EP3094754B1 - Zusammensetzung für wasserfreie chrom-gerbung von tierhäuten ohne pickelschritt - Google Patents

Zusammensetzung für wasserfreie chrom-gerbung von tierhäuten ohne pickelschritt Download PDF

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Publication number
EP3094754B1
EP3094754B1 EP14786723.8A EP14786723A EP3094754B1 EP 3094754 B1 EP3094754 B1 EP 3094754B1 EP 14786723 A EP14786723 A EP 14786723A EP 3094754 B1 EP3094754 B1 EP 3094754B1
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EP
European Patent Office
Prior art keywords
composition
skins
hides
tanning
range
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.)
Not-in-force
Application number
EP14786723.8A
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English (en)
French (fr)
Other versions
EP3094754A1 (de
Inventor
Chellappa Muralidharan
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.)
Council of Scientific and Industrial Research CSIR
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Council of Scientific and Industrial Research CSIR
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Publication of EP3094754A1 publication Critical patent/EP3094754A1/de
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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
    • C14C3/04—Mineral tanning
    • C14C3/06—Mineral tanning using chromium compounds

Definitions

  • the present disclosure relates to a composition for water free, pickle free chrome tanning of hides/skins for improved chrome tanning process.
  • the present disclosure further relates to a process for chrome tanning using the said composition, whereby the tanning process is carried out as a waterless, salt free system without adding any additional medium.
  • the present disclosure is envisaged to have tremendous application potential in the tanning industry to ensure eco-benign leather processing that does not add to environmental pollution.
  • the present disclosure is therefore envisaged to play a crucial role in enhancing the economic and environmental benefits associated with chrome tanning.
  • Salted hides and skins are the major raw materials for the tanning industry.
  • the first operation carried out is the removal of salt in the hides and skins through repeated washings.
  • the hair and flesh are loosened by treatment with lime and sodium sulfide or enzyme and then removed using knives.
  • the hides and skins are then agitated with acid salts like ammonium chloride for removal of residual lime.
  • the operation is called deliming, which is usually carried out in tanning drum.
  • the resulting delimed hides and skins are subjected to pickling using 10% salt (all percentages mentioned are on the basis of weight of hides and skins) and 1% mineral acid in the hitherto known process, in order to bring down the pH of the delimed stock, which is around 8.0 to 2.8 to 3.0 to facilitate uptake as well as penetration of chrome tanning salt (commonly known as basic chromium sulfate - BCS) in the cross section of the hides and skins to be tanned. While the penetration of BCS in hides and skins during chrome tanning is carried out at pH 2.8 to 3.0, the same is raised to 3.8 to 4.0 for fixation, which is known as basification in the industry.
  • 10% salt all percentages mentioned are on the basis of weight of hides and skins
  • mineral acid in the hitherto known process
  • Alkaline salts of weak organic acids which are normally referred to as masking salts are added during chrome tanning process to prevent surface fixation of chromium in hides and skins. All these operations are carried out in aqueous medium. It is very important in this regard that a significant portion of the chemicals used in the process is let out in the effluent.
  • the conventional chrome tanning process is associated with generation of enormous amount of waste water containing a lot of unabsorbed chemicals leading to significant pollution as well as disposal problem. This obviously leads to an alarming situation especially in view of the ever growing scarcity of usable water.
  • Indian patent application no. 2108/DEL/2008 describes a novel chrome composition
  • a novel chrome composition comprising essentially three components - [a] basic chromium sulfate, having Cr 2 O 3 content in the range of 21-25% (weight / weight of basic chromium sulfate), [b] alkali earth metal oxide; and[c] alkali metal salt of organic acid having carbon chain of length in the range of one to three; wherein the ratio of [a] : [b] : [c] is in the range of 10:0.25:0.88 to 10:0.38:1.25.
  • the method of using this composition for tanning purpose involves use of alkali dissolved in water and added in feeds of equal installments to attain a pH of 4.0 - 4.2 in aqueous medium for completion of tanning wherein the acid liberated during hydrolysis of chromium is neutralized.
  • the major feature of using this composition in chrome tanning involves avoiding pickling operation, thereby ensuring that effluent is not loaded with enormous salinity as well as TDS.
  • the main objective of the present disclosure is to provide a composition for water free, pickle free chrome tanning of hides/skins for improved chrome tanning process which obviates the limitations as stated above.
  • Another objective of the present disclosure is to provide a process for chrome tanning without resorting to use of water for tanning.
  • Yet another objective of the present disclosure is to provide a tanning process without resorting to pickling.
  • compositions for water free, pickle free chrome tanning of hides/skins wherein said composition comprises:
  • the composition has pH iin the range of 1-6.
  • Cr 2 O 3 : SO 4 ratio is in the range of 1:2.2 to 1:2.6.
  • the alkali metal salt of organic acid used is selected from sodium formate, sodium acetate, sodium citrate.
  • the polyhydric alcohol used is selected from sorbitol, mannitol, glycerine.
  • the ratio of polyhydric alcohol and basic chromium sulfate is in the range of 0.3:1 to 1:1.
  • the acid used for acidification of polyhydric alcohol is selected from sulfuric acid, acetic acid, formic acid.
  • a process for chrome tanning characterized in that it uses the said composition, wherein the steps comprise treatment of delimed hide/skin with 10 to 20% w/w of the said composition for a period in the range of 1-12 hours, preferably under stirring condition to obtain the chrome tanned hide/skin.
  • Basic chromium sulfate is mixed with alkali metal salt of organic acid having carbon chain of length one to three in a ratio in the range of 1:0.25 to 1:0.5 and then mixed with acidified polyhydric alcohol, characterized by carbon chain length of 3-6, adjusted at a pH in the range of 1-6.
  • the amount of polyhydric alcohol is in a ratio 0.3:1 to 1:1 with basic chromium sulfate.
  • the mixture is preferably subjected to stirring for a period of 20 minutes to obtain the novel tanning composition.
  • the composition exhibits the following characteristics:
  • the composition is used for chrome tanning. Delimed hides and skins are treated with 10-20 % w/w, of the novel tanning composition without addition of water under agitation for a period of 1-12 hrs to get chrome tanned hide/skin.
  • the inventive step of the present invention lies in providing a dispersion to enable the chrome tanning process to be carried out not only without adding water, but also eliminating the pickling and basification operations.

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)

Claims (6)

  1. Zusammensetzung für wasserfreie Chromgerbung von Tierhäuten ohne Pickelschritt, umfassend:
    [a] basisches Chromsulfat mit einem Cr2O3-Gehalt im Bereich von 21-25 % (Gewicht/Gewicht des basischen Chromsulfats);
    [b] Alkalimetallsalz einer organischen Säure mit einer Kohlenstoffkette mit einer Länge im Bereich von eins bis drei;
    [c] mehrwertigen Alkohol, zuvor mit Säure angesäuert;
    wobei das Verhältnis von [a] : [b] : [c] im Bereich von 1 : 0,25 : 0,3 bis 1 : 0,5 : 1 liegt.
  2. Zusammensetzung nach Anspruch 1, wobei der pH der Zusammensetzung im Bereich von 1-6 liegt.
  3. Zusammensetzung nach Anspruch 1, wobei das Alkalimetallsalz der organischen Säure aus Natriumformiat, Natriumacetat, Natriumcitrat ausgewählt ist.
  4. Zusammensetzung nach Anspruch 1, wobei dem mehrwertigen Alkohol aus Sorbit, Mannit, Glycerin ausgewählt ist.
  5. Zusammensetzung nach Anspruch 1, wobei die Säure, die zum Ansäuern des mehrwertigen Alkohols verwendet wird, aus Schwefelsäure, Essigsäure, Ameisensäure ausgewählt ist.
  6. Verfahren zur Chromgerbung von Tierhäuten durch Behandeln einer entkälkten Tierhaut mit 10 bis 20 Gew.-% der Zusammensetzung nach Anspruch 1 für einen Zeitraum im Bereich von 1-12 Stunden, vorzugsweise unter Rühren, um die chromgegerbte Tierhaut zu erhalten.
EP14786723.8A 2014-01-13 2014-08-29 Zusammensetzung für wasserfreie chrom-gerbung von tierhäuten ohne pickelschritt Not-in-force EP3094754B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IN85DE2014 IN2014DE00085A (de) 2014-01-13 2014-01-13
PCT/IN2014/000555 WO2015104716A1 (en) 2014-01-13 2014-08-29 A composition for water free, pickle free chrome tanning of hides/skins

Publications (2)

Publication Number Publication Date
EP3094754A1 EP3094754A1 (de) 2016-11-23
EP3094754B1 true EP3094754B1 (de) 2018-03-28

Family

ID=51753266

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14786723.8A Not-in-force EP3094754B1 (de) 2014-01-13 2014-08-29 Zusammensetzung für wasserfreie chrom-gerbung von tierhäuten ohne pickelschritt

Country Status (7)

Country Link
EP (1) EP3094754B1 (de)
CN (1) CN106414777B (de)
BR (1) BR112016016270A2 (de)
IN (1) IN2014DE00085A (de)
TR (1) TR201809066T4 (de)
WO (1) WO2015104716A1 (de)
ZA (1) ZA201605336B (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201600130372A1 (it) * 2016-12-22 2018-06-22 Conceria Giardini S R L Processo ci conciatura di pelli
EP3635141A4 (de) * 2017-05-25 2021-02-24 Council of Scientific and Industrial Research Dispergiermittelzusammensetzung zur anwendung bei der gerbung und verfahren zu ihrer herstellung
CN111556901B (zh) * 2017-11-24 2022-07-08 科学与工业研究委员会 可用于无水鞣制中的预处理的组合物及相应的鞣制方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2134070C3 (de) * 1971-07-08 1975-09-25 Bayer Ag, 5090 Leverkusen Pulverförmige Mischungen zum Gerben von tierischen Häuten oder Nachgerben von Leder
FR2649413B1 (fr) * 1989-07-10 1993-05-28 Toulouse Inst Nat Polytech Procede de tannage de peaux
EP1485508A1 (de) 2002-02-28 2004-12-15 Council Of Scientific And Industrial Research Verfahren zur herstellung von chromgegerbten ledern

Also Published As

Publication number Publication date
BR112016016270A2 (pt) 2017-08-08
EP3094754A1 (de) 2016-11-23
ZA201605336B (en) 2017-11-29
WO2015104716A1 (en) 2015-07-16
CN106414777A (zh) 2017-02-15
TR201809066T4 (tr) 2018-07-23
CN106414777B (zh) 2018-04-10
IN2014DE00085A (de) 2015-07-17

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