TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Compositions: Mass ratio of oven dry bagasse and hydrolysis liquid is 1:8, and concentration of added sulfuric acid is 1.2 mass%. Amount of added seed crystal is 0.5 wt.% with respect to xylose and xylitol solutions. Xylose mother liquor contains greater than or equal to 10% glucose, greater than or equal to 60% xylose, and greater than or equal to 13% arabinose. Preferred Processes: Xylose is produced by acid hydrolysis of bagasse pectosan to obtain monosaccharide, centrifuging to separate slag, collecting centrifugate, adding purified water, leaching wet slag residue in centrifuge, recycling residual sugar, combining water washing, hydrolyzing intermittently at 0.12 MPa and 123 degrees C using 1.2% sulfuric acid for 2.5 hours in which ratio of water for washing and oven dry bagasse is 2.5:1, decolorizing with 1% zinc powder and activated carbon at 75 degrees C with 150 r/minute stirring for 30 minutes to obtain 80% transmittance, passing through 1st cation exchange resin column, 1st anion exchange resin column, and 2nd cation exchange resin column at sugar flow rate of 1 BV/h in which discharge sugar solution has refractive index of 1.8-3%, greater than or equal to 85% light transmission, and pH of 2.5-3, rotary evaporating at - 0.085 MPa and 80 degrees C with 20 r/minute evaporator speed to obtain yellow translucent liquid containing 25% refractive sugar, decolorizing with 1% zinc powder and activated carbon at 75 degrees C with 150 r/minute stirring for 30 minutes to obtain greater than or equal to 85% light transmittance, passing through 2nd anion exchange resin column, 3rd cation exchange resin column, and 3rd anion exchange resin column at sugar flow rate of 1 BV/h in which discharge sugar solution has colorless to pale yellow color, refractive index of 12-16%, greater than or equal to 95% light transmission, and pH of 5-7, evaporating at - 0.085 MPa and 80 degrees C with stirring of 20 r/minute concentrate sugar solution from 12-16% to 45-60%, evaporating at - 0.085 MPa and 80 degrees C with stirring of 20 r/minute concentrate sugar solution from 45-60% to 81-83%, subjecting to vertical vacuum crystallizer at 25 r/minute rotation and 2-3 degrees C/hour cooling rate, adding seed crystal for 6-8 hours, cooling at 1 degrees C/hour in which total of cooling time is 40 hours, adjusting rotational speed to moderate, cooling to 35 degrees C, stopping water circulation system and stirring, discharging to mold, allowing crystallization to end, determining discharge indexes to obtain white or light yellow viscous crystal suspension paste, placing in high-speed rotating drum or screen basket to separate xylose crystals from mother liquor, filtering through cloth, centrifuging filtrate, adding absolute ethanol every 5 minutes, centrifuging to obtain white xylose crystals with 1-2% moisture, and electric blast drying at less than or equal to 50 degrees C to less than or equal to 0.5% moisture. Xylose is recovered from L-arabinose mixture by evaporating microfiltered xylose solution to 55% refractive index, continuously evaporating to 83% refractive index, subjecting to vertical crystallizer with cooling water circulating system, precipitating xylose, centrifuging, and drying. Preferred Parameters: Obtained xylose has white color, uniform crystals, good liquidity, and purity of greater than or equal to 99.5%.