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Regeneration method for spent bleaching clay

One kind of waste clay and another kind of technology, applied in the field of oil processing, can solve the problem of not being able to simultaneously solve the problems of waste clay recycling, complicated clay treatment process and little practical significance, etc., to achieve excellent oil recovery effect, Conducive to sustainable development and the effect of reducing production costs

Active Publication Date: 2013-07-03
WILMAR SHANGHAI BIOTECH RES & DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the process of this patent white clay treatment is complicated
[0008] Judging from the existing patents, there are certain defects in various methods of treating waste clay, which cannot solve the problems of oil recovery and waste clay reuse at the same time, and the subsequent activation process is complicated, resulting in little practical significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080]Example 1: Take 56.41g of waste clay) in a 500ml Erlenmeyer flask with a stopper, and add 160ml of ethyl acetate according to the ratio of solid to liquid 1:3 (g / ml). In a water-bath shaker, the temperature is controlled at 75°C, the rotation speed is 100r / min, and the leaching time is 1h. Filtrate after leaching, and recover ethyl acetate from the filtrate. The oil content of waste clay is measured to be 27.39%, and the oil recovery rate is 93.86%. The regenerated clay is used to measure the decolorization power according to the following method: Weigh 250 grams of oil sample into a clean reaction cup, add 3% clay, stir at a speed of 250±10 rpm, and heat to 120±2°C. If it is longer than 5±1 minutes, continue to stir at the same speed for 5 minutes (during this period, the temperature should not be lower than 115°C, reheat if necessary), and immediately filter the mixture of oil and clay into a 500ml measuring cylinder while it is still hot, and discard the initial 60ml...

Embodiment 2

[0082] Get 20.57g waste clay in the 500ml Erlenmeyer flask with stopper, add the mixed solvent of 60ml ethyl acetate and glacial acetic acid according to solid-liquid ratio 1: 3 (g / ml), wherein the concentration of glacial acetic acid is the solvent weight ratio of 10%, In a water-bath shaker, the temperature is controlled at 75°C, the rotation speed is 100r / min, and the leaching time is 1h. Filtrate after leaching, recover ethyl acetate and glacial acetic acid from the filtrate, the oil content of waste clay is measured to be 28.68%, and the oil recovery rate is 98.28%. The bleaching clay was measured according to the method in Example 1 for decolorization power, and the decolorization power of this regenerated clay was 90.38%.

Embodiment 3

[0084] Get 44.14g waste clay in the 500ml Erlenmeyer flask with stopper, add the mixed solvent of 135ml isopropanol and oxalic acid according to material-liquid ratio 1: 3 (g / ml), wherein the concentration of oxalic acid is the solvent weight ratio of 10%, in water bath In the shaker, the temperature is controlled at 80°C, the rotation speed is 100r / min, and the leaching time is 1h. Filtrate after leaching, and recover isopropanol and oxalic acid from the filtrate. The oil content of waste clay is measured to be 27.81%, and the oil recovery rate is 93.14%. The bleaching clay was measured according to the method in Example 1 for decolorization power, and the decolorization power of this regenerated clay was 92.31%.

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Abstract

The invention provides a regeneration method for spent bleaching clay. The method comprises the following steps: carrying out treatment by using a solvent at least including two polar compounds, wherein one of the two polar compounds is protonic acid providing a hydrogen ion while the other is a polar solvent with polarity of 3 to 8 and a boiling point of 45 to 85 DEG C, a continuous or batch leaching manner is employed for treatment, time for continuous leaching is 0.5 to 8 h, time for batch leaching is 0.5 to 4 h, and a material-liquid ratio is 1-6: 1 (mL / g); and recovering grease after solvent leaching.

Description

technical field [0001] The invention relates to oil processing, in particular to a method for regenerating waste clay for decolorizing oil. Background technique [0002] Generally, during the refining of vegetable oils and the processing of light-colored industrial oils, activated clay is usually used for decolorization treatment, and its addition amount is 1-5% of the oil mass. After the decolorization treatment, the activated clay loses its activity due to the adsorption of impurities, and becomes a dark brown powdery slag, which sometimes sticks into blocks and becomes waste clay. In addition to white clay, the main components of waste clay also contain neutral oil, metal compounds, residual soap, pigments, free fatty acids, etc. These impurities block the active center of waste clay and make it incapable of decolorization. Most of the oil production enterprises now dump or sell the waste white clay as waste to downstream manufacturers, but it has not been fully utilize...

Claims

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Application Information

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IPC IPC(8): B01J20/34C11B13/04C11B3/10
CPCY02W30/74
Inventor 张余权李磊周盛敏厉秋岳
Owner WILMAR SHANGHAI BIOTECH RES & DEV CENT
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