a known manner.

Claims (1)

PATI?NTANSPRUCIi Verfahren zum Aufschließen von cellulosehaltigen Stoffen, wie Holz, Stroh u. dgl., nach Patent 5oo 567, dadurch gekennzeichnet, d'aß die Rohstoffe zunächst mit Stickoxyden und dann mit Luft behandelt werden.PATI? NTANSPRUCIi method for digesting cellulose-containing Substances such as wood, straw and the like, according to Patent 5oo 567, characterized by d'ass the raw materials are first treated with nitrogen oxides and then with air.
DEI29250D 1926-07-21 1926-10-13 Process for breaking down cellulosic materials such as wood, straw and the like. like Expired DE528129C (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DEI29250D DE528129C (en) 1926-07-21 1926-10-13 Process for breaking down cellulosic materials such as wood, straw and the like. like
GB2246127A GB279036A (en) 1926-07-21 1927-08-26 A process for opening-up materials containing cellulose

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DEI28588D DE500567C (en) 1926-07-21 1926-07-21 Process for breaking down cellulosic materials such as wood, straw and the like. like
DEI28793D DE514856C (en) 1926-07-21 1926-08-13 Process for breaking down cellulosic materials such as wood, straw and the like. like
DEI29250D DE528129C (en) 1926-07-21 1926-10-13 Process for breaking down cellulosic materials such as wood, straw and the like. like

Publications (1)

Publication Number Publication Date
DE528129C true DE528129C (en) 1931-06-25

Family

ID=31950180

Family Applications (1)

Application Number Title Priority Date Filing Date
DEI29250D Expired DE528129C (en) 1926-07-21 1926-10-13 Process for breaking down cellulosic materials such as wood, straw and the like. like

Country Status (2)

Country Link
DE (1) DE528129C (en)
GB (1) GB279036A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4365059A (en) * 1981-08-03 1982-12-21 The United States Of America As Represented By The Secretary Of The Army Nitration of cellulose

Also Published As

Publication number Publication date
GB279036A (en) 1928-03-15

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