Assawasaengrat, Pornsawan

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Assawasaengrat, Pornsawan
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Assawasaengrat, P.
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pornsawan.as@kmitl.ac.th

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    Dimethyl ether synthesis via methanol dehydration over diatomite catalyst modified using hydrochloric acid
    (2014-01-01)
    Pranee, Watcharakorn
    ;
    Assawasaengrat, Pornsawan
    ;
    Neramittagapong, Arthit
    ;
    Neramittagapong, Sutasinee
    The synthesis of dimethyl ether via methanol dehydration has been carried out over untreated-diatomite catalyst (DM) and hydrochloric acid modified treatment on diatomite catalyst (DMHC). The reactions were carried out in a fixed-bed reactor. The effects of hydrochloric acid modifications of diatomite on its catalytic performance were studied. The characterization such as XRD, SEM, FT-IR and FT-Raman had no deformation after HCl-modified treatment on catalysts. DMHC catalyst apparently gave the higher methanol conversion rate than DM due to the acidity while the selectivity of dimethyl ether from 250 to 350°C was slightly changed. The acidity was depended upon Al<sup>(IV)</sup> ions; nevertheless, both Al<sup>(V)</sup> and Al<sup>(VI)</sup> were affected and hence increasing the basic active sites. Not only was the competitively catalytic methanol dehydrogenation preferred with basic condition but also methanol-blocking water molecule interaction was the unwanted reaction. In this investigation, the chemical-bond arrangements of silicon and aluminium ions were proposed with solid MAS/NMR. The DMHC catalyst exhibited better DME yield than the DM catalyst, and it could be used as a selective catalyst for DME synthesis from methanol. © (2014) Trans Tech Publications, Switzerland.
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    Adsorption of Ammonia Nitrogen in Aqueous Solution Using Zeolite A
    (2019-10-25)
    Assawasaengrat, P.
    ;
    Rueangdechawiwat, R.
    The capacity of alternative adsorbents including rice straw, delignified rice straw and zeolite A for ammonia nitrogen removal from aqueous solution was investigated. The adsorption experiments were carried out in batch system with initial ammonia nitrogen concentration of 0.5 mg-N/l, 1000 ml ammonia nitrogen solution for 1 g of adsorbent. Experimental data indicated that rice straw and delignified rice straw cannot adsorb ammonia nitrogen. However, zeolite A provided rapidly adsorption capacity for ammonia nitrogen removal. The amount of ammonia nitrogen adsorbed by zeolite A was 0.256 mg/g at 1 minute after the experiment was initially conducted and slightly stable at 0.275 mg/g after 10 minutes. The adsorption experiments were carried out at 0.25, 0.5, 1.0, 2.0, 4.0, and 8.0 mg-N/l of ammonia nitrogen concentration. The results indicated that zeolite A had the adsorption capacity of 0.102, 0.294, 0.551, 1.153, 2.303, and 3.897 mg/g respectively at equilibrium time. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms. Based on R<sup>2</sup>, Freundlich model was more promising to represent the adsorption data than Langmuir model.
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    Adsorption of methylene blue using calcium oxide from chicken eggshell
    (2025-06-05)
    Unkaew, Woravarun
    ;
    Poka, Pinchaphat
    ;
    Clowutimon, Weerawat
    ;
    Assawasaengrat, Pornsawan
    The adsorption of methylene blue on calcium oxide synthesized from chicken eggshells was investigated as a method for wastewater purification. Calcium oxide adsorbent was prepared by calcining ground eggshells in a furnace at 900°C for 3 hours, resulting in a material with approximately 97% purity. Adsorption experiments were conducted in batch mode, using a 0.25g: 50 ml ratio of adsorbent to solution and maintaining a temperature of 35°C. The contact time and initial methylene blue concentration were varied between 0-480 minutes and 10-200 mg/L, respectively. Equilibrium was reached within 240 minutes, the adsorption isotherm can be modelled by Langmuir model with a maximum specific amount adsorbed of 27.03 mg/g.
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    Catalytic wet-air oxidation of aniline removal from synthetic wastewater
    (2014-01-01)
    Sriprom, Pongsert
    ;
    Assawasaengrat, Pornsawan
    ;
    Neramittagapong, Arthit
    ;
    Neramittagapong, Sutasinee
    Wet-air oxidation (WAO) and catalytic wet-air oxidation (CWAO) over CuO/Al<inf>2</inf>O<inf>3</inf> and NiO/Al<inf>2</inf>O<inf>3</inf> catalysts for aniline removal were investigated. The oxidation reaction was carried out in a 1000-ml high-pressure batch reactor. The temperatures of 160, 200 and 260°C and the pressures of 5 and 10 bars were generally applied for 120 min. CuO/Al<inf>2</inf>O<inf>3</inf> and NiO/Al<inf>2</inf>O<inf>3</inf> catalysts were prepared by impregnation method. It is found from the results that aniline was completely degraded at these conditions. However, aniline was converted into other organic carbons which remained in the solution. So COD was found in the solution after the reaction. It is seen from the results that 56% of COD was removed by WAO at 200°C and 10 bars for 120 min. The CWAO over CuO/Al<inf>2</inf>O<inf>3</inf> catalyst showed higher COD removal (76%) than NiO/Al<inf>2</inf>O<inf>3</inf> catalyst (60%). The types of metal oxide had an effect to the activity of COD removal; that is, CuO showed higher COD removal than NiO. The WAO and CWAO of COD removal in aniline solution were the first-order kinetic with the constant reaction rate and activation energy for CuO/Al<inf>2</inf>O<inf>3</inf> of 0.234 s<sup>-1</sup> and 11.772 kJ/mol, respectively. © (2014) Trans Tech Publications, Switzerland.
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    Varnish and Sludge Potential: Strategies for Successful Gas Turbine Oil Condition Monitoring
    (2023-01-01)
    Chokelarb, Wasan
    ;
    Assawasaengrat, Pornsawan
    ;
    Sriprom, Pongsert
    One growing concern in power plants nowadays is the presence of one of the lubricant degradation by-products that can affect the lubrication system, which is sludge and varnish. Membrane patch colorimetry (MPC) was performed to determine both soluble and insoluble varnish in used lubricating oil. The varnish potential index (SI-MPC) is the new guideline to evaluate the overall varnish and sludge formation, and it helps in detecting early signs of possible varnish and sludge problems in the system. Viscosity, FTIR, linear sweep voltammetry (LSV), total acid number, and particle count were also performed to monitor the correlation between varnish and sludge formation. The result shows that the early detection of soluble varnish (S-MPC, ΔE 13.0) before it transforms to insoluble varnish can help the power plant make an action plan before the varnish problem becomes worse (I-MPC, ΔE 68.5), and an increase in the varnish potential index also relates to the depletion of antioxidant additive (50.8%) and increased particle count (ISO 21/17/14) of the lubricant. Thus, proper monitoring of soluble varnish (S-MPC), insoluble varnish (I-MPC), and varnish potential index (SI-MPC) can improve the diagnostic and corrective actions for varnish problems in gas turbines.
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    Production of empty palm bunch biochar using microwave-assisted pyrolysis at low temperature
    (2021-09-15)
    Paikamnam, Atipong
    ;
    Clowutimon, Weerawat
    ;
    Chanpee, Sirayu
    ;
    Sriprom, Pongsert
    ;
    Assawasaengrat, Pornsawan
    In this study, the production of palm empty fruit bunch biochar using microwave-assisted pyrolysis at low temperature was investigated. The empty palm bunch composition was analyzed by proximate analysis. The parameters relating to the production, i.e. type of microwave absorber, microwave power, heating time and ratio of palm empty fruit bunch to initial amount of microwave absorber, were studied to determine the optimum condition. The results found that the amount of fixed carbon in the empty palm bunch was approximately 10%. The optimum condition was microwave power 300-watt, heating 450 sec and ratio of empty palm bunch to concentrated sulfuric acid (the most suitable microwave absorber) 1:2.5. At this condition, the production yield was 50.78%. The iodine number of the biochar was 318.5 mg/g. The BET surface area of the biochar was 101.54 m2/g. The total pore volumes and pore diameter of the biochar were 0.144 cm3/g and 4.29 nm. respectively. The elemental analysis of biochar at the optimum condition was mainly composed of carbon and oxygen. The ratio of O/C is 0.73 indicating that the biochar is quite stable product against oxidation.
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    Investigation of important parameters for Photo-Fenton degradation of methyl orange over Fe/TiO2 catalyst
    (2020-02-01)
    Sriprom, Pongsert
    ;
    Krobthong, Witthaya
    ;
    Assawasaengrat, Pornsawan
    Methyl orange (MO) is an intensely colored compound used in dyeing and printing textile, which contaminates the effluent. Photo-Fenton reaction is one of the advanced oxidation processes (AOPs) which can treat the pollutant to the green products and small molecules. Photo-Fenton process using Fe/TiO<inf>2</inf>catalyst was applied to decolorization of methyl orange. The Fe/TiO<inf>2</inf> catalyst was prepared by using dry impregnation method. Plackett–Burman Full Factorial was applied to identify the significant parameters in methyl orange decolorization. Six factors (i.e. Fe/TiO<inf>2</inf> catalyst concentration, initial H<inf>2</inf>O<inf>2</inf> concentration, initial MO concentration, pH, stirring speed, and light intensity) influencing methyl orange decolorization were investigated. The results showed that the regression model for parameter screening was well-fitted with the experiment data, supported by the high R<sup>2</sup> of 0.95. The results also showed that Fe/TiO<inf>2</inf> catalyst dosage, H<inf>2</inf>O<inf>2</inf> concentration, initial MO concentration, stirring speed, and light intensity were the significant effects (P < 0.05) rather than pH. The assumption means a lot in engineering design involving with the confounding multifactor. It could be seen from the conclusion that Plackett–Burman Full Factorial is a suitable tool for screening a large number of parameters, when the complicating interactions of these parameters are involved. Therefore, the key parameters can be found and properly engineered; thus warranting the treatment efficiency and minimizing the cost.
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    Dimethyl ether synthesis via methanol dehydration over BEA zeolite from bagasse fly ash with zircronium- and nickel-ion exchange
    (2014-01-01)
    Pranee, Watcharakorn
    ;
    Assawasaengrat, Pornsawan
    ;
    Neramittagapong, Arthit
    ;
    Intarachit, Sasitorn
    ;
    Neramittagapong, Sutasinee
    The synthesis of dimethyl ether via methanol dehydration has been carried out over Beta zeolite (BEA) and ion-exchanged Beta zeolite from bagasse fly ash using hydrothermal method. The reactions were taken place in a fixed-bed reactor. The effects of nickel and zirconium ionexchanged of BEA were investigated. Ni-BEA zeolite exhibited high methanol conversion rate and DME-resultant upon the reaction temperature from 200 to 225°C with equilibrium-limiting condition over 225°C; Furthermore, the Ni-BEA zeolite presented the best stable activity at 225°C over 1,200 minute. The Ni-BEA zeolite has also been interesting as a zeolite which suited to be one role importance to improve the properties for methanol dehydration to dimethyl ether. © (2014) Trans Tech Publications, Switzerland.