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Optimization of Urea Peroxide Bleaching Parameters of Old Newspaper Pulp by Response Surface Methodology
  
DOI：10.11980/j.issn.0254-508X.2013.01.002
Key Words:ONP  urea peroxide  bleaching  response surface methodology
Fund Project:国家自然科学基金(21006034,31170549)；制浆造纸工程国家重点实验室开放基金(201154)。
Author NameAffiliation
张　倩 华南理工大学制浆造纸工程国家重点实验室,广东广州,510640 
付时雨 华南理工大学制浆造纸工程国家重点实验室,广东广州,510640 
李海龙* 华南理工大学制浆造纸工程国家重点实验室,广东广州,510640 
詹怀宇 华南理工大学制浆造纸工程国家重点实验室,广东广州,510640 
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Abstract:The purpose of this paper was to study the influence of various parameters on the result of old newspaper pulp (ONP) bleaching with urea peroxide and the compare urea peroxide bleaching and hydrogen peroxide bleaching. The main influence factors of urea peroxide bleaching including urea peroxide charge, temperature and reaction time were analyzed by response surface methodology. The bleaching conditions were optimized as urea peroxide dosage 12.10%, Na2SiO3 3%，MgSO4 0.05%, reaction time 120 min, temperature 80℃. At the optimal conditions, pulp brightness reached 59.8%ISO and had 12.5 points gain compared with the unbleached pulp. The brightness of urea peroxide bleached pulp was 2.6 points higher than that of the pulp bleached with hydrogen peroxide bleaching under the same condition.
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