Dynamic and regeneration study of ion exchange method for removal of metal ion impurities from NMP waste liquor

2026-04-22

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Lijuan Liu

Yanlong He

Pu Chen

Dongqiang Zhang *

DOI：10.1016/j.cjche.2026.03.020

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• T-42H macroporous cation exchange resin effectively removes metal ions from NMP. • Optimal conditions: 5 ml·min–1 flow rate, 15 cm column height, two-stage cyclic adsorption. • Best regeneration: HCl 1 mol·L–1 at 10 ml·min–1 flow rate ensured high reusability. • Conductivity remained ≤1.13 μS·cm–1 after six adsorption-regeneration cycles. • Results show resin meets industrial demands for high-purity NMP recovery.

Keywords:

T-42H macroporous cation exchange resin

metal ion removal

NMP waste liquor

ion exchange

regeneration

adsorption cycles

Dynamic and regeneration study of ion exchange method for removal of metal ion impurities from NMP waste liquor

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