Concentrators (also known as nitrogen evaporators or nitrogen blowdown concentrators) are a viable alternative to rotary evaporation when tiny volumes (less than 50 mL) and a large number of samples are required.
Concentrators speed up the evaporation process by lowering the partial vapour pressure of the solvent just above the liquid’s surface. Blowdown evaporators use a jet of gas to constantly blast vapor-saturated air out of the way. By eliminating molecules as soon as they enter the vapour state, they don’t have a chance to return to the liquid state, which speeds up evaporation. As previously stated, the blowdown technique
Because nitrogen blowdown takes longer with bigger samples and semi-volatile chemicals may be lost, this method is best for small sample quantities. The evaporation is increased even more since the samples are immersed in a water bath with programmed temperatures up to 100°C. LabTech offers four variants, three of which are automated and one of which is manual, each with a variety of tube sizes to meet a variety of applications.