Lo-Solids^TM Cooking Continues to Evolve

The EAPC^TM and M 2^TM Process

Abstract

Lo-Solids^TM cooking involves the use of multiple extractions, multiple white liquor additions, and multiple filtrate additions. It thus allows for independent control of both the hydraulic and chemical reaction environments within the various zones of a continuous digester. In practice, this high degree of process flexibility has been used to optimize more than 35 continuous cooking systems. Documented improvements in performance include : increased yield, increased strength and viscosity, increased extraction and washing capacity, increased production capacity, more uniform cooking, and decreased maintenance requirements.
Recently, the inherent flexibility of Lo-Solids^TMcooking has also been used in the development of two new cooking systems, the EAPC^TM and M 2^TM cooking processes. The Lo-Solids-EAPC^TM process is specifically designed to maximize pulp strength and bleachability. The Lo-Solids-M 2^TM process is designed to maximize yield and, in particular, to maximize the effectiveness of yield enchancing additives such as polysulfide and/or anthraquinone. While the two processes have markedly different objectives and configurations, they are accomplished with identical equipment. The following paper will provide a description of these two new processes.