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Formic acid pulping process of rice straw for manufacturing of cellulosic fibers with silica, TAPPI Journal August 2021
ABSTRACT: Emerging technology has the potential to develop entirely new approaches for producing cellulose fiber-based materials along with fuels and chemical raw materials like lignin and furfural. Rice straw is a rich source of cellulosic fibers and inorganic micronic-sized particles termed as ash. They can prove helpful in development of new or enhanced agricultural residue-based materials and products that offer cost effective substitutes for nonrenewable materials used in different domestic and industrial applications. Lignocellulose is an abundant material that is submicronic at the basic level. Rice straw is a fibrous lignocellulosic material obtained as agricultural residue, but it differs from most crop residues in its high content of silicon dioxide (SiO2). Ash content on a dry weight basis ranges from 13% to 20%, varying according to the state of conservation of the straw after harvest. The ash in rice straw has nearly 75% SiO2. The particle size analysis shows variation from a few microns to hundreds of microns for inorganic residues left after burning at high temperatures above 550°C. Proximate analysis of rice straw shows that it contains 54% to 56% holocellulose and 15% to 18% lignin, both of which are natural biopolymers. The compound analysis shows the different compounds present in rice straw ash.Rice straw is available in hundreds of million tons in India and other Asian countries, so suitable technologies are required to convert rice straw from a biomass waste to useful bioproducts like pulp, paper, and paperboard. This research paper is intended to obtain pulp with fibers having inherent silica present in it to give high opacity paper and better bonding between fibers.
Journal articles
Magazine articles
Technological evaluation of Pinus maximinoi wood for industrial use in kraft pulp production, TAPPI Journal August 2021
ABSTRACT: This study characterized Pinus maximinoi wood and evaluated its performance for pulp production. Samples of Pinus taeda wood were used as reference material. For both species, wood chips from 14-year-old trees were used for the technological characterization, pulping, bleaching process analysis, and pulp properties. A modified kraft pulping process was carried out targeting kappa number 28±5% on brownstock pulp. The bleaching sequence was applied for bleached pulp with final brightness of 87±1 % ISO. Refinability and resistance properties were measured in the bleached pulps. Compared to P. taeda wood, P. maximinoi showed slightly higher basic density (0.399 g/cm³) and higher holocellulose (64.5%), lignin (31.1%), and extractives content (4.5%), along with lower ash content (0.16%). P. maximinoi tracheids showed greater wall thickness (6.4 µm) when compared to P. taeda tracheids. For the same kappa number, P. maximinoi and P. taeda resulted in similar screened yield, with an advantage observed for P. maximinoi, which resulted in lower specific wood consumption (5.281 m³/o.d. metric ton), and lower black liquor solids (1.613 metric tons/o.d. metric ton). After oxygen delignification, P. maximinoi pulp showed higher efficiency on kappa reduction (67.2%) and similar bleaching chemical demand as P. taeda pulp. Compared to P. taeda pulps, the refined P. maximinoi pulps had similar results and the bulk property was 10% higher. Results showed that P. maximinoi is an interesting alternative raw material for softwood pulp production in Brazil.
Journal articles
Magazine articles
Can carbon capture be a new revenue opportunity for the pulp and paper sector?, TAPPI Journal August 2021
ABSTRACT: Transition towards carbon neutrality will require application of negative carbon emission technologies (NETs). This creates a new opportunity for the industry in the near future. The pulp and paper industry already utilizes vast amounts of biomass and produces large amounts of biogenic carbon dioxide. The industry is well poised for the use of bioenergy with carbon capture and storage (BECCS), which is considered as one of the key NETs. If the captured carbon dioxide can be used to manufacture green fuels to replace fossil ones, then this will generate a huge additional market where pulp and paper mills are on the front line. The objective of this study is to evaluate future trends and policies affecting the pulp and paper industry and to describe how a carbon neutral or carbon negative pulp and paper production process can be viable. Such policies include, as examples, price of carbon dioxide allowances or support for green fuel production and BECCS implementation. It is known that profitability differs depending on mill type, performance, energy efficiency, or carbon dioxide intensity. The results give fresh understanding on the potential for investing in negative emission technologies. Carbon capture or green fuel production can be economical with an emission trade system, depending on electricity price, green fuel price, negative emission credit, and a mill’s emission profile. However, feasibility does not seem to evidently correlate with the performance, technical age, or the measured efficiency of the mill.
INTERACTION BETWEEN AQ AND SULFIDITY ON YIELD AND PULP STRENGTH IN KRAFT COOKING OF MIXED NORTHERN HARDWOODS, 2002 Kraft Pulp Yield Symposium
INTERACTION BETWEEN AQ AND SULFIDITY ON YIELD AND PULP STRENGTH IN KRAFT COOKING OF MIXED NORTHERN HARDWOODS, 2002 Kraft Pulp Yield Symposium
BOOSTING PULP YIELD OF WESTERN SOFTWOOD WITH ANTHRAQUINONE/POLYSULFIDE KRAFT PULPING, 2002 Kraft Pulp Yield Symposium
BOOSTING PULP YIELD OF WESTERN SOFTWOOD WITH ANTHRAQUINONE/POLYSULFIDE KRAFT PULPING, 2002 Kraft Pulp Yield Symposium
EFFECT OF SODIUM SULFIDE PRETREATMENT ON KRAFT PULPING, 2002 Kraft Pulp Yield Symposium
EFFECT OF SODIUM SULFIDE PRETREATMENT ON KRAFT PULPING, 2002 Kraft Pulp Yield Symposium
Variability in pulping and fiber characteristics of hybrid poplar trees due to their genetic makeup, environmental factors, and tree age, 2002 Kraft Pulp Yield Symposium
Variability in pulping and fiber characteristics of hybrid poplar trees due to their genetic makeup, environmental factors, and tree age, 2002 Kraft Pulp Yield Symposium
ANTHRAQUINONE AND SURFACTANT PULPING TECHNOLOGY FOR KRAFT SOFTWOOD, 2002 Kraft Pulp Yield Symposium
ANTHRAQUINONE AND SURFACTANT PULPING TECHNOLOGY FOR KRAFT SOFTWOOD, 2002 Kraft Pulp Yield Symposium
Ethanolâ?¢kraft pulping and papermakingproperties of aspen and spruce Part II:Delignification kinetics,activation thermodynamics,and pulping productivity, 2002 Kraft Pulp Yield Symposium
Ethanol•kraft pulping and papermakingproperties of aspen and spruce Part II:Delignification kinetics,activation thermodynamics,and pulping productivity, 2002 Kraft Pulp Yield Symposium
Kraft pulping of coastal softwoodfrom British Columbia using AQand a digester additive, 2002 Kraft Pulp Yield Symposium
Kraft pulping of coastal softwoodfrom British Columbia using AQand a digester additive, 2002 Kraft Pulp Yield Symposium