DE299988C - PROCESS FOR THE MANUFACTURING OF SLIGHTLY SOLUBLE TANNING PREPARATIONS IN COLD WATER - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

· ■ - M 299988 CLASS 2Qa. GROUP

Addendum to patent 284119. ■

~ ■ Patented in the German Empire on January 30, 1914.

Longest duration: October 16, 1927.

"In the main patent 284119 is a process for the production of tanning preparations from tannin extracts, which are easily soluble in cold water, which contain insoluble or poorly soluble components, described therein consisting that the finished, thickened tannin extracts or their insoluble or poorly soluble constituents, or the thin ones to be thickened for the purpose of producing the extracts Broths with such water-soluble, in their molecule one or more acidic salt-forming Groups other than the hydroxyl containing compounds treated as they are from aromatic oxy compounds by condensation with formaldehyde or formaldehyde substances that develop or react with them, or with such added to water-soluble compounds, such as those produced by the condensation of phenol sulfonic acids or whose homologues can be obtained for themselves.

In the additional patent 299857 this process was expanded to include the products claimed in the main patent have other synthetic, tanning properties Possessing compounds, especially those substances whose use as tanning agents is protected in patents 281484 and 290965.

It has now been found that instead of the finished, thickened tannin extracts or their 'insoluble or sparingly soluble components, or the thin broths to be thickened for the purpose of producing the extracts, also directly the Materials containing tanning substances, either immediately or after previous extraction can use with other extracting agents.

Example 1.

That which is used for the production of tanning liquors or tanning extracts vegetable tanning material, e.g. B. Quebracho wood < is after appropriate grinding in the extraction apparatus, as usual, - the Extraction with a hot about 1 ° Be strong aqueous solution of the example 2 of the patent 290965 product described. After deducting this first rich in tannin Broth, the material can be extracted further in any way until it is completely exhausted. The final extraction can z. B. also according to Example 2.

Example 2.>

The material pretreated according to Example 1 or as usual by treating with pure water or weaker tanning liquors or other extracting agents or less exhausted tannin material is at 90 to 100 ° C with a about 1 ° Be strong solution of the example 1 of the patent

26255 $ described anneutralized product briefly treated. For complete removal of about sucked from the Exträktiorisbrühe from Gerbmaterial product, the material ⁷ is then subjected to a treatment with pure water in boiling heat. The broths thus obtained can, for. B; can be used on their own for tanning purposes or as follow-up brews.

An analogous procedure is used for the extraction of other materials containing tannin as well when using other dissolving agents of the type identified at the beginning.

Claims (1)

Patent claim: 'Further development of the method of patent 284119 ^ and its addition 299857, consisting in the fact that the materials containing the tanning substances, be it immediately, be it after previous extraction with other extracting agents Funds, used.