Study On Purification Of Monosaccharide Degradation Of Maize Straw Liquid

Corn straw composition is mainly composed of cellulose,hemicellulose and lignin.We can obtain xylose,glucose,galactose,arabinose and mannose from cellulose,semi cellulose by chemical method and biological method treatment use for ethanol,xylitol,lactic acid,furfural and other other biological products.Because the surface of cellulose is covered with the semi cellulose and lignin,caused the structure of the corn stalk is difficult to be degraded,and the recovery rate is low.Corn stalk as raw material,the technology which cooperates with sulfuric acid to degradate the corn straw is optimized by using the single factor experiment and response surface methodology.Analysis of the microwave cooperated with ultrasonic method and high-temperature,both of which assist the sulfuric acid to degradate the corn straw,has been performed.The efficiency of reducing sugar was increased,The high efficient separation of sugar and sulfuric acid can be realized,which can reduce environmental pollution and reduce production cost,as well as provide reliable data for the separation of simulated mobile chromatography.This study is divided into five parts:1.Processing on the Sulfuric Acid Hydrolysis of Corn Straw of Microwave Cooperated with Ultrasonic.The optimum technological condition is: the temperature 82℃,the reaction time153 min,3.1% sulfuric acid concentration,solid-liquid ratio1:45,microwave power 634 W.Under this condition listed above,the maximum value of the reducing sugar yield is 41.24%.2.Processing on the Sulfuric Acid Hydrolysis of Corn Straw of High-temperature.The optimum technological condition is: the temperature 115℃,the reaction time 2h,2% sulfuric acid concentration,solid-liquid ratio 1:24.Under this condition listed above,the maximum value of the reducing sugar yield is 37.70%.3.Structure detection and detection of acid hydrolysate.After acid treatment,the crystallinity of corn straw was no change than befor,and the crystallinity of corn stalk was 31.09%,37.17%and 35.01% respectively,which were not treated,microwave and ultrasonic acid treatment and high temperature acid treatment.In the microwave and ultrasonic acid solution,analysis of the Arab sugar content is 1.75%,galactose content is 0.44%,glucose content is 15.65%,xylose content is 7.98%,fructose content is 15.34%.In High temperature acid solution,analysis of the Arab sugar content is 2.56%,galactose content is 0.79%,glucose content is 20.23%,xylose content is 14.13%.4.Optimization of process parameters for the separation of reducing sugars from sulfuric acid.Based on the comparison of the degree of separation between sulfuric acid and reducing sugar in three kinds of resins,IR118 resin was determined as the optimal stationary phase for separating reducing sugar and sulfuric acid.Through three factors of flow rate,temperature and sample volume,the optimum technological parameters were determined as the flow rate of1.0mL/min,the temperature of 55℃,and the sample volume of 3mL.5.Determination of adsorption isotherms.The adsorption behavior of Freundlich and Langmuir2 on the adsorption behavior of reducing sugar and sulfuric acid on the column was compared,and the fitting degree of Freundlich model was high.