DE19912152A1 - Solving statistic thermodynamic in group contribution method for predicting thermodynamic properties of liquid mixtures and chemical substances involves determining molecular-fragment specific activity coefficients - Google Patents
Solving statistic thermodynamic in group contribution method for predicting thermodynamic properties of liquid mixtures and chemical substances involves determining molecular-fragment specific activity coefficientsInfo
- Publication number
- DE19912152A1 DE19912152A1 DE19912152A DE19912152A DE19912152A1 DE 19912152 A1 DE19912152 A1 DE 19912152A1 DE 19912152 A DE19912152 A DE 19912152A DE 19912152 A DE19912152 A DE 19912152A DE 19912152 A1 DE19912152 A1 DE 19912152A1
- Authority
- DE
- Germany
- Prior art keywords
- thermodynamic
- group contribution
- specific activity
- liquid mixtures
- solving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
- G16C20/00—Chemoinformatics, i.e. ICT specially adapted for the handling of physicochemical or structural data of chemical particles, elements, compounds or mixtures
- G16C20/30—Prediction of properties of chemical compounds, compositions or mixtures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
- G16C20/00—Chemoinformatics, i.e. ICT specially adapted for the handling of physicochemical or structural data of chemical particles, elements, compounds or mixtures
- G16C20/10—Analysis or design of chemical reactions, syntheses or processes
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Bioinformatics & Computational Biology (AREA)
- Computing Systems (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Geometry (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Analytical Chemistry (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
Description
Gruppenbeitragsmethoden sind zur Zeit die zuverlässigsten und am weitesten verbreitetsten Methoden zur Vorausberechnung thermodynamischer Eigenschaften flüssiger Mischungen von chemischen Substanzen. Derartige Vorausberechnungen werden in der Verfahrenstechnik häufig benötigt, um bei der Planung oder Optimierung chemischer Prozesse existierende Datenlücken zu schließen. Eine gute, aktuelle Übersicht über den Stand der Technik zur Vorausberechnung thermodynamischer Eigenschaften von Mischungen wurde von Sandler gegeben [S.I.Sandler: Chemical and Engineering Thermodynamics, 3rd Edition; Wiley, New York, 1999, insbesondere 7. Kapitel] Hierin wird auch betont, daß der UNIFAC-Ansatz [Fredenslund, A.; Gmehling, J.; Rasmussen, P.: Vapor Liquid Equilibria Using UNIFAC, Elsevier: Amsterdam, 1977] unter den Gruppenbeitragsmethoden die größte Bedeutung hat.Group contribution methods are currently the most reliable and widely used methods for predicting thermodynamic properties of liquid mixtures of chemical substances. Such advance calculations are often required in process engineering to close existing data gaps when planning or optimizing chemical processes. A good overview of the current state of the art of predicting thermodynamic properties of mixtures was given by Sandler [SISandler: Chemical and Engineering Thermodynamics, 3rd Edition; Wiley, New York, 1999, especially Chapter 7] It also emphasizes that the UNIFAC approach [Fredenslund, A .; Gmehling, J .; Rasmussen, P .: Vapor Liquid Equilibria Using UNIFAC, Elsevier: Amsterdam, 1977] has the greatest importance among the group contribution methods.
Der gemeinsame Kerngedanke aller Gruppenbeitragsmethoden ist die Annahme, daß sich die Wechselwirkungen in einer flüssigen Mischung von Molekülen als Summe von Paarwechselwirkungen von vordefinierten Molekülfragmenten (im folgenden als "Gruppen" bezeichnet), also als Gruppenbeiträge, darstellen lassen. Der Parametersatz der Gruppenbeiträge akl zwischen je zwei Gruppen vom Typ k und l wurde in einem aufwendigen Verfahren an experimentelle Daten angepaßt und liegt als Tabelle der jeweiligen Gruppenbeitragsmethode zugrunde. Dabei ist zu beachten, daß im Laufe der letzten 25 Jahre selbst für das UNIFAC-Verfahren mehrere Parametersätze entwickelt wurden, die jeweils unter etwas anderen Gesichtspunkten optimiert wurden.The common core idea of all group contribution methods is the assumption that the interactions in a liquid mixture of molecules can be represented as the sum of pair interactions of predefined molecular fragments (hereinafter referred to as "groups"), ie as group contributions. The parameter set of the group contributions a kl between two groups of the type k and l was adapted to experimental data in a complex process and is based on the table of the respective group contribution method. It should be noted that over the past 25 years, even for the UNIFAC process, several parameter sets have been developed, each of which has been optimized under slightly different criteria.
Neben anderen Problemen, die aus den Grundannahmen der Gruppenbeitragsmethoden
herrühren, resultieren in alle Gruppenbeitragmethoden zusätzliche Fehler aus der
näherungsweisen Lösung der statistischen Thermodynamik für das System wechselwirkender
Gruppen. Diese Fehler machen sich besonderes bei sehr starken Wechselwirkungen von
Gruppen bemerkbar, die nur in geringer Konzentration in der Mischung vorkommen. In der
Notation von UNIFAC wird die statistische Thermodynamik in Form folgender Gleichung für
den spezifischen Aktivitätskoeffizienten Γk einer Gruppe k in der Mischung abgehandelt:
In addition to other problems resulting from the basic assumptions of the group contribution methods, additional errors result from the approximate solution of statistical thermodynamics for the system of interacting groups in all group contribution methods. These errors are particularly noticeable in the case of very strong interactions between groups that only occur in a low concentration in the mixture. In UNIFAC notation, statistical thermodynamics is dealt with in the form of the following equation for the specific activity coefficient Γ k of a group k in the mixture:
ln dieser Gleichung bedeuten:
In this equation:
- - In den natürlichen Logarithmus- In the natural log
- - Qi die spezifische Oberfläche einer Gruppe i- Q i the specific surface area of a group i
- - Θi den Oberflächenanteil einer Gruppe i an der gesamten Moleküloberfläche in der Mischung- Θ i is the surface fraction of a group i in the total molecular surface in the mixture
- - Ψi,j = exp{-aij/T}- Ψ i, j = exp {-a ij / T}
- - exp die Exponential-Funktion- exp the exponential function
- - T die absolute Temperatur in Kelvin- T is the absolute temperature in Kelvin
Die Summenindices m und n laufen dabei über alle in der Mischung vertretenen Gruppen.The sum indices m and n run over all groups represented in the mixture.
Aus einer völlig anderen Richtung kommend hat A. Klamt eine Methode zur Berechnung thermodynamischer Eigenschaften von flüssigen Mischungen (COSMO-RS) auf der Basis quantenchemischer Rechnungen vorgeschlagen, die ohne die Zerlegung der Moleküle in Gruppen auskommt [A. Klamt, Journal of Physical Chemistry, 1995, 99, S. 2224 ff]. In dieser Methode, die wie die Gruppenbeitragsmethoden von der Annahme wechselwirkender Molekül-Oberflächensegmente ausgeht, führt Klamt auch eine neuartige exakte Lösung für die statistische Thermodynamik des von ihm betrachteten Ensembles wechselwirkender Oberflächensegmente ein, bei der die spezifische Aktivität bestimmter Oberflächensegmente iterativ und selbstkonsistent aus der Kenntnis der Oberflächenzusammensetzung der Mischung, der spezifischen Wechselwirkungsenergien unterschiedlicher Oberflächensegmente, und der spezifischen Aktivität der übrigen Oberflächensegmente berechnet wird. Es wird gezeigt, daß diese Gleichung zu einer sehr schnellen und vor allem exakten Lösung der statistischen Thermodynamik des betrachteten Systems führt.Coming from a completely different direction, A. Klamt has a method of calculation thermodynamic properties of liquid mixtures (COSMO-RS) based quantum chemical calculations proposed without breaking down the molecules into Groups get along [A. Klamt, Journal of Physical Chemistry, 1995, 99, p. 2224 ff]. In this Method that, like the group contribution methods, is more interactive from the assumption Molecule surface segments runs out, Klamt also leads a new kind of exact solution for the statistical thermodynamics of the ensemble considered by him are more interactive Surface segments where the specific activity of certain surface segments iterative and self-consistent from knowledge of the surface composition of the Mixture, the specific interaction energies of different surface segments, and the specific activity of the remaining surface segments is calculated. It will demonstrated that this equation leads to a very quick and, above all, exact solution of the statistical thermodynamics of the system under consideration.
Eine genaue Analyse der Analogien und Unterschiede zwischen den Gruppenbeitrags
methoden und COSMO-RS zeigt, daß sich der Grundgedanke der iterativ selbstkonsistenten
Lösung aus COSMO-RS auf die Gruppenbeitragsmethoden, insbesondere auch auf UNIFAC,
übertragen läßt. Diese Übertragung, die in der Notation von UNIFAC die Form
A precise analysis of the analogies and differences between the group contribution methods and COSMO-RS shows that the basic idea of the iteratively self-consistent solution from COSMO-RS can be applied to the group contribution methods, especially to UNIFAC. This transfer, which in the notation of UNIFAC the form
anstelle von Gleichung 1) annimmt, löst damit die aus den Näherungen bei der statistischen Thermodynamik in den Gruppenbeitragsmethoden auftretenden Probleme und stellt den oben genannten Patentanspruch dar.instead of equation 1), it triggers the approximation of the statistical Thermodynamics problems in group contribution methods and presents the above mentioned claim.
Die mit dieser Erfindung erzielbaren Vorteile bestehen insbesondere darin, daß der Anwendungsbereich von Gruppenbeitragsmethoden auch auf Systeme mit sehr starken Wechselwirkungen von Gruppen, die in geringen Konzentrationen vorkommen, ausgedehnt werden kann. Des weiteren ist davon auszugehen, daß die Vermeidung von Näherungen in der statistischen Thermodynamik auch schon im Bereich mittelstarker Wechselwirkungen zu deutlichen Verbesserungen bei der Vorhersagegenauigkeit führen werden. Es ist allerdings davon auszugehen, daß sich die aus der Erfindung hervorgehenden Vorteile der erst durch eine Neuparametrisierung der Gruppenbeitragsmethoden realisieren lassen, da die alten Parametersätze im Zusammenspiel mit der alten, näherungsweisen Lösung der statistischen Thermodynamik optimiert wurden. Aus diesem Grund kann derzeit weder der erzielbare Nutzen quantifiziert, noch kein Anwendungsbeispiel dargestellt werden.The advantages that can be achieved with this invention are in particular that the Scope of application of group contribution methods also to systems with very strong ones Interactions of groups that occur in low concentrations, expanded can be. Furthermore, it can be assumed that the avoidance of approximations in statistical thermodynamics even in the area of moderate interactions will lead to significant improvements in prediction accuracy. However, it is assume that the advantages arising from the invention of the first have a new parameterization of the group contribution methods implemented, as the old ones Parameter sets in interaction with the old, approximate solution of the statistical Thermodynamics were optimized. For this reason, neither the achievable Benefit quantified, no application example can be presented.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19912152A DE19912152A1 (en) | 1999-03-18 | 1999-03-18 | Solving statistic thermodynamic in group contribution method for predicting thermodynamic properties of liquid mixtures and chemical substances involves determining molecular-fragment specific activity coefficients |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19912152A DE19912152A1 (en) | 1999-03-18 | 1999-03-18 | Solving statistic thermodynamic in group contribution method for predicting thermodynamic properties of liquid mixtures and chemical substances involves determining molecular-fragment specific activity coefficients |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19912152A1 true DE19912152A1 (en) | 2000-09-21 |
Family
ID=7901471
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19912152A Withdrawn DE19912152A1 (en) | 1999-03-18 | 1999-03-18 | Solving statistic thermodynamic in group contribution method for predicting thermodynamic properties of liquid mixtures and chemical substances involves determining molecular-fragment specific activity coefficients |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE19912152A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002051375A1 (en) * | 2000-12-27 | 2002-07-04 | Haarmann & Reimer Gmbh | Selection method for odorous substances |
WO2002051359A1 (en) * | 2000-12-27 | 2002-07-04 | Haarmann & Reimer Gmbh | Method for selecting cosmetic adjuvants |
WO2002051263A1 (en) * | 2000-12-27 | 2002-07-04 | Haarmann & Reimer Gmbh | Selection method for aromatic substances |
-
1999
- 1999-03-18 DE DE19912152A patent/DE19912152A1/en not_active Withdrawn
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002051375A1 (en) * | 2000-12-27 | 2002-07-04 | Haarmann & Reimer Gmbh | Selection method for odorous substances |
WO2002051359A1 (en) * | 2000-12-27 | 2002-07-04 | Haarmann & Reimer Gmbh | Method for selecting cosmetic adjuvants |
WO2002051263A1 (en) * | 2000-12-27 | 2002-07-04 | Haarmann & Reimer Gmbh | Selection method for aromatic substances |
US6741954B2 (en) | 2000-12-27 | 2004-05-25 | Symrise Gmbh & Co. Kg | Selection method for odorants |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
Andersen et al. | Early administration of epinephrine (adrenaline) in patients with cardiac arrest with initial shockable rhythm in hospital: propensity score matched analysis | |
EP2578702A1 (en) | System and method for correcting primer extension errors in nucleic acid sequence data | |
Moreno et al. | Internal validation of the DNAscan/ANDE™ Rapid DNA Analysis™ platform and its associated PowerPlex® 16 high content DNA biochip cassette for use as an expert system with reference buccal swabs | |
Mead-Briggs | The effect of temperature upon the permeability to water of arthropod cuticles | |
DE19912152A1 (en) | Solving statistic thermodynamic in group contribution method for predicting thermodynamic properties of liquid mixtures and chemical substances involves determining molecular-fragment specific activity coefficients | |
Kedwards et al. | Community level analysis of ecotoxicological field studies: II. Replicated‐design studies | |
WO2010083811A1 (en) | Method for identifying in particular unknown substances by mass spectrometry | |
DE2837529C2 (en) | Process for the purification of nitrosamine-containing dinitroanilines | |
Ma et al. | Different facets of bacterial and fungal communities drive soil multifunctionality in grasslands spanning a 3500 km transect | |
Cai et al. | Development of Abraham model correlations for solute transfer into cyclopentanol from both water and the gas phase based on measured solubility ratios | |
DE102010045491B4 (en) | Method for detecting macromolecular organic silicon compounds and device therefor | |
DE10146901A1 (en) | Method and system for processing error hypotheses | |
DE112013002565T5 (en) | Minimization of information content data by using a hierarchy of reference genomes | |
Stevens et al. | Stochastic relations between species richness and the variability of species composition | |
Teppola et al. | Kalman filter for updating the coefficients of regression models. A case study from an activated sludge waste-water treatment plant | |
Zhang et al. | Rubber stoppers as sources of contaminants in electrospray analysis of peptides and proteins | |
Mangiacotti et al. | Protein–lipid association in lizard chemical signals | |
CN110956313A (en) | Method for predicting distribution coefficient between plant cuticle and water of organic pollutant | |
Kowalski et al. | Modifications of the optical potential formalism arising from the pauli principle | |
EP2977912A1 (en) | Automated diagnosis | |
DE895151C (en) | Process for the production of chloromethyl sulfides | |
Vasquez et al. | Effect of data type on thermodynamic model parameter estimation: A Monte Carlo approach | |
Lansky | Strategic Bioassay Design, Development, Analysis, and Validation 1 | |
Bruning et al. | Absolute vs. comparative end-of-life age | |
Kumskov et al. | Automatic formation method for structural descriptors of organic compounds for quantitative structure—property relationships |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
8181 | Inventor (new situation) |
Free format text: ERFINDER IST ANMELDER |
|
8110 | Request for examination paragraph 44 | ||
8130 | Withdrawal |