US528162A - Christian heinzerling - Google Patents
Christian heinzerling Download PDFInfo
- Publication number
- US528162A US528162A US528162DA US528162A US 528162 A US528162 A US 528162A US 528162D A US528162D A US 528162DA US 528162 A US528162 A US 528162A
- Authority
- US
- United States
- Prior art keywords
- chromic
- acid
- salts
- chromium
- leather
- 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
- KRVSOGSZCMJSLX-UHFFFAOYSA-L Chromic acid Chemical class O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 74
- 239000010985 leather Substances 0.000 description 34
- 239000011651 chromium Substances 0.000 description 32
- VYZAMTAEIAYCRO-UHFFFAOYSA-N chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 30
- 229910052804 chromium Inorganic materials 0.000 description 30
- 150000001875 compounds Chemical class 0.000 description 30
- 239000002253 acid Substances 0.000 description 22
- 150000003839 salts Chemical class 0.000 description 20
- 239000011780 sodium chloride Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 16
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- WGLPBDUCMAPZCE-UHFFFAOYSA-N trioxochromium Chemical class O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 12
- 239000001117 sulphuric acid Substances 0.000 description 10
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- 239000000835 fiber Substances 0.000 description 8
- 159000000011 group IA salts Chemical class 0.000 description 8
- 235000011149 sulphuric acid Nutrition 0.000 description 8
- DHCDFWKWKRSZHF-UHFFFAOYSA-L thiosulfate(2-) Chemical compound [O-]S([S-])(=O)=O DHCDFWKWKRSZHF-UHFFFAOYSA-L 0.000 description 8
- LSNNMFCWUKXFEE-UHFFFAOYSA-L Sulphite Chemical compound [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 6
- 235000020127 ayran Nutrition 0.000 description 6
- 150000001845 chromium compounds Chemical class 0.000 description 6
- 229910000424 chromium(II) oxide Inorganic materials 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- MUBZPKHOEPUJKR-UHFFFAOYSA-N oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- LSNNMFCWUKXFEE-UHFFFAOYSA-N sulfonic acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- LKZCRGABYQYUFX-UHFFFAOYSA-L barium(2+);dithiocyanate Chemical compound [Ba+2].[S-]C#N.[S-]C#N LKZCRGABYQYUFX-UHFFFAOYSA-L 0.000 description 4
- ABXXWVKOBZHNNF-UHFFFAOYSA-N chromium(3+);dioxido(dioxo)chromium Chemical compound [Cr+3].[Cr+3].[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O ABXXWVKOBZHNNF-UHFFFAOYSA-N 0.000 description 4
- GRWVQDDAKZFPFI-UHFFFAOYSA-H chromium(III) sulfate Chemical compound [Cr+3].[Cr+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRWVQDDAKZFPFI-UHFFFAOYSA-H 0.000 description 4
- 239000011696 chromium(III) sulphate Substances 0.000 description 4
- 235000015217 chromium(III) sulphate Nutrition 0.000 description 4
- GRWZHXKQBITJKP-UHFFFAOYSA-L dithionite(2-) Chemical class [O-]S(=O)S([O-])=O GRWZHXKQBITJKP-UHFFFAOYSA-L 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- MBMLMWLHJBBADN-UHFFFAOYSA-N iron-sulfur Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 235000010755 mineral Nutrition 0.000 description 4
- 150000005324 oxide salts Chemical class 0.000 description 4
- 229910052950 sphalerite Inorganic materials 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 229910052984 zinc sulfide Inorganic materials 0.000 description 4
- MROJXXOCABQVEF-UHFFFAOYSA-N Actarit Chemical compound CC(=O)NC1=CC=C(CC(O)=O)C=C1 MROJXXOCABQVEF-UHFFFAOYSA-N 0.000 description 2
- 235000007575 Calluna vulgaris Nutrition 0.000 description 2
- 240000002804 Calluna vulgaris Species 0.000 description 2
- XBWRJSSJWDOUSJ-UHFFFAOYSA-L Chromium(II) chloride Chemical compound Cl[Cr]Cl XBWRJSSJWDOUSJ-UHFFFAOYSA-L 0.000 description 2
- JVBXVOWTABLYPX-UHFFFAOYSA-L Sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 description 2
- PENRVBJTRIYHOA-UHFFFAOYSA-L Zinc dithionite Chemical compound [Zn+2].[O-]S(=O)S([O-])=O PENRVBJTRIYHOA-UHFFFAOYSA-L 0.000 description 2
- CAMQADMTPPKJBO-UHFFFAOYSA-L [Mn+2].[O-]S(=O)S([O-])=O Chemical compound [Mn+2].[O-]S(=O)S([O-])=O CAMQADMTPPKJBO-UHFFFAOYSA-L 0.000 description 2
- FAXBKWZNFXXLSK-UHFFFAOYSA-L [Mn+2].[O-]S([O-])(=O)=S Chemical compound [Mn+2].[O-]S([O-])(=O)=S FAXBKWZNFXXLSK-UHFFFAOYSA-L 0.000 description 2
- 150000001447 alkali salts Chemical class 0.000 description 2
- MHCAFGMQMCSRGH-UHFFFAOYSA-N aluminum;hydrate Chemical compound O.[Al] MHCAFGMQMCSRGH-UHFFFAOYSA-N 0.000 description 2
- 125000004429 atoms Chemical group 0.000 description 2
- 159000000009 barium salts Chemical class 0.000 description 2
- ONPIOWQPHWNPOQ-UHFFFAOYSA-L barium(2+);dioxido-oxo-sulfanylidene-$l^{6}-sulfane Chemical compound [Ba+2].[O-]S([O-])(=O)=S ONPIOWQPHWNPOQ-UHFFFAOYSA-L 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 2
- 229960000359 chromic chloride Drugs 0.000 description 2
- QSWDMMVNRMROPK-UHFFFAOYSA-K chromium(3+) trichloride Chemical compound [Cl-].[Cl-].[Cl-].[Cr+3] QSWDMMVNRMROPK-UHFFFAOYSA-K 0.000 description 2
- YRTKBCIAQCXVCM-UHFFFAOYSA-K chromium(3+);trithiocyanate Chemical compound [Cr+3].[S-]C#N.[S-]C#N.[S-]C#N YRTKBCIAQCXVCM-UHFFFAOYSA-K 0.000 description 2
- 229910000334 chromium(II) sulfate Inorganic materials 0.000 description 2
- 239000011636 chromium(III) chloride Substances 0.000 description 2
- 235000007831 chromium(III) chloride Nutrition 0.000 description 2
- 229940109126 chromous chloride Drugs 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000001627 detrimental Effects 0.000 description 2
- NINOVVRCHXVOKB-UHFFFAOYSA-N dialuminum;dioxido(dioxo)chromium Chemical compound [Al+3].[Al+3].[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O.[O-][Cr]([O-])(=O)=O NINOVVRCHXVOKB-UHFFFAOYSA-N 0.000 description 2
- SFQOCJXNHZJOJN-UHFFFAOYSA-H dialuminum;dioxido-oxo-sulfanylidene-$l^{6}-sulfane Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=S.[O-]S([O-])(=O)=S.[O-]S([O-])(=O)=S SFQOCJXNHZJOJN-UHFFFAOYSA-H 0.000 description 2
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 2
- VFNGKCDDZUSWLR-UHFFFAOYSA-L disulfate(2-) Chemical compound [O-]S(=O)(=O)OS([O-])(=O)=O VFNGKCDDZUSWLR-UHFFFAOYSA-L 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003925 fat Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- ZMZDMBWJUHKJPS-UHFFFAOYSA-M isothiocyanate Chemical compound [S-]C#N ZMZDMBWJUHKJPS-UHFFFAOYSA-M 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 230000001264 neutralization Effects 0.000 description 2
- 235000006408 oxalic acid Nutrition 0.000 description 2
- 239000012188 paraffin wax Substances 0.000 description 2
- 230000000717 retained Effects 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- KEAYESYHFKHZAL-UHFFFAOYSA-N sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 150000004764 thiosulfuric acid derivatives Chemical class 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VIFYIFQGOLPNHA-UHFFFAOYSA-L zinc;dioxido-oxo-sulfanylidene-$l^{6}-sulfane Chemical compound [Zn+2].[O-]S([O-])(=O)=S VIFYIFQGOLPNHA-UHFFFAOYSA-L 0.000 description 2
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 tanning material chromium or other mineral substance
- fats or paraffin which made it less waterproof
- chromic acid salts they were reduced with green vitriol, oxalic acid, sulphurous acid, thio-sulphuric acid, sulphureted hydrogen, &c., a process which is only suitable for the manufacture of certain kinds of leather in which no value is placed upon a smooth out and goodweight.
- the reduction also of the chromic acid in acid solutions appears detrimental to the ultimate quality of the leather.
- tanning with chromic acid salts or chromic oxide salts does not appear to have been sufficiently observed so that the different chromium compounds behaved very differently to the fibers of the hide.
- the tanning process hereinafter described is to obviate the above mentioned difficulties.
- chromic chromate Or formed either by dissolving chromic hydrate (one molecule) in the equivalent quantity of chromic acid (three molecules) or by decomposing a salt of chromic oxide with compounds of chromic acid; bichromate monosulphate of chromium (Jr,,(OrO SO formed either by dissolving one molecule of chromic hydrate in two molecules of chromic acid and one molecule of sulphuric acid or by any other suitable methods; basic chromate sulphate of chromium Or CrO SO formed by dissolving one molecule of chromic hydrate in a solution of one molecule of chromic acid and one molecule of sulphuric acid; chromate disulphate of chromium Cr CrO (SO formed by dissolving one molecule of chromic oxide in two molecules of sulphuric acid and one molecule of chromic acid.
- bichromate monosulphate of chromium Jr,,(OrO SO formed either by dissolving one molecule
- hides to be tanned are prepared, cleaned and deprived of hair according to the usual methods.
- the hides thus prepared for tanning are first placed in a dilute solution of the above mentioned compounds of chromic acid and chromic oxide and then the solution is successively strengthened by putting in fresh quantities of the chromiumcompounds. It is preferable to begin with a one-fourth to one-half per cent. solution and gradually strengthen this to from ten to fifteen per cent. For heavy leather very concentrated solutions should be used at the finish.
- the length of time of the tanning depends upon the thickness and quality of the hides.
- Heavy leather hides are left five to eight Weeks in the tan liquor.
- aluminium chromate formed by dissolving an excess of aluminium hydrate in hot chromic acid
- chromic thiosulphate by decomposing salts of chromic oxide with salts of thiosulphuric acid
- chromic sulphite either by decomposing salts of chromic oxide with neutral or acid sulphite salts or by saturating a solution of sulphurous acid with chromic hydrate
- chromous chloride OrCl formed by reducing chromic chloride (M 01 with zinc or iron
- chromous sulphate OrSO formed by reducing chromic sulphate Or,,(SO with zinc dust or iron filings
- chromium'thiocyanate formed by decomposing barium thiocyanate with chromic sulphate
- the metallic salts of hydrosulphurous acid especially those of iron and zinc are much more efficacious than the alkaline salts of the latter.
- the metallic salts thereby deposit metallic oxide which not only tans but also gives color and they can be used as alkali salts without the addition of acid.
- the chromic and chromous oxide salts in use in my process reduce without any addition of acid the chromic acid and chromic acid compounds.
- the chromous oxide salts mostly combine with the fibers of the hide.
- the leather produced is thereby fuller and cuts smoother, the tanning is more complete and the weight better than in the old method of chromate tanning.
- alkaline and metallic salts of hydrosulphurous acid are used in solutions containing from one-fourth to three per cent. of the salts according to the weight and thickness of the hides.
- hide tanned with the above mentioned chromium compounds is treated with barium thiocyanate, when by decomposition there is formed chromium thiocyanate and the corresponding barium salt which for the most part is deposited on the fibers of the hide.
- the tanned hides for upper leather or other light leather should be made therefrom, and as soon as they come out of the tan liquor should be well washed, greased and dressed according to the known methods.
- the hides are dyed preferably before the greasing.
- Hides intended for sole leather do not require washing but may be taken out of the tan liquor, dried and dressed in the usual way.
- What I claim is 1. The process of tanning hides consisting in subjecting them to the action of a solution containing a compound of chromic acid and chromium.
Description
UNITED STATES PATENT OFFICE.
CHRISTIAN HEINZERLING, OF FRANKFORT-ON-THE-MAIN, GERMANY.
PROCESS OF TAWING HIDES.
SPECIFICATION forming part of Letters Patent No. 528,162, dated October 30, 1894.
Application filed July 27,1893- Serial No. 481.609. (No Specimens.)
T at whom/it may concern:
Be it known that I, CHRISTIAN HEINZER- LING, a subject of the Emperor of Germany, residing at 9 Rotteckstrasse, Frankfort-onthe-Main, in the Empire of Germany, have invented certain new and useful Improvements in Processes of Tawing QrTanning Hides, of which the following is a specification.
It has before been proposed to employ compounds of chromium or other mineral salts, but hitherto the employment of such substances has been accompanied by some disad vantages, namely: first, the leather is wanting in weight; second, the leatheris thin and unfilled; third, the leather cuts rough instead of smooth; fourth, generally the leather is not sufficiently capable of resisting the influence of water.
In order to avoid the effect of washing the leather containing the tanning material (chromium or other mineral substance) was impregnated with fats or paraffin which made it less waterproof, or, when the tanning was carried outwith chromic acid salts, they were reduced with green vitriol, oxalic acid, sulphurous acid, thio-sulphuric acid, sulphureted hydrogen, &c., a process which is only suitable for the manufacture of certain kinds of leather in which no value is placed upon a smooth out and goodweight. The reduction also of the chromic acid in acid solutions appears detrimental to the ultimate quality of the leather. Further, tanning with chromic acid salts or chromic oxide salts does not appear to have been sufficiently observed so that the different chromium compounds behaved very differently to the fibers of the hide. The tanning process hereinafter described is to obviate the above mentioned difficulties.
' In place of the compounds of chromium heretofore employed 1 use substances containing a compound of chromic acid and chromium, that is to say chromate of. chromium or chromate of chromium in which one 'or more atoms have been replaced by acid radicals. The following may be mentioned:
chromic chromate Or (CrO,,) formed either by dissolving chromic hydrate (one molecule) in the equivalent quantity of chromic acid (three molecules) or by decomposing a salt of chromic oxide with compounds of chromic acid; bichromate monosulphate of chromium (Jr,,(OrO SO formed either by dissolving one molecule of chromic hydrate in two molecules of chromic acid and one molecule of sulphuric acid or by any other suitable methods; basic chromate sulphate of chromium Or CrO SO formed by dissolving one molecule of chromic hydrate in a solution of one molecule of chromic acid and one molecule of sulphuric acid; chromate disulphate of chromium Cr CrO (SO formed by dissolving one molecule of chromic oxide in two molecules of sulphuric acid and one molecule of chromic acid.
In combinationwith the above named compoundsthere may be used the alkaline salts of chromic acid already employed and chromic acid.
In carrying out the process of tanning, the
hides to be tanned are prepared, cleaned and deprived of hair according to the usual methods. The hides thus prepared for tanning are first placed in a dilute solution of the above mentioned compounds of chromic acid and chromic oxide and then the solution is successively strengthened by putting in fresh quantities of the chromiumcompounds. It is preferable to begin with a one-fourth to one-half per cent. solution and gradually strengthen this to from ten to fifteen per cent. For heavy leather very concentrated solutions should be used at the finish.
The length of time of the tanning depends upon the thickness and quality of the hides.
Heavy leather hides are left five to eight Weeks in the tan liquor.
The above mentioned compounds may be used alone or the hides may subsequently be treated with one or other of the following compounds in order to give color and weight: aluminium chromate formed by dissolving an excess of aluminium hydrate in hot chromic acid; chromic thiosulphate by decomposing salts of chromic oxide with salts of thiosulphuric acid; chromic sulphite either by decomposing salts of chromic oxide with neutral or acid sulphite salts or by saturating a solution of sulphurous acid with chromic hydrate; chromous chloride OrCl formed by reducing chromic chloride (M 01 with zinc or iron; chromous sulphate OrSO, formed by reducing chromic sulphate Or,,(SO with zinc dust or iron filings; chromium'thiocyanate formed by decomposing barium thiocyanate with chromic sulphate; ferrous thiosulphate FeS O aluminium thiosulphate Al,(S O zinc thiosulphate ZnS O manganese thiosulphate MnS O all four formed by decomposing barium thiosulphate BaS O with salts of sulphuric acid or in other suitable manners; Schiitzenbergers hydrosulphites also called Bernthsens hyposulphites:ferr0us hydrosulphite FeS O zinc hydrosulphite ZnS O,, manganese hydrosulphite MnS O sodium hydrosulphite Na S,O formed by the action of the metal upon sulphurous acid or bisulphite of sodium. When finishing with these compounds I begin with a weak solution of one-fourth to one-half per cent, and subsequently strengthen the solution to fiveto seven per cent. according to the thickness and kind of leather.
In combination with the above named compounds there may be used the alkaline salts of chromic acid already employed or chromic acid itself.
Even the alkaline salts of hydrosulphurous acid efiect the reduction of the chromic acid and its compounds without addition of acid which is not the case with the alkaline thiosulphates.
The metallic salts of hydrosulphurous acid especially those of iron and zinc are much more efficacious than the alkaline salts of the latter. The metallic salts thereby deposit metallic oxide which not only tans but also gives color and they can be used as alkali salts without the addition of acid. The chromic and chromous oxide salts in use in my process reduce without any addition of acid the chromic acid and chromic acid compounds. The chromous oxide salts mostly combine with the fibers of the hide. The leather produced is thereby fuller and cuts smoother, the tanning is more complete and the weight better than in the old method of chromate tanning.
The above mentioned alkaline and metallic salts of hydrosulphurous acid are used in solutions containing from one-fourth to three per cent. of the salts according to the weight and thickness of the hides.
Compounds of chromic chromate, chromate sulphate of chromium, chromic thiosulphate, chromic sulphite are taken upso easily and in such great quantity by the fibers of the hide and are retained so well that they may for some kinds of leather be used alone for tanning.
If it he wished to obtain a very complete tanning of the leather and good weight the above named combinations are preferably used.
If it be wished to produce an especially hard and solid leather, hide tanned with the above mentioned chromium compounds is treated with barium thiocyanate, when by decomposition there is formed chromium thiocyanate and the corresponding barium salt which for the most part is deposited on the fibers of the hide. The tanned hides for upper leather or other light leather should be made therefrom, and as soon as they come out of the tan liquor should be well washed, greased and dressed according to the known methods.
If it he wished to produce colored or black leather, the hides are dyed preferably before the greasing.
Hides intended for sole leather do not require washing but may be taken out of the tan liquor, dried and dressed in the usual way.
What I claim is 1. The process of tanning hides consisting in subjecting them to the action of a solution containing a compound of chromic acid and chromium.
2. The process of tanning hides consisting in subjecting them successively to the action of solutions containing a compound of ohro mic acid and chromium and another compound of chromium, respectively.
3. The process of tanning hides consisting in subjecting them successively to the action of a solution containing a compound of chromic acid and chromium and then to a solution of a thiosulphate respectively.
CHRISTIAN HEINZERLING.
Witnesses:
JOHN H. WHITEHEAD, 24 Southampton Building, London, W O.
JOSEPH LAKE, 17 Gracechurch Street, London, E. C.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US528162A true US528162A (en) | 1894-10-30 |
Family
ID=2596950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US528162D Expired - Lifetime US528162A (en) | Christian heinzerling |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US528162A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2766098A (en) * | 1952-11-19 | 1956-10-09 | Diamond Alkali Co | Method of obtaining a chromiumcontaining tanning substance |
| US3888625A (en) * | 1973-01-29 | 1975-06-10 | Chemtan Company | Method of chrome-retanning leather |
| US7914763B1 (en) | 2010-02-15 | 2011-03-29 | Tessenderlo Kerley, Inc. | Process and apparatus for preparing manganese thiosulfate (MnTS) solution |
-
0
- US US528162D patent/US528162A/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2766098A (en) * | 1952-11-19 | 1956-10-09 | Diamond Alkali Co | Method of obtaining a chromiumcontaining tanning substance |
| US3888625A (en) * | 1973-01-29 | 1975-06-10 | Chemtan Company | Method of chrome-retanning leather |
| US7914763B1 (en) | 2010-02-15 | 2011-03-29 | Tessenderlo Kerley, Inc. | Process and apparatus for preparing manganese thiosulfate (MnTS) solution |
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