Search results
Results from the WOW.Com Content Network
A rotary evaporator [1] (rotovap) is a device used in chemical laboratories for the efficient and gentle removal of solvents from samples by evaporation.When referenced in the chemistry research literature, description of the use of this technique and equipment may include the phrase "rotary evaporator", though use is often rather signaled by other language (e.g., "the sample was evaporated ...
After many cycles the desired compound is concentrated in the distillation flask. The advantage of this system is that instead of many portions of warm solvent being passed through the sample, just one batch of solvent is recycled. After extraction the solvent is removed, typically by means of a rotary evaporator, yielding the extracted ...
Rotary evaporators are now being used in more and more laboratory kitchens as well. [8] The relationship between the pressure and vapor temperature of a selection of solvents should be considered when distilling. [9] The temperature difference between the vapor temperature and cooling medium should be at 20C to result in sufficient condensation.
Rotary evaporators use a vacuum pump to create a low pressure over a solvent while simultaneously rotating the liquid flask to increase surface area and decrease bubble size. Typically, the vapor is passed over a cold finger or coil so that the vaporized material does not damage the pump.
Organic solvent or salt Temp (°C) Dry ice p-xylene +13 Dry ice Dioxane +12 Dry ice Cyclohexane +6 Dry ice Benzene +5 Dry ice Formamide +2 Ice Salts (see: left) 0 to −40 Liquid N 2: Cycloheptane −12 Dry ice Benzyl alcohol −15 Dry ice Tetrachloroethylene −22 Dry ice Carbon tetrachloride −23 Dry ice 1,3-Dichlorobenzene −25 Dry ice o ...
Centrifugal evaporator patent from 1875. A centrifugal evaporator is a device used in chemical and biochemical laboratories for the efficient and gentle evaporation of solvents from many samples at the same time, and samples contained in microtitre plates. If only one sample required evaporation then a rotary evaporator is most often
Nearly three-quarters of Americans drink coffee every day — and now a new study suggests that brewing it at a certain time of day could percolate some health benefits. Health experts provide ...
The rate of evaporation in an open system is related to the vapor pressure found in a closed system. If a liquid is heated, when the vapor pressure reaches the ambient pressure the liquid will boil. The ability for a molecule of a liquid to evaporate is based largely on the amount of kinetic energy an individual particle may possess. Even at ...