DE441770C - Process for the preparation of tanning agents from sulphite cellulose waste liquor - Google Patents

Process for the preparation of tanning agents from sulphite cellulose waste liquor

Info

Publication number
DE441770C
DE441770C DEB119092D DEB0119092D DE441770C DE 441770 C DE441770 C DE 441770C DE B119092 D DEB119092 D DE B119092D DE B0119092 D DEB0119092 D DE B0119092D DE 441770 C DE441770 C DE 441770C
Authority
DE
Germany
Prior art keywords
waste liquor
preparation
cellulose waste
tanning agents
sulphite cellulose
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
DEB119092D
Other languages
German (de)
Inventor
Dr Hermann Schuette
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
Application filed by IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to DEB119092D priority Critical patent/DE441770C/en
Application granted granted Critical
Publication of DE441770C publication Critical patent/DE441770C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
    • C14C3/00—Tanning; Compositions for tanning
    • C14C3/02—Chemical tanning
    • C14C3/08—Chemical tanning by organic agents
    • C14C3/24—Chemical tanning by organic agents using lignin derivatives, e.g. sulfate liquor

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)

Description

Verfahren zur Darstellung von Gerbinitteln aus Sulfiteelluloseablauge. Es wurde gefunden, daß man die gerbenden Eigenschaften der Swlfitcelluloseablauge, die in der Ledertechnik nur die Bedeutung eines Hilfsgerbstoffes besitzt, dadurch verbessern kann, daß man sie in alkalischer Lösung mit Schwefel kondensiert. Man verwendet dabei zweckmäßig eingedickte oder getrocknete Sulfitcelluloseablauge (Zellpech), roh oder gereinigt, und arbeitet unter so gemäßigten Reaktionsbedingungen, daß nur oder vorwiegend wasserlösliche Produkte entstehen. Diese Produkte haben die wertvolle Eigenschaft, in angesäuerter Lösung ein festes und gut durchgegerbtes Leder von angenehmer Farbe zu liefern. Beispiel. Ein Gemisch aus 5oo Gewichtsteilen einzredickter, roher Sulfitcelluloseablauge (von etwa 75 Prozent Trockengehalt), 8o Gewichtsteilen fein gepulvertem Schwefel, i 5o Volumteilen Natronlauge (4oo g Ätznatron im Liter) und i 5o Volumteilen Wasser wird unter Rühren und Rückflußkühlung so lange auf etwa i io bis i 15' erhitzt, bis die anfänglich starke Schwefelwasserstoffentwicklung deutlich nachgelassen hat. Man verdünnt dann das Reaktionsprodukt mit Wasser, filtriert gegebenenfalls von dem Ungelösten ab und dampft das neutralisierte Filtrat zur Trockne.Process for the preparation of tanning agents from sulphite cellulose waste liquor. It has been found that the tanning properties of the swlfit cellulose waste liquor, which in leather technology only has the significance of an auxiliary tanning agent, can be improved by condensing it with sulfur in an alkaline solution. Thickened or dried sulphite cellulose waste liquor (cell pitch), raw or purified, is expediently used, and the reaction conditions are so moderate that only or predominantly water-soluble products are formed. These products have the valuable property of delivering a firm and well-tanned leather of a pleasant color in an acidified solution. Example. A mixture of 500 parts by weight of concentrated, crude sulphite cellulose waste liquor (of about 75 percent dryness), 80 parts by weight of finely powdered sulfur, i 50 parts by volume of sodium hydroxide solution (400 g of caustic soda per liter) and i 50 parts by volume of water is stirred and refluxed to about io until i 15 ' heated until the initially strong evolution of hydrogen sulfide has clearly decreased. The reaction product is then diluted with water, any undissolved material is filtered off, and the neutralized filtrate is evaporated to dryness.

Das so erhaltene Produkt enthält etwa i i Prozent Schwefel; auf Zusatz von iprozentiger Eisenchloridlösung zu seiner schwach sauren, etwa iprozentigen wäßrigen Lösung entsteht eine braune, flockige Fällung.The product thus obtained contains about i percent sulfur; on addition from 1 percent ferric chloride solution to its weakly acidic, about 1 percent aqueous solution forms a brown, flaky precipitate.

Claims (1)

PATENTANSPRUCH: Verfahren zur Darstellung von Gerbmitteln aus Sulfitcelluloseablauge, dadurch gekennzeichnet, daß man die zweckmäßig eingedickte oder zur Trockne eingedampfe Ablauge in alkalischer Lösung unter derart milden Bedingungen mit Schwefel kondensiert, daß nur oder vorwiegend wasserlösliche Produkte entstehen.PATENT CLAIM: Process for the preparation of tanning agents from sulphite cellulose waste liquor, characterized in that the expediently thickened or evaporated to dryness Waste liquor condensed in alkaline solution under such mild conditions with sulfur, that only or predominantly water-soluble products are formed.
DEB119092D 1925-04-04 1925-04-04 Process for the preparation of tanning agents from sulphite cellulose waste liquor Expired DE441770C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEB119092D DE441770C (en) 1925-04-04 1925-04-04 Process for the preparation of tanning agents from sulphite cellulose waste liquor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB119092D DE441770C (en) 1925-04-04 1925-04-04 Process for the preparation of tanning agents from sulphite cellulose waste liquor

Publications (1)

Publication Number Publication Date
DE441770C true DE441770C (en) 1927-03-12

Family

ID=6994984

Family Applications (1)

Application Number Title Priority Date Filing Date
DEB119092D Expired DE441770C (en) 1925-04-04 1925-04-04 Process for the preparation of tanning agents from sulphite cellulose waste liquor

Country Status (1)

Country Link
DE (1) DE441770C (en)

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