DE858562C - Process for the production of synthetic tanning agents - Google Patents

Process for the production of synthetic tanning agents

Info

Publication number
DE858562C
DE858562C DEF3971D DEF0003971D DE858562C DE 858562 C DE858562 C DE 858562C DE F3971 D DEF3971 D DE F3971D DE F0003971 D DEF0003971 D DE F0003971D DE 858562 C DE858562 C DE 858562C
Authority
DE
Germany
Prior art keywords
condensation
production
tanning agents
synthetic tanning
weight
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
Application number
DEF3971D
Other languages
German (de)
Inventor
Ernst Dr Koch
Walter Dr Pense
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hoechst AG
Original Assignee
Hoechst AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hoechst AG filed Critical Hoechst AG
Priority to DEF3971D priority Critical patent/DE858562C/en
Application granted granted Critical
Publication of DE858562C publication Critical patent/DE858562C/en
Expired legal-status Critical Current

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
    • C14C3/18—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)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)

Description

Verfahren zur Herstellung synthetischer Gerbstoffe Es ist bekannt, daß man durch Sulfonierung von mehrkernigen aromatischen Kohlenwas.serstoffen und Kondensation der erhaltenen. Sulfonsäuren mit Formald--hvd Gerbstoffe herstellen kann. Die so erhaltenen y Produkte besitzen aber nur ein verhältnismäßig geringes Füllvermögen. Sulfoniert man mit -einem v°rhältrnismäßig großen Überschuß an Scliw"felsäure, so kann man nach der Formald-°hvdkond.ensätion di,e Füllkraft des Gerbstoffs durch Kondensation mit aromatischen Oxvalkoholen steigern. Noch besser füllende Gerbstoffe erhält man, wenn man außerdem noch teilweise sulfonierte Pl-,:nolald-ehvdkondensation-sproduktezusetzt. Die üb-erschüssige. Schwefelsäure wird hei diesen Produkten durch Neutralisation: unschädlich gemacht. Man erhält also Gerbstoffe mit v erhältnismäßig hohem N'ichtgerbstoffgehalt.Process for the production of synthetic tanning agents It is known that by sulfonating polynuclear aromatic hydrocarbons and Condensation of the obtained. Manufacture of sulphonic acids with formaldehyde - hvd tannins can. The y products obtained in this way, however, only have a relatively small amount Filling capacity. If one sulphonated with a v ° rhatally large excess of sulphonic acid, Thus, according to the formaldehyde condensation, the filling power of the tannin can be determined Increase condensation with aromatic oxy alcohols. Even better filling tannins is obtained if also partially sulfonated Pl - ,: nolald-ehvdkondensation-sproduktezusetzt. The excess. In these products, sulfuric acid is neutralized: rendered harmless. So tanning agents with a relatively high non-tanning agent content are obtained.

Will man nun Gerbstoffe mit geringerem. Nichtgerhsxoffgehalt herstellen und sulfoniert deshalb mit weniger Säure, so muß man die Sulfonsäure mit mehr Formaldehyd kondensieren, um zu gut wasserlöslichen Produkten zu gelangen. Diese Kondensation dauert aber verhältnismäßig lange Zeit, und man erhält Gerbstoffe, derer, Füllvermögen noch nicht groß ist.If you want tannins with less. Produce non-toxic content and therefore sulphonated with less acid, one must sulphonic acid with more formaldehyde condense to produce readily water-soluble products. This condensation but takes a relatively long time, and you get tannins, their filling capacity is not big yet.

Es wurde nun. gefunden, d)aß man Gerbstoffe m;it gutem Füllvermögen und günstigem Gerbstoff-Nichtgerhstoff-Ver'hältnis erhält, wenn man bereits während der Fo.rmaldehydkondensation der Sulfon, Säuren mehrkerniger aromäti,sch-er Kohlenwasserstoffe teilweise 'sulfonierte Phenolformaldehydkondensationsprodukte zusetzt und mitkondensiert. Als technischer Vorteil ergibt sich, daß die Formal,dehvdkondensation in erheblich kürzerer Zeit beendetJist, man kommt nämlich mit weniger als der Hälfte der Zeit aus, die die Kondensation der Sulfonsäure allein erfordert. Beispiel 750 Gewichtsteile Naphthalin (Warmpreßgut) ,verden mit einer Mischung von 56o Gewichtsteilen 96°/(>i-er Schwefelsäure und igo Gewichtsteilen 2oo/oigen Oleums bei 85 bis 95° -s:ulfonriert, dann wird die Sulfonierungsmasse auf 125' hochgeheizt. Nach Abkühlung auf 9o bis g5'° verdünnt man mit 375 Gewichtsteilen Wasser und läßt dann 375 Gewichtsteile Formaldehyd einlaufen. Man rührt das Gemisch 3 Stunden und läßt bei etwa ioo'° ein teilweise sulfoniertes Kondensationsprodukt ein, laufen, das man auf folgende Weise hergestellt hat: Man gibt 69o Gewichtsteile Kresol DAB 4, 570 Gewichtsteile 3o°/oige Formaldehydlösung und. 40o Gewichtsteile Natriumsulfit zusammen und erhitzt das- Gemisch 8 Stunden auf iooi°.It was now. found that d) tanning agents with a good filling capacity and a favorable tannin-non-tanning agent ratio are obtained if sulfonated phenol-formaldehyde condensation products are added and condensed during the formaldehyde condensation of the sulfonic, acids of polynuclear aromatic hydrocarbons, some of which are sulfonated. The technical advantage is that the formal dehdcondensation is completed in a considerably shorter time, namely less than half the time required for the condensation of the sulfonic acid alone. Example 750 parts by weight of naphthalene (hot-pressed material) are sulphonated with a mixture of 56o parts by weight of 96% sulfuric acid and igo parts by weight of 2oo% oleum at 85 to 95 ° -s, then the sulphonation mass is heated to 125 °. After cooling to 90 to g5 °, it is diluted with 375 parts by weight of water and 375 parts by weight of formaldehyde are then run in. The mixture is stirred for 3 hours and a partially sulfonated condensation product, which has been prepared in the following manner, is allowed to run in at about 100 ° 69o parts by weight of Cresol DAB 4, 570 parts by weight of 30% formaldehyde solution and 40o parts by weight of sodium sulfite are combined and the mixture is heated to 100 ° for 8 hours.

Nach der Zugabe dieses Kondensationsproduktes. wird die Masse 2 Stunden auf 8o° erhitzt. Nach Abkühlung auf 40° wird das Gemisch mit wäßrigem Ammoniak neutralisiert und durch Zugabe von Zoo Gewichtsteilen Ameisensäure wieder angesäuert.After the addition of this condensation product. the mass will be 2 hours heated to 80 °. After cooling to 40 °, the mixture is neutralized with aqueous ammonia and acidified again by adding zoo parts by weight of formic acid.

Beim Gerben mit dem so erhaltenen Produkt erhält man ein helles, volles Leder.When tanning with the product thus obtained, a light, full color is obtained Leather.

Claims (1)

PATENTANSPRUCH: Verfahren zur Herstellung synthetischer Gerbstoffe durch Kondensation von Sulfonsäuren mehrkerniger aromatischer Kohlenwasserstoffe mit kernverknüpfenden Mitteln und Zusatz von teilweise sulfonierten Ph,:nolformaldehydkondensation.s.produkten, dadurch gekennzeichnet, daß der Zusatz der letzteren während der Kondensation der ersteren erfolgt.PATENT CLAIM: Process for the production of synthetic tanning agents by condensation of sulfonic acids of polynuclear aromatic hydrocarbons with core-linking agents and the addition of partially sulfonated Ph: nolformaldehydkondensation.s. products, characterized in that the addition of the latter during the condensation of the the former takes place.
DEF3971D 1942-07-07 1942-07-07 Process for the production of synthetic tanning agents Expired DE858562C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEF3971D DE858562C (en) 1942-07-07 1942-07-07 Process for the production of synthetic tanning agents

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF3971D DE858562C (en) 1942-07-07 1942-07-07 Process for the production of synthetic tanning agents

Publications (1)

Publication Number Publication Date
DE858562C true DE858562C (en) 1952-12-08

Family

ID=7084089

Family Applications (1)

Application Number Title Priority Date Filing Date
DEF3971D Expired DE858562C (en) 1942-07-07 1942-07-07 Process for the production of synthetic tanning agents

Country Status (1)

Country Link
DE (1) DE858562C (en)

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