EFFECT OF ADDING ADDITIVES ON THE SHAPE OF DRIFT SPECTRA ON THE OZONE BLEACHING

摘要

This work is aimed at quantification of performance of additives (1 % o.d. pulp) such as D-mannitol, salicylic acid, cationic potato starch, 2-tert-butyl-5-aminopyrimidine, zirconium (IV) propoxide, methylhydroxyethyl cellulose added ozone stage (Z) on the shape of diffuse reflectance infrared Fourier transform spectroscopy (DRIFT), spectra of ozonized pulp. The Z stage was carried out at the following conditions: 50 g oven dry pulp mass pulp, the consistency 35 %, pH 3, temperature 40°C, 4.45 1 O_2.min~(-1) oxygen flow rate, 7.563 mg O_3.1_(-1)O_2 ozone production and 0.3 % o.d. pulp ozone charge.Studies of the effects of additives on the structural change are presented. The most conspicious changes in the spectra of ozonized pulp were observed at wavenumbers 1655, 1508, 1458, 1375, 1248,1043,1092 and 899.cm~(-1).