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The influence of properties in cellulose pulps on the reactivity in viscose manufacturing
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
2011 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 26, no 1, 81-89 p.Article in journal (Refereed) Published
Abstract [en]

This paper describes properties in cellulose pulps to adress the increased quality demands on pulps for viscose production. Several grades of cellulose pulps were selected to investigate their chemical reactivity based on pulping process, original wood type and intrinsic viscosity. In total, six sulfite pulps and four sulfate pulps were chosen, of which all but one sulfate pulp were of dissolving grade. The physical and chemical properties of the pulps were tested. The influence of these properties on xanthation and viscose manufacturing as well as their correlation to each of the three selection criteria was investigated by the use of multivariate data analyses. Two methods to describe cellulose reactivity were used: a laboratory scale viscose test method for cellulose reactivity (Fock) and a filter clogging test for viscose dope. It was shown that all pulps chosen in this investigation formed groups according to all three selection criteria using principal component analysis. The analysis shows that sulfite pulps, from both wood types, are strongly correlated to the variables Fock reactivity, pore size and concentration of extractives. Sulfate pulps, however, are separated into two groups, hardwood and softwood. Hardwood sulfate pulps are strongly described by the variables permeability, content of hemicelluloses and filter clogging value. Softwood sulfate pulps, on the other hand, are described by variables such as alpha cellulose content, R10 and R18. Partial least square regression showed that Fock reactivity is influenced by the following cellulose pulp properties, in order of importance: absorption rate with caustic, pore area, permeability and pore diameter. The main property affecting the filter clogging value of the viscose dope is pulp permeability, followed by pore diameter, content of hemicelluloses, R18 and pore area.

Place, publisher, year, edition, pages
Stockholm: Nordic Pulp & Paper Research Journal , 2011. Vol. 26, no 1, 81-89 p.
Keyword [en]
Cellulose pulp, Filter clogging value, Long fiber, Short fiber, Sulfate pulp, Sulfite pulp, Reactivity, Multivariate data analysis, Viscose
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:umu:diva-50770DOI: 10.3183/NPPRJ-2011-26-01-p081-089ISI: 000293770200008OAI: oai:DiVA.org:umu-50770DiVA: diva2:468633
Available from: 2011-12-21 Created: 2011-12-21 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Characterization of cellulose pulps and the influence of their properties on the process and production of viscose and cellulose ethers
Open this publication in new window or tab >>Characterization of cellulose pulps and the influence of their properties on the process and production of viscose and cellulose ethers
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Today’s market offers an ever-increasing range of cellulose pulps (derivative pulps) made fromvarious wood types through different delignification processes. Each pulp segment has its uniquecharacteristics, which makes it difficult for the producer of cellulose derivatives to choose the mostsuitable pulp for optimum processability and product quality. The objective of this study was toimprove knowledge of cellulose pulps and to describe how different pulp properties affectprocessability and quality in the production of viscose dope and cellulose ethers.Ten pulp samples were investigated, originating from both sulfite and sulfate processes, with highand low viscosities and with softwood and hardwood as raw material. The pulps were analyzed fortheir properties and then processed to viscose dope and a cellulose ether in two separate pilotfacilities. The intermediates in the viscose process as well as the quality of the viscose dope andcellulose ether were analyzed and the results correlated to pulp properties.Multivariate regression methods were applied to investigate the dominating physical and chemicalproperties of each pulp and pulp segment, and to study the use of spectroscopic analyses inpredicting pulp origin, concentration and composition of hemicelluloses as well as the content ofreducing end groups in cellulose. For the production of viscose dope, the models presented showedthe most important pulp properties for good cellulose reactivity and viscose filterability. In addition,the properties affecting gel formation, flocculation, degree of substitution and clarity in theproduction of cellulose ether were highlighted. The study also emphasized the need to supplementthe use of conventional analyses on pulps and viscose intermediates with other analytical methods,such as molecular weight distribution and carbohydrate analysis, to better predict the quality ofboth viscose dope and viscose fiber.The results of the present study could be useful to predict the origin and properties of new pulps, toreplace or supplement otherwise expensive pulp analyses, and to assess the impact of pulpproperties on the production of cellulose derivatives without extensive pilot-scale trials.

Place, publisher, year, edition, pages
Umeå: Umeå Universitet, 2012. 80 p.
Keyword
cellulose ether, dissolving pulp, ethyl hydroxyethyl cellulose, hardwood, multivariate data analysis, reactivity, softwood, sulfate, sulfite, viscose
National Category
Chemical Engineering
Identifiers
urn:nbn:se:umu:diva-54008 (URN)978-91-7459-406-5 (ISBN)
Public defence
2012-05-11, Naturvetarhuset, N320, Umeå Universitet, Umeå, 10:00 (English)
Opponent
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Available from: 2012-04-20 Created: 2012-04-11 Last updated: 2012-04-20Bibliographically approved

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Strunk, PeterEliasson, Bertil

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