Effect Of Hemicellulose On Paper Properties And Study Of Biomass Utilization

The high-speed and expansible development model of pulp and papermakingindustry in our country is suffered the restriction both from resources and environment.It is imperative to implement the strategy of sustainable development and build aresource-saving, environment-friendly papermaking industry. According to the principleof reduction, recycling and resources, the circular economy is developed vigorously.Hemicellulose is the second component of the botany which is second only to cellulose.The effect of hemicellulose on the properties of high yield pulp and resource utilizationof corn stalks are very important.The timber resources in our country are in shortage seriously, while the productionof high yield pulp is the effective way to improve the usage of hardwood. During theproduction of high yield pulp,nearly all of the lignin is saved,so it is easy to yellow pulpand paper again. It will inhibit becoming yellow after biological enzyme treatment andit also can save beating energy and reduce production cost.The main purpose of thispaper is to research the effective of the hemicellulose on the qualities of paper firstly.Then study the modification and application of hemicellulose which exist in corn stalkspreliminarily.This paper studys the optimization of processing conditions of xylanase AU-PE89.In this paper,five factors and four levels orthogonal experiment L16(45) were used. In theexperiment,the enzyme dosages are20IU/g,30IU/g,40IU/g and50IU/g,absolute drypulp as a reference;temperatures are45℃,50℃,55℃and60℃, pHare5,6,7and8;enzyme treatment times are60min,70min,80min and90min;pulp concentrations are9%,10%,11%and12%.These are as variables to study the effect on the fiber morphology,the pulp yield before and after enzyme treatment on fiber morphology, the pulp yield,strength and optical properties.Analysis of the xylanase AU-PE89optimized processing conditions are as follows:pulp concentration is11%, enzyme dosage is50IU/g(absolute dry pulp), temperature is45℃, pH=7,or enzyme dosage is40IU/g(absolute dry pulp), temperature is50℃andpH=7are the best processing conditions.Under this condition, the maximum pulp yieldis87.35%, breaking length is4.19km, tearing index is5.02mN m2g-1, burst index is2.94kPa m2g-1, brightness is71.02%ISO.This paper has also studied the optimization of processing conditions of xylanase AU-PE90. Five factors and four levels orthogonal experiment L16(45) were used. Thecovariates are as follows: the enzyme dosages are15IU/g,25IU/g,35IU/g and45IU/g,absolute dry pulp as a reference; temperatures are20℃,30℃,40℃and50℃;pHare5,6,7and8; enzyme treatment times are60min,70min,80min and90min; pulpconcentrations are9%,10%,11%,12%. This experiment has studied the effect on thefiber morphology, the pulp yield before and after enzyme treatment on fiber morphology,the pulp yield, strength and optical properties.Analysis of the xylanase AU-PE90and optimized processing conditions are asfollows: pulp concentration is11%, enzyme dosage is35IU/g (absolute dry pulp),temperature is40℃, pH=7and the treating time is80min.Under this condition, themaximum pulp yield is85.31%, maximum breaking length is4.27km,maximum tearingindex is4.85mN m2g-1, burst index is2.74kPa m2g-1, maximum brightness is71.62%ISO.This paper has studied the cationic modification of hemicellulose in corn stlks, andinitially identified the best modification conditions of hemicellulose in corn straws.Thispaper has also studied the effect of modified hemicellulose on the properties of pulp andpaper. The experimental results show that the effect of modified hemicellulose onimproving pulp paper performance is obvious by adding the modified hemicelluloseinto paper. The maximum breaking length is4.07km, burst index is2.78kPa m2g-1andthe tearing index is4.57mN m2g-1.