Application of weakly basic copolymer polyacrylamide (acrylamide-CO-N,N′-dimethylaminoethyl methacrylate) gels in the recovery of citric acid .

  1. González-Sáiz, J.M. 1
  2. Fernández-Torroba, M.A. 1
  3. Pizarro, C. 1
  1. 1 Universidad de La Rioja
    info

    Universidad de La Rioja

    Logroño, España

    ROR https://ror.org/0553yr311

Revista:
European Polymer Journal

ISSN: 0014-3057

Año de publicación: 1997

Volumen: 33

Número: 4

Páginas: 475-485

Tipo: Artículo

SCOPUS: 2-s2.0-0040561271 WoS: WOS:A1997XA44500009 GOOGLE SCHOLAR

Otras publicaciones en: European Polymer Journal

Repositorio institucional: lock_openAcceso abierto Editor

Resumen

We have successfully used different crosslinked copolymer polyacrylamide gels with a variable amount of cationic copolymer, N,N-dimethylaminoethyl methacrylate (DMA), to concentrate solutions of citric acid. Gel-swelling behaviour was studied as a function of crosslinker density, monomer concentration (gel structure) and percentage of ionizable monomer (degree of gel ionization). Using experimental design, response surfaces of the swelling ratio as a function of gel composition were calculated. The results obtained were in good agreement with other experimental data as well as with the Flory-Huggins theory for ionic gels. The recovery efficacy was a function of pH, ionic strength and percentage of ionizable monomer. © 1997 Elsevier Science Ltd. All rights reserved.