©  Copyright 2013 Chemical Engineering & Gas Processing Extraction Procedure  The Randall Hot Extraction Procedure  This section presents technological advances made in  extraction of algae oil. The  algae can be extract using different  solvents according to Randall Hot Extraction Procedure.  The Randall Hot Extraction Procedure consists of three steps,  Decocting, rinsing and evaporation.  1. Decocting During the first step, the extraction thimble containing the  sample is immersed in the boiling solvent in the beaker - just  like a tea bag in a cup of hot water. Much of the algae that are  to be extracted will already dissolve during this step, and  disperse in the solvent.  The upper part of the apparatus just works as a reflux  condenser; the reflux will drip into the thimble, thus helping to  dissolve the algae.  2. Rinsing In the second step, the extraction thimble is lifted out of the  beaker. It still contains some adhering extract; and it might still  contain some algae that have not yet been dissolved. Now the  reflux from the condenser will rinse the adhering extract and  also, given time, dissolve the parts of the algae that are yet  undissolved.  3. Evaporation In order to evaporate the solvent, the reflux stopcock closes  below the condenser. Now the condensate will gather in the  lower part of the condenser; we can use it again for the next  extraction. Due to the short distances in the apparatus, it is  possible to evaporate the sample almost to dryness.    References: • http://www.behr-labor.com/indexeng.html • Rahmanpour O., Ajami H., Shariati A., Helaleh A.H., Comparison of different solvents used in nanochloropsis algae oil extraction., Journal of Biodiversity and Environmental Sciences., Vol. 5, No. 5, p. 234-240, 2014