LOWEST EMISSIONS FROM TCF PULP PRODUCTION WITH SUPER-BATCH KRAFT PULPPROCESS

The new SuperBatch(TM) pulping process has dramatically improved the e nvironmental situation for the kraft pulp process. The main reason is the possibility to cook these softwood chips to a Kappa level of 10 an d lower without losing pulp strength. By adding an oxygen delignificat ion stage after the cooking it is possible to reach a Kappa number fro m 5-6. When using a TCF bleaching sequence afterwards the resulting wa ter emissions are very low. By adding an ozon stage to the oxygen deli gnification according to the C-free pulp(TM) technology it will be pos sible to strongly close up the whole sequence. The vision of a closed TCF kraft pulping plant with a ZP bleach sequence to full brightness a nd strength is now technically feasible with all important modules run ning today in mill scale. Air emissions of traditional kraft pulping p lants have earlier been a problem. By using the new cooking and discha rging systems of the SuperBatch process - combined with an efficient o dour collection and destruction system - these problems are minimized. These significantly better pulp strength obtained in kraft cook and t he insensitivity of the raw material makes the new SuperBatch process a possible solution in areas with strict environmental restrictions.