Elemental Chlorine-Free Delignification of Kraft Pulp Produced from Halfa (Stipa tenacissima)

Bouiri, B; Amrani, M

Artykuł - szczegóły

Tytuł artykułu

Elemental Chlorine-Free Delignification of Kraft Pulp Produced from Halfa (Stipa tenacissima)

Autorzy

Bouiri B , Amrani M

Wybrane pełne teksty z tego czasopisma

Identyfikatory

Warianty tytułu

Bezchlorowa delignifikacja celulozowej masy siarczanowej produkowanej z halfy (Stipa tenacissima)

Języki publikacji

Abstrakty

Halfa, also known as Stipa tenacissima, is grown in North Africa and south Spain. Due to its short fibre length, paper from halfa retains its bulk and takes block letters well. In this study halfa was evaluated for bleached pulp production. Two cellulose pulps with different chemical compositions were pulped by the conventional Kraft process. One from original halfa material and the other from halfa pretreated by diluted acid. The pulp produced from halfa pretreated with diluted acid was bleached by elemental-chlorine-free sequences DEPD and DEDP. The yield, Kappa number, brightness and α-cellulose content of the bleached and unbleached pulps were evaluated. The results show that during the chemical pulping process, the treated halfa cooked more easily than the original halfa. The treated halfa pulp also showed very good bleaching, reaching a brightness level of 94.8% ISO, a yield of 93.6% and α-cellulose content of 96.8% with the DEDP bleaching sequence as compared to an 83.2% ISO brightness level, 92.8% yield and 95.1% α – cellulose content for pulp bleached with the DEPD bleaching sequence. On the other hand, the physicalmechanical properties of the pulp were not notably reduced by the bleaching process. The breaking length, tear and burst index of the paper sheets were acceptable. Therefore, the halfa material could constitute a worthwhile choice for cellulosic fiber supply.

Halfa jest rośliną występującą w Afryce Północnej i Południowej Hiszpanii. Z powodu krótkich włókien, papier wykonany z masy celulozowej otrzymanej z tej rośliny zachowuje mięsistość i pozwala na uzyskanie dobrych wydruków. Wyprodukowano dwa rodzaje bielonej masy celulozowej o różnych składach chemicznych metodą Kraft, jeden z nieobrobionego surowca, a drugi z surowca poddanego działaniu rozcieńczonego kwasu. Masa celulozowa podana wstępnej obróbce była bielona bez udziału chloru wolnego, według schematu DEPD i DEDP. Oceniano wydajność, liczbe kappa, białość i zawartość a-celulozy dla bielonej i niebielonej masy celulozowej i stwierdzono, że poddana obróbce masa gotuje się łatwiej. Wytrzymałość mechaniczna otrzymanych z masy celulozowej arkuszy papieru była zadowalająca. Wykazano, że halfa może stanowić surowiec do produkcji papieru.

Słowa kluczowe

halfa kraft pulp bleaching chlorine dioxide prehydrolysis

halfa pakowy pulpa wybielanie dwutlenek chloru prehydrolysis

Wydawca

Sieć Badawcza Łukasiewicz - Łódzki Instytut Technologiczny

Czasopismo

Fibres & Textiles in Eastern Europe

Rocznik

2011

Tom

Vol. 19, no. 4 (87)

Strony

142--147

Opis fizyczny

Bibliogr. 46 poz., tab., wykr.

Twórcy

autor

Bouiri B

Algeria, Boumerdes, University M’ Hamed Bouguerra, Laboratory of Composite, Materials and Environment

autor

Amrani M

moussaamrani@yahoo.fr

Algeria, Boumerdes, University M’ Hamed Bouguerra, Laboratory of Composite, Materials and Environment

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Typ dokumentu

Bibliografia

Identyfikator YADDA

bwmeta1.element.baztech-cda0ab95-6826-4f98-a605-62d893aa67e9