US 12,168,672 B2
Processed lignin and process to prepare such
Anna Louise Jongerius, Amsterdam (NL); Scott Henry Russell, Amsterdam (NL); Kay Jochem Damen, Amsterdam (NL); and Benjamin McKay, Amsterdam (NL)
Assigned to Avantium Knowledge Centre B.V., Amsterdam (NL)
Appl. No. 17/616,105
Filed by Avantium Knowledge Centre B.V., Amsterdam (NL)
PCT Filed Jun. 8, 2020, PCT No. PCT/EP2020/065787
§ 371(c)(1), (2) Date Dec. 2, 2021,
PCT Pub. No. WO2020/259991, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 19182146 (EP), filed on Jun. 25, 2019.
Prior Publication US 2022/0298194 A1, Sep. 22, 2022
Int. Cl. C07G 1/00 (2011.01)
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.