نتایج جستجو برای: soda pulping

تعداد نتایج: 4835  

Journal: :پژوهش های علوم و فناوری چوب و جنگل 0

the present research has been conducted to investigate the soda and soda-anthraquiuone pulping from whole kenaf (v36). in this respect, anatomical characteristics of kenaf bast and core fibers as well as the soda and soda-aq pulp properties produced at four sodium hydroxide concentrations, namely 25, 30, 35 and 40 (g/lit), have been evaluated. the pulping results indicated that pulp yield and k...

Journal: :Molecules 2016
Fengxia Yue Ke-Li Chen Fachuang Lu

Wood shortages, environmental pollution and high energy consumption remain major obstacles hindering the development of today's pulp and paper industry. Energy-saving and environmental friendly pulping processes are still needed, especially for non-woody materials. In this study, soda-oxygen pulping of bagasse was investigated and a successful soda-oxygen pulping process for bagasse at 100 °C w...

Journal: :پژوهش های علوم و فناوری چوب و جنگل 0

soda and soda-aq pulping of corn stalk applying different charges of active alkali and pulping time was studied. the average value of fiber length, diameter and cell wall thickness were measured as 1.03 mm, 23.64 µm and 5.26 µm, respectively. the content of alcohol-acetone extractives, cellulose, lignin, extractives soluble in 1% naoh and ash content of corn stalk were determined as 15%, 51.2%,...

2010
GABRIELE SCHILD HERBERT SIXTA

In this study, multifunctional alkaline pulping was suggested to produce different pulp grades at one mill site, ranging from high-yield paper pulp to high-purity dissolving pulp. In all process modifications, sulfur was successfully replaced by anthraquinone. Autohydrolysis and alkaline pre-extraction were applied to Eucalyptus globulus wood chips, followed by kraft and soda-AQ pulping. Alkali...

2013
P. F. VENA M. P. GARCÍA-APARICIO M. BRIENZO J. F. GÖRGENS T. RYPSTRA

The extraction of hemicelluloses, which otherwise would be wasted in the black liquor, can be integrated with chemical pulping processes in a biorefinery approach that will generate a sugar-rich feedstock for production of fuels and chemicals. Extractions of hemicelluloses from sugarcane bagasse under dilute sulphuric acid or mild alkaline conditions were performed, using a central composite ex...

2015
P. F. VENA M. BRIENZO M. GARCÍA-APARICIO J. F. GÖRGENS T. RYPSTRA

The extraction of hemicelluloses prior to pulping is an attractive process to be incorporated in the pulp and paper mills to generate valuable by-products such as xylose and xylo-oligomers in addition to core products. This paper investigates the impact of xylan extraction by dilute acid on cooking conditions, pulp yield and properties during kraft and soda-AQ pulping of Eucalyptus grandis wood...

2012
Zarita Zainuddin Wan Rosli Wan Daud Pauline Ong Amran Shafie

Wavelet neural networks (WNNs) were used to investigate the influence of operational variables in the soda-ethanol pulping of oil palm fronds (viz. NaOH concentration (10-30%), ethanol concentration (15-75%), cooking temperature (150-190 oC), and time (60-180 min)) on the resulting pulp and paper properties (viz. screened yield, kappa number, tensile index, and tear index). Performance assessme...

Journal: :جنگل و فرآورده های چوب 0
محمد حسین کربلایی اسمعیل گروه علوم و صنایع چوب و کاغذ، دانشگاه آزاد اسلامی واحد کرج، کرج، ایران احمد جهان لتیباری دانشگاه آزاد اسلامی – واحد کرج کرج – مهرشهر – بلوار امام خمینی (ره) – بلوار آزادی – دانشکده کشاورزی و منابع طبیعی سید محمد جواد سپیده دم استادیار، گروه علوم و صنایع چوب و کاغذ، دانشگاه آزاد اسلامی واحد کرج، کرج، ایران مهران روح نیا گروه علوم و صنایع چوب و کاغذ، دانشگاه آزاد اسلامی واحد کرج، ، ایران

the kinetics of old corrugated container (occ) soda-oxygen delignification was investigated. three delignification temperatures (145,165 and 175ºc) were applied. the pulping duration was adjusted at 150 minutes and the measurements were conducted at 10 minutes intervals. the pulping consistency, oxygen pressure and active alkali were constant at 10%, 6 bar and 18% naoh respectively in all pulpi...

2014
Haichao Li Huizhen Sun Ling Pu Zhibin He

Cellulosic pulps were prepared from Stellera chamaejasme roots using soda, soda-anthraquinone (soda-AQ), and kraft pulping processes. S. chamaejasme is composed of 73.5% holocellulose, 39.7% α-cellulose, and 17.6% lignin, similar to wheat straw and other non-wood plant materials. The ethanol–benzene extractives content of 9.2% is higher than other non-woods. The conditions used for all pulping ...

1998
Behzad C. Ahvazi Gerry Pageau Dimitris S. Argyropoulos

This paper describes our efforts focused at defining the formation of diphenylmethane moieties in lignin during conventional kraft and soda pulping conditions. This objective was realized by confirming, initially, the assignment of a P NMR signal as being due exclusively to the presence of phosphitylated diphenylmethane (DPM) phenolic hydroxyl groups. More specifically, softwood milled wood lig...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید