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| Thesis Name：Detailed kinetics of the Fischer-Tropsch synthesis over an industrial Fe-Mn catalyst during early period of reaction |
| Country：[CN] |
Usage：[Chemical Engineering] |
| Remarks： |
The detailed kinetics of Fischer-Tropsch synthesis (FTS) over an industrial Fe-Mn catalyst during early period of reaction (200 h Time on stream (TOS)) was studied in a continuous fixed bed reactor under operation conditions of the low temperature and low H2/CO ratio. 39 combined kinetic models of FTS based on the LHHW type mechanism were scanned with non-linear regression method. The conclusion in this work is consistent with that obtained in our previous work under higher reaction temperature and H2/CO ratio of syngas. The FTS model based on alkylidene mechanism could produce a good fit of experimental data. In this work, the estimated activation energy for chain growth is 60.55 kJ.mol-1, which is lower than that of our previous study (75.52kJ.mol-1), indicating that the energy barrier for the chain growth is lower for the catalyst with shorter TOS. This can well interpret the trend to higher selectivity of the lower molecular hydrocarbon, especially the methane, with longer TOS observed in our previous work, which probably results from phase change of catalyst in the course of the synthesis reaction. |
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| Thesis Name：Low-Level Chemical Sensitivity: Implications for Research and Social Policy |
| Country：[CN] |
Usage：[chemistry] |
| Remarks： |
Abstract There is increasingly evidence that human exposure to levels of chemicals once thought to be safe -- or presenting insignificant risk -- are, in fact, harmful. So-called low-level exposures are now known to be associated with adverse biological effects including cancer, endocrine disruption, and chemical sensitivity. This requires that we change both (1) the way we design research linking chemicals and health, and (2) the solutions we devise to address chemically-caused injury. The new and emerging science of lowlevel exposure to chemicals requires appropriate social policy responses which include regulation of toxic substances, notification of those exposed, and compensation and reasonable accommodation to those affected. Research and social policy needs to be focused towards two distinct groups: (1) those individuals who could become chemically intolerant as a result of an initiating exposure and (2) those individuals who have already become chemically intolerant and are now sensitive to chemicals at low levels. |
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| Thesis Name：De-Oder's Technologies for Petrochemical plants |
| Country：[CN] |
Usage：[Chemical Engineering] |
| Remarks： |
The integral petrochemical industry of Taiwan has been booming since the
participation of No. 6 Naphtha Cracking Petrochemical Complex of Formosa
Plastics Group in the End of 1998. The total oil refining quantity has been
increased from 770,000 barrels (refined by CPC only) to 1,220,000 barrels at
the growth of 58%. The total productivity of Ethylene has also been increased
from 1,000,000 tons (produced by CPC only) to 2,700,000 tons at the growth of
170%. For the time being, Formosa Plastics Group is devoting herself to
expanding the productivity continuously and foreseeing to increase the total
oil refining quantity to reach 1,370,000 barrels and the total productivity of
Ethylene to reach 3,900,000 tons two years later. In the meanwhile, the
related down stream manufacturers are also expanding or enlarging the
production facilities correspondingly. As the tremendous addition of the
production facilities of petrochemical industry, the subject of safety,
health & environment protection has to be further concerned.
The main pollutants of the petrochemical plants are VOC & emission of odors,
especially the sulfides which is not only resulting in the loss of materials
but also detrimental to the environment, human beings & the equipments. Thus,
this study is primarily to outline the odors generated from the petrochemical
industry and to compare the characteristics of some devices such as: floating
cover of the storage tank and the seals for the pumps which are subject to
generate the emission or leakage of VOC during storage and transportation of
the raw materials and products. It can provide some useful guidelines to the
engineers whom are dealing with EPC of the related equipments and to eliminate
the emission or leakage of VOC from the origin.
Besides, regarding the odors of sulfides generated from the processes of the
petrochemical plants, two experiments have been carried out to identify the
merits & demerits- applying Amine/C absorber to absorb and applying Pt/C
catalyst to de-sulfur (de-odor) by the oxidizing reaction to provide the
alternative solution to find out the better methods of absorption or de-odor
to minimize the detriments of sulfides to human beings and to improve the air
quality of our environment effectively.
Original file: http://192.192.58.195/theabs/1/eng/ |
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| Detail |
| Thesis Name：De-Oder's Technologies for Petrochemical plants |
| Country：[CN] |
Usage：[De-Oder's Technologies] |
| Remarks： |
The integral petrochemical industry of Taiwan has been booming since the
participation of No. 6 Naphtha Cracking Petrochemical Complex of Formosa
Plastics Group in the End of 1998. The total oil refining quantity has been
increased from 770,000 barrels (refined by CPC only) to 1,220,000 barrels at
the growth of 58%. The total productivity of Ethylene has also been increased
from 1,000,000 tons (produced by CPC only) to 2,700,000 tons at the growth of
170%. For the time being, Formosa Plastics Group is devoting herself to
expanding the productivity continuously and foreseeing to increase the total
oil refining quantity to reach 1,370,000 barrels and the total productivity of
Ethylene to reach 3,900,000 tons two years later. In the meanwhile, the
related down stream manufacturers are also expanding or enlarging the
production facilities correspondingly. As the tremendous addition of the
production facilities of petrochemical industry, the subject of safety,
health & environment protection has to be further concerned.
The main pollutants of the petrochemical plants are VOC & emission of odors,
especially the sulfides which is not only resulting in the loss of materials
but also detrimental to the environment, human beings & the equipments. Thus,
this study is primarily to outline the odors generated from the petrochemical
industry and to compare the characteristics of some devices such as: floating
cover of the storage tank and the seals for the pumps which are subject to
generate the emission or leakage of VOC during storage and transportation of
the raw materials and products. It can provide some useful guidelines to the
engineers whom are dealing with EPC of the related equipments and to eliminate
the emission or leakage of VOC from the origin.
Besides, regarding the odors of sulfides generated from the processes of the
petrochemical plants, two experiments have been carried out to identify the
merits & demerits- applying Amine/C absorber to absorb and applying Pt/C
catalyst to de-sulfur (de-odor) by the oxidizing reaction to provide the
alternative solution to find out the better methods of absorption or de-odor
to minimize the detriments of sulfides to human beings and to improve the air
quality of our environment effectively.
Original file:http://192.192.58.195/theabs/1/eng/ |
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| Thesis Name：Chemical vapor deposition of organosilicon composite thin films for porous low-k dielectrics |
| Country：[CN] |
Usage：[Chemical Engineering] |
| Remarks： |
Pulsed plasma enhanced chemical vapor deposition has produced organosilicon thin films with the potential use as low dielectric constant interconnect materials in microelectronic circuits. Both diethylsilane and octamethylcyclotetrasiloxane precursors were used, with oxygen and hydrogen peroxides oxidants respectively, to deposit low-k organosilicon films. FTIR, nanoindentation, ellipsometry, and dielectric constant measurements were demonstrated as a valuable film characterization tools to understand structure-property-processing fundamentals by quantifying structural bonding environments and relating those to the film properties. Nanocomposites were also produced using two novel techniques. First, crystal colloidal templates of polystyrene nanospheres were fabricated using evaporation-induced self-assembly. OSG was then deposited throughout the templates to create composite materials. Subsequently the polystyrene was removed upon thermal annealing to create highly porous OSG thin fil... |
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| Thesis Name：Analysis of signal transduction networking using activation ratios |
| Country：[CN] |
Usage：[Chemical Engineering] |
| Remarks： |
The molecular processes by which information is incorporated and distributed within a cell are termed signal transduction. These pathways allow cells to interact with each other and with their environments and are critical to the proper cellular function in a variety of contexts. Previously developed methods for analyzing signaling networks have been largely ignored, most likely due to their mathematical complexity and difficulty in application. A novel analysis framework was developed to assist in the examination of signaling networks, both to facilitate the reconstruction of previously undetermined pathways as well as to quantitatively characterize interactions between components. This approach, termed activation ratio analysis, involves the ratio between active and inactive forms of signaling intermediates at steady state. The activation ratio of an intermediate is shown to depend linearly upon the concentration of the activating enzyme. The slope of the line is defined as the activ... |
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| Thesis Name：Study on the solid phase extraction and spectrophotometric determination of gold in water and ore with 5-(p-aminobenzylidene)-thiorhodanine |
| Country：[CN] |
Usage：[chemistry] |
| Remarks： |
In this paper, a new chromogenic reagent, 5-(p-aminobenzylidene)-thiorhodanine (ABTR) was synthesized. A high sensitive, selective and rapid method for the determination of gold based on the rapid reaction of gold with ABTR and the solid phase extraction of the colored chelate with a reversed phase polymer-based C18 cartridge has been developed. In the presence of 0.05-0.5 mol L-1 of hydrochloric acid solution and emulsifier-OP medium, ABTR reacts with gold to form a red chelate of a molar ratio 1:3 (gold to ABTR). This chelate was enriched by the solid phase extraction with a polymer-based C18 cartridge and eluted to form the chelate from cartridge with dimethyl formamide (DMF). The ABTR-Au(III)) chelate in 100 mL solution can be concentrated to 1.0 mL, and the enrichment factor of 100 was achieved. In the DMF medium, the molar absorptivity of the chelate is 1.23×105 L.mol-1.cm-1 at 550 nm. Beer's law is obeyed in the range of 0.01- 3 mg mL-1 in the measured solution. The relative standard deviation for eleven replicate samples of 0.5 mg L-1 level is 2.18%. The detection limit, based on the three times of standard deviation is 0.02 mg L-1 in the original sample. This method was applied to the determination of gold in water and ore with good results.
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| Thesis Name：The new progress of active polysaccharides in anti-tumor mechanisms |
| Country：[CN] |
Usage：[chemistry] |
| Remarks： |
As one of most important components in creatures, polysaccharides have very important bioactivities. Polysaccharides can improve human beings immune function, such as anti-tumor, anti-acquired immunity deficiency syndrome, anti-mutation, anti-radiation and down the blood pressure. Polysaccharides appear to exert its anti-carcinogenic properties by inhibiting the proliferation of tumor cells and improving human beings immune function. This paper summarizes the proceeding achievement about anti-tumor mechanisms of active polysaccharides. |
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| Thesis Name：Study on the interaction between protein and 8-anilino-1-naphthalenesulfonic acid by resonance light scattering technique |
| Country：[CN] |
Usage：[chemistry] |
| Remarks： |
The hydrophobic interaction between protein and 8-anilino-1-naphthalenesulfonic acid (ANS) can lead to the fluorescence enhancement of ANS. Therefore, ANS is widely used as a fluorescent probe for structure investigation and quantitative determination of proteins. In this article, the binding mechanism between protein and ANS was studied by resonance light scattering (RLS) and fluorescence spectra. It was found that only at certain pH ranges the hydrophobic interaction was the dominant binding modes between ANS and protein. When pH value is near 4.1, protein will bind ANS mainly through the electrostatic interaction, which can result in strongly enhanced RLS intensity of ANS. So ANS may be used as an electrostatic probe to study the electrostatic interaction between protein and small molecules with RLS technique. The enhanced RLS intensity at 452 nm was proportional to the concentration of bovine serum albumin (BSA) in a range of 0.01-6.0 mg/ml and the detection limit (3s) of BSA was 3.0 ng/ml. By using ANS as a probe, the proposed RLS method has about an order of magnitude higher sensitivity for protein determination compared to that of fluorescent method.
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| Thesis Name：Nano TiO2 and anti-Bacterial material |
| Country：[CN] |
Usage：[Adding in the process] |
| Remarks： |
Used in paint, coating, textile,cosmetic,glass etc for anti-UV, anti-bacterial and self-cleaning. |
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