Sains Malaysiana 41(10)(2012): 1239–1244

 

Synthesis and Characterization of Esters Derived from Ricinoleic Acid and  Evaluation of their Low Temperature Property

(Sintesis dan Pencirian Terbitan Ester daripada Asid Risinoleik dan Penilaian Sifat Suhu Rendah)

 

Jumat Salimon* & Nadia Salih

School of Chemical Sciences and Food Technology, Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600 Bangi Selangor D.E., Malaysia

 

Emad Yousif

Department of Chemistry, College of Science, Al-Nahrain University

Baghdad, Iraq

 

Received: 13 February 2012 / Accepted: 19 June 2012

 

 

ABSTRACT

A series of ester compounds derived from ricinoleic acid to be used as biolubricants base stock have been synthesized. The resulting products were confirmed by FTIR and NMR analyses. The synthesis was carried out in three stages: epoxidation of ricinoleic acid; synthesis of 10,12-dihydroxy-9-acyloxystearic acid from epoxidized ricinoleic acid with various fatty acids and esterification of the acyloxystearic acid products with octanol to yield octyl-10,12-dihydroxy-9-acyloxystearate. The viscosities, flash points and pour points (PP) behavior of the products were measured. The resulting esters had an increased in molar weight and viscosity and decreased in pour points as compared to ricinoleic acid.

 

Keywords: Biolubricants; chemical modification; epoxidation; ricinoleic acid

 

ABSTRAK

Suatu siri sebatian ester terbitan asid risinoleik untuk kegunaan minyak asas biolubrikan telah disediakan. Produk terhasil dikenal pasti melalui analisis FTIR dan NMR. Sintesis telah dilakukan melalui tiga langkah: pengepoksidaan asid risinoleik; sintesis 10,12-dihidroksi-9-asiloksistearik dari asid risinoleik terepoksida dengan pelbagai asid lemak dan pengesteran asiloksistearik dengan oktanol untuk menghasilkan oktil-10,12-dihidroksi-9-asiloksistearat. Nilai kelikatan, takat kilat dan takat tuang produk yang terhasil telah ditentukan. Hasil kajian mendapati bahawa produk ester yang terhasil menunjukkan peningkatan dalam berat molekul dan nilai kelikatan serta penurunan dalam nilai takat tuang berbanding dengan asid risinoleik.

 

Kata kunci: Asid risinoleik; biolubrikan; pengepoksidaan; modifikasi kimia

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*Corresponding author; email: jumat@ukm.my