紫苏精油超临界萃取工艺的优化

he essential oil of perilla was extracted by supercritical carbon dioxide extraction with perilla as raw material. On the basis of single factor experiment, the optimum conditions for extracting perilla essential oil were obtained.The optimum process parameters are as follows:The perilla seeds were crushed to 50m 100 mesh; supercritical extraction temperature: 45~55℃;extraction pressure: 305Mpa.Extractive time: 4h;refined separation pressureI: 89Mpa.separation pressureII: 5~6.5Mpa. First-order molecular distillation dehydration,deodorization: distilled I temperature: 60~90C, distillation I vacuum: 500～5000Pa, Flow rate: 200～400g/h,scraper speed: 250～350r/min;second order molecular distillation deacidification: distillation II temperature: 150～170℃, distillation II vacuum degree: 5～20 Pa, built-in condensation temperature: 30～60℃, flow rate: 200～400 g/h, scraper speed: 250～350 r/min; freezing dewaxing: freezing temperature: -5～0℃, freezing time: 16～12h. Extraction rate > 39%.