Jurnal Rekayasa Proses
Vol 5, No 1 (2011)

Kinetika Reaksi Alkyd Resin Termodifikasi Minyak Jagung dengan Asam Phtalat Anhidrat

Heri Heriyanto (Unknown)
Rochmadi Rochmadi (Unknown)
Arief Budiman (Unknown)



Article Info

Publish Date
20 May 2013

Abstract

Reaksi esterifikasi anhidrida phtalat dengan monogliserida merupakan reaksi kondensasi membentuk polimer dengan rantai linier. Penelitian ini bertujuan untuk mempelajari kinetika reaksi alkid resin termodifikasi minyak jagung tanpa menggunakan katalis. Proses penelitian ada dua tahap yaitu tahap pertama reaksi alkoholisis dan tahap kedua reaksi esterifikasi. Tahap alkoholisis diawali dengan mereaksikan minyak jagung dan gliserol dengan perbandingan molar 1:2 pada suhu 250°C. Sampel diambil pada selang waktu 30 menit selama 3 jam untuk dianalisis kadar gliserol bebasnya dengan metode iodometri (FBI-AO2-03). Tahap esterifikasi adalah mencampurkan anhidrida phtalat ke dalam reaktor batch dengan perbandingan molar gliserol : anhidrida phtalat 3:2. Sampel dianalisis kadar gugus OH- dengan metode asetat anhidrida. Peubah-ubah yang dipelajari meliputi variasi suhu dari 230°C – 260°C dan variasi perbandingan ekivalen OH/COOH dari 1 – 1,25. Berdasarkan hasil penelitian diambil kesimpulan bahwa minyak jagung dan gliserol dapat dialkoholisis tanpa menggunakan katalis pada kisaran suhu 230°C – 260°C. Pengaruh suhu terhadap konstanta kecepatan reaksi dinyatakan dengan persamaan Arrhenius adalah sebagai berikut : k1=1,4647×104 exp (-8237,7/T) (g/mgek.men) k4=2,1398×109 exp (-14142/T) (g/mgek.men) Kata kunci: alkoholisis, esterifikasi, minyak jagung, gliserol, anhidrida phtalat Esterification of phthalic anhydrate with monoglyceride is a condensation reaction to form a linear chain polymer. The present work aimed at investigating reaction kinetics of alkyd resin modified with corn oil in the absence of catalyst. The work consisted of two steps i.e. alcoholysis and esterification. In the alcoholysis step, corn oil and glycerol were brought into reaction with a molar ratio of 1:2 at 250°C. Every 30 minutes during 3 hour reaction, reaction products were sampled to analyse the remaining free glycerol by iodometry method (FBI-AO2-03). In the esterification step, phthalic anhydrate was put in the batch reactor with a glycerol-phthalic anhydrate molar of 3:2. Samples were taken and the hydroxyl ions were analysed by acetate anhydrate method. The variables investigated in the present work were reaction temperatures varied from 230°C to 260°C and equivalent OH/COOH ratio from 1 to 1.25. Experimental results showed that alcoholysis of corn oil and glycerol could be carried out in a temperature range of 230°C to 260°C without the presence of catalyst. The effect of temperature on the reaction rate constant of monoglyceride and phthalic ester formation could be respectively written in the Arrhenius correlations as follows: k1 = 1.4647.104 exp (-8237.7/T) g/mgeq.min k4 = 2.1398.109 exp (-14142/T) g/mgeq.min Keywords: alcoholysis, esterification, corn oil, glycerol, phthalic anhydrate

Copyrights © 2011






Journal Info

Abbrev

jrekpros

Publisher

Subject

Education Social Sciences

Description

Jurnal Rekayasa Proses (J. Rek. Pros) is an open-access journal published by Chemical Engineering Department, Faculty of Engineering, Universitas Gadjah Mada as scientific journal to accommodate current topics related to chemical and biochemical process exploration and optimization which covers ...