Open AccessCATALYTIC OZONATION OF HARDWOOD PULP
Author(s) -
Кирилл Сергеевич Мухрыгин,
V. A. Demin
Publication year - 2017
Publication title -
himiâ rastitelʹnogo syrʹâ
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.2
H-Index - 6
eISSN - 1029-5151
pISSN - 1029-5143
DOI - 10.14258/jcprm.2017041568
Subject(s) - chemistry , ozone , pulp (tooth) , hardwood , metal ions in aqueous solution , catalysis , metal , cellulose , nuclear chemistry , inorganic chemistry , organic chemistry , medicine , ecology , pathology , biology
First influence of variable valence metal ions on the ozonation process of hardwood pulp was investigated. The oxidative delignification and destruction process of hardwood pulp by ozone treatment of water suspension and ozone treatment in gas phase in the presence of ions Mn2+, Cr3+ и Fe2 by UV-spectrophotometry, IR-spectroscopy and viscosimetry methods was studied. It was showed, that addition of variable valence metal ions into the reaction mixture increased delignification depth in 1,1–1,6 times (Fe2+– Cr3+) under intensive pulp suspension mixing, and in 2,3 times (Mn2+) at insufficient mixing conditions (ozone-air mixture bubbling). The higher value of delignification depth was reached in the presence of variable valence metal ions – 39,8%. It was obtained that delignification depth was higher under the gas phase ozonation, than under the pulp suspension ozone treatment: till 62,1% without catalyst and till 67,5% in the presence of Mn2+ ions. Cellulose degradation increased with ions Mn2+, Cr3+ and Fe2+ concentration rising in the reaction mixture. Degree of polymerization varied from 1050 to 650, 720 and 800, respectively. IR-spectres of ozonated pulp are studied.