US498077A - Process of tawing hides or skins - Google Patents
Process of tawing hides or skins Download PDFInfo
- Publication number
- US498077A US498077A US498077DA US498077A US 498077 A US498077 A US 498077A US 498077D A US498077D A US 498077DA US 498077 A US498077 A US 498077A
- Authority
- US
- United States
- Prior art keywords
- skins
- hides
- tawing
- bath
- acid
- 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 26
- 238000000034 method Methods 0.000 title description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N HCl Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 24
- 229960000443 hydrochloric acid Drugs 0.000 description 12
- 235000011167 hydrochloric acid Nutrition 0.000 description 12
- 239000002253 acid Substances 0.000 description 10
- UCKMPCXJQFINFW-UHFFFAOYSA-N sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 10
- KMUONIBRACKNSN-UHFFFAOYSA-N Potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 8
- 150000003839 salts Chemical class 0.000 description 8
- 239000011780 sodium chloride Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- -1 bichromate of potash Chemical class 0.000 description 4
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 4
- 229910052700 potassium Inorganic materials 0.000 description 4
- 239000011591 potassium Substances 0.000 description 4
- 150000001845 chromium compounds Chemical class 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 230000001603 reducing Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- KEAYESYHFKHZAL-UHFFFAOYSA-N sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000010186 staining Methods 0.000 description 2
- 238000005406 washing Methods 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
- This invention relates to an improved pro cess of tanning or tawing hides or skins, and consists in first subjecting them to a bath prepared by dissolving in water a metallic salt, such as bichromate of potash, and adding an acid such as hydrochloric acid, and then treating the same to a bath prepared by dissolving in water a soluble sulphide, such as the sulphide of potassium or of sodium, and adding an acid such as hydrochloric acid.
- a metallic salt such as bichromate of potash
- an acid such as hydrochloric acid
- the skins are allowed to remain in the above described bath until they have thoroughly absorbed the chromium compound, when they are removed, the surplus liquor is pressed out, and the skins thrown into a second bath.
- This second bath is prepared by I ash and the hydrochloric acid has. reached the desired point in its effect upon the skins. This is clearly indicated by achange of color in the skins from a yellowish red to a bluish green.
- the skins are now removed from this bath and may be subjected to theusual processes of staining, fat-liquoring, coloring and finishing, as now employed on chrome-tanned stock.
- a metallic salt such as bichromate of potash
- an acid such as hydro-chloric acid
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Coloring (AREA)
Description
UNITED STATES PATENT OFFICE.
WILLIAM M. NORRIS, OF PRINCETON, NEW JERSEY, ASSIGNOR OF ONE-HALF TO HENRY BURK, OF PHILADELPHIA, PENNSYLVANIA.
PROCESS OF TAWING HIDES OR SKINS.
SPECIFICATION forming part of Letters Patent No. 498,077, dated May 23, 1893. Application filed February 3, 1393. Serial No. 460,862. (No specimens.)
To all whom it may concern:
Be it known that I, WILLIAM M. NORRIS, a citizen of the United States, and a resident of Princeton, Mercer county, New Jersey, have invented an Improved Process of Tawing or Tanning Hides or Skins, of which the following is a specification.
This invention relates to an improved pro cess of tanning or tawing hides or skins, and consists in first subjecting them to a bath prepared by dissolving in water a metallic salt, such as bichromate of potash, and adding an acid such as hydrochloric acid, and then treating the same to a bath prepared by dissolving in water a soluble sulphide, such as the sulphide of potassium or of sodium, and adding an acid such as hydrochloric acid.
In carrying out my process I prepare hides or skins for tawing or tanning by subjecting them to the usual processes of soaking, 1im ing, unhairing, bating, washing, &c. I then place them in a bath prepared by dissolving in water an amount of a metallic salt, such as bichromate of potash, equal to about five per cent. of the weight of the hides or skins to be treated therewith, and adding about one half the quantity of a suitable acid, preferably hydrochloric acid.
The skins are allowed to remain in the above described bath until they have thoroughly absorbed the chromium compound, when they are removed, the surplus liquor is pressed out, and the skins thrown into a second bath. This second bath is prepared by I ash and the hydrochloric acid has. reached the desired point in its effect upon the skins. This is clearly indicated by achange of color in the skins from a yellowish red to a bluish green. The skins are now removed from this bath and may be subjected to theusual processes of staining, fat-liquoring, coloring and finishing, as now employed on chrome-tanned stock.
I do not limit myself to the described proportions of ingredients.
I do not claim broadly the tawing of skins by first subjecting them to the action of a bath prepared from a metallic salt (such as bichromate of potash) and then to the reducing action of hydrogen sulphide, as that forms the subject of an application filed by me July 14, 1891, Serial No. 399,448; nor do I claim subjecting the hides or skins to the combined action of a soluble sulphide, a metallic salt (such as bichromate of potash) and an acid (such as hydro-chloric acid) in the presence of each other, as that forms the subject of an application filed by Arthur D. Little, June treating the hides or skins to a bath of a so- I lution of a soluble sulphide, such as sulphide of potassium, with an acid, such as hydrochloric acid, substantially as described.
In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.
WILLIAM M. NORRIS.
- Witnesses:
JOSEPH H. KLEIN, HUBERT HOWSON.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US498077A true US498077A (en) | 1893-05-23 |
Family
ID=2566913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US498077D Expired - Lifetime US498077A (en) | Process of tawing hides or skins |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US498077A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060086885A1 (en) * | 2004-10-27 | 2006-04-27 | Efficient Mining Systems Llc. | Load-bearing pressurized liquid column |
-
0
- US US498077D patent/US498077A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060086885A1 (en) * | 2004-10-27 | 2006-04-27 | Efficient Mining Systems Llc. | Load-bearing pressurized liquid column |
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