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| Application of special silica gel in oil refining process |
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| DOI： |
| KeyWord:silica gel SORBSIL series oil refining adsorption degumming anhydrous de-saponification chloride ion removal |
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| Abstract: |
| The special silica gel was used for adsorption degumming, adsorption de-saponificating, adsorption bleaching and chloride ion removal. The feasibility of the application of the special silica gel in the oil refining process was evaluated by studying the process conditions and removal effects. The results showed that the adsorption degumming of fragrant peanut oil was carried out by SORBSIL??R92 silica gel. Under the conditions of silica gel dosage 0.5%, reaction temperature 80?℃ and reaction time 15 min, the phospholipid removal rate was 96.2%, and the degumming oil had bright color and good flavor retention. The deacidified soybean oil obtained by alkali refining was de-saponificated with SORBSIL??R92 silica gel, and the soap content in the oil reduced from 130.7 mg/kg to undetected. Compared with the water-washed method, the silica gel adsorption could not only reduce the soap content in the oil, but also realize zero discharge of wastewater and reduce the oil loss during de-saponification process. SORBSIL?R40F silica gel was used to bleach the soybean oil under optimized conditions (first adding 0.08% SORBSIL??R40F silica gel, then adding 1.57% activated clay after adsorption reaction), and the phosphorus content was significantly lower than that in the oil bleached with activated clay. The color and oxidation stability of the deodorized oil were better than that of the deodorized oil after bleaching with activated clay. The soybean oil was adsorbed by SORBSIL??R40F silica gel and SORBSIL??R92 silica gel at 100?℃ for 20 min, and the chloride ion contents in the oil reduced by 2847% and 18.98%, respectively. That was advantageous for preventing and reducing the formation of 3-chloropropanol esters and glycidyl esters in the deodorization process of oils. In summary, the special silica gel SORBSIL??R92 and SORBSIL??R40F had good application prospect in the improvement and development of oil refining technology. |
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