SEE CONTINUED ALKALISICAL DELEGATIONS OF LIGNOCELLULOCOLOCOMATERIALS IN TWO OR MORE STEPS WHERE THE LAST SURGERED.

摘要

This invention relates to a process for multi-stage alkaline pulping of ligno-cellulosic raw materials and recovery of delignification spent liquors, i.e. black liquor from digestion with white liquor and oxy-liquor comprising bleach plant effluent extracted from alkaline oxygen delignification of brown stock.