Method for recovering saccharide from saccharified slurry, and washing device for washing residue

Patent metadata

Field	Value
Publication number	US-9850550-B2
Application number	US-201314758410-A
Country	US
Kind code	B2
Filing date	Dec 3, 2013
Priority date	Dec 27, 2012
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A saccharide recovering method for recovering saccharides from a saccharified slurry obtained after subjecting a slurry of cellulosic biomass to a hot water treatment and to provide a washing device for washing a saccharified slurry residue suited for conducting such a saccharide recovery method is provided. Saccharified slurry of cellulosic biomass is fed on a conveyor having a net conveyor belt, the saccharified slurry is dehydrated, washing water is sprayed to dissolve saccharides remaining in the residue into the washing liquid. The residue is washed by a plurality of washing water spraying units disposed in series in such a manner that the moving direction of the residue and the moving direction of the washing water are opposite to each other. The washing water having washed the residue is used as washing water for washing water spraying unit in the direction opposite to the moving direction of the conveyor.

First claim

The invention claimed is:

1. A method for recovering saccharide from a saccharified slurry, comprising:
a washing step of feeding a saccharified slurry containing C5 saccharides or C6 saccharides obtained by subjecting a slurry of cellulosic biomass to a hot water treatment in a supercritical state or subcritical state, on a conveyor having a net conveyor belt, dehydrating the saccharified slurry and spraying washing water to a dehydrated residue on the conveyor to dissolve C5 saccharides or C6 saccharides remaining in the residue in a washing liquid, wherein
the washing step washes a residue by spraying washing water to the residue from a plurality of washing water spraying units disposed in series in such a manner that the moving direction of the residue and the moving direction of the washing water are opposite to each other, and
the washing water having washed the residue is used as washing water of a washing water spraying unit neighboring in the direction opposite to the moving direction of the conveyor.

2. The method for recovering saccharides from a saccharified slurry according to claim 1 , further comprising an adding step of adding a flocculant to the saccharified slurry before the washing step.

3. The method for recovering saccharides from a saccharified slurry according to claim 2 , wherein the net conveyor belt has a mesh ranging from 0.5 mm or more and 2.0 mm or less.

4. The method for recovering saccharides from a saccharified slurry according to claim 2 , wherein the number of the washing water spraying units is five or more and twenty or less.

5. The method for recovering saccharides from a saccharified slurry according to claim 1 , wherein the net conveyor belt has a mesh ranging from 0.5 mm or more and 2.0 mm or less.

6. The method for recovering saccharides from a saccharified slurry according to claim 5 , wherein the number of the washing water spraying units is five or more and twenty or less.

7. The method for recovering saccharides from a saccharified slurry according to claim 1 , wherein the number of the washing water spraying units is five or more and twenty or less.

8. The method for recovering saccharides from a saccharified slurry according to claim 2 , wherein in the adding step, one or combination of two or more of a cationic flocculant, an anionic flocculant, a nonionic flocculant and an amphoteric flocculant is added at 0.1% by mass or more and 2% by mass or less with respect to a solid content of the saccharified slurry.

9. A washing device that washes a solid residue in a saccharified slurry containing C5 saccharides or C6 saccharides obtained by subjecting a slurry of cellulosic biomass to a hot water treatment in a supercritical state or subcritical state, the washing device comprising:
a conveyor having a net conveyor belt;
a plurality of spraying units disposed in series on the net conveyor belt; and
a plurality of water storage tanks disposed below the net conveyor so that they are situated below the respective spraying units;
the washing device feeding a saccharified slurry on the net conveyor belt, dehydrating the saccharified slurry, and then spraying washing water to the residue on the net conveyor belt from the spraying unit, thereby washing the residue,
wherein one of the water storage tanks is connected with one spraying unit neighboring in the direction opposite to a moving direction of the conveyor by piping, and
the water storage tank stores water sprayed from the spraying unit disposed directly above, and the stored water is repeatedly used sequentially in the spraying unit neighboring in the direction opposite to the moving direction of the conveyor via a pump and piping to continuously wash the residue.

10. The washing device according to claim 9 , wherein the number of the spraying units is five or more and twenty or less.

11. A washing device that washes a solid residue in a saccharified slurry containing C5 saccharides or C6 saccharides obtained by subjecting a slurry of cellulosic biomass to a hot water treatment in a supercritical state or subcritical state, the washing device comprising:
a conveyor having a net conveyor belt;
a plurality of water storage tanks; and
a washing water spraying unit,
the washing device feeding a saccharified slurry on the net conveyor belt, dehydrating the saccharified slurry, and then spraying washing water to the residue on the net conveyor belt, thereby washing the residue,
wherein the plurality of water storage tanks are sequentially stacked at different heights in such a manner that part of the water storage tank neighboring in the direction opposite to a moving direction of the conveyor is lower,
the net conveyor belt turns around so as to pass through the top face of every water storage tank from the water storage tank situated at the lowest position to the water storage tank situated at the highest position, and
the plurality of water storage tanks stores washing water sprayed on the net conveyor belt from the washing water spraying unit disposed above the water storage tank situated at the highest position, and repeatedly sprays the stored washing water sequentially on the net conveyor belt above the water storage tank neighboring in the direction opposite to the moving direction of the conveyor, thereby continuously washing the residue.

12. The washing device according to claim 11 , wherein the number of the plurality of water storage tanks is five or more and twenty or less.

Assignees

• Kawasaki Heavy Ind Ltd

Inventors

• Tsujita Shoji
• Izumi Noriaki
• Tajiri Hironori
• Kusuda Hiromasa
• Tsuzawa Masaki

Classifications

• C13K1/04 Primary

  Purifying · CPC title

• C13B20/16 Primary

  by physical means, e.g. osmosis or filtration · CPC title