Permeability and Diffusion Coefficients of Single Methyl Lactate Enantiomers in Nafion® and Cellophane Membranes Measured in Diffusion Cell.

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F16%3A00454686" target="_blank" >RIV/61389013:_____/16:00454686 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985858:_____/16:00454686

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.seppur.2015.12.026" target="_blank" >http://dx.doi.org/10.1016/j.seppur.2015.12.026</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.seppur.2015.12.026" target="_blank" >10.1016/j.seppur.2015.12.026</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Permeability and Diffusion Coefficients of Single Methyl Lactate Enantiomers in Nafion® and Cellophane Membranes Measured in Diffusion Cell.

Popis výsledku v původním jazyce

A two-compartment horizontal diffusion cell of own construction was used to measure the permeability and diffusion coefficients for the test system toluene in low density polyethylene (LDPE) and for chiral d- and l-methyl lactates in Nafion® and cellophane. The solvent was chosen such that it was not absorbed in the membrane. The evaluation process was developed to include the accumulation of the solute in the membrane or the change in the membrane thickness. There is a significant difference between the transport and sorption of methyl lactates in Nafion® and cellophane, respectively. The methyl lactate enantiomers show a comparable relative difference (50% approximately) in the case of the mass sorption and permeability coefficient values in Nafion® and therefore very similar values of diffusion coefficients, but a tenfold higher permeability coefficient of one enantiomer in comparison with the second one in cellophane while sorption coefficient is, again, different by 50% approximately in this case resulting in fifteenfold higher diffusion coefficient of one enantiomer. Furthermore, there is an opposite difference between the mass sorption and swelling of the membrane in the case of methyl lactate enantiomers in Nafion®: d-methyl lactate shows a higher mass sorption but lower areal swelling compared with the results of l-methyl lactate in Nafion® in the case of dilute solutions. A possible explanation for this fact is that d-methyl lactate fits like a puzzle piece into Nafion’s secondary or primary structure and that l-methyl lactate molecules cause more extensive stretching of polymer backbones due to specific force actions. Despite of the observed chiral membrane properties, chiral resolution of racemic mixture of methyl lactates was not reached.

Název v anglickém jazyce

Permeability and Diffusion Coefficients of Single Methyl Lactate Enantiomers in Nafion® and Cellophane Membranes Measured in Diffusion Cell.

Popis výsledku anglicky

A two-compartment horizontal diffusion cell of own construction was used to measure the permeability and diffusion coefficients for the test system toluene in low density polyethylene (LDPE) and for chiral d- and l-methyl lactates in Nafion® and cellophane. The solvent was chosen such that it was not absorbed in the membrane. The evaluation process was developed to include the accumulation of the solute in the membrane or the change in the membrane thickness. There is a significant difference between the transport and sorption of methyl lactates in Nafion® and cellophane, respectively. The methyl lactate enantiomers show a comparable relative difference (50% approximately) in the case of the mass sorption and permeability coefficient values in Nafion® and therefore very similar values of diffusion coefficients, but a tenfold higher permeability coefficient of one enantiomer in comparison with the second one in cellophane while sorption coefficient is, again, different by 50% approximately in this case resulting in fifteenfold higher diffusion coefficient of one enantiomer. Furthermore, there is an opposite difference between the mass sorption and swelling of the membrane in the case of methyl lactate enantiomers in Nafion®: d-methyl lactate shows a higher mass sorption but lower areal swelling compared with the results of l-methyl lactate in Nafion® in the case of dilute solutions. A possible explanation for this fact is that d-methyl lactate fits like a puzzle piece into Nafion’s secondary or primary structure and that l-methyl lactate molecules cause more extensive stretching of polymer backbones due to specific force actions. Despite of the observed chiral membrane properties, chiral resolution of racemic mixture of methyl lactates was not reached.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20402 - Chemical process engineering

Projekt

<a href="/cs/project/GAP106%2F12%2F0569" target="_blank" >GAP106/12/0569: Membránové separace - efektivnější separace čistých enantiomerů z racemických směsí</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Separation and Purification Technology

ISSN

1383-5866

e-ISSN

—

Svazek periodika

158

Číslo periodika v rámci svazku

JAN 28

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

11

Strana od-do

322-332

Kód UT WoS článku

000369461700039

EID výsledku v databázi Scopus

2-s2.0-84951962451