A1 Journal article (refereed), original research

Novel chromatographic process for the recovery and purification of hydroxy acids from alkaline spent pulping liquors

Open Access publication

Publication Details

Authors: Heinonen Jari, Sainio Tuomo

Publisher: Elsevier

Publication year: 2018

Language: English

Related journal or series: Chemical Engineering Science

Journal acronym: CES

Volume number: 197

Start page: 87

End page: 97

Number of pages: 11

ISSN: 0009-2509

eISSN: 1873-4405

JUFO level of this publication: 2

Digital Object Identifier (DOI): http://dx.doi.org/10.1016/j.ces.2018.12.013

Permanent website address: https://www.sciencedirect.com/science/article/pii/S0009250918308601?via=ihub

Open Access: Open Access publication

Location of the parallel saved publication: URN:NBN:fi-fe201903269951


In this study, an efficient sequential chromatographic process for
recovering hydroxy acids (HAs) from soda and kraft black liquors (BLs)
has been developed. Lignin and pulping chemicals are also recovered and
can be recycled back to the pulping process. A weak cation exchange
resin in Na+ form separates lignin from BL. Up to 95% lignin
yield was obtained, with over 50% yield for HAs as Na salts. A
cellulose-based resin is used to separate HAs from NaOH. Complete
separation, and thus 100% yield for HAs and NaOH, was achieved. The HAs
in soda BL are liberated by ion exchange. In case of kraft BL, the
solution is acidified with H2SO4 and subjected to
ion exchange and ion exclusion chromatography to recover the remaining
pulping chemicals. It was found that fouling, which limits the
efficiency of membrane-based processing of BLs, is avoided with the
appropriate choice of chromatographic separation materials.

Last updated on 2019-11-10 at 07:39