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Title Nitric acid digestion of logging residues of red spruce: pulp yield and physical properties
Creator/Author Kurrle, F.L.
Publication Date1963 Apr 01
OSTI IdentifierOSTI ID: 5669778
Other Number(s)CODEN: TAPPA
Resource TypeJournal Article
Resource RelationTappi ; Vol/Issue: 46:4
Research OrgWest Virginai Pulp and Paper Co., Luke, MD
Subject320300 -- Energy Conservation, Consumption, & Utilization-- Industrial & Agricultural Processes ;140504 -- Solar Energy Conversion-- Biomass Production & Conversion-- (-1989); ;PAPER-- WASTE PRODUCT UTILIZATION;WOOD-- ACID HYDROLYSIS;WOOD WASTES-- ACID HYDROLYSIS; BIOMASS PLANTATIONS;CHEMICAL REACTION YIELD;COMPARATIVE EVALUATIONS;EFFICIENCY;NITRIC ACID;SLURRIES
Related SubjectCHEMICAL REACTIONS;DECOMPOSITION;DISPERSIONS;HYDROGEN COMPOUNDS;HYDROLYSIS;INORGANIC ACIDS;LYSIS;MIXTURES;SOLID WASTES;SOLVOLYSIS;SUSPENSIONS;WASTES;YIELDS
Description/Abstract The ever increasing consumption of paper products has initiated a trend toward more complete wood fiber utilization in the United States.^To utilize logging residues efficiently, many technical and economic problems are encountered before, during, and after the pulping operation.^An investigation was conducted into the possibilities of utilizing normally unused tree components.^The objectives of this study were (1) to make a comparative yield study on the trunk, unmerchantable top, roots (4 in.+), roots (1 to 4 in.), and branch components of a tree; and (2) in contrast the physical and chemical characteristics of the processed pulps from the distinct components.^Six red spruce trees (Picea rubens) were selected in the University Forest for the comparative pulping study.^Wood was gathered from the distinct components in sufficient quantity for the pulping operation.^The unbarked components were processed with standard chipping and screening equipment prior to the pulping study.^Nitric acid was utilized in the three series of cooks conducted.^A caustic extraction preceded standard screening of the wood fiber.^Screened yields were obtained and standard TAPPI physical and chemical tests were performed.^Results indicated that comparative yields of 35 to 39% could be obtained from a majority of tree components, with the branches being a notable exception (28%).^Chemical and physical tests illustrated the comparative characteristics of pulps produced from the distinct components.^The root and unmerchantable top components showed the highest brightness values.^Appreciably lower initial freeness values noted in the branch components were due to smaller average fiber length.^Dirt counts showed that the presence of bark seriously affected the cleanliness of the pulp.^Comparable pulp strength values were displayed in most of the residual tree components.^In many cases individual values were somewhat lower than those of the trunk component.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 267-272
System Entry Date2001 May 13

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