Optimized Catalytic Bleaching Sequences for Eucalyptus Kraft Pulp

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

Tutkijat

Organisaatiot

Kuvaus

Contemporary multi-stage bleaching processes partially remove residual lignin and hexenuronic acid from cellulosic pulps. The reactions in the steps could be faster and consume smaller amounts of chemicals. Catalytic bleaching (Hcat), utilizing hypochlorite (H), triethylenediamine (DABCO) and its derivative N-carboxymethyl triethylenediamine (CM-DABCO), is a new discovery that has the potential to improve the chemical and energetic efficiency of bleaching processes in chemical pulp mills, e.g. through reducing the reaction time of the bleaching processes. The objective of this study was to clarify if new kraft pulp bleaching sequences with initial stage of chlorine dioxide (ClO2; D) and an intermediate stage of Hcat could provide fully bleached pulps. The bleaching sequences of the studied eucalyptus pulps include D0E(OP)Hcat(Q)P and HcatZ/DP, which attained a final brightness of 88 and 89% ISO, respectively. HcatZ/DP showed to be the best sequence for the catalytic bleaching of eucalyptus kraft pulps. This study may open new doors to future bleaching of cellulose pulps with fewer towers and decreased use of chemicals.

Yksityiskohdat

AlkuperäiskieliEnglanti
Sivut178-186
JulkaisuJournal of Wood Chemistry and Technology
Vuosikerta39
Numero3
TilaJulkaistu - 1 tammikuuta 2019
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

ID: 32144731