scholarly journals Feasibility study on the reuse of waste alkali from rayon manufacturing process for cotton fabric pretreatment

2019 ◽  
Vol 14 ◽  
pp. 155892501989895
Author(s):  
Weiming Wang ◽  
Bo Yu ◽  
Aixue Dong
Keyword(s):  
Hydrogen Peroxide ◽  
Sodium Hydroxide ◽  
Cotton Fabric ◽  
Manufacturing Process ◽  
Alkali Solution ◽  
Alkaline Condition ◽  
Fiber Damage ◽  
Treatment Conditions ◽  
One Step ◽  
Pretreatment Temperature

The feasibility of reuse waste alkali solution from rayon manufacturing process to replace solid sodium hydroxide for cotton fabric one-bath-one-step pretreatment had been investigated. Under alkaline condition, hydrogen peroxide decomposition rate could be accelerated by a little amount of cobalt chloride. To obtain a similar decomposition value of hydrogen peroxide, the required temperature for waste alkali solution was lower than that of solid sodium hydroxide, and the lower value is about 10°C. The pretreatment temperature could be reduced by 15°C when waste alkali solution was used as alkali agent to replace solid sodium hydroxide, while the treatment conditions should be strictly controlled to diminish fiber damage. According to the demands of dyeing and printing products, a desired pretreated cotton fabric could be successfully prepared when the alkali waste from rayon manufacturing process was used as substitute for solid sodium hydroxide in one-bath-one-step pretreatment of cotton fabric.

scholarly journals Oxidation of Cellulose from Oil Palm Empty Fruit Bunch Using Hydrogen Peroxide in Alkaline Condition

2018 ◽  
Vol 8 (02) ◽  
pp. 51 ◽  
Author(s):  
Isroi Isroi ◽  
Adi Cifriadi
Keyword(s):  
Hydrogen Peroxide ◽  
Sodium Hydroxide ◽  
Sodium Hypochlorite ◽  
Oil Palm ◽  
Visual Analysis ◽  
Alkaline Condition ◽  
Cellulose Content ◽  
Empty Fruit Bunch ◽  
Cellulose Oxidation ◽  
Oxidation Effect

There are growing interest to use cellulose as renewable material in order to replace non-renewable polymeric materials. Alteration and chemical modifications of the cellulose by oxidation is needed to improve its properties and functionality. The aim of this study was to evaluate oxidation effect of the cellulose from oil palm empty fruit bunch (OPEFB) using hydrogen peroxide in alkaline condition. Cellulose has been isolated and purified by sodium hydroxide method followed by sodium hypochlorite bleaching. The oxidation effect of the cellulose by hydrogen peroxide was investigated by component analysis of the lignocelluloses, visual analysis, physical and chemical properties. Fourier transform infrared spectroscopy was employed to evaluate the changes of functional groups. Digesting of the OPEFB by sodium hydroxide at temperature 160oC for 4 hours reduced lignin content from 22.58% to 16.60%, increase cellulose and hemicelluloses content from 60.76% to 73.87% and 25.86% to 30.95%, respectively. Treatment of the OPEFB pulp using sodium hypochlorite removed all residual lignin. Cellulose content was increased up to 90.86%. Degree of polymerization of the oxidized cellulose was reduced from 1997 to 658. Carboxyl groups of celluloses was significantly increased and confirmed by titration analysis. OPEFB cellulose fiber was damage and broken, meanwhile crystallinity of the cellulose was reduced.Keywords: cellulose, oxidation, oil palm empty fruit bunch, carboxyl group, crystallinity, physical properties Oksidasi Selulosa dari Tandan Kosong Kelapa Sawit menggunakan Hidrogen Peroksida dalam Kondisi BasaAbstrakPerhatian untuk memanfaatkan selulosa sebagai polimer terbarukan untuk menggantikan polimer tidak terbarukan mengalami peningkatan. Perubahan dan modifikasi kimia selulosa melalui proses oksidasi diperlukan untuk meningkatkan sifat dan fungsi selulosa. Penelitian ini bertujuan untuk mempelajari pengaruh oksidasi selulosa dari tandan kosong kelapa sawit (TKKS) menggunakan hidrogen peroksida dalam suasana basa. Selulosa diisolasi dan dimurnikan dengan metode natrium hidroksida dan dilanjutkan dengan pemutihan natrium hipoklorit. Efek oksidasi selulosa oleh hidrogen peroksida dievaluasi menggunakan analisis komponen lignoselulosa, analisis visual, sifat fisik dan kimia. Analisis spektroskopi inframerah (FTIR) digunakan untuk mengevaluasi perubahan gugus fungsional selulosa. Pemasakan TKKS dengan natrium hidroksida pada suhu160oC selama 4 jam mengurangi kandungan lignin dari 22,58% menjadi 16,60%, meningkatkan kandungan selulosa dari 60,76% menjadi 73,87% dan hemiselulosa dari 25,86% menjadi 30,95%. Perlakuan pulp TKKS menggunakan natrium hipoklorit menghilangkan semua sisa lignin. Kandungan selulosa meningkat hingga 90,86%. Oksidasi selulosa dengan hidrogen peroksida menurunkan derajat polimerisasi selulosa dari 1997 menjadi 658. Gugus karboksil selulosa meningkat secara signifikan dan dikonfirmasi dengan analisis titrasi. Analisis visual menunjukkan kerusakan serabut selulosa, sesuai dengan pengurangan kristalinitas selulosa.Kata kunci: selulosa, oksidasi, tandan kosong kelapa sawit, gugus karboksil, kristalinitas, sifat fisik 

Bleaching optimization at WestRock mill in Covington, Virginia

TAPPI Journal ◽  
2016 ◽  
Vol 15 (9) ◽  
pp. 581-586 ◽  
Author(s):  
RICARDO B. SANTOS ◽  
PETER W. HART ◽  
DOUGLAS C. PRYKE ◽  
JOHN VANDERHEIDE
Keyword(s):  
Hydrogen Peroxide ◽  
Sodium Hydroxide ◽  
Chlorine Dioxide ◽  
Capital Expenditures ◽  
Equipment Repair ◽  
Optimization Program ◽  
Hardwood Pulp ◽  
Improved Performance

The WestRock mill in Covington, VA, USA, initiated a long term diagnostic and optimization program for all three of its bleaching lines. Benchmarking studies were used to help identify optimization opportunities. Capital expenditures for mixing improvement, filtrate changes, equipment repair, other equipment changes, and species changes were outside the scope of this work. This focus of this paper is the B line, producing southern hardwood pulp in a D(EP)DD sequence at 88% GE brightness. The benchmarking study and optimization work identified the following opportunities for improved performance: nonoptimal addition of caustic and hydrogen peroxide to the (EP) stage, carryover of D0 filtrate to the (EP) stage, and carryover of (EP) filtrate to the D1 stage. As a result of actions the mill undertook to address these opportunities, D0 kappa factor decreased about 5%, sodium hydroxide consumption in the (EP) stage decreased about 35%, chlorine dioxide consumption in the D1 stage decreased about 25%, and overall bleaching cost decreased about 15%.

One-Step Oxidation of Benzene Producing Eight High Value Compounds Using Nitric Acid and Hydrogen Peroxide

2015 ◽  
Vol 19 (0) ◽  
pp. 55-58
Author(s):  
Zhen-xue Liu ◽  
◽  
Zhong-xue Gan ◽  
Jun-jie Gu ◽  
Qing-feng Song
Keyword(s):  
Hydrogen Peroxide ◽  
Nitric Acid ◽  
One Step ◽  
Oxidation Of Benzene

Production of monosaccharides from poplar by a two-step hydrogen peroxide-acetic acid and sodium hydroxide pretreatment

2021 ◽  
Vol 170 ◽  
pp. 113820
Author(s):  
Hong Liao ◽  
Jiaxin You ◽  
Peiyao Wen ◽  
Wenjun Ying ◽  
Qianqian Yang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Sodium Hydroxide

Fast one-step synthesis of N-doped carbon dots by pyrolyzing ethanolamine

2014 ◽  
Vol 2 (36) ◽  
pp. 7477-7481 ◽  
Author(s):  
Xinwei Dong ◽  
Yanjie Su ◽  
Huijuan Geng ◽  
Zhongli Li ◽  
Chao Yang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Carbon Dots ◽  
High Yield ◽  
One Step ◽  
Doped Carbon Dots

N-doped CDs can be obtained directly with high yield by pyrolyzing ethanolamine in air within just 7 minutes with the assistance of hydrogen peroxide.

scholarly journals Influence of the fluorescent brightener Periblanc BA on the degree of whiteness of the knitted cotton fabric

2011 ◽  
Vol 65 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Milena Miljkovic ◽  
Milovan Purenovic ◽  
Mile Novakovic ◽  
Sonja Randjelovic
Keyword(s):  
Hydrogen Peroxide ◽  
Cotton Fabric ◽  
Whiteness Index ◽  
Fluorescent Brightener ◽  
Single Bath ◽  
Optical Bleaching ◽  
The One ◽  
Experimental Runs ◽  
Exhaustion Method

In this study the influence of the different fluorescent brightener Periblanc BA concentrations on the degree of knitted cotton fabric whiteness was investigated. Two consecutive experimental runs were performed. The first was the bleaching of the knitted cotton fabric with hydrogen peroxide using the methods of two and single bath exhaustion while the second was the optical bleaching with fluorescent brightener Periblanc BA using the exhaustion method. CIE Whiteness Index and Tint value were measured on the Color-Eye 3000 spectrophotometer at the standard illuminant D65 (Ice-Texicon, d/8, D65/10?) while K/S values were determined using the Kubelka Munk equation. The results show that cotton fabric bleached with fluorescent brightener Periblanc BA after bleaching with hydrogen peroxide using two bath exhaustion method has higher degree of whiteness (118.8) with a reddish tint in comparison to the one bleached with hydrogen peroxide using single bath method (106.1).

The application of inexpensive and synthetic simple electrocatalyst CuFe-MoC@NG in immunosensor

The Analyst ◽  
2021 ◽  
Author(s):  
Lisha Mei ◽  
Wentang Zhao ◽  
Yiju Song ◽  
Li Zhang ◽  
Mengmeng Zhang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Precious Metal ◽  
Doped Graphene ◽  
One Step ◽  
Metal Materials ◽  
First Time

In this study, we used inexpensive and synthetic simple electrocatalysts replacement conventional precious metal materials to reduce hydrogen peroxide (H2O2). We first time developed N-doped graphene-coated CuFe@MoC using one-step calcination...

scholarly journals A facile and effective method for preparation of 2.5-furandicarboxylic acid via hydrogen peroxide direct oxidation of 5-hydroxymethylfurfural

2017 ◽  
Vol 19 (1) ◽  
pp. 11-16 ◽  
Author(s):  
Shuang Zhang ◽  
Long Zhang
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Oxidation Mechanism ◽  
Molar Ratio ◽  
Alkaline Condition ◽  
Optimal Parameters ◽  
Direct Oxidation ◽  
Reaction Parameters ◽  
Alkaline Conditions ◽  
Furandicarboxylic Acid

Abstract In this paper, 2,5-furandicarboxylic acid (FDCA) was efficiently prepared by the direct oxidation of 5-hydroxymethylfurfural (5-HMF) using hydrogen peroxide (H2O2) in alkaline conditions without any catalysts. The effects of reaction parameters on the process were systematically investigated and the optimal parameters were obtained as follows: molar ratio of 5-HMF:KOH:H2O2 was 1:4:8, reaction temperature and reaction time were determined as 70°C and 15 minutes, respectively. Under these conditions, the yield of FDCA was 55.6% and the purity of FDCA could reach 99%. Moreover, we have speculated the detailed oxidation mechanism of 5-HMF assisted by hydrogen peroxide in alkaline condition to synthesize FDCA.

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