Studies On Cellulose Saccharification Based On Dilute Acid Hydrolysis

The biomass resource is potential at present,as will play an important role in dealing with the severe fuel crisis.The reuse of agricultural offal is payed more attention.The corn straw and residue from the sugar plant were used as material to hydrolyse under the dilute acid,and the reaction condition was optimized by the reducing sugar yield.The main results are as follows.The pledget and qualitative filter were chosen to represent the main component of lignocellulose,and the vessel that can endure high temperature and pressure was used as reactor.The reaction conditions grads were chosen to ascertain the basic condition of hydrolysis of cellulose under dilute acids.The reducing sugar yield is used to optimize reation conditions.And the best reation conditions are temperature 180℃and sulfur acid concentration 4% in 80minutes,which provided reference for hydrolysis of straw and residue from the sugar plant under dilute acids.To carry out the reuse of residue from the sugar plant such as corn straw,saccharum officinarum residue,beet residue and sweet sorghum residue,the reactor was designed.Orthogonal experiment was carried out to research the influence of the sulfur acid concentration,granularity,the ratio of liquid and solid and metal salt catalyst.The results of orthogonal experiment indicated that the highest reducing sugar yields of straw,officinarum residue,beet residue and sweet sorghum residue were 60.42%,69.89%,64.88% and 70.28%.The best reaction conditions of the materials were also reckoned.The experiment did an important research on metal salt catalyst,which concluded that the catalyst such as Fe2+ and Cu2+ could raise the reducing sugar yield by the contrast to CK.There was a good effect of Fe2+,which is better than Cu2+.On the basis of contrast to quantitative and qualitative analyse of sugar offspring,the glucose and xylose were quantitated.The results indicated that the xylose was less than glucose.And the results to analyse the byproducts indicated that the catalyst played an important role on reducing formic acid,acetic acid,levulinic acid,acetone and furfural.The content of byproducts with catalyst in the liquid was more than that without catalyst in the liquid.A systemic research about saccharification of lignocellulose under dilute acids was carried out,which will benefit the utilization of straw and residue from the sugar plant.