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Sains Malaysiana 47(9)(2018): 2073–2082 http://dx.doi.org/10.17576/jsm-2018-4709-15
Penghidrogenan Getah Asli Cecair menggunakan Sistem Mangkin Selenium (Hydrogenation of Liquid Natural Rubber using Selenium-Catalyzed
System) NUR AIDASYAKIRAH
MOHD
TAHIR1,
MOHAMAD
SHAHRUL
FIZREE
IDRIS1,
MUHAMMAD
JEFRI
MOHD
YUSOF1
& SITI FAIRUS M. YUSOFF1,2* 1Pusat Pengajian Sains Kimia dan Teknologi Makanan,
Fakulti Sains
dan Teknologi, Universiti Kebangsaan Malaysia,
43600 UKM Bangi, Selangor Darul
Ehsan, Malaysia 2Polymer Research Centre
(PORCE), Fakulti Sains
dan Teknologi,
Universiti Kebangsaan Malaysia,
43600 UKM Bangi, Selangor Darul
Ehsan, Malaysia Diserahkan: 27 Mac 2018/Diterima: 17 Mei 2018 ABSTRAK Kaedah rangsangan permukaan
(RSM)
dengan reka
bentuk komposit putaran tengah (CCRD)
telah digunakan
untuk mengoptimumkan parameter bagi penghidrogenan getah asli cecair
(LNR)
dalam sistem
hidrazin hidrat (HH)
dan hidrogen peroksida
(H2O2) dengan
kehadiran selenium sebagai
mangkin. Parameter
yang dikaji bagi
tindak balas ini
adalah nisbah
mol HH:LNR (1.25-2.25),
nisbah mol H2O2:LNR
(1.25-2.25), suhu (40-80°C)
dan masa tindak balas (4-8 jam). Berdasarkan data
yang diperoleh, penghasilan
getah asli cecair terhidrogen (HLNR)
sesuai dijelaskan
dengan model kuadratik. Model kuadratik ini
mempunyai nilai
pekali penentuan (R2)
sebanyak 0.9596 yang menunjukkan
korelasi yang tinggi
antara peratus penghidrogenan sebenar dengan peratus yang telah diramalkan. Berdasarkan plot permukaan tindak balas 3D, suhu tindak balas
memainkan peranan
penting dalam penghidrogenan
LNR.
Keadaan optimum yang diperoleh
melalui RSM bagi
kajian ini adalah nisbah mol
HH:LNR
pada 1.50, nisbah
mol H2O2:LNR
pada 2.00, suhu tindak balas pada
53.34°C dengan masa tindak
balas selama 5.21 jam yang memberikan peratusan penghidrogenan HLNR sebanyak
68.98%. Persamaan polinomial kuadratik
yang diperoleh daripada
RSM
ini berguna untuk
menghasilkan HLNR dengan
peratusan penghidrogenan
yang dikehendaki. Kata kunci: Getah asli
cecair (LNR); kaedah
rangsangan permukaan
(RSM);
penghidrogenan; reka
bentuk komposit putaran tengah (CCRD);
selenium ABSTRACT Response surface methodology
(RSM) with central composite rotatable design (CCRD)
was used to optimize the hydrogenation parameters of liquid natural
rubber (LNR)
in hydrazine hydrate (HH) and hydrogen peroxide (H2O2)
system in the presence of selenium as catalyst. The parameters studied
in this research were the mole ratio of HH:LNR (1.25-2.25),
mole ratio of H2O2:LNR
(1.25-2.25), reaction temperature (40-80°C) and reaction
time (4-8 h). Based on the data obtained, hydrogenation of LNR fit the quadratic model. This quadratic
model had the determination coefficient (R2)
of 0.9596 that showed high correlation between the actual hydrogenation
percentages and the predicted percentages. Based on the 3D surface
plot, the reaction temperature played an important role in the hydrogenation
of LNR.
The optimum conditions for hydrogenation of LNR in
hydrazine hydrate/hydrogen peroxide system in the presence of selenium
catalyst were as follows: mole ratio of HH:LNR of
1.50, mole ratio of H2O2:LNR
of 2.00, reaction temperature of 53.34°C and reaction
time of 5.21 h that yielded 68.98% of hydrogenated product. Quadratic
polynomial equation that was obtained from RSM is useful in preparing HLNR with
desired hydrogenation percentages. Keywords: Central composite rotatable design (CCRD);
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