کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
628833 1455497 2006 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Chitosan-poly (vinyl alcohol)/poly (acrylonitrile) (CS–PVA/PAN) composite pervaporation membranes for the separation of ethanol–water solutions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Chitosan-poly (vinyl alcohol)/poly (acrylonitrile) (CS–PVA/PAN) composite pervaporation membranes for the separation of ethanol–water solutions
چکیده انگلیسی

Pervaporation (PV) membranes made of a chitosan (CS) homogeneous membrane, poly (vinyl alcohol)-poly (acrylonitrile) (PVA–PAN) and chitosan-poly (vinyl alcohol)/poly (acrylonitrile) (CS–PVA/PAN) composite membranes for the separation of ethanol–water solutions were manufactured. The swelling behaviors of CS homogeneous membranes and CS–PVA/PAN composite membranes were measured. Effects of membrane thickness, CS–PVA concentrations in the coating solution, PVA concentrations in the CS–PVA blend polymer, ethanol concentrations in the feed solutions and feed solution temperatures on pervaporation performance for the ethanol–water mixtures are discussed. The experimental results showed that the separation factor (α) of CS–PVA/PAN composite membranes increased with an increase of PVA concentration in the CS–PVA blend polymer from 0 to 40 wt%. With an increase in the membrane thickness from 12 to 18 μm, the separation factor (α) of the CS–PVA/PAN composite membrane increased while permeation flux (J) decreased. With an increase of ethanol–water solution temperature, the separation factor (α) of CS membranes decreased and the permeation flux (J) of CS membrane increased while for the PVA–PAN and CS–PVA/PAN composite membranes they increased. The apparent activation energy (ΔEa) of water for CS membranes was 34.3–59.5KJ/mol and less than that of ethanol with 39.4–71.4 KJ/mol. The apparent activation energy (ΔEa) of water for both PVA–PAN and CS–PVA/PAN membranes was twice as high as that of ethanol. The ΔEa of water and ethanol for PVA/PAN and CS–PVA/PAN membranes was 13.6–61.6 KJ/mol, 3.3–15.1 KJ/mol, 41.0–60.6 KJ/mol, and 20.9–31.3 KJ/mol, respectively.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 193, Issues 1–3, 10 May 2006, Pages 171-181