Document Details
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Document Type |
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Project |
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Document Title |
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Estimate the demand for gasoline in the Kingdom of Saudi Arabia. تقدير الطلب على بنزين السيارات في المملكة العربية السعودية. |
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Document Language |
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Arabic |
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Abstract |
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This project is a study of the inhibitory properties of Mkalpaat the erosion of the active metals (aluminum, zinc and copper), using mineral acids (hydrochloric and sulfuric and nitric) and alkali metal hydroxides. And youve test inhibitory properties of Mkalpaat containing atoms (oxygen and nitrogen and sulfur) Electronics donor each alone, or mixed in the same compound in solution mentioned chemical methods (low weight and measurements of gas) and electrochemical (polarization dynamic Aljhda). Then find a relationship between these results and the molecular structure of each Almkalpaat used. And recent studies have shown in our labs that the relationship between inhibition efficiency and concentration of inhibitor in the solution takes the form of adsorption curve. This makes it clear the importance of careful consideration in the nature of adsorption process and obtain a quantitative relationship between the surface covered, and the concentration of Altthbt the one hand, and the efficiency of inhibition on the other. This gives the necessary structure to explain the relationship between the degree and strength of adsorption and surface Kinatkih inhibition. We will try that we match the results with the adsorption curves and get the values of the coefficient of adsorption (the adsorption equilibrium constant), and the values of the difference in free energy and Alonthalbe Alentrobe to the process of adsorption. And without the addition of different parameters of the process of activation in the presence of corrosion inhibitor and the lack of quality will be obtained. In this project was to develop a model of the movement and thermodynamics of the inhibition of corrosion. The model to calculate the number of activity centers (1 / Y), a fixed correlation between the molecule inhibitor and the surface of the metal ((k)), as well as a fixed adhesion ((-k)), which represents the configuration of multiple layers of molecules of inhibitor on the surface of the metal and the strength of the connections between them . The damping properties were studied for the complexes:
(A) Me6 (14) 1, 4,8,11 - tetraazacyclotetradeca -4,11-diene (Me6 (14), 11-dieneN4)
(B) 1, 4, 8, 11 - tetraazacylotetradecane (cyclam)
(C) 1, 3.8. 10-tetraazaundecane (2,3,2-tet)
The erosion of the steel in a solution of sulfuric acid concentration and the Mall in one liter, when four different temperatures, namely 25, 35, 45, 55 ˚ C coefficients were calculated kinetic energy dynamics of the process of inhibition. The activity coefficients for the inhibition of this process, it has been set using the values of rate constants for the corrosion process at the temperatures of the four, in the presence of fixed concentrations of each inhibitor.
All results have shown to achieve a model kinetic and thermodynamics contriver.
In addition, the work was a comparison between the results of this model and models Almsntbt previously known, the so-called adsorption curves. For this purpose, was selected two types of curves adsorption, the two curve Adsorption known as Frumkin, and the other known as Langmuir enter the coefficient ((a)) represents the attraction of mutual between the molecules of inhibitor on the surface of the metal, while the second model, it addresses the deviation enter the coefficient ((x) ) is a ratio between the size of the inhibitor molecule and the size of a part Almadms water on the surface of the metal. The results show a good match between the model of Flory-Huggins model and kinetic - and thermodynamics. As for the Frumkin model has given a match only in a particular case, which is approaching when the value of each of the coefficients ((1 / Y)), ((x)) than or equal to one properly. Have been studied and discussed the strengths and weaknesses of these models. The results also showed the gradient in the efficiency of the three inhibitors as follows I> II> III.
Both compounds I and II giving an efficiency greater than the third compound, so as to distinguish them ring composition, which causes increase the strength of adhesion molecule inhibitor metal surface. The increase in the efficiency of the first compound to compound II Feltmisah Baudod links of the type ((TT)) inside the loop. |
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Publishing Year |
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1410 AH
1990 AD |
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Added Date |
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Wednesday, April 30, 2008 |
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Researchers
| محمد نجيب خباط | khayat, mohammed najeeb | Investigator | Doctorate | |
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