Chemické a chemicko-mechanické zpracování slámy řepky olejky

Gurung, Bijay

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dc.contributor.advisor	Potůček, František
dc.contributor.author	Gurung, Bijay
dc.date.accessioned	2016-04-25T16:09:58Z
dc.date.available	2016-04-25T16:09:58Z
dc.date.issued	2015
dc.date.submitted	2015-07-01
dc.identifier	práce dosud není ve studovně dostupná
dc.identifier.uri	http://hdl.handle.net/10195/64075
dc.description.abstract	Práce se zabývá přípravou vlákniny ze slámy řepky olejky chemickým a chemicko- -mechanickým postupem. Diskontinuální natronové várky byly uskutečněny bez přídavku a s přídavkem antrachinonu. U uvařené buničiny byl stanoven její celkový výtěžek, stupeň delignifikace a množství neprovarů. Chemicko-mechanické zpracování bylo uskutečněno studenými postupy, neutrálně sulfitovým, alkalickým sulfitový a natronovým. U připravené vlákniny byla vyhodnocena zejména její pevnost v ohybu.	cze
dc.format.extent	5735335 bytes
dc.format.mimetype	application/pdf
dc.language.iso	eng
dc.publisher	Univerzita Pardubice	cze
dc.rights	Práce není přístupná
dc.subject	sláma řepky olejky	cze
dc.subject	natronová buničina	cze
dc.subject	antrachinon	cze
dc.subject	chemicko-mechanická vláknina	cze
dc.subject	pevnostní vlastnosti	cze
dc.subject	rapeseed straw	eng
dc.subject	soda pulp	eng
dc.subject	anthraquinone	eng
dc.subject	chemi-mechanical pulp	eng
dc.subject	strength properties	eng
dc.title	Chemické a chemicko-mechanické zpracování slámy řepky olejky	cze
dc.title.alternative	Chemical and chemi-mechanical pulping of rapeseed straw	eng
dc.type	disertační práce	cze
dc.contributor.referee	Gigac, Juraj
dc.contributor.referee	Vrška, Milan
dc.date.accepted	2015-09-24
dc.description.abstract-translated	Firstly, batch soda pulping of rapeseed straw (species Brassica napus L. convar. napus) was conducted without and with addition of anthraquinone as a catalyst in the cooking liquor. To characterize the chemical composition of rapeseed straw, cellulose, holocellulose, lignin, ash, and extractives were determined. For selected samples of pulp, degree of polymerization, as well as strength properties of soda and soda-AQ pulps were measured. The presence of anthraquinone in cooking liquor accelerates delignification, however, for a given H-factor, lower kappa number and total yield were achieved, compared with cooking without anthraquinone. Also, anthraquinone in cooking liquor had a positive effect upon the decrease of rejects, mainly at a lower H-factor. Secondly, pulping of rapeseed straw using sodium sulphite, blend of sodium sulphite and caustic soda and caustic soda via cold processes were conducted. The influence of varying charges of chemicals on strength properties of handsheets were studied. Moreover, the effect of adding mechanical and chemi-mechancial pulp to secondary fibres upon strength charactersitics of handsheets were determined. The results revealed that the caustic soda pulping has greater effect on bending stiffness and bending modulus of handsheets in comparison with neutral sulphite and alkaline sulphite pulping. The addition chemi-mechanical pulp and mechanical pulp into secondary fibres reduced the bending stiffness while, 25 % of chemi-mechanical pulp addition with secondary fibres increased the bending modulus of handsheets obtained from cold pulping processes. Thirdly, the mechanical and chemi-mechanical pulp was treated with various enzymes. Among all enzymes utilized, the straw treated with BLX 13839 showed higher bending stiffness for handsheets having basis weights of about 260 g m-2 and 520 g m-2. Similarly, the bending modulus of elasticity was the highest for the pulp leached with BZM 2555 for both levels of basis weights.	eng
dc.description.department	Fakulta chemicko-technologická	cze
dc.thesis.degree-discipline	Technology of Macromolecular Compounds	cze
dc.thesis.degree-name	Ph.D.
dc.thesis.degree-grantor	Univerzita Pardubice. Fakulta chemicko-technologická	cze
dc.identifier.signature	dosud nepřidělena
dc.thesis.degree-program	Chemistry and Technology of Materials	cze
dc.identifier.stag	28680
dc.description.grade	Dokončená práce s úspěšnou obhajobou	cze