CD Tesis

Kajian Model Kinetika Gliserolisis Asam Stearat Menggunakan Katalis Nades (Natural Deep Eutectic Solvents) Dari Kolin Klorida Dan Sorbitol

---

Due to the increasing demand for mono- and diglycerides (MDG) as
emulsifier in food industries has led to further research on their kinetic studies in
order to investigate for more efficient process prior to energy consumption as well
as producing high conversion and MDG product purities. Conventional MDG
production by glycerolysis of fatty acids can be carried out in the presence of
homogenous acid catalysts (such as H2SO4 and HCl) or basic catalysts (such as
KOH and NaOH). However, these catalysts had led to inefficient process and
environmental problems. In order to overcome this, the use of green catalyst such
as DES (deep eutectic solvents) for this process is preferable due to their less
toxicity, cheap raw materials, non-volatile, easy separation, excellent reusability
as well as produce relatively high conversion. Furthermore, type of DES that
consist of hydrogen bonding acceptor (HBA) and hydrogen bonding donor (HBD)
of less toxic compounds is known as NADES (natural deep eutectic solvents).
The aims of this study are to investigate the catalytic activity of NADES
(choline chloride and sorbitol) in glycerolysis of stearic acid and validate its
kinetic modelling. Catalyst concentration (5 wt%) and agitation speed (300 rpm)
were kept constant. The variation of temperatures (120⁰ C, 150⁰ C and 180⁰ C)
and molar ratios of stearic acid to glycerol (1:2, 1:4 and 1:6) were carried out to
determine the optimum conditions as well as to determine the mechanism of this
reaction using NADES as catalyst.
The studied reaction showed that stearic acid conversions were linearly
increased as increasing temperatures. At all variation of molar ratios and
temperatures, the FTIR spectra showed identical peaks of alcohol, ester and
carboxylic acid groups confirming the presence of ester glycerol products.
Accordingly, optimum condition with highest conversion of 97,76% were achieved
at molar ratio of 1:6, temperature of 180⁰C and 180 minutes reaction time. FTIR
spectra also confirmed this high conversion values by the absence peak at 941 cm-
1 wavenumbers, indicating the stearic acid were succesfully converted. Reaction
kinetic data at molar ratio of 1:6 and temperature of 180⁰C were successfully
fitted to a pseudo second order with the highest value of R2=0.9822, mean error
of 1.72% and sum square of error (SSE) values of 0,01. The calculated rate
constants at molar ratio of 1:6 resulting the activation energy and Arrhenius
constant (A) were 64.04 kJ/mol and 1969696 L.mol-1/min, respectively.
Key Words : Catalyst, Glycerolysis Of Fatty Acid, Kinetic Study, Monoglyceride,
NADES

---

Ketersediaan

Informasi Detail

Judul Seri

-

No. Panggil

2010247394

Penerbit

Pekanbaru : Universitas Riau – Pascasarjana – Tesis Teknik Kimia., 2022

Deskripsi Fisik

-

Bahasa

Indonesia

ISBN/ISSN

-

Klasifikasi

2010247394

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

TEKNIK KIMIA

Info Detail Spesifik

-

Pernyataan Tanggungjawab

FATAH

Versi lain/terkait

Lampiran Berkas

Komentar

---

Anda harus masuk sebelum memberikan komentar