Rose oil is mostly used in the preparation of cosmetic flavors and food flavors, the fragrance of daily chemical industry, health industry and beverages, cigarettes, etc. The extraction methods are mainly steam distillation, leaching, supercritical extraction, but all Each has its disadvantages. In order to obtain higher purity rose oil and higher efficiency, molecular distillation can be used.
Molecular distillation is a non-equilibrium continuous distillation process carried out under high vacuum conditions. The resolution is higher than conventional distillation, and at the same time, it can solve the thermal sensitivity problems of thermal decomposition and polymerization of materials that cannot be solved by conventional distillation technology.
Purification of rose essential oil using a wiped film molecular distillation device. During the molecular distillation process, factors such as feed rate, feed temperature, evaporation temperature, and wiper speed will affect the separation of rose essential oil.
Through experiments, the range of process parameters: feed rate is 50-70 mL / h, feed temperature is 53-6O ℃, evaporation temperature I is 100-108 ~ C, evaporation temperature II is 120-130 ~ C, operation The pressure is 1.5 Pa, the speed of the scraper is 150-160 r / min, the purity of the rose essential oil product obtained is greater than 86%, the total yield of the separation process is greater than 60%, and it lays the foundation for the optimization of future process parameters.
The experimental process of molecular distillation to purify rose essential oil is divided into two steps. First, the light components including the solvent are removed, that is, degassing and deodorization; then the heavy fraction residue is used as the raw material to remove the heavy components such as wax, which is decolorized. product. After the rose extract melts, the liquid is used as the raw material from the feeder, and then measured into the molecular distillation device. Under the action of the film scraper, it is evenly distributed on the surface of the evaporator. The temperature of the evaporation surface is accurately controlled by the thermal oil.
Under high vacuum conditions, the light components fly directly to the middle condenser in the gas state and condense into a liquid, which enters the light component impurity collector; the heavy fraction enters the heavy component collector along the inner wall of the evaporator barrel. Similarly, the heavy fraction is separated again, and the light component distilled off is the product.
Introduce The Process Of Molecular Distillation To Separate And Purify Rose Essential Oil
没有评论:
发表评论