Kinetika Reaksi Sintesis Karboksi Metil Glukomanan

Rahmawati Andayani, Santi Tri Wijayanti, Fadilah fadilah


Cultivation of porang plants now has a promising prospect because it has a high
economic value. Glucomannan content in porang is quite high (15-64% dry base).
Glucomannan, the natural polymers contained in porang corms, can be modified by
carboxymethylation. The synthesis of carboxy methyl glucomannan took place over two
steps, alkalization and carboxymethylation. Alkalization was conduct using NaOH in
ethanol 70% as the medium. The carboxymethylation steps was conducted by adding
sodium chloroacetate as the reagent. The quality of carboxy methyl glucomannan was
determined from its Degree of Substitution (DS). The results showed that the highest
degree of substitution was 0.47 with 70% ethanol as medium and at temperature 65
C for
150 minutes reaction time. From the data obtained, it can be seen that the reaction of
glucomannan carboxymethylation proceeded at 1
order reaction, with the collision factor
value (A) of 491.227 J/mol.K and its activation energy (Ea) of 30,994.59 J/mol.K.

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