answering to StoneCold:
I always recommend to condense under vacuum (with chilled water if necessary) and before the vacuum pump - reducing (dramatically) the size of the vacuum pump. An after-condenser (at atm. pressure) make sense in addition of a pre-condenser (under vacuum) for a solvent...
Ejector or vacuum pump? Eventually the best choice will be an “hybrid system”: a multistage system comprising a pre-condenser (always the most economical equipment to handle vapours) and then 1 – 3 ejector stages and a liquid ring vacuum pump as a last stage. The vacuum ejectors have many...
you will find many vacuum condenser manufacturers:
http://www.vacuum-guide.com/vacuum-pump/vacuum-ejector/vacuum-condenser-europe.htm
(most of them manufacture vacuum ejectors)
Mjpetrag,
Distillation as per your original idea is the best method to separate Methanol and water,
with Pervaporation we can separate, Water out of other solvents, or Methanol out of other solvents, but not water out of MeOH.
Hope it helps,
Anne
Formz,
also GEA have published curves and charts for a rough sizing:
http://www.niro.com/nuk/cmsresources.nsf/filenames/dvp1.pdf/$file/dvp1.pdf
and more manufacturers are listed in vacuum-guide:
http://www.vacuum-guide.com/vacuum_pump/vacuum_ejector/vacuum_ejector_america.htm
Hope it...
Smartiron,
This is a typival application for an hybrid system:
Distillation up to 80% Isopropanol
+ Vapour permeation (isothermal pervaporation in a vapour phase) from 80 to 99.5%
Suppliers in membrane-guide.com...
Glenfiddich,
the key rules are:
1. never run the pump dry
2. do not start the pump over-flooded with water.
If you are running "once-thru" (without any recirculation of the seal liquid) then just open the seal liquid supply (solenoid valve) simultaneously with the vacuum pump / compressor...
i found adresses in vacuum-guide.com,
equipment manufacturers: http://www.vacuum-guide.com/vacuum_coating/equipment/vacuum_coating_america.htm
and experts:
http://www.vacuum-guide.com/vacuum_coating/services/vacuum_coating_services_america.htm
hope it helps
you will find a list of liquid ring vacuum pump manufacturers in www.vacuum-guide.com,
pls, try: http://www.vacuum-guide.com/vacuum_pump/liquid_ring/liquid_ring_vacuum_pump_america.htm
tell us pls. the application, size of the pump, control range (0-100% of the volumic suction capacity is normally not required), we will size a control valve for you. Liquid ring vacuum pumps are easy to control with an air bleed but maybe you could also save energy with a frequency converter...
