Peracetic acid in a combined delignification stage with ozone: From laboratory studies to mill demonstration

摘要

Peretikkahappoa käytettiin tehdasmit-takaavan TCF_Z valkaisussa parantamaan havumassan lujuusominaisuuksia. Lisäämällä peretikkahappoa massaan heti otsonoinnin jälkeen il- man välipesua osoitettiin massan re-päisylujuuden paranevan 6% vakio vetoindeksissä 70 kun massan vaaleus samanaikaisesti nousi 2,1° ISO. Valkaisussa liuenneet akkumuloitu-neet aineet eivät heikentäneet per-etikkahapon tehoa.%Peracetic acid was used in mill-scale TCF_Z bleaching to improve the strength properties of softwood kraft pulp. Treating pulp with peracetic acid after ozone treatment, without intermediate washing, improved tear strength by 6% at tensile index 70 as well as brightness by 2.1° ISO. The build-up of dissolved material in the water circulation system did not reduce the effectiveness of peracetic acid.