Topic
Lydersen method
About: Lydersen method is a research topic. Over the lifetime, 7 publications have been published within this topic receiving 86 citations.
Papers
TL;DR: In this paper, a new method for calculating the critical constants using the Rackett equation is proposed, which requires the introduction of an exponential term function of the reduced temperature, which is more accurate than the original Rackett value of 2 7 in the case of high molecular weight compounds, and a trial-and-error calculation according to which all critical constants can be derived from two experimental data of density and a known Z RA value.
43 citations
TL;DR: In this article, a critical evaluation and modification of the available methods for the estimation of critical properties of pure hydrocarbons was undertaken to determine the most accurate method which has general applicability with minimum input data.
Abstract: A critical evaluation and modification of the available methods for the estimation of critical properties of pure hydrocarbons was undertaken to determine the most accurate method which has general applicability with minimum input data. As a result of the study, the method of Nokay as modified by the authors is recommended for the estimation of critical temperature while the method of Reidel is the best general method for critical volume. For critical pressure the Lydersen method is preferred for saturated hydrocarbons, while the method of Forman and Thodos is somewhat better for unsaturated hydrocarbons.
23 citations
TL;DR: It has been shown that the Lydersen method for Tc may be extended with high accuracy to complex organic compounds as mentioned in this paper, but no tests have been made for its use for calculation of Pc, Vc, and Zt.
Abstract: It has been shown that the Lydersen method for Tc may be extended with high accuracy to complex organic compounds. Earlier work in this area has shown the method to apply with lesser accuracy to organometallic and to some inorganic compounds. Suggestions for its use have been made for calculation of Pc, Vc and Zt, though no tests have been made. It has also been shown that the Lydersen method may be extended to include isotopes of elements and to compounds containing isotopes.
11 citations
TL;DR: In this article, the authors proposed a method for predicting the critical volume from the van der Waals volumes: V c = A x V vdw = 5.36 x Vvdw, where A is a universal constant.
Abstract: We propose the following method for predicting the critical volume from the van der Waals volumes: V c = A x V vdw = 5.36 x V vdw , where A is a universal constant,which can be used to predict the critical volume for a wide variety of substances: alkanes, alkenes, cycloalkanes, alcohols, carboxylic acids, amines, aromats and other. We use van der Waals volumes given in the DIPPR data compilation (Daubert and Danner, 1989). The new predictive method has been compared with two other methods: the Lydersen method (1955), and the Fedors method (1979)
9 citations
TL;DR: In this article, the critical temperatures and pressures of 213 organic compounds have been estimated using the Peng-Robinson equation of state, based on a knowledge of the van der Waals volume, normal boiling point and acentric factor of the substances.
7 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 1994 | 1 |
| 1992 | 1 |
| 1991 | 2 |
| 1990 | 1 |
| 1980 | 1 |
| 1973 | 1 |