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Continuous Liquid/liquid Extraction

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#1 AndyChemEng


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Posted 07 February 2020 - 09:57 AM

Hi all,


We currently operate a batch liquid/liquid extraction process that consists of 5 individual extractions.

This process uses several large and expensive reactor units that could be better utilised in a different process.


I am interested in replacing two of the these vessels by introducing a continuous liquid/liquid extraction unit.


I am currently carrying out a review of the available technology and was wondering if people could share their expertise/experience and/or provide some advice?


Mixer-settlers / centrifugal extractors etc



#2 AndyChemEng


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Posted 03 October 2020 - 02:26 PM



I'm looking at Sulzer, specifically the Kunhi agitated columns, or Rousselet Robatels (monocentrifugal extraction)  for developing our continuous extraction unit and was wondering if anyone had experience either of them or the technology they employ?

Pros / cons?


Much appreciated.


#3 breizh


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Posted 03 October 2020 - 07:21 PM




Consider the link above .


How many LLE stages do you need ?  


Good luck . 



#4 AndyChemEng


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Posted 11 February 2021 - 03:33 PM

Hi Breizh,


Thank you for the info. I'm looking at a 7 stage system (subject to pilot plant optimisation) and I'm going to go with an agitated cell design.



#5 RonC74


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Posted 03 March 2021 - 09:33 AM

I've designed and operated a continuous liquid-liquid extraction process.

My design included a recovery system for the solvent as well. 

This is a simple application that you can easily verify in a lab scale design.

I do not believe there is a really need to pay hard $ for Sulzer design, unless you have a really special application or you are lacking engineering power. 

I can give you some advices, if you want to go this way.


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