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2 Polish Journal of Chemical Technology

2 2019

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Ethylcellulose as a coating material in controlled-release fertilizers

Lubkowski Krzysztof, Smorowska Aleksandra, Sawicka Marta, Wróblewska Elwira, Dzienisz Alicja, Kowalska Małgorzata, Sadłowski Marcin

Polish Journal of Chemical Technology

2019

Vol. 21, nr 1

52--58

Ethylcellulose polymer was used as a coating material in the preparation of controlled release fertilizers. The materials have been prepared with the use of an immersion method. The mass ratio of polymer to fertilizer was in the range of 0.165–0.285 and the layer thickness was in the range of 204–244 μm. Mechanical properties of the prepared materials were significantly better in comparison with the initial fertilizer. Measurements of time and the degree of release of mineral components from the obtained materials were determined with a standard method. Ethylcellulose-coated materials have met the requirements of controlled release fertilizers.

Enthalpy of isopropanol adsorption on zeolite

Jabłoński Maciej, Dzienisz Alicja, Sawicka Marta, Wróblewska Elwira, Lubkowski Krzysztof, Dąbrowska Grażyna, Piz Mateusz, Sreńscek-Nazzal Joanna

Polish Journal of Chemical Technology

2019

Vol. 21, nr 4

58--65

The enthalpy of isopropanol adsorption on ZSM-5 (Zeolite Socony Mobil Framework Type MFI) was determined by the static adsorption method at the temperature range from 20°C to 100°C. Langmuir and Huttig models of equilibrium adsorption have been used to calculate the enthalpy of isopropanol adsorption at these conditions. Adsorption isotherms determined by the flow method at 20°C and 30°C have been also used in the calculations. The obtained values of isopropanol adsorption enthalpy were compared with the values of isopropanol evaporation enthalpy and with the results obtained from isopropanol and water desorption measurements with thermogravimetry and differential scanning calorimetry methods.