Article ID Journal Published Year Pages File Type
4989862 Separation and Purification Technology 2017 6 Pages PDF
Abstract
In biotechnological or other applications, electrodialysis can be an efficient method for the separation of phosphate from products with relatively high molecular masses (greater than around 200 kg/kmol), even though they are electrically charged. In this work, the separation of phosphate at high initial concentration (360 mM) from glucose-1-phosphate (G-1-P, 46 mM) was investigated. Around 90% of the phosphate could be removed, while 25% of G-1-P was separated. In this case, there is no product loss because phosphate could be recycled back to the reactor. Also at low concentrations (CP ∼ 22 mM), 77% of phosphate and only 20% of G-1-P, (CG-1-P ∼ 30 mM) were removed. The efficiency can be substantially improved with a two-step electrodialysis. The molar phosphate fluxes were considerably higher than the G-1-P (from around 4 to 40 times) at phosphate to G-1-P concentration ratios from 0.7 to 7. A theoretical consideration shows that this can be first of all attributed to a rather low mobility of G-1-P in the membrane matrix. The mobility of such substances in ion-exchange membranes depends also significantly on concentration.
Related Topics
Physical Sciences and Engineering Chemical Engineering Filtration and Separation
Authors
, , , ,