DE381414C - Process to make difficult or insoluble tannins easily soluble in cold water - Google Patents

Process to make difficult or insoluble tannins easily soluble in cold water

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Publication number
DE381414C
DE381414C DEH64719D DEH0064719D DE381414C DE 381414 C DE381414 C DE 381414C DE H64719 D DEH64719 D DE H64719D DE H0064719 D DEH0064719 D DE H0064719D DE 381414 C DE381414 C DE 381414C
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DE
Germany
Prior art keywords
cold water
easily soluble
make difficult
tannins
insoluble
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
DEH64719D
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German (de)
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Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DEH64719D priority Critical patent/DE381414C/en
Application granted granted Critical
Publication of DE381414C publication Critical patent/DE381414C/en
Expired legal-status Critical Current

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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
    • C14C3/12—Vegetable tanning using purified or modified vegetable tanning agents

Description

Verfahren, um schwer oder nicht lösliche Gerbstoffe in kaltem Wasser leicht löslich zumachen. Bekanntlich lösen sich viele natürlicheGerbstoffe in kaltem Wasser nur schwer oder unvollständig. Nach dem Verfahren des Patents 284119 kann man diese Gerbstoffe löslich machen durch Behandlung mitKondensationsprodukten, die aus Phenolsulfosäuren durch Erhitzen für sich oder mit Formaldehyd erhalten werden. An Stelle dieser Kondensationsprodukte hat man ferner nach dem Verfahren des Patents 299857 auch schon die Sulfosäuren aromatischer Kohlenwasserstoffe und ihre Kondensationsprodukte mit Formaldehyd für den erwähnten Zweck verwendet.Process to make difficult or insoluble tannins easily soluble in cold water. It is known that many natural tanning agents dissolve only with difficulty or incompletely in cold water. These tanning agents can be solubilized by treatment with condensation products obtained from phenol sulfonic acids by heating by themselves or with formaldehyde according to the method of patent 2841 19. In place of these condensation products, the sulfonic acids of aromatic hydrocarbons and their condensation products with formaldehyde have also been used for the above-mentioned purpose according to the method of patent 299857.

Es wurde hier gefunden, daß auch die durch bloßes Erhitzen der Sulfosäuren aromatischer Kohlenwasserstoffe erhaltenen Kondensationsprodukte (Sulfonsulfosäuren) die unlöslichen Gerbstoffe in Lösung bringen können. Diese Stoffe haben sogar erheblich stärker lösende Wirkung als die obengenannten Produkte.It has been found here that even those obtained by simply heating the sulfonic acids condensation products obtained from aromatic hydrocarbons (sulfonic sulfonic acids) can bring the insoluble tannins into solution. These substances have even considerably stronger dissolving effect than the above products.

Den schwer löslichen Gerbstoffen werden die Salze der oben aufgeführten Kondensationsprodukte kalt oder warm zugesetzt. Man erhält dann sofort Produkte, die in kaltem Wasser bei jeder Verdünnung klar löslich sind.The poorly soluble tannins are the salts of the above Condensation products added cold or warm. You will then immediately receive products which are clearly soluble in cold water at every dilution.

Vorteilhaft setzt nian die Stoffe schon bei der Extraktion der Gerbstoffe aus Gerbhölzern usw. zu. Die Extraktion wird dadurch beschleunigt und die Ausbeute verbessert. Beispiel. ioo Teile Quebrachoextrakt von etwa 25° Be werden mit 15 Teilen des Natriumsalzes des durch Erhitzen von Naphthalin-ß-sulfosäure erhaltenen .Kondensationsproduktes, das in 2o Teilen Wasser gelöst ist, unter Rühren versetzt. Die Masse wird rasch dünnflüssig und löst sich nun in jeder Verdunnung klar im Wasser.Nian already uses the substances during the extraction of the tannins from tannins, etc. too. This speeds up the extraction and the yield improved. Example. 100 parts of quebracho extract of about 25 ° Be are made with 15 parts of the sodium salt of the condensation product obtained by heating naphthalene-ß-sulfonic acid, which is dissolved in 2o parts of water, added with stirring. The crowd is growing rapidly thin and now dissolves clearly in the water in every dilution.

Das Kondensationsprodukt wird dargestellt durch Erhitzen von Naphthalin-ß-sulfosäure, erhalten aus ioo Teilen Naphthalin mit ioo Teilen konzentrierter Schwefelsäure, auf etwa 18o°, bis das Produkt sowohl wie sein Natriumsalz leicht in Wasser löslich ist.The condensation product is produced by heating naphthalene-ß-sulfonic acid, obtained from 100 parts of naphthalene with 100 parts of concentrated sulfuric acid, to about 180 ° until the product and its sodium salt are readily soluble in water is.

Die lösende Wirkung wird nicht nur durch das Natriumsalz, sondern ebenso durch die freie Säure und .auch z. B. durch das Kalziumsalz erzielt, zum Unterschied von den Kondensationsprodukten aus Naphthalinsulfosäuren und Formaldehyd.The dissolving effect is not only due to the sodium salt, but also by the free acid and .auch z. B. achieved by the calcium salt, for Difference from the condensation products of naphthalene sulfonic acids and formaldehyde.

Claims (1)

PATENTANSPRUCH: Verfahren, um schwer oder nicht lösliche Gerbstoffe in kaltem Wasser leicht löslich zu machen, darin bestehend, daß man den Gerbextrakten oder Gerbbrühen die durch Erhitzen der Sulfosäuren aromatischer Kohlenwasserstoffe erhaltenen Kondensationsprodukte oder deren Salze zusetzt. PATENT CLAIM: Process for making sparingly or insoluble tanning agents readily soluble in cold water, consisting in adding the condensation products obtained by heating the sulfonic acids of aromatic hydrocarbons or their salts to the tanning extracts or tanning liquors.
DEH64719D 1913-12-20 1913-12-20 Process to make difficult or insoluble tannins easily soluble in cold water Expired DE381414C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEH64719D DE381414C (en) 1913-12-20 1913-12-20 Process to make difficult or insoluble tannins easily soluble in cold water

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH64719D DE381414C (en) 1913-12-20 1913-12-20 Process to make difficult or insoluble tannins easily soluble in cold water

Publications (1)

Publication Number Publication Date
DE381414C true DE381414C (en) 1923-09-20

Family

ID=7162833

Family Applications (1)

Application Number Title Priority Date Filing Date
DEH64719D Expired DE381414C (en) 1913-12-20 1913-12-20 Process to make difficult or insoluble tannins easily soluble in cold water

Country Status (1)

Country Link
DE (1) DE381414C (en)

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