The Lignoboost Process

A process for lignin removal from alkaline pulping liquors (black liquors) has been developed within the FRAM2 R&D Program (Future Resource Adapted Pulp Mill, part 2). The lignin product (Fig. 1) from a demonstration plant, owned and operated by Innventia (formerly STFI-Packforsk), was characterized and used in different combustion trials with good results – co-firing of lignin and bark in a fluidized bed boiler, co-firing with coal in a PFBC (Pressurized Fluidized Bed Combustion) boiler and firing of lignin in a fullscale lime kiln. The process development and operation of the demonstration plant has displayed good results. Runnability in the demonstration plant and the lignin quality have been both very good. The work done on the investment and operational costs showed great potential for improving the concept of economy, which is very promising.