Pitch adsorption on natural and modified talcs

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dc.contributor.authorTijero Cruz, Antonio
dc.contributor.authorMonte Lara, María Concepción
dc.contributor.authorBlanco Suárez, María Ángeles
dc.contributor.authorNegro Álvarez, Carlos Manuel
dc.contributor.authorTijero Miquel, Julio Félix
dc.date.accessioned2023-06-20T11:03:29Z
dc.date.available2023-06-20T11:03:29Z
dc.date.issued2009
dc.description.abstractTalc is used traditionally for pitch control in papermaking. The effectiveness of talcs as control agent of dissolved and colloidal pitch depends on its structural and surface characteristics of minerals. Talcs are modified by thermal and surface treatments to obtain different properties e.g specific surface, surface energy, surface charge and ratio lypophilic/hydrophilic surface. Five commercial talcs have been tested to determine its capacity to adsorb the lypophilic contaminants by experiments of adsorption isotherms. The talcs correspond to two groups of different mineralogical compositions: one with high concentration of talc and some dolomite; and the other, with medium concentrations of talc and chlorite. Colloidal dispersions of extractives were obtained by extraction of Eucalyptus globulus wood at pilot plant scale with acetone, evaporation of the solvent and reextraction with hexane to increase the selectivity of lypophillic compound extraction. The isotherms of adsorption of the pitch dispersions were carried out at 50ºC on the different talcs. The adsorption took place by a mechanism of colloidal adsorption and the results obtained were adjusted to the Langmuir equation. Results show that talc addition to bleaching waters or process waters can produce high reductions of colloidal pitch concentrations, at comparatively low doses.
dc.description.departmentDepto. de Ingeniería Química y de Materiales
dc.description.facultyFac. de Ciencias Químicas
dc.description.refereedTRUE
dc.description.sponsorshipMinisterio de Ciencia e Innovación (España)
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/34431
dc.identifier.issn0826-6220
dc.identifier.officialurlhttps://imisrise.tappi.org/TAPPI/Products/11/OCT/11OCT53.aspx
dc.identifier.urihttps://hdl.handle.net/20.500.14352/51656
dc.issue.number3-4
dc.journal.titleJournal of Pulp and Paper Science
dc.language.isoeng
dc.page.final136
dc.page.initial130
dc.publisherTappi
dc.relation.hasversionAM
dc.relation.projectIDCTQ2004-04845-CO2-01
dc.rights.accessRightsopen access
dc.subject.keywordTalc
dc.subject.keywordModified talc
dc.subject.keywordPitch
dc.subject.keywordPitch control
dc.subject.keywordWood extractives
dc.subject.ucmIndustria del papel
dc.subject.ucmIngeniería química
dc.subject.unesco3312.13 Tecnología de la Madera
dc.subject.unesco3303 Ingeniería y Tecnología Químicas
dc.titlePitch adsorption on natural and modified talcs
dc.typejournal article
dc.volume.number35
dspace.entity.typePublication
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relation.isAuthorOfPublication3754a014-7035-4e52-8d68-d620b56e40be
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relation.isAuthorOfPublication73afd169-0ca2-4bdf-bf7c-6e1058d4b211
relation.isAuthorOfPublication.latestForDiscoverye966ef7f-5e77-4191-b603-2fcbadfa38d5
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