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. 2024 Dec 18;16(24):3530.
doi: 10.3390/polym16243530.

Effect of Side Substituent on Comb-like Polysiloxane Membrane Pervaporation Properties During Recovery of Alcohols C2-C4 from Water

Evgenia Grushevenko  1 , Islam Chechenov  1 , Tatyana Rokhmanka  1 , Tatiana Anokhina  1 , Stepan Bazhenov  1 , Ilya Borisov  1   2
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Effect of Side Substituent on Comb-like Polysiloxane Membrane Pervaporation Properties During Recovery of Alcohols C2-C4 from Water

Evgenia Grushevenko et al. Polymers (Basel). .

Abstract

The pervaporation properties of membranes based on comb-like polysiloxanes when C2-C4 alcohols are removed from water were studied for the first time. It was established that membranes based on comb-like polysiloxanes with linear aliphatic and organosilicon substituents have increased permeability selectivity for C3+ alcohols. The obtained results were interpreted from the point of view of the solubility of the components of the separated mixture in polysiloxanes. It was shown that membranes based on polysiloxanes with linear substituents have increased butanol/water permeability selectivity (2.5-3.7). The achieved selectivity values correspond to the level of highly selective zeolite membranes, which allows for a reduction in energy consumption for the pervaporation removal of butanol by more than two times.

Keywords: alcohol recovery; comb-like polysiloxane; pervaporation; polymeric membrane; water treatment.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
The scheme of the reaction for obtaining polymethylsiloxanes substituted by a side group. n—polymerization degree of initial PMHS, x—monomer units entering into a cross-linking reaction.
Figure 2
Figure 2
Layout of the vacuum pervaporation installation [19].
Figure 3
Figure 3
SEM images of a polysiloxane membrane on a stainless-steel mesh: (a) top view, (b) bottom view, (c) cross-section.
Figure 4
Figure 4
(a) The dependence of the component fluxes on the type of side substituent (BuOH—1-butanol; PrOH—1-propanol; EtOH—ethanol). (b) the dependence of the water flux on the type of side substituent. (c) The dependence of the alcohol–water separation factor on the type of side substituent (BuOH—1-butanol; PrOH—1-propanol; EtOH—ethanol; W—water).
Figure 5
Figure 5
The dependence of the values of the permeability coefficients on the type of side substituent. (BuOH—1-butanol; PrOH—1-propanol; EtOH—ethanol; W—water (a). The dependence of the alcohol–water selectivity values on the type of side substituent. (BuOH—1-butanol; PrOH—1-propanol; EtOH—ethanol; W—water (b).
Figure 6
Figure 6
The dependence of the values of the water and butanol solubility on the type of side substituent (a,b). The dependence of the butanol–water solubility selectivity values on the type of side substituent (c).
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