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Magazine articles
Diverse program offered at annual coating and graphic arts division conference, TAPPI JOURNAL, August 1993, Vol. 76(8)
Diverse program offered at annual coating and graphic arts division conference, TAPPI JOURNAL, August 1993, Vol. 76(8)
Journal articles
Magazine articles
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.
Magazine articles
1990 TAPPI nonwovens conference: keynote on environment, TAPPI JOURNAL, August 1990, Vol. 73(8)
1990 TAPPI nonwovens conference: keynote on environment, TAPPI JOURNAL, August 1990, Vol. 73(8)
Magazine articles
Highly alloyed stainless steels to cope with corrosion, TAPPI JOURNAL, December 1990, Vol. 73(12)
Highly alloyed stainless steels to cope with corrosion, TAPPI JOURNAL, December 1990, Vol. 73(12)
Magazine articles
Conversion from acid to alkaline with a film transfer size press, TAPPI JOURNAL, June 1991, Vol. 74(6)
Conversion from acid to alkaline with a film transfer size press, TAPPI JOURNAL, June 1991, Vol. 74(6)
Magazine articles
Factors affecting the fabrication of corrosion barriers for rp equipment in bleaching environments, TAPPI JOURNAL, September 1995, Vol. 78(9)
Factors affecting the fabrication of corrosion barriers for rp equipment in bleaching environments, TAPPI JOURNAL, September 1995, Vol. 78(9)
Journal articles
Magazine articles
Dynamic CFD modeling of calcination in a rotary lime kiln with an external dryer, TAPPI Journal August 2023
ABSTRACT: Mid-kiln ring formation is a problem in lime kilns that may be related to fluctuations in the start location of calcination. To calculate fluctuations in bed and gas temperature profiles within a lime kiln with an external dryer, a dynamic two-dimensional (2D) axisymmetric computational fluid dynamics (CFD) gas model with a methane burner implemented in ANSYS Fluent, coupled by mass and heat balances to a one-dimensional (1D) bed model, was developed. The dynamic model was used to calculate changes in the location where calcination starts with fluctuations in operational conditions using pulp mill data. This model simulates radiative, convective, and conductive heat transfer between the gas, wall, and bed to determine the axial bed temperature in the kiln. The calcination reaction is described using a shrinking core model that allows for the prediction of the location at which calcination begins and the degree of calcination achieved. The solid motion within the kiln is modeled using Kramer’s equation modified for transient response. Steady-state and dynamic simulation results were compared to data from an industrial dry lime kiln, and good agreement was found. A sensitivity analysis was also performed to provide insight on how operating conditions and model variables impact the calcination location and degree of calcination. Of the variables examined, the fuel rate and the feed temperature had the largest impact on both the calcination location and degree of calcination in the kiln. Model predictions of a period of ring formation in the industrial kiln showed that the start location of calcination fluctuated by more than 2 m on either side of the mean of regular operation, warranting further investigation of the importance of these fluctuations on mid-kiln ring formation.
Magazine articles
The 11th fundamental research symposium investigates papermaking materials, TAPPI JOURNAL, February 1998, Vol. 81(2)
The 11th fundamental research symposium investigates papermaking materials, TAPPI JOURNAL, February 1998, Vol. 81(2)
Magazine articles
English as a first and second language - part 6: avoiding grammar traps, TAPPI JOURNAL, September 1998, Vol. 81(9)
English as a first and second language - part 6: avoiding grammar traps, TAPPI JOURNAL, September 1998, Vol. 81(9)
Magazine articles
Forest products industry partners with government on r&d projects, TAPPI JOURNAL, April 1999, Vol. 82(4)
Forest products industry partners with government on r&d projects, TAPPI JOURNAL, April 1999, Vol. 82(4)