Pollution free pulping process using recycled wash effluent from multiple bleach stages to remove black liquor and recovering sodium hydroxide from the black liquor

摘要

A pollution free pulping process wherein a lignocellulosic material is subjected to various pulping and bleaching steps without the use of sulphur and chlorine. The system is a closed one thus minimizing energy and chemical requirements while permitting one to obtain a product having excellent physical properties.