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Mungkalodom P.,Petroleum and Petrochemical College | Paradee N.,Petroleum and Petrochemical College | Sirivat A.,Petroleum and Petrochemical College | Hormnirun P.,Kasetsart University
Materials Research | Year: 2015

Poly(2,5-dimethoxyaniline) (PDMA) was synthesized using electrochemical polymerization of DMA in oxalic acid. The PDMA film coated onto ITO glass was studied for its chemical structure, morphology, electro-deposition, and electro-activity by FT-IR, TGA, SEM, cyclic voltammetry, and UV-Vis spectrophotometry. The PDMA film showed reversible color changes from yellow to blue representing the transition between the fully reduced state to the fully oxidized state upon switching the potentials. The response time of the PDMA film in term of color change was investigated under various applied potentials and different types of acid electrolyte (HCl and H2SO4). The fast response time of less than 2 sec was observed at the applied potential of 1.6 V. In comparison with HCl, the use of H2SO4 as an electrolyte resulted in the fastest response time. Thus, the PDMA is a potential candidate in electrochromic devices due to its reversible color change and fast response time.

Chaitanarit A.,Petroleum and Petrochemical College | Wungtanagorn C.,Thaioil Public Company Ltd | Jitkarnka S.,Petroleum and Petrochemical College
AIChE 2012 - 2012 AIChE Annual Meeting, Conference Proceedings | Year: 2012

In recent years, with the global warming problem and the energy crisis, the production of chemicals from renewable resources has been paid more attention. Light olefins (ethylene and propylene); one of the important chemicals, can be produced from renewable resources as well. Recently, there are few reports on the production of ethylene from bio-ethanol; that is a renewable resource, using a silicoaluminophosphate zeolite (SAPO-34) catalyst through the catalytic dehydration process. The suitable temperature for the highest production of ethylene is 350°C, after which it decrease. However, the selectivity to propylene at high reaction temperatures and low space velocity had not yet been investigated. In this work, the objective was to study the effect of using SAPO-34 in the catalytic conversion of bio-ethanol to light olefins at various operating conditions aiming to find the optimal condition for the high propylene production. The reaction temperature and liquid hourly space velocity (LHSV) were varied in the range of 350°C to 500°C and 0.2 h-1 to 1.0 h-1, respectively. As a result, the reaction temperature and LHSV had the influences on catalytic activity. Low temperature or high LHSV are highly effective for the production of ethylene whereas high temperature or low LHSV are highly effective for the production of C4+ products. The reaction temperature of 400°C and the LHSV of 0.5 h-1 were found to be the suitable conditions for a high production of propylene with 92.5% ethanol conversion and 12.6% propylene selectivity. The reaction temperature and the LHSV also affected to the coke formation on the catalyst. The amount of coke increased with the increase of reaction temperature and the decrease of LHSV.

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