US1404957A - Process of chrome tanning - Google Patents
Process of chrome tanning Download PDFInfo
- Publication number
- US1404957A US1404957A US822696A US1914822696A US1404957A US 1404957 A US1404957 A US 1404957A US 822696 A US822696 A US 822696A US 1914822696 A US1914822696 A US 1914822696A US 1404957 A US1404957 A US 1404957A
- Authority
- US
- United States
- Prior art keywords
- aluminum
- tanning
- soda
- chromic
- chrome tanning
- 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
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 object of the present invention is a process of tanning and particularly an improvement in the usual chrome tanning process, and consists in reducing the chromic acid and neutral chromic salts by a solution of bisulphite of aluminum without any further addition of an acid.
- the composition of the deposit of chromium and aluminum oxides can be correspondingly varied.
- a process of chromic tanning consisting in subjecting the hides to a treatment with chromic acid and reducing the latter by stoichiometric mixture of bisulphite of soda, and a neutral salt of aluminum.
- a process of chromic tanning consisting in subjecting the hides to a treatment with chromic acid and reducing the latter by stoichiometric mixture of bisulfite and sulfite of soda and a neutral salt of aluminum.
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- 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
UNITED STATES FRIEDRICH HIRSCH, 0F VIENNA, AUSTRIA.
PROCESS OF CHROME TANNING.
Specification of Letters Patent.
" Patented J an. 31, 1922.
No Drawing. Application filed March 5, 1914, Serial No. 822,696. Renewed January 29, 1918. Serial No. 214,415.
(GRANTED UNDER THE PROVISIONS OF THE ACT OF MARCH 3, 1921, 41 STAT. In, 1313.)
To all whom it may concern Be it known that I, FRIEDRICH Hmsorr, a subject of the Emperor of Austria, and a resident of 33 Praterstrasse, Vienna, Austria, have invented new and useful Improvements in Processes of Chrome Tanning, (for which I have filed applications in Austria, Mar. 8, 1913; in Germany, Mar. 9, 1913, Patent No. 271,585; in Hungary, Dec. 5, 1913; in France, Dec. 6, 1913, Patent No. 465,846; and in Russia, Nov. 28, 1913,) of which the following is a specification.
The object of the present invention is a process of tanning and particularly an improvement in the usual chrome tanning process, and consists in reducing the chromic acid and neutral chromic salts by a solution of bisulphite of aluminum without any further addition of an acid.
Processes are known according to which aluminum compounds are used with chromic acid or chromates.
The use of aluminum salts which have a reducing action, is mentioned for the first time in the Patent No. 528,162 which mentions thio-sulfate aluminum as a tanning substance.
The known processes generally employed thio-sulphate of soda or bi-sulfite of soda (NaHSO as a reducing agent with the' addition of an acid:
If sodium thiosulphate (Na s O is used,
velopment of heat is avoided and that the reduction of the chromic acid takes place gradually when aluminum and the like is used without the addition of an acid, while at the same time there is formed a deposit of hydrate of aluminum (Al(OH) in the hide. That is, all the advantages of tanning with basic salts, as for instance the insoluble condition of the tanning material after the conclusion of the process are derived therefrom. The bisulphites of aluminum can also be replaced by a stoechiometric mixture of bisulphite of soda and a neutral or even a basic aluminum salt.
if, instead of the bi-sulfite of soda a mixture of monoand bisodium hyposulphite is used, the composition of the deposit of chromium and aluminum oxides can be correspondingly varied.
Instead of aluminum bisulphite zinc bisulphite may be used when desired, and the retarding reaction which these two compounds can eii ect in the reduction of the chromic acid or its salts can be governed at will by the addition either of acid or of bisulphites of the alkaline earths.
What I claim is:
1. A process of chromic tanning consisting in subjecting the hides to a treatment with chromic acid and reducing the latter by stoichiometric mixture of bisulphite of soda, and a neutral salt of aluminum.
2. A process of chromic tanning consisting? in subjecting the hides to a treatment with chromic acid and reducing the latter by stoichiometric mixture of bisulfite of soda and a basic salt of aluminum.
3. A process of chromic tanning consisting in subjecting the hides to a treatment with chromic acid and reducing the latter by stoichiometric mixture of bisulfite and sulfite of soda and a neutral salt of aluminum.
In testimony whereof I aflix my signature in presence of two witnesses.
FRIEDRICH HIRSCH.
Witnesses IGNAZ KNIORFELNAOHL, RUDOLF Rrrrnn.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US822696A US1404957A (en) | 1914-03-05 | 1914-03-05 | Process of chrome tanning |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US822696A US1404957A (en) | 1914-03-05 | 1914-03-05 | Process of chrome tanning |
Publications (1)
Publication Number | Publication Date |
---|---|
US1404957A true US1404957A (en) | 1922-01-31 |
Family
ID=25236717
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US822696A Expired - Lifetime US1404957A (en) | 1914-03-05 | 1914-03-05 | Process of chrome tanning |
Country Status (1)
Country | Link |
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US (1) | US1404957A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2929732A (en) * | 1950-04-10 | 1960-03-22 | Universal Match Corp | Method of hardening shellac and gum arabic |
-
1914
- 1914-03-05 US US822696A patent/US1404957A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2929732A (en) * | 1950-04-10 | 1960-03-22 | Universal Match Corp | Method of hardening shellac and gum arabic |
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