DE898350C - Process for the production of tanning agents from sulphite waste liquor and lignin extracts - Google Patents
Process for the production of tanning agents from sulphite waste liquor and lignin extractsInfo
- Publication number
- DE898350C DE898350C DEB18337A DEB0018337A DE898350C DE 898350 C DE898350 C DE 898350C DE B18337 A DEB18337 A DE B18337A DE B0018337 A DEB0018337 A DE B0018337A DE 898350 C DE898350 C DE 898350C
- Authority
- DE
- Germany
- Prior art keywords
- waste liquor
- production
- sulphite waste
- tanning agents
- lignin extracts
- 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
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)
- Coloring (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Description
Verfahren zur Herstellung von Gerbmitteln aus Sulfitablauge und Ligninextrakten Wenn. von Schwermetallen freie Sulfitablauge oder Ligninextrakte mit (Fe(C N),) "" und bzw. oder (Fe (C N)")... zusammengebracht werden, findet eine Aufspaltung statt. Langsam bildet sich eine rotbraune Flüssigkeit als obere Schicht, während sich eine hellere bräunlich-gelbliche Schicht ablagert. Lichteinwirkung beschleunigt diese Aufspaltung, die wahrscheinlich durch (Fe (C N) s) "" oderbzw. und (Fe (C N) 6)... katalytisch bewirkt wird. Nach Abhebern der flüssigen oberen Schicht wird Wasser zugesetzt und mit der unteren Schicht gut verrührt. Wieder bildet sich langsam eine rotbraune obere flüssige Schicht, während die seich ablagernde Schicht heller wird. Diese Behandlung der unteren Schicht kann so weit, fortgesetzt werden, b.i,s sie weiß ist. Eine nach mehrmaligem Auswaschen auftretende Blaufärbung läßt sich vermeiden, wenn man dem Waschwasiser Alkali zusetzt. Die abgeheberten rotbraunen. Schichten können einzeln oder vereinigt getrocknet werden und geben eine rotbraune Substanz, die an der Luft allmählich in eine knetbare Masse übergeht. Diese Masse kann als ;syntlIetischer Gerbistoff angesprochen werden, denn. er zeugt beim Gerbe. nicht das, Nachdunkeln der Leder, wie es bei Sulfitablauge und Ligninextrakten auftritt, noch ist es nmtig, mit ihm in stark saurer Lösung zu gerben.Process for the production of tanning agents from sulphite waste liquor and lignin extracts Wenn. sulphite waste liquor free of heavy metals or lignin extracts are brought together with (Fe (CN),) "" and / or (Fe (CN) ") ..., a splitting takes place. Slowly a red-brown liquid forms as an upper layer while A lighter brownish-yellowish layer is deposited. The action of light accelerates this splitting, which is probably brought about by (Fe (CN) s) "" or or and (Fe (C N) 6) ... Water added and mixed well with the lower layer. Again a red-brown upper liquid layer slowly forms, while the self-deposited layer becomes lighter. This treatment of the lower layer can be continued until it is white. One after several times The blue coloration that occurs during washing out can be avoided by adding alkali to the washing water It gradually turns into a kneadable mass. This mass can be addressed as a synthetic tanning substance, because. he testifies at the tanning. not the darkening of the leather, as occurs with sulphite waste liquor and lignin extracts, nor is it necessary to tan with it in a strongly acidic solution.
Auch die abgelagerte untere Schicht kann nach dem Auswaschen als Gerbstoff verwendet werden. Beispiel zoo kg Sulfiüablauge werden unter Umrühren mit einer Lösung von 2o kg Kalüumferrocyanid in etwa 3001 Wasser versetzt. Nach einiger Zeit bildete sii#-h, durch Lichteinwirkung begünstigt, eine obere rotbraune flüssige Schicht über einer liehen unteren. Die obere Schicht wird entfernt und die untere mit Wasser so lange behandelt, bis sich die untere Schicht weißlich üblagerü. Um ihr Blauwerden zu verhindern, werden den letzten Zugaben von Wasser je 2o kg Nag CO., zugesetzt.The deposited lower layer can also be used as a tanning agent after washing. Example zoo kg of sulphite waste liquor are mixed with a solution of 20 kg of potassium ferrocyanide in about 300 liters of water while stirring. After a while, favored by the action of light, sii # -h formed an upper red-brown liquid layer over a borrowed lower one. The upper layer is removed and the lower layer is treated with water until the lower layer turns whitish. To prevent it from turning blue, 20 kg of Nag CO. Are added to the last additions of water.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB18337A DE898350C (en) | 1951-10-20 | 1951-10-20 | Process for the production of tanning agents from sulphite waste liquor and lignin extracts |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB18337A DE898350C (en) | 1951-10-20 | 1951-10-20 | Process for the production of tanning agents from sulphite waste liquor and lignin extracts |
Publications (1)
Publication Number | Publication Date |
---|---|
DE898350C true DE898350C (en) | 1953-11-30 |
Family
ID=6959707
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB18337A Expired DE898350C (en) | 1951-10-20 | 1951-10-20 | Process for the production of tanning agents from sulphite waste liquor and lignin extracts |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE898350C (en) |
-
1951
- 1951-10-20 DE DEB18337A patent/DE898350C/en not_active Expired
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