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Material Nylon Admer tie layer EVOH LDPE Oxygen Permeability+ (cm³ (STP) cm / cm²-s-atm) 2.89 x 10-10 1.04 x 10-⁹ 9.26 x 10-13 2.23 x 10-8 †(STP) = 0° C, 1 atm for permeability are (cm³ cm/cm²-s-atm), whereby a given volume of permeant (cm³) s through a specified cross-sectional area of polymer (cm²) which is of a given thickness

Material Nylon Admer tie layer EVOH LDPE Oxygen Permeability+ (cm³ (STP) cm / cm²-s-atm) 2.89 x 10-10 1.04 x 10-⁹ 9.26 x 10-13 2.23 x 10-8 †(STP) = 0° C, 1 atm for permeability are (cm³ cm/cm²-s-atm), whereby a given volume of permeant (cm³) s through a specified cross-sectional area of polymer (cm²) which is of a given thickness

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Oxygen Permeability+ (cm³ (STP) cm / cm²-s-atm) 2.89 x 10-10 1.04 x 10-⁹ 9.26 x 10-¹3 2.23 x 10-8 †(STP) = 0° C, 1 atm Material Nylon Admer tie layer EVOH LDPE Units for permeability are (cm³ cm/cm² s atm), whereby a given volume of permeant (cm³) moves through a specified cross-sectional area of polymer (cm²), which is of a given thickness (cm), in a certain time interval (s) with a defined pressure driving force (atm) across that polymer thickness. See Coursepack Table B-11 for how to convert solubility values to units of mol/(m's'atm).
Transcribed Image Text:Oxygen Permeability+ (cm³ (STP) cm / cm²-s-atm) 2.89 x 10-10 1.04 x 10-⁹ 9.26 x 10-¹3 2.23 x 10-8 †(STP) = 0° C, 1 atm Material Nylon Admer tie layer EVOH LDPE Units for permeability are (cm³ cm/cm² s atm), whereby a given volume of permeant (cm³) moves through a specified cross-sectional area of polymer (cm²), which is of a given thickness (cm), in a certain time interval (s) with a defined pressure driving force (atm) across that polymer thickness. See Coursepack Table B-11 for how to convert solubility values to units of mol/(m's'atm).
Problem 4 Hospitals routinely use translucent, plastic bags to introduce water, salt, sugar, and drugs to patients intravenously. Some of the drugs are not stable in the presence of high oxygen levels, when exposed to light. Therefore, it is important that the IV bag have very low oxygen permeability. One such bag is made of a multilayered film that includes 5 different polymer layers. The layers include a Nylon outer layer (40 µm thick layer), Admer tie layer (10 µm), EVOH barrier layer (16 µm), a second Admer tie layer (10 µm), and LDPE layer (90 µm). The Nylon is added for mechanical strength, the EVOH for oxygen barrier properties, LDPE for material compatibility reasons, and tie layers to hold the other polymer layers together. Nylon is the outer layer exposed to air, LDPE is the material in contact with fluids in the IV bag, and the IV bag is initially devoid of oxygen. The permeabilites, solubilities and diffusivities for oxygen through the layers are given below (ignore any variation with temperature). Determine the initial molar flux of oxygen through the listed 5-layer film and compare that to the flux through a 3-layer film that only includes Nylon, Admer, and LDPE layers of similar thickness. Nylon Tie EVOH Tie LDPE
Transcribed Image Text:Problem 4 Hospitals routinely use translucent, plastic bags to introduce water, salt, sugar, and drugs to patients intravenously. Some of the drugs are not stable in the presence of high oxygen levels, when exposed to light. Therefore, it is important that the IV bag have very low oxygen permeability. One such bag is made of a multilayered film that includes 5 different polymer layers. The layers include a Nylon outer layer (40 µm thick layer), Admer tie layer (10 µm), EVOH barrier layer (16 µm), a second Admer tie layer (10 µm), and LDPE layer (90 µm). The Nylon is added for mechanical strength, the EVOH for oxygen barrier properties, LDPE for material compatibility reasons, and tie layers to hold the other polymer layers together. Nylon is the outer layer exposed to air, LDPE is the material in contact with fluids in the IV bag, and the IV bag is initially devoid of oxygen. The permeabilites, solubilities and diffusivities for oxygen through the layers are given below (ignore any variation with temperature). Determine the initial molar flux of oxygen through the listed 5-layer film and compare that to the flux through a 3-layer film that only includes Nylon, Admer, and LDPE layers of similar thickness. Nylon Tie EVOH Tie LDPE
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