US 12,077,613 B2
Method of production of lignin and hemicellulose from a plant lignocellulosic material
Bouchra Benjelloun Mlayah, Pompertuzat (FR); and Michel Delmas, Auzeville-Tolosane (FR)
Assigned to Compagnie Industrielle de la Matiere Vegetale—CIMV, Neuilly sur Seine (FR)
Appl. No. 16/970,623
Filed by COMPAGNIE INDUSTRIELLE DE LA MATIERE VEGETALE—CIMV, Neuilly sur Seine (FR)
PCT Filed Feb. 19, 2019, PCT No. PCT/EP2019/054103
§ 371(c)(1), (2) Date Aug. 17, 2020,
PCT Pub. No. WO2019/162277, PCT Pub. Date Aug. 29, 2019.
Claims priority of application No. 18305175 (EP), filed on Feb. 20, 2018.
Prior Publication US 2021/0079123 A1, Mar. 18, 2021
Int. Cl. C08B 37/00 (2006.01); C07G 1/00 (2011.01); C13K 1/02 (2006.01)
CPC C08B 37/0057 (2013.01) [C07G 1/00 (2013.01); C13K 1/02 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method of production of lignin and hemicellulose from a plant lignocellulosic material comprising the steps of:
(a) contacting a plant lignocellulosic material with an extraction solution comprising:
acetic acid in an amount of 52.5% to 57.5% by weight,
formic acid in an amount of 27.5% to 32.5% by weight and
water in an amount of 15% to 17.5% by weight,
during between 3 hours and 3.5 hours at a temperature between 95° C. to 110° C. at atmospheric pressure, thereby obtaining a solid fraction and a liquid fraction,
(b) separating the solid fraction and the liquid fraction,
(c) concentrating the liquid fraction so as to obtain a concentrated liquid fraction comprising dry matter in a proportion of between 60% and 70% by weight,
(d) mixing in a continuous mode equal parts by weight of water with the concentrated liquid fraction at a temperature between 50° C. and 60° C. so as to obtain a suspension comprising solid particles in suspension in a liquid medium,
(e) separating the solid particles and the liquid medium of said suspension,
(f) recovering the solid particles of said suspension thereby obtaining a fraction comprising lignin particles called lignified fraction, and
(g) recovering the liquid medium of said suspension thereby obtaining a fraction comprising hemicellulose called hemicellulosic fraction.