Introduction to Evaporators

Introduction to Evaporators

Introduction to Solvent Evaporators:

The Series S-EVAP^TM are compact bench-top size instruments for concentrating large volumes of solvent in round flasks or Kuderna-Danish flasks. They find use in environmental and other analysis where it is necessary to concentrate extracted materials from liquid or solid samples. This is accomplished by boiling the solvent in a heated water bath. Waste solvent is collected for further purification and reuse or for disposal. The process is fast and solvent loss is minimal

Introduction to Nitrogen Evaporators:

The Series N-EVAP'" and MULTIVAP'" analytical evaporators are time saving and convenient instruments for preparing samples for liquid chromatography, gas chromatography and mass spectometry. They find use in applications where it is necessary to concentrate multiple samples in order to analyze the residue. This is accomplished by the proven technique of blowing Nitrogen onto the surface of a heated sample. The result is a fast and controlled operation.

Features:

6 models will handle 5 to 8 samples at one time.
Flask sizes from 125 ml to 1000 ml
Thermostatically controlled water bath provides heat.
Shallow bath for round flasks or deep bath for the Kuderna-Danish flasks.
Solvent-recovery hardware is standard on all units.
Complete systems are bench-top size and can be operated in an exhaust hood or a properly ventilated laboratory.

Features:

6 models will handle 6 to 100 samples at one time.
Holds test tubes, vials, Erlenmeyer's, centrifuge tubes.
Uses Nitrogen or air as the evaporative agent.
Thermostatically controlled water bath provides heat.
Low Nitrogen consumption of 330ml/min/sample.
19-gauge needles standard, other sizes optional.
All units will fit and are recommended to be used in a bench-top, ventilated hood.

**Evaporation Rates:**
Solvent Name	Boiling Point	Bath Temp.	Rate ml/min	Time min/200ml
Methylene Chloride	40º C	90º C	20ml	11min
Hexane	69° C	95º C	12ml	17min
Freon	48° C	88º C	18ml	11min
Pentane	36° C	85º C	22ml	9min
Acetone	56° C	92º C	17ml	12min

**Evaporation Rates:**
Solvent Name	Boiling Point	Bath Temp.	Rate ml/min	Time min/200ml
Methylene Chloride	40º C	37º C	.4ml	25min
Hexane	69° C	67º C	.36ml	28min
Freon	48° C	45º C	.48ml	21min
Pentane	36° C	32º C	.42ml	24min
methanol	65° C	63° C	.25ml	40min
Acetone	56° C	37º C	.35ml	28min

The bath temperature is set 30° to 50°C above the solvent boiling point. This overcomes the insulating effect of the glassware and heat losses above the bath and at the condenser.Condensers are cooled to 10° C with individual collection flasks installed. The ratio of recovered solvent to starting solvent averages 97%.

The bath temperature is set approximately 2° to 4° C below the solvent boiling point. The Nitrogen flow is 330ml/position/minute. Needles are 4-inch long by 19 gauge. Higher evaporation rates can be achieved by increasing the Nitrogen flow rate and using larger diameter 16 or 14-gauge needles.

**How to Choose Organomation Evaporators**
Volume Concentration The S-EVAP solvent evaporators concentrate 50 to 1000 ml of solvent after an extraction process has been performed. It is ideal for Methylene Chloride, Hexane and other organic solvents used in environmental or industrial analysis. For oil and grease analysis requiring evaporation to dryness, round flasks and a shallow bath are used. For organic residue analysis and 1 to 3 ml endpoint. Kuderna-Danish flasks, insulated concentrator tubes and a deep bath are used. Solvent collection is standard on all models Choose a 5 or 8 position unit,depending on your sample quantities.	Multiple samples The MULTIVAP Nitrogen evaporators concentrate 1 to 50 ml of solvent in test tubes or small flasks. Each group of 49 or 100 samples is batch processed in a removable rack. Starting and ending volumes are the same for all samples. MULTIVAPs find use in pharmaceutical science, medical testing and general research.
Individual Samples The N-EVAP Nitrogen evaporators concentrate 1 to 50 ml of solvent in test tubes or small flasks. Each sample is installed individually intoa spring-loaded sample holder. Three models feature 12, 24 and 36 positions. They are used in a wide variety of applications including environmental, medical, general research and education. Water bathsor dry baths provide heat.	Corrosive Environments N-EVAP and MULTIVAP instruments can be ordered with acid resistant coatings and parts to protect against damage from acid vapors.
Intrinsically Safe Baths When an electrical bath is used for concentrating volatile solvents, there is a risk that the vapors will enter the bath case and be ignited. Organomation baths can be modified with a type Z-purge option (as specified by National Fire Protection Association) that makes the bath intrinsically safe. The case is sealed against leakage and a tube fitting, filter and pressure gauge are attached. Positive pressure of 1 inch water is applied to the case to purge it and then maintained at .l inch water to insure that vapors remain outside the case. The option is inexpensive and is recommended whenever highly flammable solvents are present.