DE565055C - Process for cleaning carnauba wax and similar vegetable waxes - Google Patents

Description

Process for cleaning carnauba wax and similar vegetable Waxing It is known that waxes of all kinds can be dissolved with decolorizing agents, such as active coals, fuller's earths and the like, can lighten. As a solvent were for this or similar purposes up to now benzene, gasoline or carbon disulfide used.

If you have carnauba wax or similar vegetable waxes on this known way cleanses. in this way, however, a brightening is achieved. The degree of lightening However, it remains relatively small if you do not use extremely large amounts of the said decolorizing powders.

It has now been found to be useful in cleaning carnauba wax and similar vegetable waxes in a dissolved state with decolorizing powders it does not matter which solvent is used to absorb these waxes, and that when using certain solvents despite a moderate amount of decolorizing powders a particularly high degree of lightening is achieved.

A surprisingly favorable effect is achieved according to the invention, if you put carnauba wax in oxygenated organic solvents in the heat absorbs and this solution is treated in a known manner with decolorizing powders. Among the oxygen-containing organic solvents are preferably methyl alcohol and its homologues, esters, ethers, - ketones, e.g. B. butanone, as well as the corresponding Polyhydric alcohol compounds, e.g. B. the derivatives of glycol, etc., into consideration. Particularly bright and pure products are produced when using ethyl acetate Solvent recovered.

Among the decolorizing agents, highly active decolorizing carbons, in particular the carbon activated by using zinc chloride, brand "Carboraffin", proved to be particularly advantageous, but of course other decolorizing powders, such as fuller's earth, silica gel and the like.

The use of the solvents mentioned when cleaning the carnauba wax with decolorizing powders offers compared to the use of previously for this purpose used solvents not only the advantage that a stronger degree of whitening or a saving in decolorizing powder achieved with the same cleaning effect but it also increases the yield of purified wax because. latter naturally depends on the amount of decolorizing powder used.

When carrying out the process, the starting material is initially expediently in the comminuted or ground state in the solvent, e.g. B. dissolved in hot ethyl acetate. The solution is stirred or shaken with the Decolorizing agent added, digested with the decolorizer for some time and then thoroughly Filter off or centrifuge separately from this. The filtrate becomes through Distilling off the solvent, the purified carnauba wax in obtained light yellow or even almost white color. "" The recovered solvent can be used again and again to clean the wax. From the applied Decolorizing agents can be obtained by extraction with liquids containing carnauba wax easily dissolve, the retained wax can be recovered. The decolorizing agent can then by glowing in a stream of carbonic acid or in some other way known per se be regenerated.

Instead of applying all of the decolorizing agent at once on the wax solution to let it act, you can do it in individual stages, z. B. in two parts, add to; you can also work expediently according to the countercurrent principle, whereby a further saving and better utilization of the decolorizing agent is achieved. Examples i. 50 parts of carnauba wax (fat gray) are converted into qoo parts in the heat Ethyl acetate dissolved. 1.25 parts of carboraffin (active charcoal) are added to the solution and stirred under gentle boiling for about an hour. After filtering and Evaporation of the solvent gives a light yellow wax.

Around the same carnauba wax in a benzene solution with carboraffin To refine the same brightness level, about three times the amount of carboraffin must be used be applied. The yield of pale wax is noticeable after filtration less.

2. 50 parts of the same starting material as in Example i are dissolved in 500 parts of ethyl acetate, whereupon the resulting solution is treated with 20 parts of carboraffin in the manner described above. After the solvent has been filtered off and evaporated off, an almost white product is obtained. 3.5o parts of carnauba wax of gray-green color are dissolved in 300 parts of ethyl alcohol under heat. The hot solution is mixed with 2 parts of fuller's earth and stirred under reflux for 30 minutes. The mixture is then mixed with 2 parts of a decolorizing carbon activated with zinc chloride and refluxed for a further 30 minutes with stirring. After filtering off the decolorizing powder and distilling off the alcohol, a light wax with a greenish hue remains.

4 .. 50 parts of carnauba wax, brand "sand gray", are divided into 400 parts Glycol monomethyl ether dissolved. The solution is otherwise, as described under Example i, treated. Pure yellow wax is obtained, which in its color corresponds to the carnauba wax brand Corresponds to "pile yellow".

5. 50 parts of raw candelilla wax are dissolved in 500 parts of butanone and digested for 1 hour at boiling point with 3 parts of active charcoal ("carboraffin"). The product freed from the decolorizing powder and the solvent shows a light, yellowish color and is particularly suitable for the production of light creams.

The application of pressure in cleaning solutions of the carnauba wax and like vegetable waxes in amyl alcohol and its esters by treatment with decolorizing powders is not claimed here.

Claims (1)

PATENT CLAIM: Process for cleaning carnauba wax and the like vegetable waxes in a dissolved state by means of decolorizing powder, characterized in that that one is used as a solvent for the raw or pre-cleaned wax containing oxygen organic. Solvents, such as alcohols, esters, ethers or ketones, in the heat used.