Asit katalizatörlü organik delignifikasyon sistemleri

Geleneksel tam kimyasal kağıt üretim proseslerinde, çevre ve insanlar üzerine zararlı etkisi bulunan kükürtlü kimyasallar kullanmakta ve bu prosesler çok yüksek yatırım ve isletme maliyeti gerektirmektedir. Organik çözeltilerin tek baslarına veya diğer solventlerle karısım halinde ve asitlerin katalizatör olarak eklendiği alternatif kağıt üretim prosesleri üzerine son zamanlarda yoğun çalısmalar yapılmıstır. Asitlerin katalizatör olarak kullanıldığı organik delignifikasyon reaksiyonlarında, temel olarak ligninin polimerik yapısındaki alfa aril eter ve beta aril eter bağlarının asit hidrolizasyonu esastır. Bu çalısmada, dünya genelinde, geleneksel kimyasal metotlara alternatif olabileceği labaratuvar düzeyindeki kanıtlanmıs ve küçük ölçekli tesis düzeyinde denemeleri yapılmıs, Asam, Acetosolv, Formacell, Ester ve Milox organik delignifikasyon yöntemleri incelenmistir. Bu yöntemlerin her birisinin kendine özgü proses özellikleri bulunmaktadır. Fakat bu yöntemlerin ortak özelliği genel olarak geleneksel proseslerden daha basit ve birçok yönden avantajlı sonuçlar ortaya koymalarıdır.

Anahtar Kelimeler:

kağıt hamuru üretimi, kağıt hamuru ve kağıt sanayi, delignifikasyon, lignin, işleme, odun hamuru

Acid catalyzed organosolv delignification systems

In conventional chemical pulping processes, sulfurous chemicals have used and those have very high investment and operational costs. Many researches have been carried out for developing organic formulation mixture with acid as catalyses to develop new alternative a pulping process. Acid catalysed organasolv pulping reactions are based on depolimerization of lignin that is acid hydrolyeses of alpha and beta aryl ether linkgages. In this study, worldwide, alternative new pulping processes that have labaratory and small mill trial results success have been evaluated. In this sense, Asam, Acetosolv, Formacell, Ester ve Milox organosolv pulping processes have been studied. Each process has its own characteristics. But these are generally less complicated and have many advantages compare to conventional processes.

Keywords:

pulping, pulp and paper industry, delignification, lignin, processing, wood pulp,

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