Correlation Between the Population of Active Species in Low Pressure Plasmas and Their Reactions with Organic Compounds

1998 ◽  
pp. 523-527
Author(s):  
Pedro. PatiÑo
2009 ◽  
Vol 11 (2) ◽  
pp. 211-215 ◽  
Author(s):  
Li Jie ◽  
Song Ling ◽  
Liu Qiang ◽  
Qu Guangzhou ◽  
Li Guofeng ◽  
...  

1996 ◽  
Vol 432 ◽  
Author(s):  
J. S. Seewald

AbstractOrganic compounds play an integral role in numerous geochemical process in subsurface environments. To evaluate factors that regulate the stability of ethane, ethene, propane, and propene in hydrothermal systems a series of experiments were conducted at 300 to 325°C and 350 bars. The experiments contained the mineral assemblages pyrite-pyrrhotite-magnetite, hematite-magnetite-pyrite, and hematite-magnetite to buffer fO2, aH2(aq) and aH2S(aq) at geologically reasonable values.Results of the experiments suggest that under appropriate physical and chemical conditions, metastable redox dependent thermodynamic equilibrium involving liquid water and inorganic iron-bearing mineral assemblages may regulate the relative abundance of short chain alkanes and their corresponding alkenes. In addition, alkenes represent an important intermediary in the conversion of n-alkanes to methane and oxidized species such as carbon dioxide, ketones alcohols, and organic acids.The rates of redox dependent organic reactions during the experiments were strongly influenced by the presence of sulfur. Under relatively oxidizing conditions greater catalytic activity due to the presence of dissolved sulfur species was observed. Fluid speciation calculations suggest that oxidized aquous sulfur compounds represent the catalytically active species.These results suggest that redox conditions and the presence or absence of dissolved sulfur species in natural sedimentary environments may strongly influence the stability of hydrocarbons. Accordingly, models used to predict the stability of oil and the formations of natural gas need to account for chemical processes that involve both organic and inorganic sedimentary components.


1990 ◽  
Vol 5 (6) ◽  
pp. 471 ◽  
Author(s):  
Lisa K. Olson ◽  
W. Charles Story ◽  
John T. Creed ◽  
Wei-Lung Shen ◽  
Joseph A. Caruso

Using a Fabry-Perot interferometer, the Doppler widths of lines of the CH bands emitted from the reaction zone of an oxy-acetylene flame have been examined. The experimental arrangement and method of computation are described. The effective translational temperatures of the excited CH radicals are around 4000° K in the low-pressure flames, compared with theoretical maximum flame temperatures around 2700° K. At atmospheric pressure the translational temperature is near the expected flame temperature. The effective rotational temperatures have also been measured for the CH bands 4315 and 3900Å and do not differ much from the theoretical maximum flame temperatures for any of the several flames examined. The method of excitation of the CH is discussed. It seems likely that the radicals are excited by collision with other active species in the flame; the high translational temperature shows that we do not have normal thermal excitation, but there are also difficulties in attributing the effects to true chemiluminescence. For the weak CH band at 3143 Å the effective rotational temperature is very high, especially at low pressure.


2020 ◽  
Vol 17 ◽  
Author(s):  
Zia Ul Haq Khan ◽  
Noor Samad Shah ◽  
Nawshad Muhammad ◽  
Arif Ullah Khan ◽  
Jibran Iqbal ◽  
...  

Abstract: In fact, electrochemical method (EC) is a specific and eco-friendly technique with several advantages over common organic synthesis methods. During EC no as such external catalysts are required to initiate the reaction, the current potential in itself acts as a catalyst. Most of the inactive organic compounds can be converted to active species by EC method. This method results in the synthesis of compounds with high yield and purity. This method is also good to be applied for the synthesis of thermally sensitive organic compounds. Such synthesis has significant selectivity and reactivity which enable the synthesis of such compounds that are not feasible while using the conventional methods. This review provides insight into the utilization of EC method in the synthesis of organic compounds and their derivatives. Various prerequisites for such synthesis have been highlighted. The EC method application for preparation of derivatives of benzofuran, and benzoxazole, oxidation of N, N, N’, N’tetramethyl-1,4-phenylenediamine, 5-diethoxy-4-morpholinoaniline, organic compounds containing C=N, benzyl alcohol to benzaldehyde and tetratomic Thioethers have been discussed in detail. In addition, the electrochemical synthesis of biomedical important compounds has been presented. The compounds synthesized through EC methods shows potential antimicrobial activity. Deferent researchers work to study the potential biological application of organic compounds synthesized through EC process. The anti-cancer, anti-bacterial, anti-fungal and other important biological activities has been investigated.


2002 ◽  
Vol 2 (5-6) ◽  
pp. 321-328
Author(s):  
H. Ozaki ◽  
N. Ikejima ◽  
S. Matsui ◽  
Y. Terashima ◽  
S. Takeda ◽  
...  

A new generation of reverse osmosis membranes, low-pressure reverse osmosis (LPRO) membranes, have been developed for operation under very low pressure (below 0.5 MPa). LPRO membranes have received attention especially for their application in the field of water and wastewater treatment, to provide a high water flux at low operating pressure while maintaining very good rejection levels of salts and organics. Our previous work on LPRO has shown that the rejection of some inorganic salts and organic compounds depends appreciably on the pH of the bulk solution, probably because LPRO membranes can have an electric charge. In this study we investigated experimentally the effectiveness of different LPRO membranes in separating inorganic salts and organic compounds from a bulk solution with different pH conditions. We also tried to measure membrane ξ-potential by using a streaming potential method. The results indicated that the membrane ξ-potential as well as the ion size or molecular weight of organics can be considered key factors in the rejection of ionic salts and dissociated organic compounds including pesticides and endocrine disruptors.


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