Electrodialytic separation of boric and hydrochloric acids

Regeneration of boron-selective sorbents produces the acidic effluents of high boron content. Electrodialysis was proposed as a method for hydrochloric acid regeneration from the effluents composed of 0.1kmol/m3 hydrochloric acid and boric acid concentration ranging from 0.1 to 2.5kgB/m3. Boric acid...

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Published in:Desalination 2014-06, Vol.342, p.29-34
Main Authors: Białek, R., Mitko, K., Dydo, P., Turek, M.
Format: Article
Language:English
Subjects:
Acidic effluents reuse
Boric acids
Boron removal
Effluents
Electrodialysis
Hydrochloric acid
Mass transfer
Membranes
Nernst–Planck model
Regeneration
Separation
Transport
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description Regeneration of boron-selective sorbents produces the acidic effluents of high boron content. Electrodialysis was proposed as a method for hydrochloric acid regeneration from the effluents composed of 0.1kmol/m3 hydrochloric acid and boric acid concentration ranging from 0.1 to 2.5kgB/m3. Boric acid mass transfer across anion-exchange membranes was investigated using a bench-scale electrodialyzer of an effective membrane area of 16cm2. An extended Nernst–Planck model was used for transport parameters estimation. Comparison of Neosepta AMX and ACM membranes showed that boric acid transport across the latter is much slower, allowing more effective separation of hydrochloric and boric acids. The boric acid transport in the investigated case is mainly due to diffusion of boric acid across the membrane. [Display omitted] •Acidic lyes from the boron sorbents regeneration were subjected to electrodialysis.•Boric acid can be separated from hydrochloric acid by electrodialysis.•Boric acid transport is mainly due to diffusion.•ACM membrane showed better H3BO3:HCl separation than AMX membrane.
doi_str_mv 10.1016/j.desal.2014.03.003
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source ScienceDirect Freedom Collection 2022-2024
subjects Acidic effluents reuse
Boric acids
Boron removal
Effluents
Electrodialysis
Hydrochloric acid
Mass transfer
Membranes
Nernst–Planck model
Regeneration
Separation
Transport
title Electrodialytic separation of boric and hydrochloric acids
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