EP0059909B1 - Procédé de déchaulage de peaux - Google Patents

Procédé de déchaulage de peaux Download PDF

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Publication number
EP0059909B1
EP0059909B1 EP82101530A EP82101530A EP0059909B1 EP 0059909 B1 EP0059909 B1 EP 0059909B1 EP 82101530 A EP82101530 A EP 82101530A EP 82101530 A EP82101530 A EP 82101530A EP 0059909 B1 EP0059909 B1 EP 0059909B1
Authority
EP
European Patent Office
Prior art keywords
deliming
liquor
acid
der
minutes
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
EP82101530A
Other languages
German (de)
English (en)
Other versions
EP0059909A1 (fr
Inventor
Erwin Dr. Hahn
Dietrich Dr. Lach
Kurt Dr. Schneider
Rainer Dr. Strickler
Rolf Streicher
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Priority to AT82101530T priority Critical patent/ATE6164T1/de
Publication of EP0059909A1 publication Critical patent/EP0059909A1/fr
Application granted granted Critical
Publication of EP0059909B1 publication Critical patent/EP0059909B1/fr
Expired legal-status Critical Current

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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
    • C14C1/00—Chemical treatment prior to tanning
    • C14C1/08—Deliming; Bating; Pickling; Degreasing

Definitions

  • the invention relates to a process for deliming skins, in which cyclic carbonates of polyhydric aliphatic alcohols are used as the “safety deliming agent”. This avoids the disadvantages associated with overdosing the known deliming agents.
  • Ashes of the skins for the purpose of depilation and skin disruption in the context of leather production are carried out in an alkaline medium, usually with the help of inorganic or organic sulfides.
  • Lime is usually used as the alkaline agent, usually alone, but occasionally also in a mixture with caustic soda or soda.
  • the liming chemicals, especially the lime have to be freed from the material in preparation for further processing, that is, «descaled.
  • acids or acid salts e.g. B. phthalic acid, sulfophthalic acid, formic acid, acetic acid, boric acid, aliphatic dicarboxylic acid mixtures, hydrochloric acid, sulfuric acid and their ammonium salts.
  • acids or acid salts e.g. B. phthalic acid, sulfophthalic acid, formic acid, acetic acid, boric acid, aliphatic dicarboxylic acid mixtures, hydrochloric acid, sulfuric acid and their ammonium
  • butyrolactone as a deliming agent is known from DE-C-804827. This inner ester hydrolyzes very slowly under the usual descaling conditions. The necessary descaling times are therefore very long. This is probably the reason why butyrolactone has not found its way into practice.
  • hydrolyzing esters are used under the descaling conditions. They overcome the above-mentioned disadvantages of conventional decalcifying agents by not dropping the pH below 5 and also being free of ammonium salts. However, they too cannot prevent hydrogen sulfide from being released when they are overdosed. Due to the high toxicity of hydrogen sulfide, this possibility represents a constant latent danger to life for the staff, apart from the unpleasant smell.
  • the invention was therefore based on the object of developing a deliming process which not only avoids the disadvantages of the usual deliming agents mentioned above, but also the development of hydrogen sulfide with certainty.
  • cyclic carbonates of polyhydric aliphatic alcohols preference is given to those whose equivalent weight (with respect to the carbonic acid component, not the alcohol component) is below 150, preferably below 100 and in particular below 60.
  • Suitable carbonates are accordingly the carbonic diesters of polyhydric, if appropriate still free hydroxyl groups, of polyhydric, that is to say more than one, preferably 2 to 3, in particular 2 hydroxyl group-containing, aliphatic alcohols having 2 to 6, preferably 2 to 3, carbon atoms, at least 2 hydroxyl groups being linked to one another
  • Suitable carbonates are arranged in the 1,3- or preferably 1,2-position, for example the cyclic carbonates of 1,2-butanediol, 2,3-butanediol, neopentyl glycol, glycerol, the dicarbonate of pentaerythritol (spiro compound), preferably the cyclic carbonate from Ethylene glycol and 1,2-propylene glycol.
  • the carbonates are prepared in a known manner, e.g. B. by reaction of the alcohols with phosgene or preferably of epoxides with carbon dioxide.
  • the carbonate is hydrolyzed by the limestone contained in the liming so far until a pH value in the range of - depending on the carbonate excess -7.8 to 7.5 is reached.
  • the lime is dissolved as calcium bicarbonate. Then the hydrolysis stops.
  • the pH did not fall below 7.5 in any experiment. This range is optimal, because on the one hand this ensures that no hydrogen sulfide escapes from the solution, and on the other hand the pH is not higher than absolutely necessary to avoid the formation of hydrogen sulfide. Too high pH values are also undesirable with regard to the grain smoothness and the feel of the leather as well as the safety of limescale removal.
  • the amounts used for the carbonate depend on the content of lime and other basic compounds (e.g. sodium sulfide and sodium hydroxide) in the skin material. They are of the order of 0.8 to 4%, preferably 1 to 2%, based on the weight of the wet hides.
  • the carbonates are preferably dissolved in water.
  • the emulsification or dispersion of insufficiently water-soluble carbonates can be carried out in the usual way with cationic, anionic or nonionic emulsifiers. It is in no way problematic.
  • Example 1 was repeated in exactly the same way, except that a commercially available product based on the ammonium salt of sulfophthalic acid was used as the deliming agent. After 5 minutes of walking, the pH of the decalcifying liquor was measured at 3.2, 15 minutes later it had risen to 7, and then after 40 minutes of walking it adjusted to the final pH of 8.6.
  • Example 2 100 parts of bare bark were always decalcified. The test results are summarized in the table.

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)
  • Detergent Compositions (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Peptides Or Proteins (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)

Claims (1)

  1. Procédé de déchaulage des peaux pelanées, de manière usuelle, dans des conditions de déchaulage usuelles, concernant la longueur de bain, la température, le pH du bain, sur une durée de une à six heures, caractérisé par le fait qu'on utilise, comme agent actif, le carbonate cyclique, à 5 ou 6 termes cycliques, d'un alcool aliphatique polyvalent, à 2 à 6 atomes de carbone.
EP82101530A 1981-03-06 1982-02-27 Procédé de déchaulage de peaux Expired EP0059909B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82101530T ATE6164T1 (de) 1981-03-06 1982-02-27 Verfahren zum entkaelken von haeuten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3108428 1981-03-06
DE19813108428 DE3108428A1 (de) 1981-03-06 1981-03-06 Verfahren zum entkaelken von haeuten

Publications (2)

Publication Number Publication Date
EP0059909A1 EP0059909A1 (fr) 1982-09-15
EP0059909B1 true EP0059909B1 (fr) 1984-02-08

Family

ID=6126452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82101530A Expired EP0059909B1 (fr) 1981-03-06 1982-02-27 Procédé de déchaulage de peaux

Country Status (4)

Country Link
US (1) US4377387A (fr)
EP (1) EP0059909B1 (fr)
AT (1) ATE6164T1 (fr)
DE (2) DE3108428A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12612670B2 (en) 2021-01-22 2026-04-28 Tfl Ledertechnik Gmbh Deliming composition and method for deliming hides

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3527013A1 (de) * 1985-07-27 1987-02-05 Basf Ag Verfahren zum entkaelken von haeuten und verwendung von cyclischen estern der schwefligen saeure als entkaelkungsmittel
RU2157409C1 (ru) * 1999-12-09 2000-10-10 Центральный научно-исследовательский институт кожевенно-обувной промышленности Способ обработки голья
RU2156304C1 (ru) * 1999-12-09 2000-09-20 Центральный научно-исследовательский институт кожевенно-обувной промышленности Способ обработки голья
EP3425068B1 (fr) * 2017-07-06 2021-08-04 Stahl International B.V. Agent de déchaulage exempt d'ammonium et d'acide borique, ses utilisations, processus de détartrage
NL2027083B1 (en) * 2020-12-09 2022-07-07 Stahl Int B V Process for deliming of hides, skins or pelts

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE804827C (de) 1948-10-02 1951-04-30 Basf Ag Entkaelken von Bloessen
DE2825081C2 (de) * 1978-06-08 1980-06-12 Basf Ag, 6700 Ludwigshafen Verfahren zum Entkälken von Häuten

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12612670B2 (en) 2021-01-22 2026-04-28 Tfl Ledertechnik Gmbh Deliming composition and method for deliming hides

Also Published As

Publication number Publication date
US4377387A (en) 1983-03-22
ATE6164T1 (de) 1984-02-15
DE3108428A1 (de) 1982-09-23
DE3260040D1 (en) 1984-03-15
EP0059909A1 (fr) 1982-09-15

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