Electrodialysis electrolyte separating and concentrating device used for ion electrolyte separating and concentrating

Abstract

The invention relates to an electrodialysis electrolyte separating and concentrating device used for ion electrolyte separating and concentrating. The device comprises a first electrode compartment (1) and a second electrode compartment (5), wherein at least one group of electrolyte separating and concentrating units is arranged between the first electrode compartment (1) and the second electrodecompartment (5); each group of the electrolyte separating and concentrating units comprises the following three compartments which are sequentially arranged: a desalination compartment (2), a first concentrating compartment (3) and a second concentrating compartment (4); the desalination compartment (2) is spaced with the adjacent first concentrating compartment (3) through an II type ion exchangefilm (10); and the first concentrating compartment (3) is spaced from the adjacent second concentrating compartment (4) through a nanofiltration membrane (11). The electrodialysis electrolyte separating and concentrating device can simultaneously achieve the purposes of selectively separating and concentrating monovalent ions and divalent ions as well as deflating the original solution; and moreover, stability of the ion exchange membranes is improved, and the problem that conventional monovalent ion exchange membrane ions cannot concentrate divalent ions, and ion flux and selectivity permeability cannot be simultaneously achieved.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to an electrodialysis mass separation and concentration device for ion mass separation and concentration. In particular, it refers to an electrodialysis mass concentration device used for mass concentration of monovalent ions and divalent ions. Background technique [0002] Electrodialysis is an electrochemical separation process that uses a direct current electric field and a selective ion exchange membrane to separate electrolyte components from a solution. It has been widely used in desalination, seawater concentration and salt production, wastewater treatment, food, pharmaceutical and biological Chemical industry and other fields. [0003] With the expansion of the application field of electrodialysis and the increase in the demand for chemical processes, especially for the separation and concentration of mixed solutions containing monovalent ions and divalent ions,...

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Problems solved by technology

However, the energy consumption of the nanofiltration process is high, the phenomenon of concentration polarization is serious, and the solution cannot be concentrated

[0005] Chinese patent 201510030196.3 relates to an electric nanofiltration device driven by an electric field, which can effectively separate monovalent ions from multivalent ions, but does not have the function of concentration, nor can it achieve desalination of the original solution

[0006] Chinese patents 201610038282.3 and 201510480899.6 involve the selective separation of monovalent chloride ions and divalent sulfate ions in wastewater, but this process is achieved through an independent nanofiltration unit, and the process is cumbersome and complicated

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