Abstract
In sugar industry, there is a problem of the presence of undesirable macromolecules such as pectins in sugar beet juice. Separation of these compounds is done mostly by CaO. Calcium may cause undesirable process of alkalization of soil in the near environment of the sugar factory. The theoretical basis of new juice purificatin method based on the application of Al2(SO4)3, CaSO4 and their mixtures are presented. Two model solutions of pectin (0.1 % w/w) are investigated using a method of measuring zeta potential. Pure salts Al2(SO4)3 and CaSO4, showed better binding properties with the pectin than mixtures. Amount of all studied pure salts and mixtures of Al3+ and Ca2+ ions were significantly less (142 - 710 mg/gpectin) than the average amount of CaO used in classical process (about 9 g/gpectin). Mechanism of discharge of pectin macromolecules in the presence of mixtures of these ions using a model of double electric layer are suggested.
Highlights
In sugar industry, there is a problem with the presence of undesirable macromolecules such as pectins in sugar beet juice
In accordance with the described extraction conditions, preparations of different composition and degree of esterification were obtained. These properties depend on the biological origin of raw material, sugar beet ripeness, extraction conditions and experimental procedure
The content of galacturonic acid in the tested preparations is in accordance with the mean content of pectin found in raw sugar beet juices from diffuser, reported in literature
Summary
There is a problem with the presence of undesirable macromolecules such as pectins in sugar beet juice Removal of these compounds is done mostly by CaO. Due to the large quantity of CaO (about 15 g CaO/100 g dry matter of sugar beet juice), calcium may cause undesirable process of alkalization of the soil in the proximity of sugar factory [1]. The bonding strength of Al ions with humic materials compared with divalent metal ions and the order of preference for ion binding are shown: Al3+ > > Cu2+ > Pb2+ > Cd2+ > Ca2+ [15] In accordance with this selectivity order, it is clear that applying of Al3+ will be efficient in sugar beet juice purification in relation to classical process that utilizes Ca2+ compounds [16]. In [14], studied was the influence of 100% Al2(SO4) and Al2(SO4)
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