Ethanol/Water Biomass Feedstock Separation Through Inorganic A-Type Zeolite Membrane on Thin Porous Ni Sheet Support

  • Type:
    Conference Presentation
  • Conference Type:
    AIChE Annual Meeting
  • Presentation Date:
    October 17, 2011
  • Duration:
    30 minutes
  • Skill Level:
  • PDHs:

Share This Post:

Bio-Ethanol/water separation by fractional distillation becomes a popular industrial process to remove water from ethanol-water mixture. However, the mixture of 95.6wt% ethanol and 4.4 wt% water is an azeotrope and cannot be further purified by distillation. Alternatively, this can be achieved by membrane separation technology since it is not works on vapor-liquid equilibrium but on pervaporation mode.

In this work, real ethanol feeds (rectifier bottom, 40 wt%, PH=3.99 and rectifier overhead, 95wt%, PH=4.54) from Pacific Ethanol Inc. were chosen to test the performance and stability of A type zeolite membrane (2~3um), which supported on novel thin porous Ni sheet substrate (~50um). The preliminary results shows that NaA zeolite membrane was unstable at operation condition (~100C), mainly due to the strong acidity of real ethanol-water biomass feedstock (PH≈4).

However, after neutralized with 0.1M NaOH solution to PH=8.5 or by pass a guard bed filled with weak base ion exchange resin (Amberlite@IRA-93), this novel membrane shows high performance (Water flux >2 kg/m2 h, water/ethanol selectivity > 5000) and stability (>100hrs). ICP analysis result also shows that sodium and sulfur ions will remains in the feed side during the separation process, mainly due to their large hydrated diameter (~7.2 Å for Na+ and ~8.6 Å for SO42-) comparing with the pore size of NaA zeolite membrane. (~4Å)

Once the content has been viewed and you have attested to it, you will be able to download and print a certificate for PDH credits. If you have already viewed this content, please click here to login.



Do you already own this?



AIChE Member Credits 0.5
AIChE Members $15.00
AIChE Graduate Student Members Free
AIChE Undergraduate Student Members Free
Non-Members $25.00