Preparation and characterization of PLA polymeric membrane for pervaporation applications

مقدم أطروحة جامعية

Hashim, Abd al-Sattar

مشرف أطروحة جامعية

al-Salihi, Qays

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم الهندسة الكيمياوية

دولة الجامعة

العراق

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2012

الملخص الإنجليزي

Flat sheet membranes were prepared by phase inversion method.

The polymeric dope solution was prepared from 15% of poly lactic acid (PLA) as a natural source polymer in the ethyl lactate as solvent.

The non-solvent water was used as the coagulation bath.

Several characterization tests were performed as well, The morphology (SEM image), thickness, contact angle, mechanical properties and degree of swelling were investigated with different coagulation bath temperatures (CBT)(20°c, 40°c, 60°c, 80°c) and different evaporation time (ET) (0.5 min, 1 min, 3 min, 5 min, 7 min).

The membranes were changed from finger-like structure to spongy-like structure with different coagulation bath temperatures and with evaporation time, the structure changed from finger-like structure to spongy-like structure to dense-like structure.

There is a small decrease in the thickness from 0.198 to 0.144mm of membrane with coagulation bath and from 0.174 to o.042 mm with evaporation time.

Mechanical properties improved by increasing the coagulation bath temperature and evaporation time.

The successful use of ME5 membrane at 7 min as evaporation time in pervaporation separation of MEOH/MTBE azeotropric mixture was demonstrated.

Where, The total flux was found to increase with the increase in the feed temperature from 0.0388 to 0.208 kg/m²hr for PLA membrane and selectivity reached over 75.

partial flux for methanol increases from 0.03 to 0.171kg/m²hr and partial flux for MTBE increases from 0.0062 to 0.036 kg/m²hr.

In addition, by increasing the permeate pressure the total flux and partial fluxes decreases.

While the selectivity increases.

Composite membrane (PLA/PVA) to separation water/EtOH was demonstrated.

Where, increasing the feed temperature causes increase the total flux from from 0.9 to 7.07 kg/m²hr and selectivity reached to 6.33.

Partial flux for ethanol increases from 0.7 to 6.19 kg/m²hr and partial flux for water increases from 0.162 to 1.129 kg/m²hr.

Also by increasing the permeate pressure the total flux and partial fluxes decreases, While the selectivity increases.

التخصصات الرئيسية

العلوم الهندسية والتكنولوجية (متداخلة التخصصات)

الموضوعات

• البلاستيك المقوى

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-418568