电渗析
柠檬酸
水溶液
化学
吨
柠檬酸钠
钠
制浆造纸工业
生物化学
工程类
膜
有机化学
医学
病理
作者
Mauro Moresi,Fabiana Sappino
标识
DOI:10.1016/s0260-8774(98)00012-0
摘要
In this work, the optimal operating conditions (pH and current density) for citric acid recovery from aqueous solutions via electrodialysis (ED) were determined by balancing the investment and maintenance costs against the energy costs. By referring to a series of industrial-scale ED plants, the specific recovery costs (co) were found to be dependent on plant capacity (Qp), current density (j) and specific costs of solute (cs) and electric energy (cee). For a plant size of 2500 metric tons per year, fed with aqueous solutions containing 100 g/ dm3 of citric acid at pH ranging from 3 to 7, and for cee = Lit 100/kWh and cs = Lit 2000/kg, the ED recovery of mono-, di-, or tri-sodium citrates would cost Lit 1900/kg, Lit 774/kg, or Lit 565/kg, respectively, thus showing that citric acid can be more economically separated from clarified fermentation broths by ED once converted into the tri-sodium salt.
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