# US 2013/0158253 A1 · Process for recovering sugars from a pretreatment stream of lignocellulosic biomass

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- Number: US 2013/0158253 A1
- Document ID: US20130158253A1
- Status: Published application
- Kind: A1
- Application number: 13/817,869
- Filed: 2011-09-29
- Published: 2013-06-20
- Earliest claimed: 2010-09-29
- Assignees: Beta Renewables S.p.A.
- Inventors: Piero Ottonello; Simone Ferrero; Paolo Torre; Francesco Cherchi; Danilo Defaveri; Luis Oriani
- Web page: https://patentgrep.com/patent/US20130158253A1

## CPC

- C08B 37/0057: {beta-D-Xylans, i.e. xylosaccharide, e.g. arabinoxylan, arabinofuronan, pentosans; (beta-1,3)(beta-1,4)-D-Xylans, e.g. rhodymenans; Hemicellulose; Derivatives thereof}
- C08H 8/00: Macromolecular compounds derived from lignocellulosic materials {(pretreatment thereof B27N)}
- C12P 19/02: Monosaccharides (2-ketogulonic acid C12P7/60)
- C13K 1/02: obtained by saccharification of cellulosic materials (manufacture of fodder A23K10/32)
- C13K 13/002: {Xylose}
- C13K 13/007: {Separation of sugars provided for in subclass C13K (C13K3/00 takes precedence)}
- D21B 1/02: Pretreatment of the raw materials by chemical or physical means (removal of bark B27L)
- D21B 1/12: by wet methods, by the use of steam (beaters D21D1/00)
- D21B 1/36: Explosive disintegration by sudden pressure reduction
- D21C 1/02: with water or steam
- C12P 2201/00: Pretreatment of cellulosic or lignocellulosic material for subsequent enzymatic treatment or hydrolysis
- C08B: POLYSACCHARIDES; DERIVATIVES THEREOF (polysaccharides containing less than six saccharide radicals attached to each other by glycosidic linkages C07H; fermentation or enzyme-using processes C12P19/00; sugar industry C13; production of cellulose D21)
- C08H: DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS (polysaccharides C08B; natural rubber C08C; natural resins or their derivatives C09F; bituminous materials C10)
- C12P: FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE {(brewing of beer C12C; producing vinegar C12J; producing specific peptides or proteins C07K; producing enzymes C12N9/00; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification C12N15/00; measuring or testing processes involving enzymes or microorganisms C12Q; measuring or testing processes involving nucleic acid amplification reactions C12Q1/6844; fermentation processes to form a food composition, A21 or A23; compounds in general, see the relevant compound class, e.g. C01, C07)}
- C13K: SACCHARIDES OBTAINED FROM NATURAL SOURCES OR BY HYDROLYSIS OF NATURALLY OCCURRING DISACCHARIDES, OLIGOSACCHARIDES OR POLYSACCHARIDES (chemically synthesised sugars or sugar derivatives C07H; polysaccharides, e.g. starch, derivatives thereof C08B; malt C12C; fermentation or enzyme-using processes for preparing compounds containing saccharide radicals C12P19/00; production of sucrose C13B)
- D21B: FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21C: PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR

## Abstract

This specification discloses an improved method for conducting the removal of C5 xylan based sugars from biomass. The improved method involves a series of soakings and washings of the biomass as opposed to conducting one soaking and washing step.

## Claims

### Claim at position 1

1-6. (canceled)

### Claim 7

A process for the soaking of lignocellulosic biomass, comprising the steps of
A) introducing a lignocellulosic biomass feedstock into a first soaking zone,
B) soaking the lignocellulosic biomass feedstock in the presence of a liquid or vapor of the liquid for a first time and a first temperature correlating to a first severity of the soaking conditions creating a first liquid comprised of at least one compound selected from the group consisting of acetic acid, glucose, xylose and soluble oligomers thereof,
C) separating at least a portion of the first liquid comprised of the at least one compound selected from the group consisting of acetic acid, glucose, xylose and soluble oligomers thereof from the biomass of the first soaking,
D) introducing the biomass of the first soaking zone into a second soaking zone in the presence of a liquid for a second time and a second temperature correlating to a second severity of the soaking conditions creating a second liquid comprised of at least one compound selected from the group consisting of acetic acid, glucose, xylose and soluble oligomers thereof wherein the second severity is greater than first severity, and
E) separating at least a portion of the second free liquid comprised of the at least one compound selected from the group consisting of acetic acid, glucose, xylose and soluble oligomers thereof from the biomass of the second soaking

### Claim 8 (depends on 7)

The process according to claim 7, comprising the further steps of introducing the biomass from the second soaking zone into a third soaking zone in the presence of a liquid for a third time and at a third temperature range correlating to a third severity of the soaking conditions creating a third liquid comprised of at least one compound selected from the group consisting of acetic acid, glucose, xylose and soluble oligomers thereof wherein the third severity is greater than second severity, and
separating at least a portion of the third liquid comprised of at least one compound selected from the group consisting of acetic acid, glucose, xylose and soluble oligomers thereof from the biomass of the third soaking

### Claim 9 (depends on 7)

The process according to claim 7, wherein the soaking of each soaking zone is conducted in a separate vessel.

### Claim 10 (depends on 8)

The process according to claim 8, wherein the soaking of each soaking zone is conducted in a separate vessel.

### Claim 11 (depends on 7)

The process according to claim 7, wherein the soaking zones are in a single vessel and the first soaking zone is positioned above the second soaking zone.

### Claim 12 (depends on 8)

The process according to claim 8, wherein the soaking zones are in a single vessel and the first soaking zone is positioned above the second soaking zone.

### Claim 13 (depends on 7)

The process according to claim 7, wherein the soaking zones are in a single vessel and first soaking zone and second soaking zone are horizontal to each other.

### Claim 14 (depends on 8)

The process according to claim 8, wherein the soaking zones are in a single vessel and first soaking zone and second soaking zone are horizontal to each other.

### Claim 15 (depends on 7)

The process according to claim 7, wherein the soaking zones are in a single vessel and the first soaking zone is located beneath the second soaking zone.

### Claim 16 (depends on 8)

The process according to claim 8, wherein the soaking zones are in a single vessel and the first soaking zone is located beneath the second soaking zone.