New apparatus for simultaneous determination of phase equilibria and rheological properties of fluids at high pressures: Its application to coal pastes studies up to 773 K and 30 MPa

1986 ◽  
Vol 57 (6) ◽  
pp. 1192-1195 ◽  
Author(s):  
Albert Cohen ◽  
Dominique Richon
Keyword(s):  
Phase Equilibria ◽  
Rheological Properties ◽  
Simultaneous Determination ◽  
High Pressures ◽  
New Apparatus

Simultaneous Determination of Electrical and Rheological Properties of Polypropylene Filled with Carbon Nanotubes

2008 ◽  
Author(s):  
Christian Triebel ◽  
Joachim Kaschta ◽  
Nikolaos Katsikis ◽  
Helmut Münstedt ◽  
Andreas Funck ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Rheological Properties ◽  
Simultaneous Determination

A Corresponding States Correlation for Calculating Gas-Condensate Phase Equilibria

1968 ◽  
Vol 8 (03) ◽  
pp. 281-292 ◽  
Author(s):  
Alan S. Emanuel
Keyword(s):  
Phase Equilibria ◽  
Phase Behavior ◽  
High Pressures ◽  
Experimental Studies ◽  
Corresponding States ◽  
Gas Condensate ◽  
Reference Substance ◽  
K Value ◽  
Reservoir Conditions

Abstract A correlation has been developed for calculating the phase behavior of gas-condensate systems at reservoir conditions. The correlation is based on the principle of corresponding states and has been coded for an IBM 7094. Experimental K-values were determined for several gas-condensate systems at reservoir conditions to evaluate various semiempirical parameters of the correlation. The approximate range of application of the correlation is 150 to 300F and 1,500 to 6,000 psi. Introduction The rapid development of digital computers during the past several years has made feasible the calculation of hydrocarbon phase behavior by methods based on rigorous thermodynamic principles. Good correlations have been developed for low to moderate pressures, but these techniques have not yet been extended successfully to reservoir fluids at high pressures. Consequently, the determination of phase behavior of oil and gas systems at reservoir conditions is still based almost entirely on generalized data correlations or on experimental studies of the fluid in question. While these methods have been used successfully many times, they do have inherent limitations that restrict their applicability. Generalized correlations, such as the NGSMA K-charts, are limited to the range of pressure, temperature and components for which pressure, temperature and components for which the data were determined. The accuracy of these correlations is often questionable because the effect of total system composition is not well defined. Experimental studies offer a reliable method for determining phase behavior, but usually the studies are costly and time consuming. Recently, Leland and coworkers presented a new approach to calculating phase behavior from the principles of corresponding states. Corresponding states methods determine the thermodynamics properties of a given system by comparison with a reference substance whose properties are known. The accuracy of data properties are known. The accuracy of data approach depends on close chemical and structural similarity between the reference substance and the system in question and between components within the system itself. For high accuracy, it is usually necessary to correct for chemical and structural dissimilarities. In principle, however, the corresponding states method should be no less accurate at high pressures than at low pressures, provided reference substance properties are known. provided reference substance properties are known. This paper describes an empirical modification of the basic correlation proposed by Leland, et al. for the specific purpose of calculating the phase behavior of gas-condensate fluids at reservoir conditions. The modified correlation, which has been Programmed for an IBM 7094, may be used for either approximate or precise determination of fluid behavior depending on the amount of analytical and, experimental data available for the system. BASIC THEORY The basic theory of the corresponding states phase equilibria correlation was first published by phase equilibria correlation was first published by Leland, Chappelear and Gamson. Subsequently, Leland, Chappelear and Leach published methods for improving me accuracy of the original theory. The aim of the correlation is to calculate the K-value of each component of a given system as a function of pressure, temperature, and over-all composition, where ..........................................(1) Once the K-values are known, the phase behavior may be determined directly by an appropriate flash calculation. The basic equation for calculating component K-values was taken from the work of Joffe. For any component i of a mixture, the K-value is given by ..........................................(2) SPEJ P. 281

An experimental determination of the melting curves of argon and nitrogen into the 10000 atm region

1954 ◽  
Vol 225 (1162) ◽  
pp. 393-405 ◽  
Keyword(s):  
Low Temperatures ◽  
Room Temperature ◽  
Small Volume ◽  
High Pressures ◽  
Steel Tube ◽  
Melting Curves ◽  
New Apparatus ◽  
Very High ◽  
Small Steel

A new apparatus for measuring melting curves at low temperatures and very high pressures is described. It is essentially a combined cryostat and high-pressure intensifier connected by a single junction at room temperature. The pressure is produced in a number of stages culminating in a single intensification stroke on to a small volume of gas maintained at low temperatures in a long steel tube. Solidification and melting are detected in this tube by means of a small steel pellet, which may be moved by an external magnetiċ field when the substance is fluid. Experiments have been carried out on argon and nitrogen. The solid-fluid equilibrium line has been extended to 8250 atm at 234° K for argon, and to 9100 atm at 180° K for nitrogen.

Simultaneous determination of the electronic and chemical structures in CeNixCu5-xat high pressures

2001 ◽  
Vol 13 (50) ◽  
pp. 11511-11518 ◽  
Author(s):  
U Staub ◽  
C Schulze-Briese ◽  
P A Alekseev ◽  
M Hanfland ◽  
S Pascarelli ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
High Pressures ◽  
Chemical Structures

Experimental Determination of CCl4 Hydrate Phase Equilibria up to High Pressures

2014 ◽  
Vol 60 (2) ◽  
pp. 398-402 ◽  
Author(s):  
Alireza Shariati ◽  
Geert H. Lameris ◽  
Cor J. Peters
Keyword(s):  
Phase Equilibria ◽  
Experimental Determination ◽  
High Pressures ◽  
Hydrate Phase

A general computer program for the extended plate overlap algorithm

1978 ◽  
Vol 48 ◽  
pp. 287-293 ◽  
Author(s):  
Chr. de Vegt ◽  
E. Ebner ◽  
K. von der Heide
Keyword(s):  
Computer Program ◽  
Simultaneous Determination ◽  
General Computer Program ◽  
General Computer

In contrast to the adjustment of single plates a block adjustment is a simultaneous determination of all unknowns associated with many overlapping plates (star positions and plate constants etc. ) by one large adjustment. This plate overlap technique was introduced by Eichhorn and reviewed by Googe et. al. The author now has developed a set of computer programmes which allows the adjustment of any set of contemporaneous overlapping plates. There is in principle no limit for the number of plates, the number of stars, the number of individual plate constants for each plate, and for the overlapping factor.

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