Improvement of Wheat-Straw Pulp Properties with an Alkali-Tolerant Xylanase fromPseudomonassp. G6-2

1996 ◽  
pp. 308-316 ◽  
Author(s):  
Jiachuan Chen ◽  
Jianyun Yang ◽  
Yinbo Qu ◽  
Peiji Gao ◽  
Baomin Wang ◽  
...  
Keyword(s):  
Wheat Straw ◽  
Wheat Straw Pulp ◽  
Pulp Properties

Improvement of bleached wheat straw pulp properties by using aspen high-yield pulp

2012 ◽  
Vol 120 ◽  
pp. 40-44 ◽  
Author(s):  
Hongjie Zhang ◽  
Jianguo Li ◽  
Huiren Hu ◽  
Zhibin He ◽  
Yonghao Ni
Keyword(s):  
Wheat Straw ◽  
High Yield ◽  
Wheat Straw Pulp ◽  
Pulp Properties

Study on Xylanase-Aided Bleaching of Wheat Straw KP

2013 ◽  
Vol 726-731 ◽  
pp. 548-551
Author(s):  
Li Jun Zhao ◽  
Mei Hong Niu ◽  
Jian Zhang ◽  
Yan Ning Sun ◽  
Na Li
Keyword(s):  
Hydrogen Peroxide ◽  
Wheat Straw ◽  
Oxygen Pressure ◽  
Treatment Time ◽  
Optimal Concentration ◽  
Experimental Results ◽  
Peroxide Bleaching ◽  
Wheat Straw Pulp ◽  
Pulp Properties ◽  
Oxygen Bleaching

Before oxygen bleaching and hydrogen peroxide bleaching, wheat straw pulp was bleached using xylanase. The effect of enzymatic stage on pulp properties and bleachability has been studied and compared with reference (control) pulps, processed without enzyme addition. Experimental results showed that, the optimal concentration of wheat straw pulp was 10%, the optimal treatment time and dose of enzyme was 60 min and 1.25AXU/g respectively. Oxygen pressure decreased from 0.6MPa to 0.5MPa when conditions of hydrogen peroxide bleachingremained unchanged and wheat straw pulp achieved the same whiteness. Hydrogen peroxide consumption decreased from 2% to 1.8% when oxygen bleaching has the same conditions and achieved the same white degree.

Effect of introducing ozone in elemental chlorine free bleaching of pulp on generation of chlorophenolic compounds

2020 ◽  
Vol 35 (4) ◽  
pp. 559-568
Author(s):  
Sandeep Kumar Tripathi ◽  
Nishi Kant Bhardwaj ◽  
Himadri Roy Ghatak
Keyword(s):  
Optical Properties ◽  
Wheat Straw ◽  
Oxygen Demand ◽  
Elemental Chlorine ◽  
Wheat Straw Pulp ◽  
Pulp Properties ◽  
Organic Halogens ◽  
Ecf Bleaching ◽  
Adsorbable Organic Halogens

AbstractEffect of using ozone before elemental chlorine free (ECF) bleaching of oxygen delignified wheat straw pulp produced following soda-anthraquinone pulping on bleaching effluent and pulp properties was studied. The effluent generated during bleaching of pulp contains high amount of adsorbable organic halogens (AOX), chemical oxygen demand (COD), biochemical oxygen demand (BOD) and highly toxic chlorophenolic compounds. This study is aimed to utilise green chemistry approach during bleaching of one of the abundantly used agro residue wheat straw for improving the quality of bleaching effluent and pulp properties. Introducing ozone stage before ECF bleaching resulted in significant reduction of chloriphenolic compounds like chlorocatechols by 48.9 %, chloroguaiacols by 33.3 %, chlorovanillins by 28.4 % and chlorophenols by 26.7 % in the effluent compared to those of control. Incorporation of ozone before ECF bleaching BOD, COD, AOX and colour were reduced by 40.0 %, 41.1 %, 46.7 % and 57.8 %, respectively, as compared to control. Optical properties like brightness and whiteness of the pulp bleached using ozone were also improved by 2.5 units and 4.0 units, respectively as compared to that with control.

Using of Magnesium Hydroxide and Sodium Hydroxide in DP Beaching of NaOH-AQ Wheat Straw Pulp

2013 ◽  
Vol 690-693 ◽  
pp. 1455-1460
Author(s):  
Wen Bo Wang ◽  
Fan Gong Kong ◽  
Shou Juan Wang ◽  
Ya Jie Zhong ◽  
Gui Hua Yang
Keyword(s):  
Tensile Strength ◽  
Sodium Hydroxide ◽  
Wheat Straw ◽  
Magnesium Hydroxide ◽  
Chlorine Dioxide ◽  
Control Agent ◽  
Bleaching Process ◽  
Peroxide Bleaching ◽  
Wheat Straw Pulp ◽  
Pulp Properties

Sodium hydroxide (NaOH) substituted by magnesium hydroxide (Mg(OH)2) as control agent and alkali source were investigated in chlorine dioxide bleaching and hydrogen peroxide bleaching of NaOH-AQ wheat straw pulp. The effects of alkali sources on pulp properties, including brightness and tensile strength, were investigated. The four experimental groups, including DNaOHPNaOH, DNaOHPMg(OH)2, D Mg(OH)2PNaOH and DMg(OH)2PMg(OH)2, were studied in this paper. The results showed that the brightness and tensile strength of DMg(OH)2PMg(OH)2 pulp was slightly lower than that of DNaOHPNaOH pulp. But there were more residual ClO2 and residual H2O2 in the effluents of DMg(OH)2PMg(OH)2 bleaching process than that in the effluents of DNaOHPNaOH bleaching process, which illustrated that DMg(OH)2PMg(OH)2 bleaching process had higher bleaching efficiency than DNaOHPNaOH bleaching process. The influence of Mg(OH)2 replacing NaOH was more obvious when it was used in the bleaching process of P stage than that in the D stage. The replacement of NaOH with Mg(OH)2 in D Stage can lower the dosage of alkali used in the following P stage.

The Effect of Microwave Treatment on the Hydrogen Peroxide Bleaching of Soda-AQ Wheat Straw Pulp

2011 ◽  
Vol 236-238 ◽  
pp. 1307-1312
Author(s):  
Chao Jun Wu ◽  
Chuan Shan Zhao ◽  
Jun Li ◽  
Ke FU Chen
Keyword(s):  
Hydrogen Peroxide ◽  
Wheat Straw ◽  
Fiber Length ◽  
Weighted Average ◽  
Microwave Treatment ◽  
Arithmetic Average ◽  
Peroxide Bleaching ◽  
Bleached Pulp ◽  
Infra Red ◽  
Wheat Straw Pulp

In this paper, the effect of microwave treatment on the hydrogen peroxide bleaching of Soda-AQ wheat-straw pulp was investigated. The results showed that microwave treatment could increase the brightness of the hydrogen peroxide bleached pulp. The fiber coarseness of microwave enhancing peroxide bleached pulp was higher than that of the peroxide bleached pulp. However, the arithmetic average fiber length, the length weighted average fiber length and weight weighted average fiber length of the former was lower than that of the latter. Fourier transform infra-red spectroscopy (FTIR) and X-ray diffraction (XRD) spectra showed that CrI(%) crystallinity of microwave enhancing peroxide bleached pulp was similar as that of the peroxide bleached pulp but all higher than that of the Soda-AQ wheat-straw pulp. N·O′KI infra-red crystalline index of microwave enhancing peroxide bleached pulp were lower than that of the peroxide bleached pulp. The FTIR spectra of lignin showed that the microwave treatment had some influences on the methoxyl and phenolic group in lignin.

Xylanase and laccase aided bio-bleaching of wheat straw pulp

2013 ◽  
Vol 92 (1) ◽  
pp. 131-138 ◽  
Author(s):  
Bhavin S. Dedhia ◽  
Mangesh D. Vetal ◽  
Virendra K. Rathod ◽  
Csoka Levente
Keyword(s):  
Wheat Straw ◽  
Wheat Straw Pulp

Study of Selecting Proper Chitosan from Various Chitosan Sample as Paper Strengthening Agent

2011 ◽  
Vol 117-119 ◽  
pp. 1421-1424
Author(s):  
Yong Sheng Ma ◽  
Xian Hui Sun
Keyword(s):  
Wheat Straw ◽  
Strengthening Effect ◽  
Chitosan Sample ◽  
Viscosity Range ◽  
Wheat Straw Pulp

It is usually reported that chitosan is used as paper strengthening agent. However, it is sorry that the study choosing chitosan which DD (degree of de-acetyl )and viscosity is filtered by experiments is blank. Many chitosan samples of wide viscosity range and wide DD range were tested by their strengthening effect on bleched wheat straw pulp. Then a few sample of chitosan is selected because of their obvious strengthening effect on pulp. This study could be as the foundation of further research of chitosan used as paper strengthening agent.

Preparation and Properties of Multi-Layer Composite Paperboard

2013 ◽  
Vol 774-776 ◽  
pp. 1010-1013
Author(s):  
Quan Xiao Liu ◽  
Dan Xi Li ◽  
Fei Ma ◽  
Chang Qing Chen ◽  
Jun Yang
Keyword(s):  
Wheat Straw ◽  
Raw Materials ◽  
Pulp Fiber ◽  
Paper Pulp ◽  
Mechanical Pulp ◽  
Physical Strength ◽  
Chemical Pulp ◽  
Layer Composite ◽  
Wheat Straw Pulp ◽  
The Cost

In order to study the preparation and property of the multi layer composite paperboard, bleached wheat straw pulp, bleached chemical thermal mechanical pulp and waste newsprint pulp are used as raw materials to making paperboard. The results show that the bonding force between fibers of grasses chemical pulp is strong which can improve the bonding strength between the layers. Bleached wheat straw pulp is used as outer layer and waste news paper pulp is used as inner layer to make composite paperboard has high physical properties. Bleached chemical thermal mechanical pulp fiber is shorter, so paperboard tightness and physical strength reduce, which can be used as the lining of the multi layer composite paperboard to improve the stiffness of the paperboard and reduce the cost.

Enzymatic Treatment with Manganese Peroxidase fromPhanerochaete chrysosporiumfor Enhancing Wheat Straw Pulp Characteristics

Holzforschung ◽  
1997 ◽  
Vol 51 (6) ◽  
pp. 549-556 ◽  
Author(s):  
Jean-Claude Sigoillot ◽  
Michel Petit-Conil ◽  
Katia Ruel ◽  
Serge Moukha ◽  
Jean Comtat ◽  
...  
Keyword(s):  
Wheat Straw ◽  
Manganese Peroxidase ◽  
Enzymatic Treatment ◽  
Wheat Straw Pulp
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