CPC C07G 1/00 (2013.01) | 5 Claims |
1. A process for preparing a processed lignin containing less than 0.1% by weight of total CI, wherein the process comprises the steps of subjecting particulate matter comprising lignin and cellulose and optionally hemicellulose to:
a. acidic hydrolysis using hydrochloric acid of at least 35% by weight so that at least 60% by weight of the cellulose is hydrolysed, yielding hydrolysate and a particulate residue,
b. wherein said residue is dried to a moisture content of less than 3% by submitting the residue to a temperature of less than 240° C. under an inert atmosphere, and said drying step is carried out such that it recovers at least part of the hydrogen chloride used in step a,
c. subjecting the obtained particulate residue to a high temperature treatment of between 300 and 500° C. under inert gaseous atmosphere to a level of total CI in the particulate residue level of below 0.1% by weight.
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