BIOFUEL


INDUSTRY NEWS Lignin Recovery in a kraft pulp mill T


he most quantifiable benefits to a kraft mill for installing a Lignin Recovery system are the ability to remove a bottleneck at a recovery boiler to increase pulp production and to have a sustain- able biofuel to replace fossil fuels in the lime kiln. The enhanced revenue from increasing pulp production and the cost savings from substituting purchased fossil fuels, in addition to the environmental impact of reducing greenhouse gas emissions, can be readily calculated to determine the payback.


Today, with the increased knowledge and emphasis on bi- orefineries and bioproducts, there is potential for a new revenue stream. Lignin is now utilised as a sustainable, renewable raw material for advanced bioproducts


Lignin can be utilised as a renewable fuel or a sustainable raw material for advanced bioproducts.


such as composites or as a sub- stitute for phenolic and aromatic compounds.


The challenge in making the


Lignin Recovery technology cost-competitive has been to reduce the cost associated with removing excess sulphur that is


introduced in the chemical recov- ery cycle with the addition of sul- phuric acid used in the process. This cost is primarily the NaOH


Diagram shows the Lignin Recovery process developed by Andritz.


14 14 Spring 2018


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