CH112326A - Process for the preparation of a tanning agent. - Google Patents
Process for the preparation of a tanning agent.Info
- Publication number
- CH112326A CH112326A CH112326DA CH112326A CH 112326 A CH112326 A CH 112326A CH 112326D A CH112326D A CH 112326DA CH 112326 A CH112326 A CH 112326A
- Authority
- CH
- Switzerland
- Prior art keywords
- preparation
- tanning agent
- tanning
- solution
- acid
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G16/00—Condensation polymers of aldehydes or ketones with monomers not provided for in the groups C08G4/00 - C08G14/00
- C08G16/02—Condensation polymers of aldehydes or ketones with monomers not provided for in the groups C08G4/00 - C08G14/00 of aldehydes
- C08G16/0212—Condensation polymers of aldehydes or ketones with monomers not provided for in the groups C08G4/00 - C08G14/00 of aldehydes with acyclic or carbocyclic organic compounds
- C08G16/0218—Condensation polymers of aldehydes or ketones with monomers not provided for in the groups C08G4/00 - C08G14/00 of aldehydes with acyclic or carbocyclic organic compounds containing atoms other than carbon and hydrogen
- C08G16/0237—Condensation polymers of aldehydes or ketones with monomers not provided for in the groups C08G4/00 - C08G14/00 of aldehydes with acyclic or carbocyclic organic compounds containing atoms other than carbon and hydrogen containing sulfur
-
- 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
- C14C3/18—Chemical tanning by organic agents using polycondensation products or precursors thereof
- C14C3/20—Chemical tanning by organic agents using polycondensation products or precursors thereof sulfonated
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Description
Verfahren zur Darstellung eines Gerbstoffes. Es wurde in weiterer Ausarbeitung des Verfahrens gemäss Hauptpatent gefunden, dass -ein Gerbstoff mit wertvollen Eigen schaften entsteht, wenn man Phenol mit Al .dol und Chlo-rnitrobenzolsulfosäure umsetzt. Man kondensiert zweckmässig das Phe nol mit Aldol und setzt das entstan dene Kondensationsprodukt .mit Chlornitro- benzolsulf osäure um. Es kann von Vor teil sein, die Umsetzung -unter Druck vor zunehmen.
Der Gerbstoff stellt eine homo gene, bräunlich gefärbte, sirupartige Lösung dar, ist leicht löslich in Wasser und Alka- lien, fällt Gelatine aus ihrer Lösung und gibt charakteristische Färbungen mit Eisen salzen.
<I>Beispiel:</I> 65 Teile Phenol werden mit 40 Teilen Aldol in Gegenwart eines Katalysators, z. B. 5 Teilen konzentrierte Salzsäure, in bekann ter Weise zu einem harzartigen Körper kon densiert. Dieser wird in 90 Teilen Wasser und 60 Teilen Natronlauge (40' B6) warm gelöst. In die Lösung bringt man unter gu- tem Rühren 120 Teile chlornitrobenzolsulfo- saures Natrium ein und erwärmt, nachdem alles gelöst ist, die Masse langsam bis zum schwachen Sieden. Die Siedetemperatur wird so lange eingehalten, bis eine Probe nach Verdünnen mit Wasser auf Zusatz von Säure keinen Niederschlag mehr ausscheidet.
Die erhaltene wässerige Lösung kann zur Trockne eingedampft oder auch als solche nach erforderlicher Verdünnung und Einstel lung auf die erwünschte Acidität zum Ger ben verwendet werden. Man erzielt eine rasche Durehgerbung. Die erhaltenen Leder zeichnen sich durch helle Farbe, vollen Griff und hohe Reissfestigkeit aus. Die Gerbung kann natürlich auch ausgeführt werden in Gegenwart anderer vegetabilischer oder künstlicher Gerbstoffe.
Process for the preparation of a tanning agent. In a further elaboration of the process according to the main patent, it was found that a tannin with valuable properties is produced when phenol is reacted with Al .dol and chloro-nitrobenzenesulfonic acid. The phenol is conveniently condensed with aldol and the condensation product formed is reacted with chloronitrobenzenesulfonic acid. It can be advantageous to carry out the implementation under pressure.
The tanning agent is a homogeneous, brownish, syrupy solution, is easily soluble in water and alkali, gelatine falls out of its solution and gives characteristic colors with iron salts.
<I> Example: </I> 65 parts of phenol are mixed with 40 parts of aldol in the presence of a catalyst, e.g. B. 5 parts of concentrated hydrochloric acid, condensed in a well-known manner to form a resinous body. This is dissolved warm in 90 parts of water and 60 parts of sodium hydroxide solution (40 'B6). 120 parts of chloronitrobenzenesulphonic acid sodium are introduced into the solution with vigorous stirring and, once everything has dissolved, the mass is slowly heated to a gentle boil. The boiling temperature is maintained until a sample no longer separates out after dilution with water with the addition of acid.
The resulting aqueous solution can be evaporated to dryness or used as such for tanning after the necessary dilution and adjustment to the desired acidity. Quick tanning is achieved. The leathers obtained are distinguished by their light color, full handle and high tensile strength. The tanning can of course also be carried out in the presence of other vegetable or artificial tanning agents.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE107632X | 1923-02-07 | ||
CH112326T | 1924-09-15 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH112326A true CH112326A (en) | 1925-10-16 |
Family
ID=25708014
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH112326D CH112326A (en) | 1923-02-07 | 1924-09-15 | Process for the preparation of a tanning agent. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH112326A (en) |
-
1924
- 1924-09-15 CH CH112326D patent/CH112326A/en unknown
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