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| Optimizaiton of deacidification and deplasticization of walnut oil by molecular distillation |
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| KeyWord:walnut oil refining molecular distillation removal of fatty acid removal of plasticizer nutrient |
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| Abstract: |
| In order to improve the quality of walnut oil, the molecular distillation technology was used to remove free fatty acids and plasticizers(DBP, DEHP, DINP) from walnut oil, meanwhile, taking into account the retention of nutrients. The deacidification and deplasticization conditions of walnut oil were optimized by single factor experiment and orthogonal experiment. The results showed that the feeding rate and distillation temperature had a significant effect on the nutrient and DBP, and the distillation temperature and scraping speed had a greater effect on the removal of free fatty acids and DEHP. The optimal conditions were as follows: vacuum degree 0.1 Pa, distillation temperature 170℃, feeding rate 600 mL/h, and scraping speed 350 r/min. Under these conditions, the acid value of walnut oil decreased from 1.08 mgKOH/g to 0.057 mgKOH/g, the content of DBP decreased from 1.54 mg/kg to 0.12 mg/kg, the content of DEHP decreased from 4.83 mg/kg to 0.98 mg/kg, and the content of DINP was not detected. The comprehensive retention rate of vitamin E and sterol reached 82.77%. In summary, the optimized conditions can reduce the plasticizer content to within the standard, get a significant reduction of acid value, and achieve a better retention of vitamin E and sterol. |
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