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Production capacities of all woodpulp mills in the United States are identified by location, ownership, and process type. For each mill, production capacity is reported for the year 2000 by process type; total mill capacities are also reported for 1961, 1965, 1979, 1974, and 1983. In addition, the…
Author(s): Brett R. Smith, Robert W. Rice, Peter J. Ince
Keywords: Woodpulp capacity, pulp mills, capacity trends, geographic distribution
Source: Gen. Tech. Rep. FPL-139. Madison, WI: U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, 2003. 23 pages.
Year: 2003
The Chemical Safety and Hazards Investigation Board has recently encouraged chemical engineering faculty to address student knowledge about reactive hazards in their curricula. This paper presents a simple approach that may be used to illustrate the importance of these types of safety…
Author(s): Peter W. Hart, Alan W. Rudie
Keywords: Decomposition, contamination, risk management, explosives, safety measures, wood-pulp industry, bleaching, pulping, hydrogen peroxide, oxidation, industrial safety, pulp mills, catalysis, chemical reactions, pressure, industrial chemistry, kinetics, pulp bleaching, explosions
Source: Chemical engineering education. Vol. 45, no. 1 (winter 2011): p. 15-20.
Year: 2011
Pulpwood production in the South rose a modest 7 percent in 1979 to 54 million cords. Of the increase, 55 percent was from roundwood and 45 percent was from plant byproducts. Pulping capacity of the 115 mills in the South also rose 7 percent to over 110,000 tons per day.
Author(s): Thomas R. Bellamy, Cecil C. Hutchins
Keywords: pulpwood, roundwood, residues, pulp mills
Source: Resour. Bull. SE-57. Asheville, NC: U.S. Department of Agriculture, Southeastern Forest Experiment Station. 31 p.
Year: 1979
The majority of the barium present in the pulping process exits the digester as barium carbonate. Barium carbonate dissolves in the bleach plant when the pH drops below 7 and, if barium and sulfate concentrations are too high, begins to precipitate as barium sulfate. Barium is difficult to control…
Author(s): Alan W. Rudie, Peter W. Hart
Keywords: Barium carbonate, chlorine dioxide, bleaching, barium sulphate, water quality management, barium, water pollution, pulping, wood-pulp, bleaching, pulp mills, incrustations, scale, digesters, pulp and paper processes, trace metals
Source: 2006 Engineering, Pulping, and Environmental Conference, Nov. 5-8, 2006, Atlanta, GA. Atlanta, GA : TAPPI, 2006: [10] pages.
Year: 2006
The growth of pulp and paper mills in the US from 1970 to 2000 depended mostly on size and age. Mills grew according to Gibrat’s law, and post-1970 mills grew faster than pre-1971 mills. Mills stopped growing at approximately 22 years of age. But most mills survived beyond that, thus growth was not…
Author(s): Xiaolei Li, Joseph Buongiorno, Peter J. Ince
Keywords: Growth, pulp, paper, paperboard, econometrics, location, capacity, exit-life cycle, survival, paper industry, forecasting, wood-pulp industry, supply and demand, market surveys, paperboard industry, economic aspects, paper mills, pulp mills, econometric models
Source: Journal of forest economics. Vol. 10 (2004): pages 3-19.
Year: 2004
This paper will present several successful case studies where scale has been eliminated in mills including calcium carbonate scale in a white liquor strainer, calcium oxalate scale in the D0 stage, enzymatic treatment of brown stock to eliminate oxalate scale, and control of barium sulfate scale.
Author(s): Peter W. Hart, Alan W. Rudie
Keywords: Incrustations, pulp mills, solubility, barium sulfate, enzymes, calcium carbonate, pulping, bleaching, calcium oxalate, case studies, digesters, pulp and paper processes, white liquor, chemical precipitation, scale
Source: Proceedings of the 2005 TAPPI Engineering, Pulping & Environmental Conference : 2005 August 28-31, Philadelphia, PA : Sessions 24-56 : presentations, book 2. Norcross, Ga. : TAPPI Press, c2005: ISBN: 1595100954: [9] pages.
Year: 2005
The mineral scale that deposits in digesters and bleach plants is formed by a chemical precipitation process. As such, it is accurately described or modeled using the solubility product equilibrium constant. Although solubility product identifies the primary conditions that need to be met for a…
Author(s): Alan W. Rudie, Peter W. Hart
Keywords: Calcium oxalate, temperature, pulp mills, incrustations, bleaching, acid-base equilibrium, solubility, Gibbs' free energy, ionic strength, pulp and paper processes, digesters, chemical precipitation, scale
Source: Proceedings of the 2005 TAPPI Engineering, Pulping & Environmental Conference : 2005 August 28-31, Philadelphia, PA. Norcross, GA : TAPPI Press, c2005: ISBN: 1595100954: [10] pages.
Year: 2005
Mineral scale increases operating costs, extends downtime, and increases maintenance requirements. This paper presents several successful case studies detailing how mills have eliminated scale. Cases presented include calcium carbonate scale in a white liquor strainer, calcium oxalate scale in the…
Author(s): Peter W. Hart, Alan W. Rudie
Keywords: Pulping, enzymes, industrial applications, lime, bleaching, barium sulphate, pulp mills, incrustations, calcium carbonate, calcium oxalate, sodium sesquisulphate, chemithermomechanical pulping
Source: Tappi. Vol. 5, no. 6 (June 2006): Pages 22-27
Year: 2006
The mineral scale that deposits in digesters and bleach plants is formed by a chemical precipitation process.As such, it is accurately modeled using the solubility product equilibrium constant. Although solubility product identifies the primary conditions that must be met for a scale problem to…
Author(s): Alan W. Rudie, Peter W. Hart
Keywords: Calcium carbonate, ion exchange, acid-base equilibrium, anions, chemical equilibrium, anions, chemical equilibrium, precipitation, calcium oxalate, pulping, pulp mills, incrustations, solubility, barium sulphate, wood-pulp, bleaching, chlorine dioxide, lime, digesters, pulp and paper processes
Source: Tappi journal. Vol. 5, no. 7 (2006) pages 17-23.
Year: 2006
To comply with the U.S. Environmental Protection Agency's "Cluster Rule," most U.S. mills have switched from the use of chlorine to chlorine dioxide as the oxidant in the first stage of bleaching. This process change has a downside. it increases the formation of mineral scale in bleach plants.…
Author(s): Alan Rudie, Peter Hart
Keywords: Incrustations, pulp mills, bleaching, oxalic acid, calcium oxalate, mathematical models, pulp and paper processes, scale, digesters, chemical precipitation
Source: Solutions : for people, processes and paper. (June 2005): Pages 45-46
Year: 2005
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