Application of Multistage Steam Distillation Column for Extraction of Essential Oil of Rosemarinuse officinialis L.
Volume 9, Issue 4, Autumn 2012, Pages 54-64
M. Malekydozzadeh, P. Khadiv-Parsi, Sh. Rezazadeh, H. Abolghasemi, Z. Salehi, Q. Li
Abstract In this work, a new process design and clean production to increase the yield of steam distillation of rosemary essential oil was studied. For extraction of essential oil, a packed bed of rosemary was exposed to the steam flow. For improving the total yield, multistage bed column was used. The effects of steam flow rate, height of plant bed, multistage beds and time of extraction on yield and composition of the oil were studied. Also, trend of three major components of the oil during different extraction times and conditions were observed. We determined minimum steam to be passed through the packed bed so that there is minimum water in the distillation and hence, steam channeling phenomenon was overcome. Furthermore, we obtained optimum steam flow rate and time for extraction of the oil. Using a multistage column with suitable steam redistributors results in reduction of pressure drop, and steam channeling in the
column, hence, increacing the yield of extraction. This research revealed different behaviors of the main components of rosemary oil; α-pinene, 1,8-cineole and camphor in treating with amount of steam flow rate.
The Effects of Operational Parameters on the Efficiency of a Mixer-Settler Extractor
Volume 2, Issue 1, Winter 2005, Pages 10-23
H. Abolghasemi, H. Bahmanyar, M. Ghanadi Maragheh
Abstract The effects and influences of various operational parameters on the efficiency of mixer-settlers are thoroughly studied in this paper. One of the most important factors in designing a mixer-settler is to obtain an optimum operational extraction and overall efficiency. These two factors are dependent on various parameters such as impeller shape, size and speed of impeller, baffle size, residence time, volumetric flow rates and the ratio of heavy to light phases. In this paper, the effect of impeller speed and volumetric flowrates of two phases on efficiency are studied. Also, the effect of hold-up of each stage upon stage efficiency is studied. According to the above experiments and achieved results, it can be concluded that in general, an increase in impeller speed and solvent amount results in an increase in extraction efficiency. Also, when hold-up of the dispersed phase decreases, the stage efficiency usually increases up to a certain point.