rotary evaporator

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(Chem.) a device used in laboratories in which a liquid is evaporated by reducing the pressure and applying heat, while rotating the liquid in a vessel such as a round-bottomed flask. The reduced pressure speeds the evaporation process and allows the evaporation to be conducted at temperatures lower than would otgherwise be possible, thus reducing decomposition of unstable substances. The rotation also serves to increase the surface area from which evaporation takes place and to reduce the effect of "bumping", the sudden burst of vaporization that can scatter liquid exposed to reduced pressure.

See also: Evaporator

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The supernatant was collected, evaporated to remove ethyl alcohol using a vacuum rotavap (RE-52AA, Shanghai Qingpu Huxi Instrument, China), and then diluted to 50 mL with distilled water to give the sample extract solution.
To stop the back reaction, excess of alcohol is evaporated off by rotavap. Residue is extracted with diethyl ether.
The resulting eluent was then moved to a flat bottom Florence flask (Corning, 4060-250), using the triple DCM rinsing technique, and rotary evaporated (Rotavap Buchi Laboratory Equipment) until all excess DCM was removed.
Briefly, 80% methanol was mixed with ground GBR (4 : 1, solvent-to-GBR ratio) and incubated for 2 h in a sonicator (extraction was performed three times), and the resultant supernatants evaporated to dryness (Buchi R-210 rotary evaporator, Rotavap).
1 filter paper and then evaporated to dryness under vacuum using rotary evaporator (BUCHI Rotavap or R-114) at 40 degC to form a crude extract.
The process of simple distillation was performed in the recovery of acetone with the aid of a rotary evaporator or rotavap (TE-210-Tecnal), which enabled the separation of the liquid (acetone) from the nonvolatile substances (residues).
The reaction mixture was retiuxed under stirring for about 3 h, after which the solvents were removed in rotavap. The product was successively washed with chloroform and water and dried.
The solvent was removed on a rotavap and the solid washed with water to give compound 3 (yield 98%), m.p.
The samples were concentrated under vacuum (Rotavap).