Stora Enso uses the Kraft process to convert wood into pulp, which consists of almost pure cellulose fibers. As a first step, Hardwood chips are pretreated with hot water (150 – 200°C) to remove hemicelluloses (i.e. pre-hydrolysis). Together with hemicelluloses, also significant amounts of organics (such as lignin) or minerals (such as calcium) are dissolved in the acidic pre-hydrolysis liquor (PHL).
To reduce the waste streams generated by this Kraft process, the liquors are further processed, and the solid faction of the liquor is concentrated up to at least 30%. One of the issues that comes along with this is that, when cooling down the PHL, the lignin precipitates and fouls most parts of the processing equipment, resulting in systematic shutdowns for maintenance and cleaning.
For this reason, Stora Enso is looking for solutions that prevent the lignin from fouling their equipment when processing the pre-hydrolysis liquors.
For complete details on the eligibility criteria that governs the Preventing Lignin from Fouling Processing Equipment challenge please refer to the website.
Terms and Conditions
For complete details on the terms and conditions that governs the Preventing Lignin from Fouling Processing Equipment challenge please refer to the website.