Novel chromatographic process for the recovery and purification of hydroxy acids from alkaline spent pulping liquors
| Autor: | Jari Heinonen, Tuomo Sainio |
|---|---|
| Přispěvatelé: | Lappeenrannan-Lahden teknillinen yliopisto LUT, Lappeenranta-Lahti University of Technology LUT, fi=School of Engineering Science|en=School of Engineering Science |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
General Chemical Engineering
Chromatographic separation 02 engineering and technology Lignin Industrial and Manufacturing Engineering chemistry.chemical_compound 020401 chemical engineering Hydroxy carboxylic acids 0204 chemical engineering Cellulose Ion-exchange resin Chromatography Ion exchange Fouling Applied Mathematics food and beverages General Chemistry 021001 nanoscience & nanotechnology chemistry Yield (chemistry) Pulping chemicals 0210 nano-technology Black liquor Kraft paper |
| Popis: | 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. Post-print / Final draft |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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