Papers by Author: Napida Hinchiranan

Abstract: This work aimed to prepare the bio-oil with low oxygen content via two-step process involving pyrolysis and catalytic deoxygenation. The raw bio-oil was produced from the pyrolysis of oil palm shell in a screw pyrolyzer with a heating rate of 25°C/min. Then, 10 ml of obtained bio-oil with 54.5 % (w/w) of oxygen content was upgraded by catalytic deoxygenation carried out in a fixed-bed reactor containing 20 g of NiMoS/-Al2O3 catalyst under nitrogen atmosphere. When the temperature in the reactor reached to the target point, the bio-oil was dropped by using a syringe pump at a constant flow rate of 0.2 ml/min. The results indicated that this process was efficient to reduce the oxygen content in the bio-oil to 11.5% (w/w) when the reaction temperature was 500°C

Abstract: The graft copolymerization is one chemical modification methods to improve natural rubber (NR)’s properties via both solution and latex phases. To enhance the polarity of NR, methyl methacrylate (MMA) was applied for graft copolymerization of NR in the presence of thermal or redox initiators. However, the conventional graft copolymerization generally spends long reaction time (ca. 6-8 h). Due to less energy consumption with faster heating rate, the microwave irradiation was used to induce graft copolmerization of MMA onto NR latex using redox initiation system. By comparing with the conventional grafting method at the same grafting properties, the graft copolymerization of MMA onto NR induced by microwave at 100 W spent the shorter reaction time ca. 15 min; whilst, the conventional method required the longer reaction time as 7 h. The influence of microwave power on the grafting properties was investigated. The structure of graft product was also analyzed by using FTIR and 1H NMR spectroscopy.