Yu Xin Liu

Bagasse Wet-Stored with the Hypochlorite Bleaching Waste Water

In this paper, the bagasse was wet stored by hypochlorite bleaching waste water with or without chlorine. The dissolution ability of lignin, total sugar and reducing sugar was investigated. Then the effluent properties with the wet storage time prolonging were tested. The results showed that some small molecular weight substances were dissolved from baggase, such as sugar and lignin. And the dissolution ability of hypochlorite bleaching waste water with chlorine was better than that of hypochlorite bleaching waste water without chlorine. And the change trend of effluent properties for the two wet storage system were similar. With the wet storage time extending, the dissolved substances were degraded, COD and chroma of effluent were decreased, and the properties of effluent were improved.

Study on Furfural Production from Hemicelluloses

In this paper, furfural was produced from hemicelluloses of bagass by hydrolization reaction with sulfuric acid and acetic acid respectively. The effect of several variables such as temperature , liquid-to-solid ratio ,time and catalyst charge（KCL） on furfural yield was studied. The results showed that the better yield of furfural was obtained in acetic acid hydrolysis system. However, compared to yield of acetic acid hydrolysis system, it need more time and higher temperature at the same liquid-to-solid ratio. At last, when sulfuric acid as catalyst, liquid-to-solid ratio was 1:6 and time was 5h at 150°C, furfural yield can reach 75 %.

Optimization of Superior Shoes Board Immersion Condition

This paper studied on the influence of impregnation process on original board by using the Styrofan SD 332S which could improve the international bending strength, then own higher wear-resistant, fold-resistant and tear-resistant. Trough single factor experiments, the optimum impregnation processing conditions were: wet cardboard dryness of 45%, immersion at 35 °C for 4 minutes, preliminary drying at 70 °C under the premise of 300 ml, 20% latex concentration, subsequent drying at 100°C for 2h. Under the conditions of impregnation process, the property index of shoes board were: tensile strength 0.34 kN/cm2 through immersion 4 h, elongation of 1.56% through immersion 1 h, shrinkage of 0.84% through high temperature drying 1 h, peeling strength between layers 0.29N, fold endurance 5721 times.

Hemicelluloses Separation from Black Liquor

The black liquor from NaOH-AQ pulping of bagasse was treated by conventional alcohol precipitation method to separate hemicelluloses. In the system of alcohol/methanol, some parameters which may affect the hemicelluloses precipitation were discussed, such as mixed alcohols charge, temperature, pH and time. The obtained hemicelluloses were analyzed by FT-IR. The results showed that compared with conventional separation system of hemicelluloses by alcohol, when the Valcohol : Vmethanol was 5:5 and pH was 4.5 at 45°C, the consumption of alcohols was decreased by 17% to 30%. Moreover, the addition of flocculants of PAC/A PAM in the process of hemicelluloses separation, the consumption of organic solvents would be further decreased.

Study on the Strength Properties of Superior Shoes Board and Furnish

The shoe board emphasizes the strength and the bear to fold especially, so it chooses the long fiber raw material. The experiment confirms optimal beating condition and formula through the analysis of beating of the jute pulp and the softwood (Larch) pulp and a series of condition experiment. The board raw material category is: jute: softwood = 7:3; Jute: 40 oSR, softwood: 30 oSR. The properties of original board are: breaking length: 6115 meters, index: 15.79mN·m2/g, fold endurance: 2125 times.

Hemicelluloses Separation from APMP Liquid

On the premise of biomass comprehensive using concept, the screw section liquid of aspen APMP was treated by alcohol precipitation method to separate and analyze the hemicelluloses. In the traditional alcohol separation system, not only the effect of the temperature, alcohol dosage, pH value and precipitation time on the hemicelluloses separation was researched, but also the methanol system and alcohol-CPAM system were discussed. The results showed that the hemicelluloses yield was relatively ideal when the AMPM liquid was treated by 2.5 times volume of alcohol at pH of 4.0 at 45°C for 30 min. In addition, compared with alcohol system, the methanol dosage was decreased by about 12% in methanol system and the alcohol dosage was also decreased In the alcohol-CPAM system, when the hemicelluloses yield was similar.

Effect of Wet Storage on Return Yellow Performance of High Yield Chemical Pulp

In this paper, the effect of residual chlorine of hypochlorite (H) on high yield pulping with H2O2/CoSO4 of wet stored bagasse was studied. Compared with control sample, the pulp of the bagasse wetstored with H or Ho (without residual chlorine) bleaching waste water had better pulping yield and the pulp optical property was lost seriously, but the pulp return yellow performance was control. If it had no requirement on the brightness or the pulp must be kept at the condition easy to return yellow, the wet storage with H or Ho bleaching waste water was a good method to improve the pulping yield, control the change of brightness and save clean water.

Effect of Wet Storage on High Yield Pulping with H2O2-CoSO4

In this paper, the effect of residual chlorine of hypochlorite (H) on high yield pulping with H2O2/CoSO4 of wet stored bagasse was studied. Compared with control sample, the pulp of the bagasse wetstored with H or Ho (without residual chlorine) bleaching waste water had better pulping yield and strength, but the pulp optical property was lost seriously. If it had no requirement on the brightness, the wet storage with H or Ho bleaching waste water was a good method to improve the pulp strength and save clean water. In addition, the wet storage of bagasse using the H bleaching waste water without residual chlorine, the pulping properties was more stable than that of the wet storage using H bleaching waste water with residual chlorine. To the wetstorage with Ho bleaching waste water, the ideal treatment time was 16day.

Effect of Cellulase Pretreatment on Alkali-Oxygen Pulping of Bagasse

In this paper, the process of cellulase pretreatment before alkali-oxygen pulping of bagasse was studied. The effect of cellulase pretreatment on subsequent pulping was also researched. The results showed that some small-sized components and sugars dissolved into the effluent in the process of cellulase pretreatment. UV spectroscopy showed that there was no significant lignin content in the pretreatment effluent.It was also found that pulping properties were promoted when the cellulase dosage was 2 ECU/g pulp, in that under the same cooking conditions, pulp kappa number was decreased by 1.3 and pulp brightness was increased by 2.5 %ISO, while the viscosity of pulp also increased slightly. Moreover, the tensile index, tear index and folding endurance were increased by 8%, 7% and 30%, respectively, but burst index showed no significant change. The above results illustrated that cellulase pretreatment was only beneficial to the dissolution of sugars and fine components from bagasse and it was an effective method of promoting alkali-oxygen pulping of bagasse.

Hemicelluloses Extraction of Bagasse with NaOH/Borax

In this paper, the hemicelluloses extraction of bagasse with NaOH/borax was studied, and some parameters which may affect the hemicelluloses yield and properties were discussed, such as alkali charge, borax charge, liquid-to-solid ratio, temperature and time of extraction. The compositions and characteristics of hemicelluloses were analyzed by FT-IR, GC, GPC. The results showed that compared with the conventional alkali extraction, the hemicelluloses dissolution rate was increased and degradation degree of the hemicelluloses was decreased with NaOH/borax. When the alkali charge was 65%(based on NaOH)and borax charge was 7% at a liquid-to-solid ratio of 15:1 at 90 °C for 180 min, the dissolution rate of hemicelluloses up to 84.5% (to the hemicelluloses content in material).