Rapid and selective catalytic oxidation of hexenuronic acid and lignin in cellulosic fibers

N.K. Chenna (Corresponding Author), Anna-Stiina Jääskeläinen, T. Vuorinen

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

Processes called pulping and bleaching are required for preparing industrial scale pure cellulose from biomass. Bleaching generally purifies the cellulose from components called hexenuronic acid (HexA) and lignin. Nevertheless, the oxidation reactions of these bleachable components generally consume stoichiometric volumes of oxidant and hours of retention time. The efficiency of the oxidants can be enhanced by catalysis. The present study focuses on increasing the selectivity of hypochlorous acid (HOCl) produced during chlorine dioxide bleaching toward oxidation of HexA and lignin with the help of a tertiary amine as a catalyst. A strong electrophile forms when HOCl reacts with tertiary amine, which further reacts selectively and efficiently with HexA and lignin. Catalytic oxidation experiments were conducted at broad range of pH, temperature, and oxidant dosage in conditions that are milder than used today in industry. Surprisingly, catalytic amounts of industrial tertiary amine were used, and the oxidation reactions took place in seconds. This study opens the door for future chemical pulp bleaching technologies with reduced oxidation time, less chemical consumption, and high chemical oxidation efficiency.
Original languageEnglish
Pages (from-to)17744-17749
Number of pages5
JournalIndustrial & Engineering Chemistry Research
Volume52
Issue number50
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

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Lignin
Catalytic oxidation
Bleaching
Oxidation
Oxidants
Acids
Fibers
Amines
Hypochlorous Acid
Cellulose
Chemical pulp
Chlorine
Catalysis
Biomass
hexenuronic acid
Catalysts
Industry
Experiments
Temperature

Cite this

Chenna, N.K. ; Jääskeläinen, Anna-Stiina ; Vuorinen, T. / Rapid and selective catalytic oxidation of hexenuronic acid and lignin in cellulosic fibers. In: Industrial & Engineering Chemistry Research. 2013 ; Vol. 52, No. 50. pp. 17744-17749.
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abstract = "Processes called pulping and bleaching are required for preparing industrial scale pure cellulose from biomass. Bleaching generally purifies the cellulose from components called hexenuronic acid (HexA) and lignin. Nevertheless, the oxidation reactions of these bleachable components generally consume stoichiometric volumes of oxidant and hours of retention time. The efficiency of the oxidants can be enhanced by catalysis. The present study focuses on increasing the selectivity of hypochlorous acid (HOCl) produced during chlorine dioxide bleaching toward oxidation of HexA and lignin with the help of a tertiary amine as a catalyst. A strong electrophile forms when HOCl reacts with tertiary amine, which further reacts selectively and efficiently with HexA and lignin. Catalytic oxidation experiments were conducted at broad range of pH, temperature, and oxidant dosage in conditions that are milder than used today in industry. Surprisingly, catalytic amounts of industrial tertiary amine were used, and the oxidation reactions took place in seconds. This study opens the door for future chemical pulp bleaching technologies with reduced oxidation time, less chemical consumption, and high chemical oxidation efficiency.",
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Rapid and selective catalytic oxidation of hexenuronic acid and lignin in cellulosic fibers. / Chenna, N.K. (Corresponding Author); Jääskeläinen, Anna-Stiina; Vuorinen, T.

In: Industrial & Engineering Chemistry Research, Vol. 52, No. 50, 2013, p. 17744-17749.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Rapid and selective catalytic oxidation of hexenuronic acid and lignin in cellulosic fibers

AU - Chenna, N.K.

AU - Jääskeläinen, Anna-Stiina

AU - Vuorinen, T.

PY - 2013

Y1 - 2013

N2 - Processes called pulping and bleaching are required for preparing industrial scale pure cellulose from biomass. Bleaching generally purifies the cellulose from components called hexenuronic acid (HexA) and lignin. Nevertheless, the oxidation reactions of these bleachable components generally consume stoichiometric volumes of oxidant and hours of retention time. The efficiency of the oxidants can be enhanced by catalysis. The present study focuses on increasing the selectivity of hypochlorous acid (HOCl) produced during chlorine dioxide bleaching toward oxidation of HexA and lignin with the help of a tertiary amine as a catalyst. A strong electrophile forms when HOCl reacts with tertiary amine, which further reacts selectively and efficiently with HexA and lignin. Catalytic oxidation experiments were conducted at broad range of pH, temperature, and oxidant dosage in conditions that are milder than used today in industry. Surprisingly, catalytic amounts of industrial tertiary amine were used, and the oxidation reactions took place in seconds. This study opens the door for future chemical pulp bleaching technologies with reduced oxidation time, less chemical consumption, and high chemical oxidation efficiency.

AB - Processes called pulping and bleaching are required for preparing industrial scale pure cellulose from biomass. Bleaching generally purifies the cellulose from components called hexenuronic acid (HexA) and lignin. Nevertheless, the oxidation reactions of these bleachable components generally consume stoichiometric volumes of oxidant and hours of retention time. The efficiency of the oxidants can be enhanced by catalysis. The present study focuses on increasing the selectivity of hypochlorous acid (HOCl) produced during chlorine dioxide bleaching toward oxidation of HexA and lignin with the help of a tertiary amine as a catalyst. A strong electrophile forms when HOCl reacts with tertiary amine, which further reacts selectively and efficiently with HexA and lignin. Catalytic oxidation experiments were conducted at broad range of pH, temperature, and oxidant dosage in conditions that are milder than used today in industry. Surprisingly, catalytic amounts of industrial tertiary amine were used, and the oxidation reactions took place in seconds. This study opens the door for future chemical pulp bleaching technologies with reduced oxidation time, less chemical consumption, and high chemical oxidation efficiency.

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JO - Industrial & Engineering Chemistry Research

JF - Industrial & Engineering Chemistry Research

SN - 0888-5885

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