US613898A - Process of tawing hides or skins - Google Patents
Process of tawing hides or skins Download PDFInfo
- Publication number
- US613898A US613898A US613898DA US613898A US 613898 A US613898 A US 613898A US 613898D A US613898D A US 613898DA US 613898 A US613898 A US 613898A
- Authority
- US
- United States
- Prior art keywords
- skins
- acid
- hides
- chromic
- tawing
- 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
- 210000003491 Skin Anatomy 0.000 title description 32
- 238000000034 method Methods 0.000 title description 8
- KRVSOGSZCMJSLX-UHFFFAOYSA-L Chromic acid Chemical compound O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 38
- 239000002253 acid Substances 0.000 description 16
- BVKZGUZCCUSVTD-UHFFFAOYSA-N Carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 10
- IOVCWXUNBOPUCH-UHFFFAOYSA-M nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 10
- 239000010985 leather Substances 0.000 description 8
- -1 nitrous-acid compound Chemical class 0.000 description 8
- IOVCWXUNBOPUCH-UHFFFAOYSA-N nitrous acid Chemical class ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 4
- 235000011149 sulphuric acid Nutrition 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate dianion Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 241001600451 Chromis Species 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N Potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- GQPLMRYTRLFLPF-UHFFFAOYSA-N nitrous oxide Inorganic materials [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000004328 sodium tetraborate Substances 0.000 description 2
- 235000010339 sodium tetraborate Nutrition 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 invention is designed more particularly for reducing the chromic acid in hides and skins which have been tanned with such chromic acid or chromic-acid salts by the action of a nitrous-acid compound, such as nitrite of soda,inthe presence of an acid,whereby after subsequent usual treatment leather is produced which is durable, strong, and waterproof.
- a nitrous-acid compound such as nitrite of soda
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)
Description
UNI-TED STATES PATENT OFFICE,
IIERMANN DANNENBAUM, OF PHILADELPHIA, PENNSYLVANIA.
PROCESS OF TAWING HIDES OR SKINS, 80C.
SPECIFICATION forming part of Letters Patent No. 613,898, dated November 8, 1898.
Application filed January 29; 1898. fierial Noi 668,478. (No specimens.)
To aZZ whom it may concern:
Be it known that I, HERMANN DANNENBAUM, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsylvania, have invented a new and useful Improvement in Processes of Tawing Hides or Skins,which improvement is fully set forth in the following specification and accompanying drawings. p
The invention is designed more particularly for reducing the chromic acid in hides and skins which have been tanned with such chromic acid or chromic-acid salts by the action of a nitrous-acid compound, such as nitrite of soda,inthe presence of an acid,whereby after subsequent usual treatment leather is produced which is durable, strong, and waterproof.
While hides and skins may be converted into leather by the action of chromic acid or chromic-acid salts alone, leather made in this Way is not waterproof and only will become so when the chromic acid is reduced in the skin into chromic oxid.
In treating hides or skins which have been tanned with chromic acid or chromic-acid salts with a solution of a nitrous-acid salt in the presence of an acid the chromic acid is reduced to chromic oxid, which unites with the fiber of the skins, producing leather that out and drained, and after the surplus solu= tion is pressed out they are transferred to the second bath, which is prepared by dissolving about four per cent. of the Weight of the skins of nitrite of soda in water. After the skins are in this bath I add to it a quantity, sufficient to decompose the entire amount of nitrite of soda, of oil of vitriol, or any other acid, suitably diluted. This requires from one-half to one pound of oil of vitriol to one pound of nitrite. The nitrous anhydrid and other products of decomposition which are thus formed act immediatelyupon the chromic acid and reduce the same to chromic oxid. In order to obtain an equal reduction, it is desirable to agitate the hides or skins in the solution, and they remain therein until the chromic acid has been sufficiently reduced. The hides or skins are then removed from the solution and drained, after which in order to remove any free acid in the hides and skins they are washed in a weak alkaline solution, for which I prefer to use carbonate of soda or borax or both. The surplus water is then pressed from the skins, and the latter are finished in the usual manner.
Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is
The process of tawing hides or skins,which consists in subjecting the previously-prepared hides or. skins to the action of asolution of a chromi'c-acid salt, such as bichromate of potash, in the presence of an acid, such as mu.- riatic acid, and then subjecting said hides or skins to the action of a'solution of a nitrousacid salt, such as nitrite of soda, in the presence of an acid, substantially as described.
HERMANN DANNENBAUM.
Witnesses:
JOHN A. WIEDERsHEIM, WM. 0. WIEDERSHEIM.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US613898A true US613898A (en) | 1898-11-08 |
Family
ID=2682509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US613898D Expired - Lifetime US613898A (en) | Process of tawing hides or skins |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US613898A (en) |
-
0
- US US613898D patent/US613898A/en not_active Expired - Lifetime
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