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[{"key": "dc.contributor.author", "value": "Tuulos-Tikka, Salla", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2008-01-08T08:07:23Z", "language": "", "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2008-01-08T08:07:23Z", "language": "", "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2002", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/8962", "language": "", "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Puun alkalisessa kuidutuksessa hiilihydraatit, p\u00e4\u00e4asiassa hemiselluloosat, p\u00e4\u00e4tepilkkoutuvat\r\nns. peeling-reaktion mukaisesti, jolloin reaktiotuotteina syntyy ensisijaisesti\r\nalifaattisia karboksyylihappoja. Kyseinen reaktio aiheuttaa huomattavia saantotappioita ja\r\nheikent\u00e4\u00e4 tuotettavan massan laatua. Hiilihydraattiketjun peeling-reaktio voidaan est\u00e4\u00e4\r\nmuuntamalla ketjun pelkist\u00e4v\u00e4 p\u00e4\u00e4teryhm\u00e4 kemiallisesti esimerkiksi hapettamalla.\r\nT\u00e4ss\u00e4 tutkimuksessa hiilihydraattien pelkist\u00e4v\u00e4n p\u00e4\u00e4teryhm\u00e4n hapettaminen tehtiin\r\nhapella, jonka imeytymist\u00e4 alkaliseen esik\u00e4sittelyliuokseen tehostettiin etanolilis\u00e4yksen\r\navulla. Vertailun vuoksi esik\u00e4sittelyj\u00e4 tehtiin my\u00f6s pelk\u00e4ll\u00e4 natriumhydroksidill\u00e4 typpiilmakeh\u00e4ss\u00e4.\r\nEnsimm\u00e4isess\u00e4 vaiheessa tutkittiin malliainein puun hiilihydraattien ja uuteaineiden\r\nreagointia. Toisessa vaiheessa esik\u00e4sittelyj\u00e4 tehtiin havu- ja koivuhakkeille sek\u00e4\r\ntutkittiin esik\u00e4siteltyjen hakkeiden keittymist\u00e4 ja muodostuvan massan laatua laboratoriomittakaavaisessa\r\nsulfaattikeitossa.\r\nHiilihydraattikokeiden avulla todettiin hapettavan esik\u00e4sittelyn peeling-reaktiota ehk\u00e4isev\u00e4\r\nvaikutus. Uuteainekokeiden mukaan hapettava esik\u00e4sittely liuottaa merkitt\u00e4v\u00e4sti\r\nprosessissa haitallisia uuteainekomponentteja. Molemmat tulokset vahvistettiin hakekokeiden\r\navulla. Esik\u00e4sitellyt hakkeet keittyiv\u00e4t samoissa olosuhteissa nopeammin ja\r\nalhaisempaa kappalukuun kuin vertailuhakkeet. Viskositeetti oli alempi kuin vertailuhakkeilla,\r\nmutta esik\u00e4siteltyjen hakkeiden saannot olivat samaan H-tekij\u00e4\u00e4n keitett\u00e4ess\u00e4\r\njopa hieman suurempia kuin vertailun\u00e4ytteill\u00e4. Tutkittu happi-etanoli-natriumhydroksidiesik\u00e4sittely\r\nn\u00e4ytt\u00e4isi soveltuvan erityisesti lehtipuille normaalin sulfaattikeiton\r\nesik\u00e4sittelymenetelm\u00e4ksi.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2008-01-08T08:07:23Z (GMT). No. of bitstreams: 1\r\nG0000055.pdf: 1607972 bytes, checksum: 72f9278053cabe60750504598050b35d (MD5)\r\n Previous issue date: 2002", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (101 sivua)", "language": null, "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": null, "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "alkalistabilisuus", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "hapettava esik\u00e4sittely", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "sulfaattikeitto", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Puumateriaalin kemiallinen k\u00e4ytt\u00e4ytyminen sulfaattikeiton alkalisessa etanoliesik\u00e4sittelyss\u00e4", "language": null, "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "licentiate thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-2002887124", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.dcmitype", "value": "Text", "language": "en", "element": "type", "qualifier": "dcmitype", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Licentiate thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Lisensiaatinty\u00f6", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Kemian laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Chemistry", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Soveltava kemia", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Applied Chemistry", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_46ec", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "book", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4036", "language": null, "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "sellu", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "massanvalmistus", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "esik\u00e4sittely", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "hapetus", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "hiilihydraatit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "sulfaatit", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "selluloosa", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": 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