Recycling blowing agent (having solvent) from Nutsche filters. 1

[luciom]

In blowing the filter cake in our Nutsche filter with nitrogen significant quantities of solvent (Isopropanol)
are lost. Is there an established technology whereby both the gas & solvent can be recycled ?

 

[butelja]

If your pressure is < 15 PSI, you could theoretically use a roots type positive displacement blower to recirculate the N2 throught the filter. The knockout pot between the filter and blower would need to be a vacuum rated pressure vessel. You may also neet a heat exchanger on the blower discharge to remove the heat of compression, as these type of blowers are roughly 50-60% efficient. If you cool the blower discharge enough (chiller?), you may need another pressure vessel for the condensed and reclaimed solvent.

A major impediment to success would likely be diatomaceous earth (filter aid) carryover into the blower. Due to its abrasive action, the blower life would be short if carryover is significant.

 

[mike4168]

It is very possible that my company can help you. It just happens that we are installing a piece of equipment that incorporates a nutsche filter and solvent recovery along with a fluidbed dryer. We would love to discuss your application in a more secure manner. Please contact Russell Husfeld or Alan Nix at 1-800-228-3217.
Also, visit our website:

http://www.appliedchemical.com

 

[MortenA]

Solvent recovery must be faily common for this type of application.

Best Regards

Morten