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rotary evaporator




+32 1658 9045


0032 (0)16 41 44 07

+32 1650 9045


Av. de l' Armée 68

B-1040 Brussels



tel 01 43 25 01 50

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9, rue Lagrange

75005 Paris


tel 02 36 00 65 93

fax 02 36 00 65 94

20135 Milano


tel +32 1658 9045

fax +32 1650 9045


Tel 058 710 33 44

Fax 00 32 16 50 90 45

ul. Grunwaldzka 88A/2

81-771 Sopot


tel +81 78 386 0860

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Jumbo Rotary – A brief Introduction of evolution of CYLINDRICAL SHAPED Rotary Film Evaporator made of Borosilicate Glass!! -  a ALL NEW Innovation


UPTO 800 Ltr – The largest in the WORLD !!


Rotary Film Evaporator is a very regular usage product in the R & D of chemical & pharmaceutical industry. It is also being used nowadays for manufacturing purpose for high value pharmaceutical & specialty chemical products. The existing rotary film evaporators, which are used, are with spherical evaporating flasks. What happens is when the requirement of volume for process increases it is practically very difficult to go beyond the size of 50 Liters.


Chemical reactors are cylindrical in shape with a particular L/D ratio in general, which are given for a particular reaction surface area. The cylindrical vessel has a higher surface area than spherical vessel. This prompted us to think in the direction; why only spherical vessel is used when we can exploit the advantage of cylindrical shape evaporation flask in a rotary film evaporator.


Fortunately, we came across US based clients who were looking for higher capacity rotary film evaporator made with Borosilicate 3.3 glass. After a lot of consideration we devised a cylindrical rotary film evaporator prototype of 20 Liter capacities. Tests & trials were carried on the prototype with the client & the results were extremely encouraging.


Thus the innovation for a better rotary film evaporator with better efficiency in terms of rate of evaporation was done. The results showed that the rate of evaporation was enhanced to 20 % as compared to conventional spherical shaped rotary film evaporator. Also the mechanical stability was far superior to spherical vessel, inclined drive rotary film evaporator.


Then we designed the largest Rotary Film Evaporator – Jumbo Rotary, capacity 400 Ltrs made from Borosilicate Glass 3.3 Cylindrical Evaporation flask. In spherical flask rotary film evaporator the drive is inclined and the flask is held from it’s neck only. Thus a inclined cantilever type of loading happens on the rotating assembly. This is highly unstable mechanically as for the same neck size of flask, higher stresses develop in the flask neck compared to a horizontal drive simply supported flask as in the case of cylindrical rotary film evaporator. The cylindrical flask of the jumbo rotary evaporator is also held by the neck, but the drive centerline is not inclined, instead it is horizontal. The rotating flask is also supported axially at two cross-sectional circumference over it’s whole length, thus making the loading effectively a simply supported one and not a cantilever type. This reduces the stresses on the neck of the flask and is the only safer solution for making higher size rotary film evaporator. Another advantage of the cylindrical flask is it’s lower diameter compared to a spherical flask for a particular volume, which is a very critical factor for glass MOC as the pressure rating goes down drastically with the increase in diameter. Also material removal & cleaning becomes easier from the cylindrical rotary film evaporator. It is simply opening the quick release coupling from one end. The material can be easily scooped out where as in spherical rotary film evaporator the whole flask is to be separated out &  spherical flasks becomes too bulky and handling becomes very difficult for sizes above 100 Ltrs.     


The testing & trials of this Jumbo Rotary also gave similar enhanced results (as in the 20 Ltr Prototype) in terms of its increased rate of evaporation, as the cylindrical shape, has a larger surface area compared to spherical vessel for the same volume.


This development has overcome the constraint of the size in Rotary Film Evaporators from laboratory scale applications to industrial applications for sizes 100 Ltrs & above.


Copyright © 2002 GENTAUR Molecular Products
Last modified: 05/29/09