Regeneration method of silica gel bleaching sand for petroleum or animal and vegetable oil refining

Abstract

The invention provides a regeneration method of silica gel bleaching sand for petroleum or animal and vegetable oil refining. The method comprises steps as follows: 1, primary extraction: (1) to-be-processed waste silica gel bleaching sand is added to an extraction reaction kettle, and the extraction reaction kettle is filled with nitrogen for replacement for three times; (2) a nonpolar solvent is added to the extraction kettle, the volume ratio of the silica gel bleaching sand to the nonpolar solvent is 1:1, and the mixture is stirred at the temperature of 30-60 DEG C for 10-20 min; (3) nitrogen pressure filtration is performed after stirring, the pressure is controlled to range from 0.1 Mpa to 0.2 Mpa, and the filtrate is an enrichment liquid; 2, secondary extraction and regeneration: (1) a mixed liquid of the nonpolar solvent and n-butyl acetate to the extraction reaction kettle, and the volume ratio of the mixed liquid to the waste silica gel bleaching sand is 1:1; (2) the mixture is stirred at the temperature of 30-60 DEG C for 30-60 min and dried after filtered, and regeneration is finished. With the adoption of the method, the silica gel bleaching sand for petroleum or animal and vegetable oil refining can be treated, and the waste silica gel bleaching sand can be regenerated.

Description

technical field [0001] The invention belongs to the technical field of petroleum refining, and in particular relates to a regeneration method of silica gel decolorizing sand used for refining petroleum or animal and vegetable oils. Background technique: [0002] In the processing and production of petroleum or animals and plants, in order to obtain ideal components, after pre-treatment, use silica gel decolorizing sand for subsequent supplementary refining, the purpose is to remove residual non-ideal components and improve product quality. Silica gel decolorizing sand loses activity after reaching saturation. While adsorbing non-ideal components, silica gel decolorizing sand also adsorbs about 35% of ideal components. If it is not treated, this is very detrimental to environmental protection and less oil consumption. At present, there are mainly five regeneration methods of waste silica gel decolorizing sand: one is the high-pressure pressing method, which contains 10% oil ...

AI Technical Summary

Problems solved by technology

At present, there are mainly five regeneration methods of waste silica gel decolorizing sand: one is high-pressure pressing method, which contains 10% oil (weight ratio) after pressing, and silica gel decolorizing sand cannot be recycled.

The second is the alkaline water boiling method. This method can only recover 5-20% (mass ratio) oil, and the quality is not good. At the same time, the structure of the silica gel decolorizing sand is destroyed, and a large amount of waste water is generated.

The third kind of calcination produces energy, the utilization rate is low, the white clay after calcination has been deactivated, and the exhaust pollution is serious

The fourth non-polar solvent and ethanol extraction method, using this method can only restore 90% of the activity

The fifth method: use non-polar solvents to add ethanol and add active agents. This method can only regenerate the silica gel decolorizing sand used for petroleum, but cannot regenerate the silica gel decolorizing sand used for animal and vegetable oils.

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