Octacosanol is purified by agitated short-path distillation (SPD). Effects of evaporation temperature,number of SPD steps in series and other distillation method on the octacosanol recovery and decomposition are studi...Octacosanol is purified by agitated short-path distillation (SPD). Effects of evaporation temperature,number of SPD steps in series and other distillation method on the octacosanol recovery and decomposition are studied. Although the experimental results indicate some decomposition when the mixture of higher primary aliphatic alcohols is distillated by SPD, SPD is still an effective method to purify octacosanol. It is concluded that evaporation temperature affects greatly on the purity and recovery of octacosanol.展开更多
Short path distillation (SPD) is a kind of high vacuum distillation method, which is suitable for the separation of high boiling, heat sensitivity and viscidity products.In this paper,through measuring the phase-avera...Short path distillation (SPD) is a kind of high vacuum distillation method, which is suitable for the separation of high boiling, heat sensitivity and viscidity products.In this paper,through measuring the phase-averaged velocity distributions with a conditional sampling method of the particle imaging velocimetry (PIV), the liquid flow field that affects the heat and mass transfer of evaporating thin-film in an SPD evaporator is investigated.Measured results show that the flow velocities decrease rapidly apart from the wiper at different wiper velocities, the maximum velocity appears before wipers, and the quicker the wiping, the larger the flow velocity. Meanwhile, the evaluation of numerical calculations is carried out.The measured velocity distributions indicate clearly the effect of the wiper both on the flow field along its moving direction and on the vortices behind the wiper.Simulation data show that the performance of liquid flow field on the heating surface not only agrees with the experimental results well,but also can give further more information, such as the distribution of turbulent kinetic energy.In this study,turbulent kinetic energy mainly distributes before wipers and laminar flow appears far away from the wipers.展开更多
Pharmaceutical oil is obtained from peanut oil by wiped film short path distiller(SPD).The concentration ofeffective unsaturated fatty acids in the pharmaceutical oil is more than five percentages,the evaporation rate...Pharmaceutical oil is obtained from peanut oil by wiped film short path distiller(SPD).The concentration ofeffective unsaturated fatty acids in the pharmaceutical oil is more than five percentages,the evaporation rate is more than25%.The experiment results indicate that the optimum technology parameters for wiped film SPD are that feed flow rateis 131 mL/h,operation pressure is 0.1 Pa,agitation speed is 140 rmp,temperature of feed is 190℃and the best evapo-ration is 260℃.展开更多
基金Supported by the National Natural Science Foundation of China(No. 20176037), and the Development Foundation from the Science & Technology Commission of Tianjin, China (No. 01310864).
文摘Octacosanol is purified by agitated short-path distillation (SPD). Effects of evaporation temperature,number of SPD steps in series and other distillation method on the octacosanol recovery and decomposition are studied. Although the experimental results indicate some decomposition when the mixture of higher primary aliphatic alcohols is distillated by SPD, SPD is still an effective method to purify octacosanol. It is concluded that evaporation temperature affects greatly on the purity and recovery of octacosanol.
文摘Short path distillation (SPD) is a kind of high vacuum distillation method, which is suitable for the separation of high boiling, heat sensitivity and viscidity products.In this paper,through measuring the phase-averaged velocity distributions with a conditional sampling method of the particle imaging velocimetry (PIV), the liquid flow field that affects the heat and mass transfer of evaporating thin-film in an SPD evaporator is investigated.Measured results show that the flow velocities decrease rapidly apart from the wiper at different wiper velocities, the maximum velocity appears before wipers, and the quicker the wiping, the larger the flow velocity. Meanwhile, the evaluation of numerical calculations is carried out.The measured velocity distributions indicate clearly the effect of the wiper both on the flow field along its moving direction and on the vortices behind the wiper.Simulation data show that the performance of liquid flow field on the heating surface not only agrees with the experimental results well,but also can give further more information, such as the distribution of turbulent kinetic energy.In this study,turbulent kinetic energy mainly distributes before wipers and laminar flow appears far away from the wipers.
基金The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China(NNSFC,NO:20176037),and the Development Foundation from the Science & Technology Commission of Tianjin Municipal People's Govemment,P.R.China (NO:0131086114).
文摘Pharmaceutical oil is obtained from peanut oil by wiped film short path distiller(SPD).The concentration ofeffective unsaturated fatty acids in the pharmaceutical oil is more than five percentages,the evaporation rate is more than25%.The experiment results indicate that the optimum technology parameters for wiped film SPD are that feed flow rateis 131 mL/h,operation pressure is 0.1 Pa,agitation speed is 140 rmp,temperature of feed is 190℃and the best evapo-ration is 260℃.
