Structural characteristics and state of water in an acetate cellulose membrane

Лазарев, С. И.; Golovin, Yu. M.; Kovalev, S. V.

doi:10.1134/s0040579516030076

Cited by 6 publications

(1 citation statement)

References 9 publications

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“…The membrane was fixed on a substrate (Whatman paper) so that the membrane did not have contact with metal surfaces, the active layer to the solution to be separated. The shared module was attached to the laboratory setup described in [33]. The amount of collected permeate was determined every 30 minutes.…”

Section: Experimental Studies Of the Hydrodynamic Permeability Of Uam-50 Uam-100 Membranesmentioning

confidence: 99%

Studies of the pore space of the UPM-K, UAM-50, UAM-100 composite ultrafiltration membrane

Лазарев

Ковалева

Хорохорина

et al. 2021

JAMT

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The development of methods for assessing the distribution of pores by radii (or diameters) and studying the microstructure of the surface of a membrane partition is an urgent task. The authors of the paper carried out experimental studies of the pore diameter distribution for the UPM-K ultrafiltration membrane, determined the porosity and hydrodynamic permeability of the UAM-50, UAM-100 membranes. The analysis of the experimental results showed that the UPM-K ultrafiltration membrane had an average pore diameter of 54 nm. The UAM-50 and UAM-100 membranes were characterized by an asymmetric structure (an active layer (dense) and a porous substrate), while the pores were 2.5–40 and 10–40 nm in size, respectively. The experiments on the study of the hydrodynamic permeability of UAM-50, UAM-100 ultrafiltration membranes when separating a solution of sodium lauryl sulfate showed that the kinetic response curves of the “membrane-solution” system were conventionally divided into two stages. The first stage of the process was faster and lasted only a few minutes. After 7.8 and 13.05 min, the hydrodynamic permeability decreased by ~ 27 %, 7 %, which was due to structural changes in the cellulose acetate layer under the action of mechanical load (transmembrane pressure). The second stage was slower – with a duration of ~ 33 and 60 min and a decrease in hydrodynamic permeability by 41 % and 11 %. Based on the analysis of the approximating function, the rate constants of the membrane separation of solutions and the empirical coefficients of the equation are found.

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Section: Experimental Studies Of the Hydrodynamic Permeability Of Uam-50 Uam-100 Membranesmentioning

confidence: 99%