Comparison of different methods for estimating activity coefficients in binary mixtures of hydrocarbons

1981 ◽  
Vol 46 (7) ◽  
pp. 1541-1548
Author(s):  
Vladimír Dohnal
Keyword(s):  
Activity Coefficient ◽  
Binary Mixtures ◽  
Activity Coefficients ◽  
Regular Solution Model ◽  
Pure Component ◽  
Group Contribution ◽  
Coefficient Estimation ◽  
The Mean ◽  
Group Contribution Methods ◽  
The One

The accuracy and reliability of a number of different methods for predicting activity coefficients in binary solutions of hydrocarbons was tested. Various modifications of the regular solution model and of the one-parameter Wilson equation and various group-contribution methods were applied to a set of 53 binary mixtures of hydrocarbons of different types. The agreement of the calculated and experimental dependence of activity coefficients on composition was considered. On using the best methods requiring the knowledge of pure component properties only, it is necessary to expect on the average an error of 7% in the value of activity coefficient. When using the group-contribution methods, which employ condensed information on related systems for the prediction, the mean error in the activity coefficient estimation lies about 4%.

scholarly journals Flash point of organic binary mixtures containing alcohols: experiment and prediction

2013 ◽  
Vol 11 (3) ◽  
pp. 388-393 ◽  
Author(s):  
Mariana Hristova ◽  
Dimitar Damgaliev
Keyword(s):  
Experimental Data ◽  
Activity Coefficient ◽  
Binary Mixtures ◽  
Activity Coefficients ◽  
Thermodynamic Model ◽  
Flash Point ◽  
Wilson Equation ◽  
Nrtl Equation

AbstractThe flash points of three organic binary mixtures containing alcohols were measured in the present work. The experimental data was obtained using the Pensky-Martens closed cup tester. The experimental data were compared with the values calculated by the Liaw model. Activity coefficients were calculated by the Wilson equation and NRTL equation. The accuracy of predicted flash point values is dependent on the thermodynamic model used for activity coefficient.

Solubility in the System (NH4)2S2O8—NH3—H2O and Mean Activity Coefficients of Saturated Solutions of (NH4)2S2O8

2012 ◽  
Vol 5 (1) ◽  
pp. 12-14
Author(s):  
Jan Balej
Keyword(s):  
Activity Coefficient ◽  
Activity Coefficients ◽  
Pure Water ◽  
Relative Activity ◽  
Mean Activity Coefficient ◽  
The Mean ◽  
Water Values ◽  
Mean Activity Coefficients ◽  
Ammonium Peroxodisulfate ◽  
Saturated Solutions

Solubility in the System (NH4)2S2O8—NH3—H2O and Mean Activity Coefficients of Saturated Solutions of (NH4)2S2O8The solubility data of ammonium peroxodisulfate in aqueous ammonia solutions at 15.5 °C have been evaluated using the relative activity coefficient expansion. Using the known value of the mean activity coefficient of saturated solution of ammonium peroxodisulfate in pure water, values of the mean activity coefficients of this salt in the saturated solutions of the given system have been calculated.

A model of nonelectrolytic behaviour: activity coefficients

1992 ◽  
Vol 70 (6) ◽  
pp. 1631-1634 ◽  
Author(s):  
Prem p. Singh ◽  
Sanjeev Maken
Keyword(s):  
Activity Coefficient ◽  
Binary Mixtures ◽  
Activity Coefficients ◽  
Molecular Complexes ◽  
Text Data ◽  
Molar Volumes

A model is presented for binary mixtures of nonelectrolytes that reproduces successfully the activity coefficient (γi, γj, xi) data for even those (I + j) mixtures that are known to be characterized by the presence of 1:1 or 1:1 and 1:2 molecular complexes or have components that differ appreciably in their molar volumes when only limited [Formula: see text] or [Formula: see text] or [Formula: see text] data are available).

Evaluation of Road Utilisation as Space For Holding Social Ceremonies in Indigenous Residential Area of Ogbomoso, Nigeria

2018 ◽  
Vol 1 (March 2018) ◽  
Author(s):  
S.A Okanlawon ◽  
O.O Odunjo ◽  
S.A Olaniyan
Keyword(s):  
Transport Infrastructure ◽  
Noisy Environment ◽  
Policy Makers ◽  
The Core ◽  
Local Roads ◽  
Strict Enforcement ◽  
The Mean ◽  
The One ◽  
The City ◽  
The Town

This study examined Residents’ evaluation of turning transport infrastructure (road) to spaces for holding social ceremonies in the indigenous residential zone of Ogbomoso, Oyo State, Nigeria. Upon stratifying the city into the three identifiable zones, the core, otherwise known as the indigenous residential zone was isolated for study. Of the twenty (20) political wards in the two local government areas of the town, fifteen (15) wards that were located in the indigenous zone constituted the study area. Respondents were selected along one out of every three (33.3%) of the Trunk — C (local) roads being the one mostly used for the purpose in the study area. The respondents were the residents, commercial motorists, commercial motorcyclists, and celebrants. Six hundred and forty-two (642) copies of questionnaire were administered and harvested on the spot. The Mean Analysis generated from the respondents’ rating of twelve perceived hazards listed in the questionnaire were then used to determine respondents’ most highly rated perceived consequences of the practice. These were noisy environment, Blockage of drainage by waste, and Endangering the life of the sick on the way to hospital; the most highly rated reasons why the practice came into being; and level of acceptability of the practice which was found to be very unacceptable in the study area. Policy makers should therefore focus their attention on strict enforcement of the law prohibiting the practice in order to ensure more cordial relationship among the citizenry, seeing citizens’ unacceptability of the practice in the study area.

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