Purification process for recovering hydroxy acids from soda black liquor

Sanna Hellstén, Jussi Lahti, Jari Heinonen, Mari Kallioinen, Mika Mänttäri, Tuomo Sainio*

*Tämän työn vastaava kirjoittaja

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

27 Sitaatiot (Scopus)

Abstrakti

Black liquor, a side product of chemical pulping, contains hydroxy acids that have many potential applications, e.g., as polymer precursors. Currently there are no feasible separation processes available for recovery of hydroxy acids from such solutions. Neutralization is usually though to be a necessary pre-treatment, but it adds into chemical consumption and may impede the integration of the recovery process to a pulp mill. In this work, an experimental investigation of a new process concept for the recovery and purification of hydroxy acids from soda black liquor without neutralization is presented. The process consists of ultrafiltration, size-exclusion chromatography, ion-exchange, adsorption, and evaporation. Mixtures of hydroxy acids in high purity were produced from black liquor of soda pulping using the process. A reduction of 99% in lignin content of the organic acid fraction was achieved. In the chromatographic separation step, the recovery of sodium hydroxide was almost 100%. The average purities of hydroxy acids isolated from softwood and hardwood black liquors were 81% and 63% on mass basis, respectively.

AlkuperäiskieliEnglanti
Sivut2765-2774
Sivumäärä10
JulkaisuChemical Engineering Research and Design
Vuosikerta91
Numero12
DOI - pysyväislinkit
TilaJulkaistu - joulukuuta 2013
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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