DE2649906A1 - METHOD AND DEVICE FOR LANOLIN CLEANING - Google Patents

Description

Method and device; for lanolin cleaning

The present invention relates to a method for purifying lanolin, in particular for use in cosmetic and pharmaceutical industry, where the raw lanolin comes either from the wash water of the wool, directly from the wool obtained by extraction with organic solvents or from the washing water of sheepskins. The invention further relates to a device for carrying out the method.

There are already methods for lanolin cleaning known in which repeated washes with alkaline solutions at a Temperature of 50 - 100 ° C can be carried out or cleaning by steam distillation and subsequent treatment done with animal charcoal.

Other known methods use oxidizing agents such as potassium permanganate and chromium.

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These known cleaning methods have the disadvantage that their efficiency is low and the lanolin obtained because of the Cleaning conditions undergoes changes in composition. Furthermore, these methods must be complicated Devices are used.

Chromatographic purification processes are also known, with aluminum oxide or other adsorbents as the carrier substance be used. These processes have the disadvantage that extraction gasoline is used in the lanolin extraction must be, which is known to be a highly flammable toxic solvent and thus on the one hand the risk of explosions brings and on the other hand makes expensive equipment necessary. The necessary devices consist of associations of adsorption columns, mixing vessels for the oxidizing agents, settling vessels, neutralization and washing vessels, evaporators, Condensation vessels and distillation columns for the recovery of solvents. These devices are natural complicated, expensive and with a high level of energy consumption tied together.

It is therefore an object of the present invention to avoid these disadvantages, in particular to provide a method create that in a simple manner, with a high degree of efficiency and using a harmless solvent high purity lanolin.

This object is achieved in that the

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Raw lanolin is dissolved in carbon tetrachloride in an amount of 10-15 % and the resulting solution is mixed with an amount of bentonite which is two to four times greater than the amount of lanolin in the solution, that then the mixture is subjected to an extraction with carbon tetrachloride and that finally concentration is carried out in vacuo at 50-60 ° C, whereby lanolin of cosmetic or pharmaceutical purity is obtained, depending on the amount of bentonite used.

According to the invention, a mixing vessel is used to carry out the method used to produce the mixture of bentonite and the solution of the crude ethanolin in carbon tetrachloride, furthermore an extractor, equipped with a stirrer for solid materials and a heating mantle, which also allows the extractor below the Level of the filter cloth covered and an evaporator for vacuum evaporation of the carbon tetrachloride, in which after the Evaporation of the carbon tetrachloride leaves the pure lanolin behind.

Further features and advantages of the invention emerge from the following description of an exemplary embodiment on the basis the drawing.

The raw technical lanolin is placed in a vessel equipped with a stirrer and a heating mantle. The lanolin is melted in this vessel at a temperature of 40 - 50 ° C, after which it is placed in a vessel 2 with a stirrer

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where the dissolution in carbon tetrachloride takes place, the is supplied from a metering vessel 3, which in turn is fed by a pressure bulb 4. The amount of carbon tetrachloride to be dosed is calculated in such a way that a 10-15% lanolin solution is obtained. The prepared solution is in a pressure pear 5, from where it is brought into a vessel 6 equipped with a stirrer that is more solid for the mixture Suitable materials. Here the solution is mixed with an amount of bentonite that is two to four times greater than the amount of lanolin in the liquid. The resulting suspension is placed in an extractor 7 equipped with a heating mantle is, which encases the extractor below the level of the filter cloth and also has a stirrer, which suitable for mixing solid substances. In the extractor 7, the lanolin extraction is carried out with carbon tetrachloride, which is supplied by the dosing vessel 3. The lanolin extract will then passed into an evaporator 8, where part of the carbon tetrachloride evaporates in a condenser 9 with cooling coils condensed. The carbon tetrachloride resulting from the condensation of the steam is recycled into the Dosing vessel 3, from where it enters the extractor 7 again, so that the extraction can continue continuously until in There is no more lanolin in the extractor. The carbon tetrachloride, which is free in the extractor 7, is in a Evaporator 8 passed, which is kept under vacuum by means of the vacuum pump 10. The carbon tetrachloride that absorbs and remained after the desorption, is returned

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gained by evaporation in a vacuum and in this sense circulates the steam through the jacket of the extractor 7, which is in connection with a vacuum pump 10. After the recovery the total amount of carbon tetrachloride from the extractor that is fed into the metering vessel 3 becomes the bentonite used placed in a kiln 11, where its regeneration takes place at 600-800 ° C. Then the bentonite can be used again can be used for further cleaning. Finally, there is a connection between the evaporator 8, through whose jacket water of 50 - 60 ° C, and the vacuum pump 10 is established, whereby the total amount of carbon tetrachloride that is in the vessel 3 was collected, evaporated, so that in the evaporator 8, the purified lanolin remains in a molten state, the is finally brought into the collecting vessel 12.

The invention has the following advantages in particular:

- The efficiency achieved in cleaning the lanolin is significantly higher than with processes according to the state of the art.

- The process works with a very low consumption of materials, since carbon tetrachloride and bentonite are recovered and reused in a continuous process.

- The process works with carbon tetrachloride, a non-flammable solvent.

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- The device according to the invention is technologically simple; as it is a closed system, there is no risk of poisoning.

Literature: DT-PS 2 328 108

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Claims (3)

Patent claims i'l'i method for purifying lanolin, especially for Use in the cosmetic and pharmaceutical industry, characterized, that a 10-15% solution of crude lanolin in carbon tetrachloride produced the solution obtained with a two to four times greater amount of bentonite than the amount of lanolin mixed in the solution, the resulting mixture of an extraction with carbon tetrachloride and the solution is evaporated in vacuo at 50-60 ° C, depending on the used Bentonite amount of lanolin is obtained in cosmetic or pharmaceutical purity. 2. Device for performing the method according to claim 709823/0639 -2-ORlQINAL INSPBCTED ρ marked by a mixing vessel (6) for the preparation of the mixture of bentonite and the solution of the crude ethanolin in C Cl ₄ , an extractor (7), provided with a stirrer for solid materials and an ileizmantel, which surrounds the extractor below the level of the filter cloth and a Evaporator (8) for vacuum j evaporation of the C Cl ^. 3. Device according to claim 2, characterized in that that a kiln (11) is also provided to regenerate the bentonite » 70982 3/0639