DE265915C - - Google Patents
Info
- Publication number
- DE265915C DE265915C DENDAT265915D DE265915DA DE265915C DE 265915 C DE265915 C DE 265915C DE NDAT265915 D DENDAT265915 D DE NDAT265915D DE 265915D A DE265915D A DE 265915DA DE 265915 C DE265915 C DE 265915C
- Authority
- DE
- Germany
- Prior art keywords
- formaldehyde
- condensation products
- alkali
- sulfuric acid
- 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.)
- Active
Links
- 239000000126 substance Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 11
- 239000007859 condensation product Substances 0.000 description 6
- 150000002989 phenols Chemical class 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Natural products OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- DXRFSTNITSDOKK-UHFFFAOYSA-N formaldehyde;sulfurous acid Chemical compound O=C.OS(O)=O DXRFSTNITSDOKK-UHFFFAOYSA-N 0.000 description 2
- 210000003491 Skin Anatomy 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L Sulphite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-M bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000010985 leather Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001264 neutralization Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N sulfonic acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
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
- C14C3/18—Chemical tanning by organic agents using polycondensation products or precursors thereof
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
Patentiert im Deutschen Reiche vom 29. Januar 1913 ab.Patented in the German Empire on January 29, 1913.
Es ist bereits ein Verfahren bekannt, nach welchem man gerbende Stoffe in der Weise erhält, daß man Phenole oder Phenolsulfosäuren oder deren Gemische mit Formaldehyd 5 oder dessen Äquivalenten und Schwefelsäure bzw. substituierten Schwefelsäuren derart zur Reaktion bringt, daß ganz oder hauptsächlich wasserlösliche Produkte entstehen.A method is already known, according to which one tanning substances in the way obtained by phenols or phenolsulfonic acids or mixtures thereof with formaldehyde 5 or its equivalents and sulfuric acid or substituted sulfuric acids in such a way for Reaction brings about that wholly or mainly water-soluble products are formed.
Dieses Verfahren hat den Nachteil, daßThis method has the disadvantage that
ίο man stets mit einem Überschuß von Schwefelsaure arbeiten muß, welche aus dem Reaktionsprodukt nachträglich wieder zu entfernen ist, weil die freie Säure natürlich die zu gerbende Haut zerstören würde. Fällt man die Schwefelsäure in Form eines unlöslichen Salzes aus, so muß man dazu weitgehend verdünnen und dann nachträglich wieder konzentrieren, um das Produkt in handelsfähigc Form zu bringen, was teuer ist und wobei der Gerbstoff sich ohne Anwendung besonderer Vorsichtsmaßregeln .dunkler färbt. Neutralisiert man dagegen die Schwefelsäure mit Basen, welche lösliche Salze bilden, so stören diese in reichlichen Mengen vorhandenen Salze für manche Zwecke die Gerbung.ίο you always use an excess of sulfuric acid must work, which has to be subsequently removed from the reaction product, because the free acid is of course the one to be tanned Would destroy skin. If the sulfuric acid is precipitated in the form of an insoluble salt off, you have to largely dilute and then concentrate again afterwards, to bring the product into marketable form, which is expensive and where the tanning agent turns darker in color without taking special precautions. Neutralized if, on the other hand, the sulfuric acid is mixed with bases which form soluble salts, then these are disturbed Salts, which are present in abundant quantities, are used for some purposes.
Es wurde nun gefunden, daß sich die Anwendung von Schwefelsäure vermeiden läßt, wenn man die Alkali löslichen Kondensationsprodukte aus Phenolen und deren Derivaten It has now been found that the use of sulfuric acid can be avoided, when you consider the alkali-soluble condensation products of phenols and their derivatives
mit Formaldehyd bzw. dessen Äquivalenten dadurch in wasserlösliche Form überführt, daß man dieselben nach dem an sich bekannten Verfahren der Patentschrift 87335 mit konzentrierten Lösungen von Formaldehyd und neutralem Sulfit erhitzt, oder indem man diese Kondensationsprodukte in Alkali löst und mit Formaldehydbisulfit zur Reaktion bringt.converted into water-soluble form with formaldehyde or its equivalents, that the same by the method known per se of the patent 87335 with concentrated solutions of formaldehyde and neutral sulfite heated, or by being dissolves these condensation products in alkali and reacts with formaldehyde bisulfite brings.
Ks war nicht ohne weiteres vorauszusehen, daß bei den erwähnten Kondensationsprodnkten die Reaktion in der gewünschten Weise verlaufen werde, da es bekannt ist, daß derartige Phenolderivate mit weiterem Form-· aldehyd, insbesondere in Gegenwart alkalisch reagierender Substanzen, leicht unter Bildung alkaliunlöslicher Kondensationsprodukte weiter reagieren, worauf bekanntlich der sogenannte Bakclitprozeß beruht. Die Methode führt jedoch glatt zum Ziel und hat den Vorteil, daß man sofort hochkonzentrierte Lösungen erhält, welche man entweder ohne weiteres oder nach Ncutralisicrung des vorhandenen Alkalis beliebig weiter konzentrieren kann. Durch die Verwendung des SuIfits, aus welchem beim Ansäuern die reduzierende schweflige Säure frei wird, gelingt es auch leicht, das Produkt während der Konzentration vor Oxydation durch die Luft zu schützen. Man erhält daher sofort ein sehr hellfarbiges Gerbmaterial, welches bei der Gerbung ein weißes Leder liefert.It was not easy to foresee that in the case of the condensation products mentioned the reaction will proceed in the desired manner, since it is known that such Phenol derivatives with further formaldehyde, especially alkaline in the presence reacting substances, easily with the formation of alkali-insoluble condensation products react on what is known to be the basis of the so-called bakclit process. The method leads however smoothly to the goal and has the advantage that one immediately gets highly concentrated solutions obtained, which one either without further ado or after Ncutralisicrung the existing Alkalis can concentrate any further. By using the suit from which the reducing sulphurous acid is released during acidification, it is also easy to Protect the product from air oxidation during concentration. Man therefore immediately receives a very light-colored tanning material, which becomes white during tanning Leather supplies.
Pa τ ε ν τ - A ν s ρ it υ c η :Pa τ ε ν τ - A ν s ρ it υ c η:
Verfahren zur Herstellung gerbender Stoffe, dadurch gekennzeichnet, daß man alkalilösliche Kondensationsprodukte aus Phenolen oder deren Substitutionsprodukten mit Formaldehyd bzw. dessen Äquivalenten in Gegenwart von nexitralen Sulfiten mit Formaldehyd behandelt oder die Lösung obiger Kondensationsprodukte in Alkali mit Formaldehydbisulfit in Reaktion bringt.Process for the production of tanning substances, characterized in that one alkali-soluble condensation products from phenols or their substitution products with formaldehyde or its equivalents in the presence of nexitralen sulfites with Treated formaldehyde or the solution of the above condensation products in alkali with Brings formaldehyde bisulfite in reaction.
fj. Auflage, aus£i'%eh&i omfj. Edition, from £ i '% eh & i om
nt:»tlN. CEDUITCKT IN l>£llnt: »tlN. CEDUITCKT IN l> £ ll
Claims (1)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE265915C true DE265915C (en) |
Family
ID=523104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT265915D Active DE265915C (en) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE265915C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE749553C (en) * | 1937-05-22 | 1944-11-24 | Process for the production of cation-exchanging synthetic resins | |
| DE755119C (en) * | 1936-07-14 | 1953-02-16 | Ig Farbenindustrie Ag | Process for increasing the cation exchange capacity of phenol-aldehyde resins |
-
0
- DE DENDAT265915D patent/DE265915C/de active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE755119C (en) * | 1936-07-14 | 1953-02-16 | Ig Farbenindustrie Ag | Process for increasing the cation exchange capacity of phenol-aldehyde resins |
| DE749553C (en) * | 1937-05-22 | 1944-11-24 | Process for the production of cation-exchanging synthetic resins |
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