Effects of pre-hydrolysis applied before kraft-based pulp production on the chemical composition of Black poplar (Populus nigra L.) wood particles

Öz

Pre-hydrolysis is recognized as the high temperature treatment of wood particles to remove hemicelluloses prior to kraft pulp production. In this study, black poplar (Populus nigra L.) particles were pre-hydrolyzed with hot water at 170 °C for 5, 10, 15, 20, 30 and 50 minutes, and the changes in the chemical composition of the particles were investigated. Pre-hydrolysis increased the α-cellulose and extractive contents of the particles, while decreasing the contents of lignin, holocellulose and hemicellulose. It was observed that hemicelluloses decreased rapidly in the first minutes of the pre-hydrolysis process. A significant decrease was detected in the amount of xylose, mannose and galactose from hemicellulose units during the pre-hydrolysis process. Minor changes occurred in the content of arabinose. Galactose left the particles in the fifteenth minute of the pre-hydrolysis, and rhamnose in the first minutes. It has been observed that the optimum hydrolysis time with hot water can be thirty minutes since it removes 78.43% of hemicelluloses from the black poplar particles at 170 °C and increases the α-cellulose ratio by 18.71%.

Anahtar Kelimeler

• Black poplar
• Pre-hydrolysis
• Cellulose
• Hemicellulose

Kraft bazlı kağıt hamuru üretimi öncesinde uygulanan ön hidrolizin Karakavak (Populus nigra L.) odunu yongalarının kimyasal bileşimi üzerine etkileri

Öz

Ön hidroliz, kraft kağıt hamuru üretiminden önce hemiselülozların uzaklaştırılması için odun yongalarının yüksek sıcaklıkta işleme tabi tutulması olarak tanınmaktadır. Bu çalışmada, Karakavak (Populus nigra L.) yongalarına 5, 10, 15, 20, 30 ve 50 dakika boyunca 170 °C'de sıcak su ile ön hidroliz uygulanmış ve ön hidrolizin yongaların kimyasal bileşiminde yarattığı değişimler incelenmiştir. Ön hidroliz, yongaların α-selüloz ve ekstraktif madde içeriklerini artırırken, lignin, holoselüloz ve hemiselüloz içeriklerini azaltmıştır. Hemiselülozların ön hidroliz işleminin ilk dakikalarında hızla azaldığı gözlenmiştir. Hemiselüloz birimlerinden ksiloz, mannoz ve galaktoz miktarlarında ön hidroliz sürecinde belirgin bir düşüş tespit edilmiştir. Arabinoz içeriğinde küçük değişiklikler gerçekleşmiştir. Galaktoz ön hidrolizin on beşinci dakikasında, ramnoz ise ilk dakikalarında yongaları terk etmiştir. 170 °C’de Karakavak yongalarından hemiselülozların %78.43’ünü uzaklaştırması ve α-selüloz oranını %18.71 artırması nedeniyle sıcak su ile en uygun hidroliz süresinin otuz dakika olabileceği görülmüştür.

Anahtar Kelimeler

• Karakavak
• Ön hidroliz
• Selüloz
• Hemiselüloz

Kaynakça

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