scholarly journals The Influence of Heterogeneous Chemistry and Electrochemistry on Gas-Phase Molecular-Weight Growth and Deposit Formation

2005 ◽  
Vol 2005-07 (1) ◽  
pp. 679-688 ◽  
Author(s):  
Gaurav K. Gupta
Keyword(s):  
Molecular Weight ◽  
Gas Phase ◽  
Heterogeneous Chemistry ◽  
Deposit Formation ◽  
Weight Growth

scholarly journals Molecular Weight Growth in the Gas-Phase Reactions of Dehydroanilinium Radical Cations with Propene

2019 ◽  
Vol 123 (41) ◽  
pp. 8881-8892 ◽  
Author(s):  
Patrick D. Kelly ◽  
Cameron C. Bright ◽  
Stephen J. Blanksby ◽  
Gabriel da Silva ◽  
Adam J. Trevitt
Keyword(s):  
Molecular Weight ◽  
Gas Phase ◽  
Radical Cations ◽  
Gas Phase Reactions ◽  
Weight Growth

Applied Novel Quality Check Method for PVT Data with High Impurities Using Various Samples from Malaysian Fields

2021 ◽  
Author(s):  
Luky Hendraningrat ◽  
Intan Khalida Salleh
Keyword(s):  
Molecular Weight ◽  
Equation Of State ◽  
Gas Phase ◽  
Oil And Gas ◽  
Comprehensive Evaluation ◽  
Gas Condensate ◽  
Fluid Composition ◽  
Essential Information ◽  
Pvt Data ◽  
Wide Range

Abstract PVT analysis of reservoir fluid samples provides essential information for determining hydrocarbon in place, depletion strategy, and hydrocarbon flowability. Hence, quality checking (QC) is necessary to ensure the best representative sample for further analysis. Recently, a novel tool based on Equation of State (EOS) was introduced to tackle the limitation of the Hoffmann method for surface samples with high impurities and heavier components. This paper presents comprehensively evaluating a novel EOS-based method using various PVT data from Malaysian fields. Numerous PVT separator samples from 30 fields with various reservoir fluids (Black Oil, Volatile, and Gas Condensate) were carried out and evaluated. The impurities contain a wide range of up to 60%. The 2-phase P-T (pressure and temperature) diagram of each oil and gas phase before recombination was calculated using PVT software based on Equation of State (EOS). The 2-phase P-T diagram was created and observed the intersection point as calculated equilibrium at separator conditions. Once it is observed and compared with written separator condition in the laboratory report and observed its deviation. Eventually, the result will be compared with the Hoffmann method. The Hoffmann method is well-known as a traditional QC method that was initially developed using gas condensate PVT data to identify possible errors in measured separator samples. If the sample has high impurities and/or heavier components, the Hoffmann method will only show a straight line to the lighter components and those impurities and heavier components will be an outlier that engineers will misinterpret that it has errors and cannot be used for further analysis such PVT characterization. The QC using EOS-based were conducted using actual fields data. It shows potential as novel QC tools but observed only less than 10% of data with complete information that can meet intersection points located precisely similar with reported in the laboratory. There is some investigation and evaluation of the EOS-based QC method. First, most of the molecular weight of the heavier fluid composition of gas and oil phase was not reported or used assumptions especially when its mole fraction is not zero. Second, properties of heavier components of the oil phase (molecular weight and specific gravity) were not measured and assumed similar as wellstream. Third, pressure and temperature data are inconsistent between the oil and gas phase at the separator condition. This study can provide improvement in laboratory measurement quality and help engineers to have a better understanding of PVT Report, essential data requirements, and assumptions used in the laboratory. Nevertheless, the Hoffmann method can be used as an inexpensive QC tool because it can be generated in a spreadsheet without a PVT software license. Both combination techniques can provide a comprehensive evaluation for separator samples with high impurities before identifying representative fluid for further analysis.

scholarly journals Virus-like particle size and molecular weight/mass determination applying gas-phase electrophoresis (native nES GEMMA)

2019 ◽  
Vol 411 (23) ◽  
pp. 5951-5962 ◽  
Author(s):  
Victor U. Weiss ◽  
Ronja Pogan ◽  
Samuele Zoratto ◽  
Kevin M. Bond ◽  
Pascale Boulanger ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Particle Size ◽  
Gas Phase ◽  
Mass Determination ◽  
Virus Like Particle

The role of alkoxy radicals in the heterogeneous reaction of two structural isomers of dimethylsuccinic acid

2015 ◽  
Vol 17 (38) ◽  
pp. 25309-25321 ◽  
Author(s):  
Chiu Tung Cheng ◽  
Man Nin Chan ◽  
Kevin R. Wilson
Keyword(s):  
Molecular Weight ◽  
Hydroxyl Radicals ◽  
Heterogeneous Reaction ◽  
Methyl Groups ◽  
Structural Isomers ◽  
Alkoxy Radicals ◽  
Weight Growth ◽  
Bond Scission

The heterogeneous reaction of hydroxyl radicals with two isomers of dimethylsuccinic acid is used to explore how the location of branched methyl groups controls C–C bond scission and molecular weight growth reactions.

Gas phase polymerization of 1,3-butadiene with supported neodymium-based catalyst: Investigation of molecular weight

2004 ◽  
Vol 92 (3) ◽  
pp. 1945-1949 ◽  
Author(s):  
Xufeng Ni ◽  
Junfei Li ◽  
Yifeng Zhang ◽  
Zhiquan Shen
Keyword(s):  
Molecular Weight ◽  
Gas Phase ◽  
Gas Phase Polymerization

scholarly journals Functionalized carboxylate deposition of triphenylamine-based organic dyes for efficient dye-sensitized solar cells

RSC Advances ◽  
2018 ◽  
Vol 8 (56) ◽  
pp. 31943-31949 ◽  
Author(s):  
Md Ataul Mamun ◽  
Qiquan Qiao ◽  
Brian A. Logue
Keyword(s):  
Molecular Weight ◽  
Solar Cells ◽  
Gas Phase ◽  
Organic Dyes ◽  
Dye Sensitized Solar Cells ◽  
Dip Coating ◽  
Dye Sensitized ◽  
Large Molecular Weight ◽  
Dye Loading ◽  
Sensitized Solar Cells

Functionalized carboxylate deposition involves deposition of molecules from the gas phase and is an alternative dye loading technique to dip-coating. It was used to create a monolayer of large molecular weight dyes on TiO2, providing multiple advantages to dip-coating.

scholarly journals Distributions and sources of low-molecular-weight monocarboxylic acids in gas and particles from a deciduous broadleaf forest in northern Japan

2019 ◽  
Vol 19 (4) ◽  
pp. 2421-2432 ◽  
Author(s):  
Tomoki Mochizuki ◽  
Kimitaka Kawamura ◽  
Yuzo Miyazaki ◽  
Bhagawati Kunwar ◽  
Suresh Kumar Reddy Boreddy
Keyword(s):  
Molecular Weight ◽  
Gas Phase ◽  
Nonanoic Acid ◽  
Low Molecular Weight ◽  
Forest Site ◽  
Particle Phase ◽  
Broadleaf Forest ◽  
Monocarboxylic Acids ◽  
Deciduous Broadleaf Forest ◽  
Northern Japan

Abstract. To better understand the distributions and sources of low-molecular-weight (LMW) monocarboxylic acids (monoacids) in the forest atmosphere, we conducted simultaneous collection of gaseous and particulate samples at a deciduous broadleaf forest site in northern Japan. LMW normal (C1–C10), branched (iC4–iC6), hydroxyl (glycolic and lactic) and aromatic (benzoic) monoacids were detected in the gas and particle phases. The dominant LMW monoacids in gas phase were formic (mean: 953 ng m−3) and acetic (528 ng m−3) acids followed by propionic (37 ng m−3) or isopentanoic (42 ng m−3) acid. In the particle phase, isopentanoic (159 ng m−3) was dominant, followed by acetic (104 ng m−3) and formic (71 ng m−3) or lactic (65 ng m−3) acids. Concentrations of LMW monoacids did not show correlations with anthropogenic tracers such as nss-SO42- and NO3-, indicating that anthropogenic contribution is not important. Concentrations of C1–C6 monoacids in the gas phase showed positive correlations (r2=0.21–0.91) with isobutyric acid (iC4), which may be produced by microbial activity in soil. The forest soil may be a source of gaseous C1–C6 monoacids in the forest atmosphere. Acetic acid in the particle phase positively correlated with nonanoic acid (C9) (r2=0.63), suggesting that formation of acetic and nonanoic acids is associated with the oxidation of biogenic unsaturated fatty acids in the aerosol phase, in addition to photochemical oxidation of biogenic volatile organic compounds. The particle-phase fractions (Fp) of formic and acetic acids showed negative correlation with ambient temperature (C1: r2=0.49, C2: r2=0.60) but showed positive correlation with relative humidity (C1: r2=0.30, C2: r2=0.55) in daytime, suggesting that these meteorological parameters are important for the gas and particle portioning of monoacids in the forest atmosphere.

Sign in / Sign up

Export Citation Format

Share Document