# US 7,465,844 B2 · Method of upgrading biomass, upgraded biomass, biomass water slurry and method of producing same, upgraded biomass gas, and method of gasifying biomass

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- Number: US 7,465,844 B2
- Document ID: US7465844B2
- Status: Granted
- Kind: B2
- Application number: 10/523,749
- Filed: 2003-04-25
- Published: 2006-06-01
- Granted: 2008-12-16
- Earliest claimed: 2002-08-12
- Assignees: Jgc Corporation; The Tokyo Electric Power Company, Incorporated
- Inventors: Chiaki Suyama; Shinichi Tokuda; Masao Tsurui; Yoshinori Suto; Koji Tamura; Tsutomu Katagiri; Teruo Nagai; Jin Ogawa; Takeshi Yamaguchi
- Web page: https://patentgrep.com/patent/US7465844B2

## CPC

- C10L 1/326: {Coal-water suspensions}
- C10G 31/08: by treating with water
- C10J 3/00: Production of combustible gases containing carbon monoxide from solid carbonaceous fuels (destructive distillation processes C10B)
- C10L 5/44: on vegetable substances
- C10L 9/086: {Hydrothermal carbonization}
- C10J 2300/0916: Biomass
- C10J 2300/092: Wood, cellulose
- C10J 2300/0973: Water
- C10J 2300/1846: Partial oxidation, i.e. injection of air or oxygen only
- C10L 2250/06: Particle, bubble or droplet size
- C10L 2290/04: Gasification
- C10L 2290/24: Mixing, stirring of fuel components
- C10L 2290/28: Cutting, disintegrating, shredding or grinding
- Y02E 50/10: Biofuels, e.g. bio-diesel
- Y02E 50/30: Fuel from waste, e.g. synthetic alcohol or diesel
- C10L: FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G OR C10K; LIQUIFIED PETROLEUM GAS; USE OF ADDITIVES TO FUELS OR FIRES; FIRE-LIGHTERS
- C10G: CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION (cracking to hydrogen or synthesis gas C01B; cracking or pyrolysis of hydrocarbon gases to individual hydrocarbons or mixtures thereof of definite or specified constitution C07C; cracking to cokes C10B); RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10J: PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES (synthesis gas from liquid or gaseous hydrocarbons C01B; underground gasification of minerals E21B43/295); CARBURETTING AIR OR OTHER GASES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

This method of upgrading a biomass comprises: an upgrading step for performing upgrading treatment of a cellulose based biomass with an oxygen/carbon atomic ratio of at least 0.5, in presence of water and under a pressure of at least saturated water vapor pressure, and reducing said oxygen/carbon atomic ratio of said biomass to no more than 0.38, and a separation step for separating an upgraded reactant obtained from said upgrading step into a solid component and a liquid component.

## Claims

### Claim 1

A method of upgrading a biomass, comprising:
an upgrading step for performing upgrading treatment of a cellulose based biomass with an oxygen/carbon atomic ratio of at least 0.5, in presence of water, under a pressure of at least saturated water vapor pressure, and at a temperature of 250 to 350° C. for a period of 5 to 120 minutes, and reducing said oxygen/carbon atomic ratio of said biomass from 0.216 to 0.38, and
a separation step for separating an upgraded reactant obtained from said upgrading step into a solid component and a liquid component, and recovering said solid component which is an upgraded biomass with said oxygen/carbon atomic ratio of 0.216 to 0.38 whose recovered weight is at least 40% of the weight of said cellulose based biomass.

### Claim 2 (depends on 1)

A method of upgrading a biomass according to claim 1, wherein said cellulose based biomass is a plant based biomass.

### Claim 3 (depends on 1)

A method of upgrading a biomass according to claim 1, wherein said oxygen/carbon atomic ratio of said biomass after said upgrading treatment is no more than 0.3.

### Claim 4 (depends on 1)

A method of upgrading a biomass according to claim 1, wherein said cellulose based biomass has already undergone shredding, and is upgraded in a water slurry form.

### Claim 5 (depends on 1)

An upgraded biomass, upgraded using a method of upgrading a biomass according to claim 1.

### Claim 6 (depends on 5)

An upgraded biomass according to claim 5, wherein a heating value on combustion is at least 27 MJ/kg.

### Claim 7 (depends on 5)

An upgraded biomass according to claim 5, wherein a volatile component is at least 50%.

### Claim 8

A method of producing an upgraded biomass gas, comprising:
performing upgraded treatment of cellulose based biomass with an oxygen/carbon atomic ratio of at least 0.5, in presence of water, under a pressure of at least that of saturated water vapor pressure, and at a temperature of 250 to 350° C. for a period of 5 to 120 minutes, and reducing said oxygen/carbon atomic ratio of said biomass from 0.216 to 0.38,
separating an upgraded reactant obtained by said upgraded treatment into a solid component and a liquid component, and recovering said solid component which is an upgraded biomass with said oxygen/carbon atomic ratio of 0.216 to 0.38 whose recovered weight is at least 40% of the weight of said cellulose based biomass, and
subjecting said recovering solid component to gasification treatment at a gasification temperature within a range from 800 to 1300° C. and a gasification pressure of 0.1 to 10 MPa, in presence of a gasifying agent comprising from 25 to 40% of a quantity of oxygen required for complete combustion, and a required quantity of steam.