Comparative study on the quality of soybean oil by acid degumming
The purpose of this study is to provide guidance for the degumming process of soybean oil.Soy-bean oil was degummed using phosphoric acid and citric acid,respectively.Based on single factor experi-ments,the process was optimized using orthogonal experiments.The physiochemical indicators and the rate of oil discharge by two different acids were compared and analyzed.The results showed that the optimal conditions were 55 min,0.6％acid content,4.0％water,and 85 ℃,in which the degumming rate of soy-bean oil is 97.1％,water content is 0.1％,peroxide value is 0.084 mmol/kg,iodine value is 139.1g/100g,and acid value is 2.54mg/g.The optimal citric acid degumming technology conditions are:0.8％acid addi-tion,10.0％acid concentration,20 min degumming duration,2.0％water content,and 80 ℃ degumming temperature.The degumming rate of soybean oil is 95.4％,water content is 0.08％,the peroxide value is 0.039 mmol/kg,the iodine value is 134.2g/100g,and the acid value is 2.31mg/g.The phosphoric acid trea-ted gel oil has better gel removal efficiency.The acid value,peroxide value,water content,iodine value and cost are better.This experiment provides a theoretical basis for selecting the type of acids in soybean oil de-gumming.
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