DE438199C - Process for the preparation of tanning agents - Google Patents
Process for the preparation of tanning agentsInfo
- Publication number
- DE438199C DE438199C DEB114970D DEB0114970D DE438199C DE 438199 C DE438199 C DE 438199C DE B114970 D DEB114970 D DE B114970D DE B0114970 D DEB0114970 D DE B0114970D DE 438199 C DE438199 C DE 438199C
- Authority
- DE
- Germany
- Prior art keywords
- charcoal
- tanning agents
- preparation
- nitric acid
- percent
- 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
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
- C14C3/08—Chemical tanning by organic agents
- C14C3/10—Vegetable tanning
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
Verfahren zur Darstellung von Gerbmitteln. Es ist bekannt, daß durch Einwirkung von Salpetersäure oder Stickoxyden auf Holzkohle synthetische Gerbstoffe entstehen.Process for the preparation of tanning agents. It is known that by Effects of nitric acid or nitrogen oxides on charcoal synthetic tanning agents develop.
Es wurde nun gefunden, daß man zu besonders wertvollen Gerbstoffen dieser Art gelangt, wenn man Holzkohlen benutzt, die einen erheblichen Gehalt an gebundenem Sauerstoff aufweisen, zweckmäßig solche, deren Sauerstotigehalt, bezogen auf aschefreie, trockene Holzkohle, bei 9 Prozent und darüber liegt. Holzkohlensorten dieser Art geben besonders leicht und unter verhältnismäßig geringem Salpetersäure- oder Stickoxydverbrauch Gerbstoffe, die sich durch besonders helle Farbe auszeichnen.It has now been found that particularly valuable tanning agents can be obtained of this kind, if one uses charcoal, which contains a considerable amount of Have bound oxygen, appropriately those whose oxygen content, based on ashless, dry charcoal, is 9 percent and above. Types of charcoal of this type give particularly easily and with relatively little nitric acid or nitrogen oxide consumption Tannins, which are characterized by their particularly light color.
Beispiel i.Example i.
ioo Gewichtsteile fein pulverisierte Holzkohle, deren Sauerstoffgehalt, bezogen auf aschefreie, trockene Kohle. 14, 8 Prozent beträgt, werden mit i 6o Gewichtsteilen Wasser angerührt. Man fügt allmählich i 2o Gewichtsteile 95prozentige Salpetersäure hinzu und erhitzt langsam zum Sieden. Nach i 2stündigem Sieden destilliert man den größten Teil der Flüssigkeit ab, worauf man 86o Gewichtsteile 95prozentige Salpetersäure langsam zufließen läßt. Man erhitzt z Tage zu schwachem Sieden und destilliert alsdann den größten Teil der noch vorhandenen wäßrigen Salpetersäure zum Schluß zweckmäßig in schwachem Vakuum ab. Zur Entfernung der letzten Reste Salpetersäure dampft man-inehrinals mit Was.-ser zur Trockne und pulverisiert den Rücktand. Man erhält ein orange- bis gelbgefärbtes Pulver, das in Wasser vollkommen löslich ist und vorzügliche gerberische Eigenschaften besitzt.100 parts by weight of finely powdered charcoal, the oxygen content of which based on ashless, dry coal. 14.8 percent is added with i 6o parts by weight Touched water. Gradually i 20 parts by weight of 95 percent nitric acid are added added and heated slowly to the boil. After boiling for 2 hours, the is distilled Most of the liquid is removed, whereupon 86o parts by weight of 95 percent nitric acid are added slowly flowing in. The mixture is heated to a gentle boil for two days and then distilled Most of the aqueous nitric acid still present is expedient at the end in a weak vacuum. To remove the last remains of nitric acid, steam inehrinals with water to dryness and pulverize the residue. You get an orange bis Yellow colored powder that is completely soluble in water and excellent tannery Possesses properties.
Beispiel e.Example e.
iooTeile fein pulverisierte Holzkohle, dereil Sauerstoffgehalt, bezogen auf as,chefreie, trokkene Kohle, 13,7 Prozent beträgt, werden mit zoo Teilen Wasser angerührt. Man leitet mit Luft vermischte Stickoxyde bei einer Temperatur von 7o bis 9o° so lange ein, bis die Holzkohle zum größten Teil gelöst ist, was mehrere Tage dauert. Alsdann destilliert man innerhalb 3o Stunden die verdünnte Salpetersäure ab unter Vermeidung von Überhitzung. Der Rückstand wird getrocknet und gepulvert; er ist nunmehr klar in Wasser löslich und kann entweder unmittelbar oder nach vorherigem Anneutralisieren zum Gerben verwendet werden.100 parts of finely powdered charcoal, containing the oxygen content As, head-free, dry coal, 13.7 percent, be with zoo parts of water touched. Nitrogen oxides mixed with air are passed in at a temperature of 70 up to 90 ° until the charcoal is largely dissolved, which is several Takes days. The dilute nitric acid is then distilled within 30 hours starting while avoiding overheating. The residue is dried and powdered; he is now clearly soluble in water and can either immediately or after Neutralizing can be used for tanning.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB114970D DE438199C (en) | 1924-07-24 | 1924-07-24 | Process for the preparation of tanning agents |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB114970D DE438199C (en) | 1924-07-24 | 1924-07-24 | Process for the preparation of tanning agents |
Publications (1)
Publication Number | Publication Date |
---|---|
DE438199C true DE438199C (en) | 1926-12-10 |
Family
ID=6993896
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB114970D Expired DE438199C (en) | 1924-07-24 | 1924-07-24 | Process for the preparation of tanning agents |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE438199C (en) |
-
1924
- 1924-07-24 DE DEB114970D patent/DE438199C/en not_active Expired
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