2001
DOI: 10.1590/s0100-40422001000600020
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A utilização de perácidos na deslignificação e no branqueamento de polpas celulósicas

Abstract: Recebido em 18/8/00; aceito em 4/4/01 THE USE OF PERACIDS IN DELIGNIFICATION AND CELLULOSE PULP BLEACHING . Peracids are strong oxidant species and their use is being largely studied in the delignification and cellulose pulp bleaching. Some of them has already an industrial application, specially in non-conventional bleaching sequences like ECF (Elemental chlorine free) and TCF (Totally chlorine free). This review presents the main aspects of the structure, properties, preparation and reaction of peracids (per… Show more

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Cited by 69 publications
(43 citation statements)
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“…This was a very specific solution for lignin dilution and the class of peracids had been used to substitute the chlorine reagents in Elemental Clorine Free sequences and had been useful in Total Chlorine Free sequences. The oxidant potential of peracids is very high and the pulps bleached with this present good resistance, indicating low level of cellulose degradation (Brasileiro et al, 2001). The fiber cells obtained by this method presented mean length of 580µm (SD 212µm) and midline 560µm (Fig.…”
Section: Resultsmentioning
confidence: 93%
“…This was a very specific solution for lignin dilution and the class of peracids had been used to substitute the chlorine reagents in Elemental Clorine Free sequences and had been useful in Total Chlorine Free sequences. The oxidant potential of peracids is very high and the pulps bleached with this present good resistance, indicating low level of cellulose degradation (Brasileiro et al, 2001). The fiber cells obtained by this method presented mean length of 580µm (SD 212µm) and midline 560µm (Fig.…”
Section: Resultsmentioning
confidence: 93%
“…Temperaturas iniciais de degradação termooxidativa (T id ) obtidas via termogravimetria para as fibras de sisal e whiskers e conteúdo de enxofre (S) dos whiskers obtido via análise elementar. decorrente da remoção de parte de íons metálicos (na forma de sais dissolvidos) encontrados na fibra original ou mesmo incorporados devido às sucessivas lavagens e com contato com equipamentos utilizados, por exemplo, na sua moagem [21] . Os whiskers resultantes apresentaram temperatura inicial de degradação térmica inferior a das fibras.…”
Section: Caracterização Dos Whiskers De Sisalunclassified
“…Os perácidos são consumidos em reações de oxidação da lignina por decomposição espontânea e catalisadas por metais de transição durante o branqueamento (BRASILEIRO et al, 2001). …”
Section: Introductionunclassified