Malaysian Journal of Analytical Sciences Vol 20 No 6 (2016): 1481 - 1490

DOI: http://dx.doi.org/10.17576/mjas-2016-2006-29

 

 

 

POLYIMIDE MEMBRANES FOR ORGANIC SALTS RECOVERY FROM MODEL BIOMASS FERMENTATION

 

(Membran Poliimida untuk Pengumpulan Garam Organik daripada Model Sup Penapaian Biojisim)

 

Nadiah Khairul Zaman, Rosiah Rohani*, Abdul Wahab Mohammad

 

Department of Chemical and Process Engineering,

Faculty of Engineering and Built Environment,

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

 

*Corresponding author: rosiah@ukm.edu.my

 

 

Received: 21 October 2015; Accepted: 14 June 2016

 

 

Abstract

Succinic acid displays promising properties as a precursor for synthesizing valuable chemicals. However, its recovery experiences difficulty due to the formation of by-products with similar physicochemical properties, namely acetate and formate. The succinate separation process via pressure filtration membrane technology demonstrates polyimide (PI) membrane as a potential candidate due to its high resistance and selectivity to many organic solvents from its imide groups, an important feature in separation of biomass fermentation broth. This study aims to investigate the performance of newly synthesized PI (P84) membrane prepared by phase inversion for succinate recovery from fermentation broth (simulated model solution is used). PI polymer composition 14 – 17 wt% were cast to investigate the effect of varying polymer compositions on the performance of NF membrane determined from the recovery of succinate, and removal of formate and acetate from ternary organic salt solutions at concentration range between 10 – 50 g/L. PI membrane (15 wt%) shows the highest selective succinate retention of 73%. Succinate selective retention was observed to increase whereas rejection of by-products decreased at increasing mixed salt solution concentration from 20 – 50 g/L. Field Emission Scanning Electron Microscope (FESEM) results showed a PI membrane with dense and thick top layer, with porous middle substructure to support membrane performance.

 

Keywords:  polyimide, nanofiltration membrane, succinate, biomass fermentation, mixed salt solution

 

Abstrak

Asid suksinik mempunyai kepentingan sebagai pelopor dalam mensintesis bahan kimia yang bernilai. Namun, pengumpulannya menghadapi kesukaran kerana pembentukan satu lagi produk sampingan yang mempunyai sifat fizikokimia yang sama seperti asetat dan format. Dalam proses pemisahan/pengumpulan suksinat menerusi tekanan teknologi membran penapisan, membran poliimida (PI) didapati berpotensi sebagai calon membran kerana ia bersifat perintang yang tinggi kepada banyak pelarut organik dan juga mempunyai pemilihan yang tinggi ke atas air melalui kumpulan imida yang penting dalam pengasingan sup penapaian biojisim. Oleh itu, kajian ini bertujuan untuk menyiasat prestasi membran PI (P84) yang baru disintesis dan disediakan dengan teknik fasa songsangan dalam bidang pengumpulan suksinat dari sup penapaian (model simulasi digunakan). Kepekatan PI polimer sebanyak 14 – 17 wt% telah disediakan dan kesan kepekatan polimer dalam penyediaan membran PI telah disiasat untuk mencapai membran PI berprestasi tinggi yang ditentukan dari pengumpulan suksinat dan penyingkiran asetat dan format pada julat kepekatan antara 10 – 50 g/L. Melalui kajian ini, membran PI (15 wt%) menunjukkan pengumpulan suksinat tertinggi sebanyak 73%. Pengumpulan suksinat diperhatikan meningkat manakala penyingkiran produk sampingan berkurangan dengan peningkatan kepekatan garam campuran dari 20 – 50 g/L. FESEM yang menunjukkan lapisan atas membran PI yang padat dan tebal serta lapisan substruktur tengah yang berliang untuk menyokong prestasi membran PI.

 

Kata kunci:  poliimida, nanopenurasan, suksinat, penapaian biojisim, garam campuran

 

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