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Abstract
Totally chlorine free (TCF) bleaching has been widely applied as a response to the
environmental restrictions and the increase of market demand on chlorine-free chemical-bleached pulp. Ozone is highly reactive and reacts readily with most organic materials; therefore ozone is an attractive bleaching agent. The advantage of utilize ozone technology in the bleaching sequence is that the effluent from this process can be recycled, unlike the effluent from the chlorine-based system. The problem with ozone delignification or bleaching is the non-selectivity of ozone, which also attack cellulose and cause deterioration of pulp mechanical properties. The aim of this study was to examine the effect of ozone concentration on the bleaching to the optical and mechanical properties of the pulp. The experiment was conducted by react the acidified pulp with ozone in a rotating reactor. Caustic extraction was also added after bleaching to dissolve more lignin. From the experiments, it was found that the optical properties of pulp were improved by reaction with ozone in the bleaching. Theoretically, the lack of selectivity of ozone reaction will reduce the pulp strength after bleaching. However, in this study the tensile strength improved by the rise of ozone concentration.
Kata Kunci : ozone bleaching, pulping, chemical