NOVELTY - Solar driven soxhlet extractor comprises a collecting vessel (1) placed at the focus of solar parabolic dish concentrator (2) helping thus to draw solar thermal energy at the desired temperature to effect the extraction process; and placing the above vessel in a black coated insulating box (3) covering the four sides to enhance the thermal efficiency of the process by minimizing the effect of convective heat loss due to wind.    USE - The solar driven soxhlet extractor is used for extracting non-polar lipids from dry micro-algal biomass to improve the energy output to input ratio (claimed).    ADVANTAGE - The extract lipids from sun dried microalgal biomass are used with low boiling solvents using solar thermal energy. The non-polar low boiling solvents such as hexane are used to extract out only those lipids that are particularly suitable for biodiesel while leaving unsuitable materials behind. Such solvent extraction preferably with Soxhlet extractor ensures complete extraction with minimum solvent. The extractor is used to recover the lipids free of solvent at the end of the extraction process employing solar thermal distillation. Cold water is passed through the reflux condenser to minimize solvent loss and by using a solar PV based chiller. After the extraction process, the biomass contains residual solvent, thus subjecting the biomass directly to solar heating to strip off and recover the residual solvent.    DETAILED DESCRIPTION - Solar driven soxhlet extractor comprises (i) a collecting vessel (1) placed at the focus of solar parabolic dish concentrator (2) helping thus to draw solar thermal energy at the desired temperature to effect the extraction process; (ii) placing the above vessel in a black coated insulating box (3) covering the four sides to enhance the thermal efficiency of the process by minimizing the effect of convective heat loss due to wind; (iii) placing the extraction column (4) containing the biomass thimbles over the vessel; (iv) placing the condenser (5) being connected to a chiller (6); (v) connecting chiller to the battery (7) being connected to solar photovoltaic (PV) panel (8); (vi) placing an absorber tube (10) at the focus of the solar parabolic trough (9), thus using solar energy to strip off the solvent embedded in the biomass collected in the collecting vessel (12) attached to the condenser (11) and connected to the above the chiller (6). An INDEPENDENT CLAIM is a process for extracting non-polar lipids from dry micro-algal biomass to improve the energy output to input ratio using solar driven soxhlet extractor and the process comprises (a) conducting solvent extraction in a conventional Soxhlet apparatus placed at the focus of a solar parabolic dish concentrator; (b) using solar refrigeration techniques to chill the condenser to minimize solvent losses; (c) placing spent biomass wet with 15-30% w/w solvent in the absorber tube of a parabolic trough concentrator and stripping off the adhering solvent; (d) as in the case of (b) above, using a chilling facility to minimize evaporation losses; (e) subjecting the solvent extract to solar thermal distillation to isolate the solvent-free non-polar lipids for further processing into biodiesel as per known prior art; (f) as in the case of (a) and (d) above, using a chilling facility to minimize evaporation losses; PV modules or and drawing its thermal energy from the solar radiation Sun drying of the harvested microalgae biomass for removal of excess moisture; (g) extracting non-polar lipids with low boiling point solvents using solar parabolic concentrators for heating the collecting vessel of Soxhlet apparatus; and (h) distilling the low boiling point solvents using solar parabolic concentrators for heating the collecting vessel of Soxhlet apparatus.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of a solar driven soxhlet extractor.    Collecting vessel (1, 12)    Dish concentrator (2)    Insulating box (3)    Extraction column (4)    Condenser (5, 11)    Chiller (6)    Battery (7)    Solar PV panel (8)    Solar parabolic trough (9)    Absorber tube (10)