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Effect of Acid Washing Conditions on the Removal of Hexenuronic Acids from Unbleached Kraft Wheat Straw Pulp
  
DOI：10.11980/j.issn.0254-508X.2014.01.005
Key Words:wheat straw pulp  acid washing process  HexA  empirical model
Fund Project:国家自然科学基金（21076091）资助项目；教育部博士点基金（20110172110026）。
Author NameAffiliation
陈海祥1 1.华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 
戴　毅2 2.长沙理工大学化学与生物工程学院，湖南长沙，410004 
胡会超1 1.华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 
柴欣生1，* 1.华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 
王　萍2 2.长沙理工大学化学与生物工程学院，湖南长沙，410004 
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Abstract:This paper reported on the effect of the acid washing conditions (pH, time, temperature and pulp consistence) on the removal of hexenuronic acid (HexA) from unbleached kraft wheat straw pulp. The results showed that alkaline substance in the pulp had a great influence on the system with initial pH range from 3 to 5, and then affect the removal efficiency of HexA; the content of hexenuronic acid in the pulp decreased as processing time increasing; pH was the major factor affecting HexA removal, which was more efficient at pH below 3; raising the processing temperature（60～90℃） and the pulp consistence （7％～16％）could slightly promote HexA removal. An empirical model for predicting the change of hexenuronic acid content in unbleached kraft wheat straw pulp during acid washing was established, which could be used as reference for analyzing the removal of HexA from analogous wheat straw pulp in acid washing treatment.
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