Comparison of Pervaporation and Perstraction for the Separation of p-xylene/m-xylene Mixtures Using PDMS and CTA Membranes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F21%3A43921917" target="_blank" >RIV/60461373:22310/21:43921917 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22340/21:43921917

Výsledek na webu

<a href="https://doi.org/10.1016/j.seppur.2021.118986" target="_blank" >https://doi.org/10.1016/j.seppur.2021.118986</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.seppur.2021.118986" target="_blank" >10.1016/j.seppur.2021.118986</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Comparison of Pervaporation and Perstraction for the Separation of p-xylene/m-xylene Mixtures Using PDMS and CTA Membranes

Popis výsledku v původním jazyce

The separation of the individual xylene isomers remains challenging and energy intensive. Since the utilization of membrane separations could bring an improvement, we compare the efficacy of two related membrane methods, pervaporation and perstraction, for the separation of p‑xylene/m‑xylene mixtures using membranes from polydimethylsiloxane (PDMS) and cellulose triacetate (CTA) at 40 °C. Methanol was used as the receiving liquid in perstraction and as a membrane entrainer; feeds containing 0–80 mol.% of methanol were studied. While PDMS showed almost no selectivity to p‑xylene over m‑xylene during pervaporation, the selectivity reached up to 1.40 when operated in the perstraction mode with the feed enriched with methanol. CTA performed better than PDMS for all studied mixtures, the highest selectivity of 1.93 was observed for the perstraction of the molten eutectic mixture with no methanol in the feed. The likely reason for the enhancement of the selectivity are the isomer-specific interactions with the polar moieties in the polymer plasticized by methanol. Overall, it was demonstrated that a simple change in the mode of operation from pervaporation to perstraction and the use of a membrane entrainer can appreciably enhance the p‑xylene to m‑xylene selectivity of the common and reliable membrane materials.

Název v anglickém jazyce

Comparison of Pervaporation and Perstraction for the Separation of p-xylene/m-xylene Mixtures Using PDMS and CTA Membranes

Popis výsledku anglicky

The separation of the individual xylene isomers remains challenging and energy intensive. Since the utilization of membrane separations could bring an improvement, we compare the efficacy of two related membrane methods, pervaporation and perstraction, for the separation of p‑xylene/m‑xylene mixtures using membranes from polydimethylsiloxane (PDMS) and cellulose triacetate (CTA) at 40 °C. Methanol was used as the receiving liquid in perstraction and as a membrane entrainer; feeds containing 0–80 mol.% of methanol were studied. While PDMS showed almost no selectivity to p‑xylene over m‑xylene during pervaporation, the selectivity reached up to 1.40 when operated in the perstraction mode with the feed enriched with methanol. CTA performed better than PDMS for all studied mixtures, the highest selectivity of 1.93 was observed for the perstraction of the molten eutectic mixture with no methanol in the feed. The likely reason for the enhancement of the selectivity are the isomer-specific interactions with the polar moieties in the polymer plasticized by methanol. Overall, it was demonstrated that a simple change in the mode of operation from pervaporation to perstraction and the use of a membrane entrainer can appreciably enhance the p‑xylene to m‑xylene selectivity of the common and reliable membrane materials.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10404 - Polymer science

Projekt

<a href="/cs/project/GA18-08389S" target="_blank" >GA18-08389S: Studium plastifikace polymerních membrán a termodynamiky multikomponentní sorpce pro zefektivnění membránových separačních procesů</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

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

274

Číslo periodika v rámci svazku

1 November 2021

Stát vydavatele periodika

BE - Belgické království

Počet stran výsledku

11

Strana od-do

118986

Kód UT WoS článku

000668937600009

EID výsledku v databázi Scopus

2-s2.0-85107147799