US2266448A - Process and products for deliming limed pelts - Google Patents

Process and products for deliming limed pelts Download PDF

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Publication number
US2266448A
US2266448A US254008A US25400839A US2266448A US 2266448 A US2266448 A US 2266448A US 254008 A US254008 A US 254008A US 25400839 A US25400839 A US 25400839A US 2266448 A US2266448 A US 2266448A
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US
United States
Prior art keywords
pelts
deliming
acid
water
limed
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Expired - Lifetime
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US254008A
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English (en)
Inventor
Trosken Otto
Pense Walter
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GAF Chemicals Corp
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General Aniline and Film Corp
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S424/00—Drug, bio-affecting and body treating compositions
    • Y10S424/06—Chelate

Definitions

  • the present invention relates to a process and products for delimingv limed pelts.
  • the elimination of the lime-from limed pelts is one of the most important operations which must be effected when the pelts are prepared for the tanning process. It is necessary that the pelts are delimed as quickly as possible and without damaging the hide material.
  • the lime which remains in the pelts subjected to an incomplete deliming can bring about, as is known, various defectsappearlng in the course of further working up. With the carbonates or bicarbonates dissolved in the water, for instance, the lime easily forms insoluble precipitates which on the finished leather appear as lime blast, an inconvenience which is especially disagreeable in the case of fancy leather.
  • deliming is effected by means of inorganic or organic acids, such as, for instance hydrochloric acid, sulfurous acid, sulfuric acid, formic acid, acetic acid, lactice acid, glycolic acid or butyric acid, which acids are used, if desired, in the form of their acid salts or their ammonium compounds, or also by means of the so-called bates, such as dungbates, pancreas extracts, bacterial bates or artificial bates.
  • inorganic or organic acids such as, for instance hydrochloric acid, sulfurous acid, sulfuric acid, formic acid, acetic acid, lactice acid, glycolic acid or butyric acid, which acids are used, if desired, in the form of their acid salts or their ammonium compounds, or also by means of the so-called bates, such as dungbates, pancreas extracts, bacterial bates or artificial bates.
  • bates such as dungbates, pancreas extracts, bacterial
  • Acids of the above-indicated kind are, forinstance': nitrilotriacetic acid and its substitution products-such as C-methylor C-phenyl-nitrilo-triacetic acid, ethylene-bis-imino-diacetic acid, furthermore imino-diacetic acid and its derivatives substituted at the nitrogen.
  • nitrilotriacetic acid and its substitution products such as C-methylor C-phenyl-nitrilo-triacetic acid, ethylene-bis-imino-diacetic acid, furthermore imino-diacetic acid and its derivatives substituted at the nitrogen.
  • substitution products such as C-methylor C-phenyl-nitrilo-triacetic acid, ethylene-bis-imino-diacetic acid, furthermore imino-diacetic acid and its derivatives substituted at the nitrogen.
  • atom for instance N-methy1-, N-butylimino-diace
  • the salts of the above-named amino-carboxyli'c acids are distinguished by the'fact that they form water-soluble complex salts to bind the lime boundby the hide, the calcium compounds such as calcium carbonate present on the surface of the hide and the lime soap formed by decomposition of saponified hide fat.
  • the calcium is no longer capable of entering into reaction, so that reaction which might take place in the courseof the tanning process, for instance with the bicarbonates dissolved in the water or with tanning agents, are
  • the hitherto known deliming agents are capable of removing only the lime which is mechanically bound to the hide or which is dis-' solved in the water absorbed by the capillary action of the hide.
  • salts of the above-named, amino-carboxylic acids may also be used together withthe usual deliming agents or with the bating agents I is distinctly smoother.
  • the amino-carboxylates may be applied either before or after or also simultaneously with the usual deliming and bating agents. 4
  • Example 1 the ,trisodium s'altlof nitrilo-triacetic acid, calculated' upon the pelt weight; After a twelve hours treatment and after rinsing, the pelts are delimed and may directly be worked up.
  • Example 2 Limed cow pelts are, after soaking, delimed in a bath containing 2.5% of the tetrasodium salt of ethylene-bis-imino-diacetic acid, calculated upon the pelt weight.
  • Limed calfskins are rinsed for a short time and then introduced into a bath containing 4% of the trisodium salt of 1-aminobenzene-N.N- diacetic acid-ortlro-carboxyllc acid, calculated upon the pelt weight. After a 20 hours treatment and subsequent rinsing, the material is delimed.
  • Example 4 A 100 kg. of calfskins are limed in a lime-pit containing 1 cubic meter of water, 1 kg. of concentrated sodium sulfide and 6 kg. of quicklime; after rinsing, they are treated, for one hour with 0.300
  • Example 6 100 kg. of limed sheep pelts are treated with 200 liters of water having a temperature of 35 C., 1 kg. of lactic acid and 0.015 kg. of the trisodium salt of 1-aminobenzene-N.N-diacetic acidortho-carbox'ylic acid. After 1 hours, the pelts are well delimed and may, in this state, be subjected to tanning.
  • Example 7 100 kg. of cow pelts are fulled, for one hour, with 300-liters of water and 0.100 kg. of the tetra: sodium salt of ethylene-bis-imino-diacetic acid. The bath is then mixed with 0.100 kg. of hydrochloric acid and, after another hour, with 0.200 kg. of hydrochloric acid. After a further hour, the pelts are sufllciently free from lime for being subjected to further tanning. Pelts treated, for comparative purposes, without the addition of the tetra-sodium salt or ethylene-bis-imino-diacetic acid, show in the cut a considerably intenser red dyeing with phenolphthalein.
  • Example 8 100 kg. of cow pelts are lulled, ior'two hours,
  • Example 9 100 kg. of limed goat skins are fulled, for one hour, with 0.200 kg. oi! formic acid and'0.500 kg. of the tetrasodium salt of ethylene-bis-iminodiacetic acid and then rinsed for half-an-hour.
  • the pelts thus treated are distinguished by a smooth Iceland a good depletion.
  • Example 10 100 kg. of limed calfskins are rinsed and treated, for one hour, with 0200 kg. of a concentrated pancreas extract and 0.250 kg. of the trisodium salt of 'nitrilo-triacetic acid. After about hour's rinsing, the pelts maybe used for further tanning; they are distinguished by a I smooth feel of the grain .and byfa good depletion.
  • Deliming agents consisting essentially of water-soluble salts of carboxylic acids containing nitrogen and at least 2 organic radicals substituted by carboxyl groups in alpha-position to a nitrogen atom.
  • Deliming agents comprising a water-soluble salt of nitrilo-triacetic acid.
  • Deliming agents comprising a water-soluble salt of l-amino-benzene-NN-diacetic acid-orthocarboxylic acid.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
  • Indole Compounds (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
US254008A 1938-02-07 1939-02-01 Process and products for deliming limed pelts Expired - Lifetime US2266448A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1938I0060457 DE693065C (de) 1938-02-07 1938-02-07 Verfahren zum Entkaelken von geaescherten Haeuten und Fellen

Publications (1)

Publication Number Publication Date
US2266448A true US2266448A (en) 1941-12-16

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US254008A Expired - Lifetime US2266448A (en) 1938-02-07 1939-02-01 Process and products for deliming limed pelts

Country Status (4)

Country Link
US (1) US2266448A (de)
DE (1) DE693065C (de)
FR (1) FR849935A (de)
GB (1) GB524788A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556649A (en) * 1948-06-23 1951-06-12 Heinemann Felix Deliming and deswelling hides with beet sugar molasses waste liquor extract
US4213760A (en) * 1978-06-08 1980-07-22 Basf Aktiengesellschaft Deliming of hides
US4229175A (en) * 1977-04-02 1980-10-21 Basf Aktiengesellschaft Lime-free and sulfide-free liming process

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3425068B1 (de) * 2017-07-06 2021-08-04 Stahl International B.V. Ammonium- und borsäurefreies entkälkungsmittel seine verwendungen und entkälkungsverfahren

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556649A (en) * 1948-06-23 1951-06-12 Heinemann Felix Deliming and deswelling hides with beet sugar molasses waste liquor extract
US4229175A (en) * 1977-04-02 1980-10-21 Basf Aktiengesellschaft Lime-free and sulfide-free liming process
US4213760A (en) * 1978-06-08 1980-07-22 Basf Aktiengesellschaft Deliming of hides

Also Published As

Publication number Publication date
FR849935A (fr) 1939-12-05
GB524788A (en) 1940-08-14
DE693065C (de) 1940-07-01

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