2 edition of extraction of pentachlorophenol from pressure treated wood using supercritical carbon dioxide found in the catalog.
extraction of pentachlorophenol from pressure treated wood using supercritical carbon dioxide
Written in English
|Statement||by Jung-Seok Yi.|
|The Physical Object|
|Pagination||77 leaves, bound. :|
|Number of Pages||77|
Supercritical fluid extraction of pentachlorophenol from pressure-treated wood. Separation Science and Technology 32(6) Progress 01/01/97 to 12/31/97 Outputs Studies to develop a better understanding of the effects of pressure change on the dimensional stability of wood during supercritical fluid impregnation are continuing. The treated wood chips are then subjected to supercritical fluid treatment, at high pressure and moderate temperatures, using, for example, carbon dioxide and modifiers. The process can be closely regulated by varying temperature or pressure. The pentachlorophenol in the resulting extract can be recovered for either reuse or disposal.
The second use is the long-term protection of wood from fungi by soaking it or permeating it in an autoclave with solvents containing pentachlorophenol at % concentration. Protection lasts years. This is the only use of pentachlorophenol in the United States. Supercritical fluid extraction (SFE) is an alternative sample preparation method with general goals of reduced use of organic solvents and increased sample throughput. The factors to consider include temperature, pressure, sample volume, analyte collection, modifier (cosolvent) addition, flow and pressure control, and Size: KB.
Pentachlorophenol (PCP) is an organochlorine compound used as a pesticide and a produced in the s, it is marketed under many trade names. It can be found as pure PCP, or as the sodium salt of PCP, the latter which dissolves easily in al formula: C₆HCl₅O. United States Environmental Protection Agency National Risk Management Research Laboratory Research Triangle Park, NC Research and Development EPA//SR/ 4>EPA Project Summary Products of Incomplete Combustion from Direct Burning Of Pentachlorophenol-treated Wood Wastes S.Y. Lee and J.C. Valenti The report gives results of a study to identify potential air pollution .
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The Extraction of Pentachlorophenol from Pressure Treated Wood Using Supercritiical Carbon Dioxide AN ABSTRACT OF THE THESIS OF Tung-Seok Yi for the degree of Master of Science in Chemical Engineering presented on Novem The extraction of pentachlorophenol (PCP) from pressure treated wood wafers with supercritical carbon dioxide has been studied.
Experimental data were obtained for the effects of pressure ( - MPa), temperature ( - K), flow rate (1 - 3 ml/min at supercritical conditions), and sample size ( x 10 x 50 mm and x 10 x 50 mm) by measuring the effluent concentration versus : Jung-Seok Yi.
Graduation date: The extraction of pentachlorophenol (PCP) from pressure treated wood\ud wafers with supercritical carbon dioxide has been studied. Supercritical Fluid Extraction of Pentachlorophenol from Pressure-Treated Wood.
Separation Science and Technology32 (6), DOI: /Cited by: PCP was extracted from leather with supercritical carbon dioxide and in situ derivatized with acetic anhydride in the presence of a base (e.g., triethylamine).
Supercritical fluid extraction of pentachlorophenol from pressure-treated wood. Separation Science and Technology32(6)– Schneider, P. F Pressure measurement in wood as a method to understand pressure impregnation process: Bethell, Rueping, Lowry and supercritical carbon dioxide.
diss., Oregon State University, Corvallis. When chelants are used as cosolvents, the complexing agents bind to the metal ions, hence enabling extraction of the resulting complexes into the supercritical medium.
The structures of the complexing molecules alter the polarity of the fluid medium, hence increasing the extraction of metal ions .Author: Daniel Assumpção Bertuol, Franco Rico Amado, Estevan Dorneles Cruz, Eduardo Hiromitsu Tanabe.
Contamination of the environment by waste CCA (Cu, Cr, As) wood, containing the toxic heavy metals, copper, chromium, and arsenic that are hazardous to human health, can be significantly reduced by supercritical fluid extraction (SFE) technology. An environmentally benign solution for the detoxification of these CCA woods is the use of SFE technology for the treatment because no extra pollutant Cited by: The posterior derivatization with TEA-AA of the TSE extracts using a Soxhlet system, was very slow, about 6 h.
Instead, when the derivatization reaction is carried out under carbon dioxide supercritical (CO 2, sc) fluid, it is completed in only 30 minutes, and the yield is equal to the reaction made in Soxhlet system. Because of that, we prefer Cited by: 5.
MATERIAL SAFETY DATA SHEET 1. Product and Company Identification Material name Penta OL Technical Pentachlorophenol Revision date Version # 01 CAS # Mixture Product use Wood preservative. Synonym(s) None. Manufacturer/Supplier KMG- File Size: KB.
Exposure to pentachlorophenol in the indoor air of pressure-treated log homes brushed with pentachlorophenol has been measured at to parts per billion (ppb), and levels in the air of industrially dipped, non-pressure-treated log homes have been measured at to ppb.
Levels. Supercritical Fluid Extraction of Pentachlorophenol from Pressure-Treated Wood. Separation Science and Technology32 (6), DOI: / P.
Chen, W. Zhou, L. Tavlarides. Remediation of polychlorinated biphenyl contaminated soils/sediments by supercritical fluid by: Report • The role of pentachlorophenol treated wood for emissions of dioxins into the environment 7 As most of the dip‑treatment plants were in southern Sweden, it is very likely that most of the dip‑treated wood was used in this region, probably for the construction of detached houses built over the period ‑ Ohira T., Ytagai M., Itoya Y., and Nakamura S.
() Efficient extraction of hinokitiol from wood of Hiba with supercritical carbon dioxide. Mokuzai gakkaishi. 42, – Google ScholarCited by: 3. Abstract Solvent extraction of pent achlorophenol (PCP) from wood chips of the PCP-treated ammunition box has been studied using methanol, ethanol and acetonitrile.
Experimental variables were chosen as the composition of sol-vents, the ratio of solvent per dried wood, size of the substance, extraction temperature and sonication applied to the. tors. Supercritical fluid extraction was carried out at constant temperature and time and the pressure of extraction was varied.
The pressure of extraction of scopoletin from different plant varieties reported in the literature was with ethanol as a modifier–18 In this experiment only pure carbon dioxide.
The extraction of pentachlorophenol (PCP) from pressure-treated wood wafers with supercritical carbon dioxide (SC-CO2) was studied in a continuous-flow extractor.
Ohira T., Terauchi F., and Yatagai M. () Tropolones extracted from the wood of western red cedar by supercritical carbon dioxide.
Holzforsch – CrossRef Google ScholarCited by: 3. Jung-Seok Yi has written: 'The extraction of pentachlorophenol from pressure treated wood using supercritical carbon dioxide' -- subject(s): Pentachlorophenol, Supercritical fluid extraction Asked.
The extraction of caffeine from whole coffee beans with supercritical carbon dioxide was studied in a continuous‐flow extraction apparatus. Decaffeination rates were determined as a function of CO 2 flow rate, temperature and pressure by continuously monitoring the caffeine in the effluent with a flame ionization detector.
The full text of this article hosted at is unavailable due to technical difficulties.preserving wood, the pressure process and the non-pressure process. The pres-sure-treating process involves placing the wood in a pressure-treating vessel where it is immersed in the preserva-tive and then subjected to applied pres-sure.
The excess penta is vacuumed from the vessel and the treated wood is removed, inspected, stored, and shipped.treated wood may lead to further formation of these contaminant compounds. Pentachlorophenol volatilizes from treated wood. It has a significant phenolic odor, which becomes quite strong when the material is heated.
Though not registered for indoor use, heavily treated interior surfaces may be a source of exposure sufficient.