US3445178A - Depilation with a chlorite and hydrogen peroxide or a perborate - Google Patents
Depilation with a chlorite and hydrogen peroxide or a perborate Download PDFInfo
- Publication number
- US3445178A US3445178A US540856A US3445178DA US3445178A US 3445178 A US3445178 A US 3445178A US 540856 A US540856 A US 540856A US 3445178D A US3445178D A US 3445178DA US 3445178 A US3445178 A US 3445178A
- Authority
- US
- United States
- Prior art keywords
- chlorite
- perborate
- hydrogen peroxide
- hides
- unhairing
- 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 - Lifetime
Links
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 title description 19
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 title description 18
- 229910001919 chlorite Inorganic materials 0.000 title description 16
- 229910052619 chlorite group Inorganic materials 0.000 title description 16
- 230000035617 depilation Effects 0.000 title 1
- 239000000243 solution Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 11
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 description 11
- 229960002218 sodium chlorite Drugs 0.000 description 11
- 150000001875 compounds Chemical class 0.000 description 10
- 229960002163 hydrogen peroxide Drugs 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 239000002253 acid Substances 0.000 description 6
- 239000000460 chlorine Substances 0.000 description 6
- 210000004209 hair Anatomy 0.000 description 5
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 5
- 229960001922 sodium perborate Drugs 0.000 description 5
- YKLJGMBLPUQQOI-UHFFFAOYSA-M sodium;oxidooxy(oxo)borane Chemical compound [Na+].[O-]OB=O YKLJGMBLPUQQOI-UHFFFAOYSA-M 0.000 description 5
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 3
- 102000008186 Collagen Human genes 0.000 description 3
- 108010035532 Collagen Proteins 0.000 description 3
- 102000011782 Keratins Human genes 0.000 description 3
- 108010076876 Keratins Proteins 0.000 description 3
- 229910052801 chlorine Inorganic materials 0.000 description 3
- 229920001436 collagen Polymers 0.000 description 3
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 3
- 239000010985 leather Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 241000283690 Bos taurus Species 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 244000309466 calf Species 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 159000000011 group IA salts Chemical class 0.000 description 2
- -1 hydrogen peroxide Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000001099 ammonium carbonate Substances 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 239000011260 aqueous acid Substances 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000003637 basic solution Substances 0.000 description 1
- 229910021538 borax Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- QBWCMBCROVPCKQ-UHFFFAOYSA-M chlorite Chemical compound [O-]Cl=O QBWCMBCROVPCKQ-UHFFFAOYSA-M 0.000 description 1
- 229940077239 chlorous acid Drugs 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 235000021110 pickles Nutrition 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 229910000027 potassium carbonate Inorganic materials 0.000 description 1
- 235000011181 potassium carbonates Nutrition 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 239000004328 sodium tetraborate Substances 0.000 description 1
- 235000010339 sodium tetraborate Nutrition 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 229910000406 trisodium phosphate Inorganic materials 0.000 description 1
- 235000019801 trisodium phosphate Nutrition 0.000 description 1
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
- C14C1/06—Facilitating unhairing, e.g. by painting, by liming
Definitions
- the invention relates to a process for unhairing skins and hides with the aid of chlorites in an acid aqueous medium which renders it possible to hinder the evolution of C10 and C1 and to shorten the time required for the unhairing treatment while preserving the skins and hides which are to be processed to leather.
- the object of the invention is to provide a process for unhairing skins and hides with chlorites in an aqueous acid medium which avoids or at least reduces to a minimum the disadvantages described above of the production of C10 and C1 and the attack on the collagen engendered thereby.
- the essence of the invention resides in the addition of an inorganic per compound, such as, hydrogen peroxide, or compounds containing such compound as an adduct, such as, alkali metal perborates, to the chlorite solution.
- an alkali metal perborate such as sodium perborate
- chlorite such as sodium chlorite
- Equivalent proportions of other per compounds can be used.
- glycolic acid which was previously used to acidity the chlorite solutions, was used for the purpose of reducing the development of C10 but such acid is not in a position to avoid production of C10
- the present process permits use of cheap acids, both organic and inorganic, such as, formic acid, acetic acid, sulfuric acid or phosphoric acid, as the development of C10 is hindered or reduced to a minimum by the addition of the perborate or other equivalent per compound.
- the pH of the acid chlorite and per compound containing unhairing solutions employed according to the invention are adjusted to a pH of about 3.0 to 3.8.
- the acidified chlorite solutions employed according to the invention preferably contain about 30 g. to g. per liter of sodium chlorite or equivalent quantities of other chlorites.
- neutral salts or weakly alkaline salts sometime after the unhairing treatment has begun will cause a more rapid dissolution of the tough oxidation products of the hair which are formed and therefore renders such oxidation products more easy to remove.
- suitable neutral or weakly alkaline salts are ammonium sulfate, disodium hydrogen phosphate, ammonium carbonate, sodium bicarbonate, sodium carbonate, borax, potassium carbonate, trisodium phosphate, or eventually ammonia as base. These salts shall have a bufiering effect and resulting in a solution with a pH value of 7.0 or above. Besides, these salts must be easily soluble in water.
- the processing of the hides and skins with the above mentioned salts after having been treated with the acidified aqueous chlorite solution takes about from 5 to 20 hours, according to the kind of the raw materials.
- a precise definition of the moment when the treatment with the salt solution should begin cannot be given. This moment Will best be determined by removing a piece of the oxydatively treated hide and testing the solubility of the hairs in the salt solution.
- the necessary quantities of the above mentioned salts are lying between 0.5 and 4% relative to the weight of the hides. These quantities are dependent from the excessive amount of acid in the unhairing liquor. If the processing with the salt or Weak basic solution is done in a separate bath, it is sufiicient to add the salts in amounts from 0.5 to 3% in relation to the weight of the hides, to dissolve the hairs.
- Example 1 1000 kg. of cow hides were treated in a slowly moving drum with an aqueous solution which in 500 liters of H 0 contained 80 liters of an aqueous sodium chlorite solution containing 300 g. of NaClO /l. and l020 kg. of sodium perborate, the pH of which had been adjusted to 3.5 by the addition of formic acid.
- the unhairing of the hides was complete after about 15-20 hours treatment. The thus unhaired hides could then be tanned after a short pickle.
- Example 2 1000 kg. of calf skins were treated in a slowly moving drum with an aqueous solution which in 600-700 liters of water contained 100-110 liters of aqueous sodium chlorite (300 g./l.) and 25-30 kg. of sodium perborate, the pH of which had been adjusted to 3.3-3.6 with formic 3 acid.
- the unhairing of .the calf skins was complete after about 20-25 hours. After such unhairing and a short while the hides were ready for tanning.
- Example 3 100 kg. of cow hides which were previously soaked and fleshed are treated in a moving drum with a liquor comprising 50 liters of water, 12 to 13 liters of an aqueous solution of sodium chlorite containing 300 grams per liter of a 100% grade of sodium chlorite and 1 liter of 10 aqueous chlorite solution containing an effective amount 20 of an inorganic per compound selected from the group consisting of hydrogen peroxide and adducts of hydrogen peroxide to prevent substantial liberation of C10 and C1 during the unhairing treatment.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Cosmetics (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DED0046987 | 1965-04-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3445178A true US3445178A (en) | 1969-05-20 |
Family
ID=7050102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US540856A Expired - Lifetime US3445178A (en) | 1965-04-08 | 1966-04-07 | Depilation with a chlorite and hydrogen peroxide or a perborate |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3445178A (enrdf_load_stackoverflow) |
| BE (1) | BE679081A (enrdf_load_stackoverflow) |
| ES (1) | ES325059A1 (enrdf_load_stackoverflow) |
| FR (1) | FR1474603A (enrdf_load_stackoverflow) |
| GB (1) | GB1145359A (enrdf_load_stackoverflow) |
| NL (1) | NL6603805A (enrdf_load_stackoverflow) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4204992A (en) * | 1977-08-29 | 1980-05-27 | Avicon, Inc. | Method for preparing pyrogen free collagen |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR9102563A (pt) * | 1991-06-19 | 1993-02-09 | Brasil Peroxidos | Processo aperfeicoado para depliacao de peles animais |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3294479A (en) * | 1963-08-17 | 1966-12-27 | Hoechst Ag | Clo2 depilation and kerating removal from hides and skins |
-
1966
- 1966-03-23 NL NL6603805A patent/NL6603805A/xx unknown
- 1966-03-31 GB GB14281/66A patent/GB1145359A/en not_active Expired
- 1966-04-02 ES ES0325059A patent/ES325059A1/es not_active Expired
- 1966-04-05 FR FR56527A patent/FR1474603A/fr not_active Expired
- 1966-04-05 BE BE679081D patent/BE679081A/xx unknown
- 1966-04-07 US US540856A patent/US3445178A/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3294479A (en) * | 1963-08-17 | 1966-12-27 | Hoechst Ag | Clo2 depilation and kerating removal from hides and skins |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4204992A (en) * | 1977-08-29 | 1980-05-27 | Avicon, Inc. | Method for preparing pyrogen free collagen |
Also Published As
| Publication number | Publication date |
|---|---|
| BE679081A (enrdf_load_stackoverflow) | 1966-09-16 |
| GB1145359A (en) | 1969-03-12 |
| NL6603805A (enrdf_load_stackoverflow) | 1966-10-10 |
| FR1474603A (fr) | 1967-03-24 |
| ES325059A1 (es) | 1967-01-01 |
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