Dehydration of Organic Solvents by Evaporation through Membranes Based on Polyelectrolytic Complexes

Kuznetsov, Yu. P.; Kruchinina, E. V.; Nud'ga, L. A.; Петрова, В. А.; Bochek, A. M.; Shishkina, G. V.; Matveeva, N. M.

doi:10.1023/b:rjac.0000018689.37655.57

Cited by 5 publications

(3 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table 2 shows the results of pervaporation separation of aqueous-ethanol solutions of various compositions. In separating the concentrated solution of ethanol, all the CAM membranes studied demonstrate dehydrating properties, even though the maximal a H 2 O = 10.2 is considerably lower than that of the known highly selective membranes used for dehydration [10,11]. The tendency of a H 2 O to decrease in this series from 10.2 to 1.5 correlates with the increase in the hydrophobicity of the corresponding CAM membranes.…”

Section: Methodsmentioning

confidence: 81%

“…This is favored by the effect of diffusion mass transfer, i.e., by smaller kinetic diameter of the water molecules. From the practical standpoint, there is a wide spectrum of polymers and membranes on their basis [11,17,18] demonstrating strongly different affinity for water and ethanol, with the difference being considerably larger compared to dehydrating 290/10 CAM membrane ( Table 2) and also to cellulose diacetate membrane [19].…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Transport properties of cellulose ester membranes for separating gas and liquid mixtures

et al. 2004

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Methodsmentioning

confidence: 81%

Section: Methodsmentioning

confidence: 99%

Transport properties of cellulose ester membranes for separating gas and liquid mixtures

et al. 2004

Self Cite

View full text Add to dashboard Cite

show abstract

“…These methods can reduce the thickness of the effective PEC layer, while significantly improving the mechanical strength of the membrane. The formation of multilayer membranes of this type has been described in the literature [5,6]; however, a significantly large number of layer-by-layer depositions of anionic/cationic polyelectrolytes are often required to achieve high membrane selectivity. This is especially the case when the substrate membrane is microporous [7], as the presence of open pores on the membrane surface creates membrane defects that give rise to non-selectivity.…”

Section: Introductionmentioning

confidence: 99%

Two-Ply Composite Membranes with Separation Layers from Chitosan and Sulfoethylcellulose on a Microporous Support Based on Poly(diphenylsulfone-N-phenylphthalimide)

et al. 2017

View full text Add to dashboard Cite

Two-ply composite membranes with separation layers from chitosan and sulfoethylcellulose were developed on a microporous support based on poly(diphenylsulfone-N-phenylphthalimide) and investigated by use of X-ray diffraction and scanning electron microscopy methods. The pervaporation properties of the membranes were studied for the separation of aqueous alcohol (ethanol, propan-2-ol) mixtures of different compositions. When the mixtures to be separated consist of less than 15 wt % water in propan-2-ol, the membranes composed of polyelectrolytes with the same molar fraction of ionogenic groups (-NH3+ for chitosan and -SO3− for sulfoethylcellulose) show high permselectivity (the water content in the permeate was 100%). Factors affecting the structure of a non-porous layer of the polyelectrolyte complex formed on the substrate surface and the contribution of that complex to changes in the transport properties of membranes are discussed. The results indicate significant prospects for the use of chitosan and sulfoethylcellulose for the formation of highly selective pervaporation membranes.

show abstract

Separation of Ethylene Glycol/Water Mixtures using NaA Zeolite Membranes

Nik

Moheb

Mohammadi

2006

Chem. Eng. Technol.

View full text Add to dashboard Cite

Inorganic membranes and particularly zeolite membranes are usually used for the dehydration of organic solvents by pervaporation (PV). This work reports an experimental study on the PV dehydration of ethylene glycol (EG)/water mixtures using commercial nanoporous NaA zeolite membranes. The concentration range investigated (C EG > 70 wt %) was selected according to existing industrial requirements. The recirculation flow rate was kept at a value of 1.5 L/min. The fluxes and separation factors were monitored as the dehydration proceeded. In addition, the activation energy of permeation (E a ) was calculated. The effect of temperature was investigated in the range 50-70°C. The results obtained demonstrated the successful performance of the membrane for the dehydration of EG/ water mixtures. It was observed that at 70°C and with 70 wt % initial EG concentration, larger fluxes and separation factors could be obtained, i.e., 0.94 kg m -2 h -1 and 1177, respectively. The Pervaporation Separation Index (PSI) of the membrane was found to be high compared to that of polymeric membranes.

show abstract

Dehydration of Organic Solvents by Evaporation through Membranes Based on Polyelectrolytic Complexes

Cited by 5 publications

References 8 publications

Transport properties of cellulose ester membranes for separating gas and liquid mixtures

Transport properties of cellulose ester membranes for separating gas and liquid mixtures

Two-Ply Composite Membranes with Separation Layers from Chitosan and Sulfoethylcellulose on a Microporous Support Based on Poly(diphenylsulfone-N-phenylphthalimide)

Separation of Ethylene Glycol/Water Mixtures using NaA Zeolite Membranes

Contact Info

Product

Resources

About