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Selective adsorption and discoloring method for vegetable oil

A technology for adsorption and decolorization of vegetable oil, applied in the field of selective adsorption and decolorization of vegetable oil, which can solve the problems of oil loss and excessive removal

Inactive Publication Date: 2018-11-13
WUHAN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the natural pigments such as chlorophyll, carotenoids, and lutein are harmless, and excessive removal is unnecessary
In the existing adsorption decolorization method, when a certain color value in the oil is high, the method of increasing the amount of decolorizer is usually used to reduce it to a certain color value. In this process, other original color values Low color will also reduce a lot, and too much adsorbent will also absorb 20% to 40% of oil, resulting in excessive loss of oil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 5Kg of crude rapeseed oil obtained by hot pressing was used as vegetable oil to be decolorized, 25g of activated carbon was added thereto, stirred at normal temperature and pressure for 30min, then vacuum filtered and the filtrate was collected to obtain decolorized rapeseed oil.

[0028] Among them, the color of the rapeseed oil to be decolorized is opaque brown, and its color value exceeds the detection range of the instrument (yellow 79.9, red 79.9, blue 49.9); and the color of the decolorized rapeseed oil turns into transparent green, the finished color The color value (color Lovibond 25.4mm slot) is yellow 45, red 4, blue 1, which can meet the color value required by the enterprise.

Embodiment 2

[0030] Use 5Kg of crude rice bran oil produced by hot pressing as the vegetable oil to be decolorized, add 150g of activated clay and 5g of phosphoric acid (phosphoric acid promotes the adsorption of colored substances by activated clay), stir for 5min under vacuum at 260°C, and then rapidly cool to 70°C. ℃, then filter and collect the filtrate to obtain decolorized rice bran oil.

[0031] Among them, the color value of the rice bran oil to be decolorized (color color Lovibond 133.4 tank) is yellow 35, red 8; while the color value of the decolorized rice bran oil is yellow 35, red 3.5, compared with the color value of the rice bran oil to be decolorized, the color value of red is significantly lower , and the color value of the decolorized rice bran oil meets the color value required by the enterprise.

Embodiment 3

[0033] 5Kg of crude corn oil obtained by hot pressing was used as vegetable oil to be decolorized, 25g of activated carbon was added thereto, stirred at room temperature for 30min, then vacuum filtered and the filtrate was collected to obtain decolorized corn oil.

[0034]Wherein, the color of the corn oil to be decolorized is opaque brown, and its color value exceeds the detection range of the instrument (yellow 79.9, red 79.9, blue 49.9); and the color of the decolorized corn oil changes into a transparent state, and the finished color value (color Lovibond 25.4mm groove) is yellow 45, red 4, blue 1, which can meet the color value required by the enterprise).

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PUM

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Abstract

The invention discloses a selective adsorption and discoloring method for vegetable oil, which is used for discoloring in refining of vegetable oil. The adsorption and discoloring method for the vegetable oil comprises the following steps of adding an adsorbent into to-be-discolored vegetable oil, heating, stirring, and selectively adsorbing and discoloring; filtering, and collecting filtrate, soas to obtain the discolored vegetable oil, wherein the to-be-discolored vegetable oil is deep-color crude oil of the vegetable oil which is extracted by hot pressing. The adsorption and discoloring method has the advantages that the adsorbent is added into the to-be-discolored deep-color vegetable oil which is extracted by the hot pressing, and is heated and stirred, so as to complete the selective adsorption and discoloring; then, the to-be-discolored deep-color vegetable oil is filtered, and the filtrate is collected, so as to obtain the discolored vegetable oil; the color value meets the enterprise color value requirements of the vegetable oil.

Description

technical field [0001] The invention relates to the technical field of vegetable oil processing, in particular to a selective adsorption decolorization method for vegetable oil. Background technique [0002] There are many methods for oil decolorization, mainly including adsorption decolorization, heating decolorization, oxidation decolorization, chemical reagent decolorization, etc. The most widely used method in industrial production is adsorption decolorization. Oils and fats contain different pigments in different quantities and varieties: organic pigments (chlorophyll, carotenoids, lutein) and organic degradation products. These substances make vegetable oils appear green, red, and yellow. Tan, even black. The traditional adsorption decolorization is to remove these colored substances in the oil to make the oil appear colorless or light-colored oil that meets the national standard of edible oil (in the national standard of edible oil, different oils and different grade...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11B3/10
CPCC11B3/10
Inventor 齐玉堂张维农
Owner WUHAN POLYTECHNIC UNIVERSITY
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