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Different Separation Technologies

separation

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#1 hysyshunter

hysyshunter

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Posted 27 February 2024 - 10:24 AM

HI everyone,

 

I was hoping i could get some help on different industrial separation technologies or techniques that can be used to separate glycerol from a mixture of propylene glycol the mixture is around 140C and a pressure of 45kPa and the mixture is about 60% PG, 40% Glycerol.

 

 Anything would help, thanks :)

 



#2 latexman

latexman

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Posted 27 February 2024 - 10:34 AM   Best Answer

Certainly! Separating glycerol from a mixture of propylene glycol (PG) can be achieved using various industrial separation techniques. Here are some methods you can consider:

  • Distillation:
    • Distillation is a common technique for separating components based on their boiling points. Since glycerol and propylene glycol have different boiling points, you can use fractional distillation to separate them.
    • At the given temperature of 140°C and pressure of 45 kPa, you can set up a distillation column. The mixture will vaporize, and the components will condense at different heights in the column. Collect the fractions separately.
  • Liquid-Liquid Extraction (LLE):
    • LLE involves using a solvent to selectively extract one component from a mixture. In your case, you can choose a solvent that preferentially dissolves glycerol.
    • Mix the mixture with the solvent, allow them to separate into two layers, and then collect the glycerol-rich layer.
  • Membrane Filtration:
    • Membrane filtration techniques, such as ultrafiltration or nanofiltration, can separate components based on their molecular size.
    • Use a membrane with appropriate pore size to allow glycerol to pass through while retaining propylene glycol.
  • Crystallization:
    • If glycerol and propylene glycol form different types of crystals, you can cool the mixture to induce crystallization.
    • Separate the crystals, which will be enriched in either glycerol or propylene glycol.
  • Adsorption:
    • Adsorption processes involve using solid materials (adsorbents) to selectively adsorb one component from a mixture.
    • Choose an adsorbent that has a higher affinity for glycerol. The mixture passes through the adsorbent bed, and glycerol gets adsorbed.
  • Fractional Precipitation:
    • Adjust the temperature of the mixture to selectively precipitate either glycerol or propylene glycol.
    • Collect the precipitate, which will be enriched in the desired component.

Remember to consider factors such as cost, efficiency, and scalability when choosing the most suitable method for your specific industrial application. Additionally, consult with experts or conduct lab-scale experiments to optimize the separation process.

 

Courtesy of MS Bing Copilot.






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