How can we permeate organic compound from bulk liquid? Is there any organic compound permeation membrane?

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Lian Cheng Wang

You may consider ultrafiltration membranes. It depends on what molecules to separate.

Kamran Ayaz

lianchengweng@ actually i want to pass citrate and acetate through membrane from bulk liquid. so it can be filtrate through membrane in to other container. its a kind of permeation. What you think ?

Alan Gabelman

Have you considered electrodialysis?

Alan Gabelman that is really good article thanks for that. but i think it will not work in my reactor. so i don't know what kind of membrane will help me

Amirhossein Farahi

Dear Kamran Ayaz

I think PDMS composite membrane in pervaporation process can help you. In the composite membranes for organic compound separation and ethanol separation from liquid in pervaporation process, the polydimethylsiloxane (PDMS) is one of the most interesting membranes that has been extensively studied as selective layer in pervaporation process.

I recommend you to study attached papers which may help you.

- S.S. Shahrabi, H. Mortaheb, J. Barzin, M. Ehsani, Pervaporative performance of a PDMS/blended PES composite membrane for removal of toluene from water, Desalination, 287 (2012) 281-289.

-M. Osorio-Galindo, A. Iborra-Clar, I. Alcaina-Miranda, A. Ribes-Greus, Characterization of poly (dimethylsiloxane(-poly (methyl hydrogen siloxane( composite membranes for organic water pervaporation separation, Journalof applied polymer science, 81 (2001) 546-556.

-L. Liang, E. Ruckenstein, Pervaporation of ethanol-water mixtures through polydimethylsiloxane-polystyrene interpenetrating polymer network supported membranes, Journal of membrane science, 114 (1996) 227-234.

-T. Kashiwagi, K. Okabe, K. Okita, Separation of ethanol from ethanol/water mixtures by plasma-polymerized membranes from silicone compounds, Journal of Membrane Science, 36 (1988) 353-362.

-J. Guo, G. Zhang, W. Wu, S. Ji, Z. Qin, Z. Liu, Dynamically formed inner skin hollow fiber polydimethylsiloxane/polysulfone composite membrane for alcohol permselective pervaporation, Chemical Engineering Journal, 158 (2010) 558-565.

For example Gao used PDMS/PS membrane to separate water and alcohol (8 wt%) in pervaporation process. Salehi Shahrabi et al. used polyethersulfone membranes (PES) with various additives including PVP and PEG as support layers in composite PDMS membranes. The effect of support layers on the water/ toluene separation process was investigated.

Best Regards

The molecular weights of citrate and acetate are not high. They might permeate out from the bulk liquid. However, selection of membranes depends also on the properties and molecular weight of stuff in the bulk phase. In addition, these two substances are organic acid, so the possibility of corrosion to the surface materials of the membrane must be considered.

I'm not sure why you think ED will not work. Maybe I don't fully understand what you're trying to do. What is the composition of your starting material, and what exactly do you want to separate?