Open AccessQUICK NON-DESTRUCTIVE ANALYSIS OF CONDENSED LIGNIN BY FTIR. PART 2. PULP SAMPLES FROM ACID SULFITE COOKING
Author(s) -
Juha Fiskari,
O. Yu. Derkacheva,
Tuomas Kulomaa
Publication year - 2021
Publication title -
cellulose chemistry and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.302
H-Index - 32
eISSN - 2457-9459
pISSN - 0576-9787
DOI - 10.35812/cellulosechemtechnol.2021.55.26
Subject(s) - sulfite , lignin , pulp (tooth) , fourier transform infrared spectroscopy , kraft process , chemistry , kraft paper , softwood , black liquor , pulp and paper industry , organic chemistry , nuclear chemistry , chemical engineering , dentistry , medicine , engineering
"In our previous work, we demonstrated how lignin condensation and precipitation taking place in kraft pulping can bedetected and even quantified by Fourier Transform Infrared (FTIR) spectroscopy. Because lignin reactions in acidsulfite pulping are very different from those occurring during kraft cooking, a new analysis method is proposed torapidly analyze the condensed lignin in acid sulfite pulp. This kind of analysis is useful for sulfite pulp mills to detectthe elevated risk of black cook. This paper presents and discusses the novel method using FTIR spectroscopy to rapidlyanalyze lignin condensation in softwood pulp samples from acid sulfite processes. Several softwood pulp samples fromacid sulfite pulping at varying levels of condensation were included in this research. According to the results, FTIRspectroscopy allows indirect quantification of lignin condensation in a difficult matrix of wood constituents, such as inincompletely delignified acid sulfite pulp."