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Utilization of rice-husk packed beds as fine dust collectors at heavy dust loadings
Sira Srinives,Wiwut Tanthapanichakoon,Tawatchai Charinpanitkul 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.2
Typical rice mills generally generate tonnes of biomass which is rice husks and a significant quantity of coarse and fine dusts from the paddy, resulting in public health concern. Instead of normal air cyclones which are not efficient for collecting fine soft-hair (detached pubescence) particles smaller than a few microns, a new system using packed beds of rice husks was developed for collection fine dusts. It was found that the rice-husk packed beds could exhibit an effective performance in capturing fine dusts at various dust loadings with collection efficiency higher than 85% by mass. The filtrating phenomenon could be observed as an integrated effect of cake and deep-bed filtrations due to the heavy dust loads, agglomeration of dusts, and cohesion between the dusts and bed of irregularly shaped rice husks. Both the pressure drop across the bed and the overall filtration efficiency remarkably increased at the initial clean stage, then increased more slowly due to the recurrent fracture of the dust cake layer.
Tawatchai Charinpanitkul,Wiwut Tanthapanichakoon,Poj Kulvanich,Kyo-Seon Kim 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.5
Influence of fluidizing air velocity, temperature and atomizing air pressure, as well as types of raw materials on the size distribution, shape and flow properties of pharmaceutical granules, which were tabletized using a single punch tableting machine, was experimentally investigated. The granules prepared at the fluidizing air velocity of 0.8 m/s had average particle size larger than those obtained at higher air velocity. Meanwhile the fluidizing air temperature had moderate effect on the average particle size of the granules. However, an increase in the atomizing air pressure resulted in an increase in amount of fine particles, leading to the smaller mean particle size. From microscopic analysis, a primary lactose particle wetted by binder had several contact points with other particles inside the prepared granules. Based on granule morphology, it can be implied that the granules are formed by the so-called snowballing mechanism, leading to the relatively spherical structure. In tabletization, the granules with higher average particle size provided tablets with the less weight variation and friability. Meanwhile, the tablets produced from lactose–corn starch mixture had shorter disintegration time than those of lactose powder only.
Pramote Puengjinda,Noriaki Sano,Wiwut Tanthapanichakoon,Tawatchai Charinpanitkul 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.3
Selective synthesis of well aligned multi-walled carbon nanotubes (MW-CNT) and multi-shelled carbon nanocapsule (MS-CNC) using pyrolysis of naphthalene with the presence of ferrocene was experimentally examined. With higher mole fraction of naphthalene to ferrocene, more MW-CNTs could be synthesized due to higher concentration of carbonaceous precursors emerging from the decomposed naphthalene. Based on kinetic analysis, at lower temperature, MW-CNTs could preferably be synthesized due to the controlled supply of carbonaceous clusters to get onto the surface of Fe clusters. On the other hand, at temperature higher than 900℃ the Fe clusters become more active to catalyze carbonaceous precursors to undergo self assembling process of MS-CNCs. With cheaper cost of naphthalene compared with other high-value hydrocarbons, usage of naphthalene would provide an advantage of reasonably economical synthesis of MW-CNT or MS-CNC.
Enzymatic hydrolysis of rawhide using papain and neutrase
Siriporn Damrongsakkul,Kongpob Ratanathammapan,Kittinan Komolpis,Wiwut Tanthapanichakoon 한국공업화학회 2008 Journal of Industrial and Engineering Chemistry Vol.14 No.2
Rawhide split was hydrolysed separately by two proteolytic enzymes, papain and neutrase. The effects of enzymatic conditions of the hydrolysis reaction were investigated. During the first 10 min of the enzymatic hydrolysis, the yield of the hydrolysed protein increased sharply, then it slowly increased or became essentially constant due to the limited availability of the substrate. The optimum hydrolysis conditions of papain and neutrase for highest protein yield are at 70 ℃,pH6–7 and 40–50 ℃,pH6–7, respectively. The product frompapain hydrolysis is a gelatin with lowgel strength and viscosity,while that fromneutrase hydrolysis is collagen hydrolysatewith viscosity as lowas water. This is considered to indicate that longer fragments of protein are obtained from papain hydrolysis than that from neutrase implying different mechanisms of papain and neutrase hydrolysis
Tawatchai Charinpanitkul,Benjapol Kongsombut,Wei Chen,Atsushi Tsutsumi,Wiwut Tanthapanichakoon 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.4
Rapid expansion of supercritical solution (RESS) was used for preparing polymer particles and polymer coating of ultra fine powders. The polymer of pharmaceutical interest was Poly(lactic-co-glycolic acid) (PLGA with PLA : PGA ratio of 85 : 15 and MW of 50,000-75,000) and the simulated core particles were 1.4-μm SiO2 and 70- nm TiO2 particles. The supercritical solution was prepared by dissolving PLGA in supercritical carbon dioxide with ethanol as a cosolvent. Supercritical solution of CO2-PLGA was sprayed through capillary nozzles to ambient conditions, resulting in formation of submicron PLGA particles. Similarly, rapid expansion of supercritical solution of CO2- PLGA suspended with the core particles could provide solvent evaporation and deposition of submicron PLGA particles on the surface of the core particles, resulting in the formation of coating films on dispersed particles of SiO2 and agglomerates of TiO2. The influences of the core particle size, spray nozzle diameter as well as powder-to-polymer weight ratio were also investigated and discussed with respect to the coating performance
Hydrothermal synthesis of titanate nanostructures with high UV absorption characteristics
Nawin Viriya-Empikul,Noriaki Sano,Takeyuki Kikuchi,Sareeya Bureekaew,Wiwut Tanthapanichakoon,Tawatchai Charinpanitkul 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.1
The titanate nanostructures with high UV absorption characteristics could be fabricated by hydrothermal method within a temperature range of 90–150 8C. TEM, XRD, BET analyses, and UV–vis spectroscopy were employed to elucidate the synthesized titanate nanostructure characteristics which were microstructure, phase transformation, specific surface area, and band gap energy, respectively. With an increase in the hydrothermal treating temperature from 90 to 120 8C, the specific surface area of titanate nanostructures was increased from 83 to 258 m2/g,while the band gap energy of titanate nanostructures was increased from 3.44 to 3.84 eV and then slightly decreased to 3.81 eV at 150 8C. The fabricated titanate nanostructures could exhibit higher UV adsorption capability but lower photocatalytic activity when compared with that of commercial TiO2 powders.