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

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.

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.