Computation of the Krafft Temperature Value for Aqueous Solutions of Anionic Fluorosurfactants

• Autorzy: Ryszard Zieliński

Warianty tytułu

Obliczanie temperatury Kraffta dla wodnych roztworów anionowych fluorosurfaktantów

• Języki publikacji: EN

Abstrakty

EN

The practical usefulness of using surfactants in market products is determined by their chemical structure and solubility of aqueous solutions. In practice, it is important to know the temperature above which a given surfactant is soluble in an aqueous solution. The quantitative parameter characterizing the solubility of ionic surfactants in aqueous solutions is the Krafft temperature. It is a temperature (or more precisely, a narrow temperature range) above which the solubility of a given surfactant in water increases rapidly. Knowledge of Krafft temperature of any surfactant is required to design high quality compositions of new household chemistry products and cosmetic products in which a given surfactant can be used as the active ingredient. In this paper we present results of our study on the relationship between Krafft temperature in aqueous solutions of anionic fluorosurfactants and their chemical structure. Empirical values of the Krafft temperature available in the literature for aqueous solutions of 27 anionic perfluorosurfactants were correlated with their chemical structure. We developed a set of 11 group contributions for calculating Krafft temperature values for aqueous solutions of anionic perfluorosurfactans. Krafft temperature values calculated using them for aqueous solutions of 27 anionic perfluorosurfactants were compared with experimental data. It has been shown that the newly proposed set of numerical values of the group cotributions assigned to the structural elements of perfluorosurfactants allows for the correct estimation of the Krafft temperature values in aqueous solutions for the test data set with a maximum error of 6.9°C and an mean square error of 4.1°C. (original abstract)

Praktyczną przydatnością w roztworach surfaktantów wodnych jest ich rozpuszczalność. Ilościowym parametrem charakteryzującym rozpuszczalność surfaktantów w roztworach wodnych jest temperatura Kraffta. Jest to temperatura (lub bardziej precyzyjnie, wąski zakres temperatur), powyżej której rozpuszczalność danego surfaktantu w wodzie gwałtownie wzrasta. Znajomość temperatury Kraffta dowolnego surfaktantu jest wymagana do zaprojektowania wysokiej jakości kompozycji nowych wyrobów chemii gospodarczej oraz produktów kosmetycznych, w których dany surfaktant może być stosowany jako składnik aktywny. W niniejszej pracy przedstawiono wyniki badań własnych dotyczących zależności pomiędzy temperaturą Kraffta dla anionowych fluorosurfaktantów w roztworach wodnych i ich budową chemiczną. Przeanalizowano dostępne w literaturze empiryczne wartości temperatury Kraffta dla wodnych roztworów 27 anionowych perfluorosurfaktantów i skorelowano je z ich strukturą chemiczną. Zapronowano zestaw 11 udziałów grup do obliczania wartości temperatury Kraffta dla wodnych roztworów anionowych perfluorosurfaktantów. Obliczone przy ich użyciu wartości temperatury Kraffta w roztworach wodnych dla 27 anionowych perfluorosurfaktantów porównano z danymi doświadczalnymi. Wykazano, że nowo zaproponowany zestaw wartości liczbowych udziałów przypisanych elementom strukturalnym perfluorosurfaktantów pozwala na prawidłowe oszacowanie wartości temperatury Kraffta w roztworach wodnych dla testowego zbioru danych z maksymalnym błędem 6,9°C oraz średnim błędem kwadratowym 4,1°C. (abstrakt oryginalny)

Słowa kluczowe

EN

Surfactants; Industrial commodities; Commodity research

PL

Substancje powierzchniowo czynne; Towaroznawstwo przemysłowe; Badania towaroznawcze

• Czasopismo: Towaroznawcze Problemy Jakości
• Rocznik: 2020
• Numer: nr 3
• Strony: 87--97

Twórcy

autor

Ryszard Zieliński

• Poznań University of Economics and Business

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