Open AccessIsotermas e calor isostérico de dessorção das sementes de tungue
Author(s) -
Lílian Moreira Costa,
Osvaldo Resende,
Weder N. Ferreira,
Daniel Emanuel Cabral de Oliveira,
Igor Olacir Fernandes Silva
Publication year - 2021
Publication title -
principia/revista principia
Language(s) - English
Resource type - Journals
eISSN - 2447-9187
pISSN - 1517-0306
DOI - 10.18265/1517-0306a2021v1n54p163-171
Subject(s) - desorption , akaike information criterion , equilibrium moisture content , chemistry , water content , moisture , bayesian information criterion , mathematics , thermodynamics , horticulture , physics , statistics , organic chemistry , sorption , biology , adsorption , engineering , geotechnical engineering
The tung is a species that has potential for biodiesel production, so for safe storage there is a need to get to know its hygroscopicity. The objective of this work was to determine the desorption isotherms based on the recommendation of a mathematical model, to define the safe moisture content for storage, and to obtain the isosteric heat for the tung seeds. In order to obtain the hygroscopic equilibrium water content, the static method was used, with 20g of seeds surrounded by a permeable tissue, and placed inside the desiccators containing salt solutions, in a BOD chamber with temperatures of 20, 25, At 30 and 35 ºC, water activity ranged from 0.14 to 0.812 decimal.The Akaike information criterion (AIC) and Bayesian Schwarz information criterion (BIC) were used to adjust the mathematical models and to help choose the best one. Among the tested models, ChungPfost was elected to represent the desorption isotherms of tung seeds. Integral isosteric desorption heat values in the equilibrium moisture content range from 2.08 to 8.35 (% b.s.) ranged from 3754 to 2555 kJ kg -1