scholarly journals Vapor pressures of phenolic compounds found in pyrolysis oil

2020 ◽  
Author(s):  
Parsa Mozaffari ◽  
Zachariah Baird ◽  
oliver järvik
Keyword(s):  
Phenolic Compounds ◽  
Vapor Pressure ◽  
Test Method ◽  
Measured Temperature ◽  
Pyrolysis Oil ◽  
Vapor Pressures ◽  
Pressure Data ◽  
Scanning Calorimetry ◽  
Vapor Pressure Data ◽  
Density Data

Oil produced from pyrolysis of Kukersi te oil shale and lignocellulosic biomass both contain significant amounts of phenolic compounds. Here we present new experimental vapor pressure data for two such compounds (4-ethyl-2-methoxyphenol and 5-methylresorcinol) and also for a mixture of phenolic compounds extracted from pyrolysis oil (HoneyolTM). Vapor pressure data was measured by high pressure differential scanning calorimetry (DSC), in accordance with the ASTM E 1782 standard test method. The measurements were conducted in the pressure range from 0.89 kPa to atmospheric pressure. The measured temperature ranges for the vapor pressure were 374.5 to 509.1 K for 4-ethyl-2-methoxyphenol, 428.0 to 565.0 K for HoneyolTM and 429.4 to 565.8 K for 5-methylresorcinol. Density data for 4-ethyl-2-methoxyphenol were also measured at 293.15 to 363.15 K. The experimental vapor pressure and density data for 4-ethyl-2-methoxyphenol were fitted using the PC-SAFT equation of state, and the vapor pressure data for the other compounds was fit using the Antoine equation. Enthalpies of vaporization were also calculated. The properties of these compounds were then compared to literature data for other pure phenolic compounds and mixtures of the phenolic compounds from Kukersite shale oil. This comparison indicates that some pure compounds, such as 4-ethyl-2-methoxyphenol, could be used as model compounds for estimating the properties of the phenolic portion of pyrolysis oil.

Vaporization Kinetics and Vapor Pressures for Petroleum Fractions Using Thermogravimetry Analysis

2011 ◽  
Vol 236-238 ◽  
pp. 534-537
Author(s):  
Dan Li
Keyword(s):  
Experimental Data ◽  
Vapor Pressure ◽  
Reasonable Agreement ◽  
Pressure Range ◽  
Vapor Pressures ◽  
Pressure Data ◽  
Vapor Pressure Data ◽  
Petroleum Fractions ◽  
Vaporization Process ◽  
Linear Trends

Thermogravimetric analysis (TGA) was extended to the measurements of vaporization kinetics and vapor pressures for three oil samples. The energies of activation for the vaporization process and the enthalpies of vaporization were obtained through the vaporization rates and the vapor pressure data. The experimental data from TGA and comparative ebulliometry are distributed in the same linear trends and are in reasonable agreement. The TGA method is a rapid and practical one for constructing vapor pressure curves, especially at low pressure range, for petroleum fractions. Combination of the TGA and the embulliometry, the vapor pressures in a wide temperature range can be obtained.

A developed equation for predicting the vapor pressure of C-H-O hydrocarbons

2015 ◽  
Vol 40 (3) ◽  
Author(s):  
Mehdi Reiszadeh ◽  
Ehsan Sanjari ◽  
Zahra Jali ◽  
Mohammad Saviz Baktash
Keyword(s):  
Experimental Data ◽  
Vapor Pressure ◽  
Critical Pressure ◽  
Vapor Pressures ◽  
Pressure Data ◽  
Acentric Factor ◽  
Vapor Pressure Data ◽  
Data Points ◽  
Reduced Temperature

AbstractPrediction of the available vapor pressure data in the case of C-H-O hydrocarbons led to derivation and recommendation of standard equations for this property. The accuracy of vapor pressure estimations is essential because it is used as a basis to calculate the acentric factor and the thermal and equilibrium properties. In this study, an accurately developed equation for calculation of vapor pressure is presented for 213 pure C-H-O hydrocarbons as a function of reduced temperature and critical pressure. With this equation, vapor pressures have been calculated and compared with the experimental data reported in the literatures for 213 pure hydrocarbons for more than 3800 data points, and the overall average absolute percentage deviation is only 0.286%. The accuracy of the developed equation has been compared to Antoine, Wagner, and other most used equations, and the comparison indicates that the developed method provides more accurate results than other methods used in this work.

Vapor Pressure Isotope Effects in Liquidand Solid Ammonia

1989 ◽  
Vol 44 (5) ◽  
pp. 359-370 ◽  
Author(s):  
Tseng-Ven King ◽  
Takao Oi ◽  
Anthony Popowicz ◽  
Karl Heinzinger ◽  
Takanobu Ishida
Keyword(s):  
Vapor Pressure ◽  
Cell Model ◽  
Isotope Effects ◽  
Experimental Uncertainty ◽  
Vapor Pressures ◽  
Pressure Data ◽  
Vapor Pressure Data ◽  
Molecular Forces ◽  
External Forces ◽  
Solid Ammonia

The H/D and 14N/15N vapor pressure isotope effects in liquid and solid ammonia have been measured at temperatures between 163 K and 243 K. The isotopic vapor pressure data have been fitted to T ln (P′P) = A/T- B for the liquid/liquid, liquid/solid and solid/solid ranges of temperature. The triple points are; 195.41 K (45.49 torr) for 14NH3, 198.96 K (48.35 torr) for 14ND3, and 195.58 K (48.83 torr) for 15NH3. The isotopic difference in the vapor pressures of NH3 and ND3 at temperatures between 195.41 K and 198.96 K is nearly independent of temperature within the present experimental uncertainty. The phase ratios of the reduced partition function ratios, fliq/fgas and fsol/fgas, deduced from these results are well represented by Tin (fc/fg) = A/T-B. Molecular forces in the liquid and solid ammonias are discussed using a simple cell and a 4-molecular unit cell model, respectively. The librational motions in the liquid are almost as highly hindered as they are in the solid, but the directionality of the external forces on nitrogen atoms in liquid ammonia is not as well defined as in the solid.

Measurement of Monoatomic Vapor Concentrations of Some Elements by Atomic Absorption Spectrophotometry: Cu, Ag, Au, Mn, and Al

1985 ◽  
Vol 39 (3) ◽  
pp. 526-531 ◽  
Author(s):  
V. K. Panday ◽  
A. K. Ganguly
Keyword(s):  
Vapor Pressure ◽  
Solid Phase ◽  
Metal Vapor ◽  
Atomic Absorption Spectrophotometry ◽  
Vapor Pressures ◽  
Pressure Data ◽  
Vapor Pressure Data ◽  
Absorption Spectrophotometry ◽  
Straight Line ◽  
The Mean

Measurement of the absorbance of resonance radiation from a hollow cathode lamp has been used to study the concentration of monoatomic metal vapor in equilibrium with its solid phase in an inert argon atmosphere (two Torr) over a pressure range 10−7 – 10−4 Torr for copper, silver, gold, manganese, and aluminum. The results obtained by this technique are compared with the vapor pressure data obtained by other workers using different techniques. The monoatomic vapor pressure data plotted against the reciprocal of temperature give a straight line, and the mean enthalpies of vaporization have been calculated from the slope of this line. The enthalpies are in agreement with the values obtained by earlier investigators using different techniques for copper, silver, gold, and manganese, but tend to be lower in the case of aluminum. The absolute vapor pressures calculated by this approach are higher for aluminum in the range of investigations.

scholarly journals Extremely Low Vapor‐Pressure Data as Access to PC‐SAFT Parameter Estimation for Ionic Liquids and Modeling of Precursor Solubility in Ionic Liquids

ChemistryOpen ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 216-226
Author(s):  
Mark Bülow ◽  
Moritz Greive ◽  
Dzmitry H. Zaitsau ◽  
Sergey P. Verevkin ◽  
Christoph Held
Keyword(s):  
Parameter Estimation ◽  
Ionic Liquids ◽  
Vapor Pressure ◽  
Pressure Data ◽  
Vapor Pressure Data
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