DE965347C - Process for the production of color-stable paraffinic hydrocarbons - Google Patents

Description

ISSUED JUNE 6, 1957

R 10155 IVel23b

Hydrocarbons produced with the aid of catalytic hydrogenation of carbohydrates, in particular Table paraffins and liart waxes obtained in this way usually have one in their raw state yellow to dark brown color, an undesirable odor and unpleasant accompanying substances. By Refined hydrogenation can get rid of these deficiencies, and pure white, odorless, saturated Obtain hydrocarbons. If products treated in this way in non-darkened rooms, especially in the warmth and with free access λ'οη air, then the color changes Material, which results in an undesirable decrease in value.

It has been found that color-stable products result if the refining Carries out hydrogenation in the presence of catalysts containing both nickel metal and copper metal contain. A ratio of 1 part by weight of nickel metal to 1 part by weight has been found Copper metal best proven. With these catalysts, for example, a raw, brown Hard wax from the Fischer-Tropsch synthesis converted into a colorless product within 40 minutes that neither if stored for 6 months in the air in a non-darkened area Room still darkened when kept in a molten state for over 48 hours. In the The refining hydrogenation had to use catalysts containing only nickel metal be extended to 110 minutes to achieve the same degree of color, whereby the

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end products held by far did not have the same stability. If a certain The space-time yield of color-stable products has the same proportion of nickel and Copper-containing catalyst has a more than 170 Vo better effectiveness compared to the known Nickel - magnesium oxide - diatomaceous earth - catalyst.

A particularly effective catalyst consists, for example, of 100 parts by weight of nickel metal, 100 parts by weight of copper metal, 20 parts by weight Magnesium oxide and 200 parts by weight of diatomite. This catalyst can be produced by soda precipitation from the nitrates or chlorides of the metals in a known manner with stirring in of Kieselguhr and subsequent reduction can be easily produced. As for all MgO activated Catalysts it is also when using this catalyst to increase its activity and Extension of its service life expedient if the hydrocarbons to be processed or hydrocarbon mixtures are pretreated with MgO. The catalyst described can be used in a fixed arrangement or as a suspension in liquid or molten products will.

example

An above 380 ⁰ C boiling Hajrtwachs from the Fischer-Tropsch process was in a continuously operating Hydrierkolonne with fixed bed catalyst at 250 ⁰ C and a hydrogen partial pressure of 75 atmospheres gauge with one hand, nickel-magnesium oxide-kieselguhr catalyst

Claims (2)

PATENT CLAIMS: 1. Process for the production of non-darkening colorless table paraffins and hard waxes from colored crude hydrocarbon mixtures corresponding boiling point, which was obtained in particular by means of catalytic carbohydrate hydrogenation, by short-term refining hydrogenation using hydrogenation catalysts, characterized in that the catalysts are simultaneously metallic nickel and metallic Contain copper. 2. The method according to claim 1, characterized in that that one uses catalysts which contain nickel metal and copper metal in equal amounts by weight. Considered publications:
USA. Patents No. 1,890,434, 1,876,009, ι 895769;
Austrian patent specification No. 157 112. (100 parts by weight of nickel, 15 parts by weight Magnesium oxide and 50 parts by weight of kieselguhr) and on the other hand with Niekel copper-magnesium oxide-kieselguhr catalyst (100 parts by weight of nickel metal, 100 parts by weight of copper metal, 20 Parts by weight of magnesium oxide and 200 parts by weight of kieselguhr) fully hydrogenated. To achieve of a color-stable refined product was a residence time in the reaction space in the first case of 110 minutes and in the second case of about minutes. 709 535/347 5.