{"id":{"repo_id":"greece","oai_identifier":"oai:10442/1518"},"canonical_url":"https://search.dev.ndltd.org/etd/greece/oai:10442/1518","repository":{"repo_id":"greece","name":"Greek National Archive of PhD Theses","base_url":"https://phdtheses.ekt.gr/eadd_oai/request"},"display":{"title":"ΜΕΛΕΤΗ ΤΗΣ ΠΑΡΑΓΩΓΗΣ ΧΑΡΤΟΜΑΖΑΣ ΜΕ ΧΛΩΡΙΩΣΗ ΠΡΟΥΔΡΟΛΥΜΕΝΟΥ ΑΧΥΡΟΥ: ΠΡΟΒΛΗΜΑΤΑ ΕΦΑΡΜΟΓΗΣ","abstract":"THE PURPOSE OF THIS INVESTIGATION IS THE STUDY OF A NEW TECHNOLOGY FOR THE PRODUCTION OF PAPER PULP. THE METHOD CHOSEN IS THE COMBINATION OF ACID PREHYDROLYSIS, GAS CHLORINATION AND ALKALINE EXTRACTION. AN ORIGINAL LABORATORY-SCALED, CONTINUOUS- FLOW CHLORINATION REACTOR WAS DESIGNED AND CONSTRUCTED, AND THE MOVEMENT OF THE SOLIDS INSIDE IT WAS STUDIED. NEXT, THE MORPHOLOGICAL AND CHEMICAL ALTERATION IN THE MATERIAL BECAUSE OF THE PRETREATMENTS USED (GRINDING, SCREENINGOF THE RAW MATERIAL) WAS INVESTIGATED. THEN, A HETEROGENEOUS KINETIC MODEL FORTHE STRAW CHLORINATION WAS DEVELOPED AND IT WAS DETERMINED THAT THE RATE CONTROLLING STEP APPEARS TO BE INTERNAL DIFFUSION THROUGH THE REACTED STRAW LAYER, WITH A DIFFUSION COEFFICIENT WHICH DECREASES WITH INCREASING LAYER THICKNESS AND, ALSO, WITH DECREASING STRAW PARTICLE AVERAGE SIZE. FINALLY, THE PULP MECHANICAL STRENGHTS AND BRIGHTNESS WERE DETERMINED AND THE EFFECT OF THE MAIN TREATMENT PARAMETERS ON THE PULP PROPERTIES WAS EXAMINED.","abstract_html":"THE PURPOSE OF THIS INVESTIGATION IS THE STUDY OF A NEW TECHNOLOGY FOR THE PRODUCTION OF PAPER PULP. THE METHOD CHOSEN IS THE COMBINATION OF ACID PREHYDROLYSIS, GAS CHLORINATION AND ALKALINE EXTRACTION. AN ORIGINAL LABORATORY-SCALED, CONTINUOUS- FLOW CHLORINATION REACTOR WAS DESIGNED AND CONSTRUCTED, AND THE MOVEMENT OF THE SOLIDS INSIDE IT WAS STUDIED. NEXT, THE MORPHOLOGICAL AND CHEMICAL ALTERATION IN THE MATERIAL BECAUSE OF THE PRETREATMENTS USED (GRINDING, SCREENINGOF THE RAW MATERIAL) WAS INVESTIGATED. THEN, A HETEROGENEOUS KINETIC MODEL FORTHE STRAW CHLORINATION WAS DEVELOPED AND IT WAS DETERMINED THAT THE RATE CONTROLLING STEP APPEARS TO BE INTERNAL DIFFUSION THROUGH THE REACTED STRAW LAYER, WITH A DIFFUSION COEFFICIENT WHICH DECREASES WITH INCREASING LAYER THICKNESS AND, ALSO, WITH DECREASING STRAW PARTICLE AVERAGE SIZE. FINALLY, THE PULP MECHANICAL STRENGHTS AND BRIGHTNESS WERE DETERMINED AND THE EFFECT OF THE MAIN TREATMENT PARAMETERS ON THE PULP PROPERTIES WAS EXAMINED.","abstract_has_math":false,"creators":["Σιμωνέτης, Σπυρίδων"],"institution":"Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1990,"date_issued":"1990","date_published":"1990","updated_at":"2026-07-24T02:24:59Z","subjects":["Chlorination","Kinetics","MECHANICAL STRENGTHS","MECHANICALPRETREATMENTS","Paper","PREHYDROLYSIS","PULP","STRAW","ΑΧΥΡΟ","Κινητική","ΜΗΧΑΝΙΚΕΣ ΑΝΤΟΧΕΣ","ΜΗΧΑΝΙΚΕΣ ΠΡΟΚΑΤΕΡΓΑΣΙΕΣ","ΠΡΟΥΔΡΟΛΥΣΗ","Χαρτί","ΧΑΡΤΟΜΑΖΑ","Χλωρίωση","Engineering and Technology","Chemical Engineering","Επιστήμες Μηχανικού και Τεχνολογία","Επιστήμη Χημικού Μηχανικού"],"languages":["gre"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["10.12681/eadd/1518"],"render_values":[{"text":"10.12681/eadd/1518","href":"https://doi.org/10.12681/eadd/1518","code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/10442/hedi/1518","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Σιμωνέτης, Σπυρίδων"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["1990"]},{"key":"dc:publisher","label":"Institution","values":["Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)","National Technical University of Athens (NTUA)"]},{"key":"dc:type","label":"Dc Type","values":["PhD Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Chlorination","Kinetics","MECHANICAL STRENGTHS","MECHANICALPRETREATMENTS","Paper","PREHYDROLYSIS","PULP","STRAW","ΑΧΥΡΟ","Κινητική","ΜΗΧΑΝΙΚΕΣ ΑΝΤΟΧΕΣ","ΜΗΧΑΝΙΚΕΣ ΠΡΟΚΑΤΕΡΓΑΣΙΕΣ","ΠΡΟΥΔΡΟΛΥΣΗ","Χαρτί","ΧΑΡΤΟΜΑΖΑ","Χλωρίωση","Engineering and Technology","Chemical Engineering","Επιστήμες Μηχανικού και Τεχνολογία","Επιστήμη Χημικού Μηχανικού"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["gre"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["10.12681/eadd/1518","http://hdl.handle.net/10442/hedi/1518"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["THE PURPOSE OF THIS INVESTIGATION IS THE STUDY OF A NEW TECHNOLOGY FOR THE PRODUCTION OF PAPER PULP. THE METHOD CHOSEN IS THE COMBINATION OF ACID PREHYDROLYSIS, GAS CHLORINATION AND ALKALINE EXTRACTION. AN ORIGINAL LABORATORY-SCALED, CONTINUOUS- FLOW CHLORINATION REACTOR WAS DESIGNED AND CONSTRUCTED, AND THE MOVEMENT OF THE SOLIDS INSIDE IT WAS STUDIED. NEXT, THE MORPHOLOGICAL AND CHEMICAL ALTERATION IN THE MATERIAL BECAUSE OF THE PRETREATMENTS USED (GRINDING, SCREENINGOF THE RAW MATERIAL) WAS INVESTIGATED. THEN, A HETEROGENEOUS KINETIC MODEL FORTHE STRAW CHLORINATION WAS DEVELOPED AND IT WAS DETERMINED THAT THE RATE CONTROLLING STEP APPEARS TO BE INTERNAL DIFFUSION THROUGH THE REACTED STRAW LAYER, WITH A DIFFUSION COEFFICIENT WHICH DECREASES WITH INCREASING LAYER THICKNESS AND, ALSO, WITH DECREASING STRAW PARTICLE AVERAGE SIZE. FINALLY, THE PULP MECHANICAL STRENGHTS AND BRIGHTNESS WERE DETERMINED AND THE EFFECT OF THE MAIN TREATMENT PARAMETERS ON THE PULP PROPERTIES WAS EXAMINED.","ΣΤΗΝ ΕΡΓΑΣΙΑ ΑΥΤΗ ΕΞΕΤΑΖΕΤΑΙ Η ΔΥΝΑΤΟΤΗΤΑ ΔΙΑΜΟΡΦΩΣΗΣ ΜΙΑΣ ΝΕΑΣ ΤΕΧΝΟΛΟΓΙΑΣ ΣΤΗΝ ΠΑΡΑΓΩΓΗ ΤΟΥ ΧΑΡΤΙΟΥ ΑΠΟ ΑΧΥΡΟ. Η ΜΕΘΟΔΟΣ ΠΟΥ ΧΡΗΣΙΜΟΠΟΙΕΙΤΑΙ ΕΙΝΑΙ Ο ΣΥΝΔΥΑΣΜΟΣ ΟΞΙΝΗΣ ΠΡΟΥΔΡΟΛΥΣΗΣ, ΑΕΡΙΑΣ ΧΛΩΡΙΩΣΗΣ ΚΑΙ ΑΛΚΑΛΙΚΗΣ ΕΚΧΥΛΙΣΗΣ. ΣΧΕΔΙΑΣΤΗΚΕ ΚΑΙ ΚΑΤΑΣΚΕΥΑΣΤΗΚΕ ΕΝΑΣ ΠΡΩΤΟΤΥΠΟΣ ΕΡΓΑΣΤΗΡΙΑΚΟΣ ΑΝΤΙΔΡΑΣΤΗΡΑΣ ΧΛΩΡΙΩΣΗΣ ΣΥΝΕΧΟΥΣ ΕΡΓΟΥ ΚΑΙ ΕΞΕΤΑΣΘΗΚΕ Η ΔΙΑΚΙΝΗΣΗ ΤΩΝ ΣΤΕΡΕΩΝ ΣΤΟ ΕΣΩΤΕΡΙΚΟ ΤΟΥ. ΕΠΙΣΗΣ, ΜΕΛΕΤΗΘΗΚΕ Η ΜΟΡΦΟΛΟΓΙΚΗ ΚΑΙ ΧΗΜΙΚΗ ΤΡΟΠΟΠΟΙΗΣΗ ΤΟΥ ΥΛΙΚΟΥ ΕΞΑΙΤΙΑΣ ΤΗΣ ΕΠΙΔΡΑΣΗΣ ΤΩΝ ΠΡΟΚΑΤΕΡΓΑΣΙΩΝ (ΚΟΙΤΗ, ΚΟΣΚΙΝΙΣΗ ΤΗΣ ΠΡΩΤΗΣ ΥΛΗΣ). ΑΚΟΛΟΥΘΩΣ ΑΝΑΠΤΥΧΘΗΚΕ ΕΝΑΜΟΝΤΕΛΟ ΕΤΕΡΟΓΕΝΟΥΣ ΚΙΝΗΤΙΚΗΣ ΤΗΣ ΧΛΩΡΙΩΣΗΣ ΚΑΙ ΠΡΟΣΔΙΟΡΙΣΤΗΚΕ ΠΩΣ ΕΛΕΓΧΟΝ ΣΤΑΔΙΟ ΤΗΣ ΔΡΑΣΗΣ ΕΙΝΑΙ Η ΔΙΑΧΥΣΗ ΤΟΥ ΧΛΩΡΙΟΥ ΜΕΣΑ ΑΠΟ ΤΟ ΣΤΡΩΜΑ ΤΟΥ ΑΧΥΡΟΥ ΠΟΥ ΕΧΕΙ ΗΔΗ ΑΝΤΙΔΡΑΣΕΙ ΜΕ ΤΟ ΧΛΩΡΙΟ, ΕΝΩ Ο ΣΥΝΤΕΛΕΣΤΗΣ ΔΙΑΧΥΣΗΣ ΜΕΙΩΝΕΤΑΙ ΜΕ ΤΗΝ ΑΥΞΗΣΗ ΤΟΥ ΠΑΧΟΥΣ ΑΥΤΟΥ ΤΟΥ ΣΤΡΩΜΑΤΟΣ ΚΑΙ, ΕΠΙΣΗΣ, ΜΕ ΤΗ ΜΕΙΩΣΗ ΤΟΥ ΜΕΓΕΘΟΥΣ ΤΩΝ ΤΕΜΑΧΙΔΙΩΝ ΤΟΥ ΑΧΥΡΟΥ. ΤΕΛΟΣ, ΜΕΤΡΗΘΗΚΑΝ ΟΙ ΜΗΧΑΝΙΚΕΣ ΑΝΤΟΧΕΣ ΚΑΙ Η ΛΕΥΚΟΤΗΤΑ ΤΟΥ ΠΟΛΤΟΥ ΠΟΥ ΠΑΡΑΣΚΕΥΑΖΕΤΑΙ ΜΕ ΤΗΝ ΠΑΡΑΠΑΝΩ ΔΙΑΔΙΚΑΣΙΑ, ΚΑΙ ΕΞΕΤΑΣΘΗΚΕ Η ΕΠΙΔΡΑΣΗ ΤΩΝ ΚΥΡΙΩΝ ΠΑΡΑΜΕΤΡΩΝ ΤΩΝ ΧΗΜΙΚΩΝ ΚΑΤΕΡΓΑΣΙΩΝ ΣΕ ΑΥΤΕΣ."]},{"key":"dc:title","label":"Title","values":["ΜΕΛΕΤΗ ΤΗΣ ΠΑΡΑΓΩΓΗΣ ΧΑΡΤΟΜΑΖΑΣ ΜΕ ΧΛΩΡΙΩΣΗ ΠΡΟΥΔΡΟΛΥΜΕΝΟΥ ΑΧΥΡΟΥ: ΠΡΟΒΛΗΜΑΤΑ ΕΦΑΡΜΟΓΗΣ","AN INVESTIGATION OF THE PRODUCTION OF PAPER PULP BY THE USE OF CHLORINATION OF PREHYDROLYZED STRAW: APPLICATION PROBLEMS"]}]}],"canonical_facts":{"dc:creator":["Σιμωνέτης, Σπυρίδων"],"dc:date":["1990"],"dc:description":["THE PURPOSE OF THIS INVESTIGATION IS THE STUDY OF A NEW TECHNOLOGY FOR THE PRODUCTION OF PAPER PULP. THE METHOD CHOSEN IS THE COMBINATION OF ACID PREHYDROLYSIS, GAS CHLORINATION AND ALKALINE EXTRACTION. AN ORIGINAL LABORATORY-SCALED, CONTINUOUS- FLOW CHLORINATION REACTOR WAS DESIGNED AND CONSTRUCTED, AND THE MOVEMENT OF THE SOLIDS INSIDE IT WAS STUDIED. NEXT, THE MORPHOLOGICAL AND CHEMICAL ALTERATION IN THE MATERIAL BECAUSE OF THE PRETREATMENTS USED (GRINDING, SCREENINGOF THE RAW MATERIAL) WAS INVESTIGATED. THEN, A HETEROGENEOUS KINETIC MODEL FORTHE STRAW CHLORINATION WAS DEVELOPED AND IT WAS DETERMINED THAT THE RATE CONTROLLING STEP APPEARS TO BE INTERNAL DIFFUSION THROUGH THE REACTED STRAW LAYER, WITH A DIFFUSION COEFFICIENT WHICH DECREASES WITH INCREASING LAYER THICKNESS AND, ALSO, WITH DECREASING STRAW PARTICLE AVERAGE SIZE. FINALLY, THE PULP MECHANICAL STRENGHTS AND BRIGHTNESS WERE DETERMINED AND THE EFFECT OF THE MAIN TREATMENT PARAMETERS ON THE PULP PROPERTIES WAS EXAMINED.","ΣΤΗΝ ΕΡΓΑΣΙΑ ΑΥΤΗ ΕΞΕΤΑΖΕΤΑΙ Η ΔΥΝΑΤΟΤΗΤΑ ΔΙΑΜΟΡΦΩΣΗΣ ΜΙΑΣ ΝΕΑΣ ΤΕΧΝΟΛΟΓΙΑΣ ΣΤΗΝ ΠΑΡΑΓΩΓΗ ΤΟΥ ΧΑΡΤΙΟΥ ΑΠΟ ΑΧΥΡΟ. Η ΜΕΘΟΔΟΣ ΠΟΥ ΧΡΗΣΙΜΟΠΟΙΕΙΤΑΙ ΕΙΝΑΙ Ο ΣΥΝΔΥΑΣΜΟΣ ΟΞΙΝΗΣ ΠΡΟΥΔΡΟΛΥΣΗΣ, ΑΕΡΙΑΣ ΧΛΩΡΙΩΣΗΣ ΚΑΙ ΑΛΚΑΛΙΚΗΣ ΕΚΧΥΛΙΣΗΣ. ΣΧΕΔΙΑΣΤΗΚΕ ΚΑΙ ΚΑΤΑΣΚΕΥΑΣΤΗΚΕ ΕΝΑΣ ΠΡΩΤΟΤΥΠΟΣ ΕΡΓΑΣΤΗΡΙΑΚΟΣ ΑΝΤΙΔΡΑΣΤΗΡΑΣ ΧΛΩΡΙΩΣΗΣ ΣΥΝΕΧΟΥΣ ΕΡΓΟΥ ΚΑΙ ΕΞΕΤΑΣΘΗΚΕ Η ΔΙΑΚΙΝΗΣΗ ΤΩΝ ΣΤΕΡΕΩΝ ΣΤΟ ΕΣΩΤΕΡΙΚΟ ΤΟΥ. ΕΠΙΣΗΣ, ΜΕΛΕΤΗΘΗΚΕ Η ΜΟΡΦΟΛΟΓΙΚΗ ΚΑΙ ΧΗΜΙΚΗ ΤΡΟΠΟΠΟΙΗΣΗ ΤΟΥ ΥΛΙΚΟΥ ΕΞΑΙΤΙΑΣ ΤΗΣ ΕΠΙΔΡΑΣΗΣ ΤΩΝ ΠΡΟΚΑΤΕΡΓΑΣΙΩΝ (ΚΟΙΤΗ, ΚΟΣΚΙΝΙΣΗ ΤΗΣ ΠΡΩΤΗΣ ΥΛΗΣ). ΑΚΟΛΟΥΘΩΣ ΑΝΑΠΤΥΧΘΗΚΕ ΕΝΑΜΟΝΤΕΛΟ ΕΤΕΡΟΓΕΝΟΥΣ ΚΙΝΗΤΙΚΗΣ ΤΗΣ ΧΛΩΡΙΩΣΗΣ ΚΑΙ ΠΡΟΣΔΙΟΡΙΣΤΗΚΕ ΠΩΣ ΕΛΕΓΧΟΝ ΣΤΑΔΙΟ ΤΗΣ ΔΡΑΣΗΣ ΕΙΝΑΙ Η ΔΙΑΧΥΣΗ ΤΟΥ ΧΛΩΡΙΟΥ ΜΕΣΑ ΑΠΟ ΤΟ ΣΤΡΩΜΑ ΤΟΥ ΑΧΥΡΟΥ ΠΟΥ ΕΧΕΙ ΗΔΗ ΑΝΤΙΔΡΑΣΕΙ ΜΕ ΤΟ ΧΛΩΡΙΟ, ΕΝΩ Ο ΣΥΝΤΕΛΕΣΤΗΣ ΔΙΑΧΥΣΗΣ ΜΕΙΩΝΕΤΑΙ ΜΕ ΤΗΝ ΑΥΞΗΣΗ ΤΟΥ ΠΑΧΟΥΣ ΑΥΤΟΥ ΤΟΥ ΣΤΡΩΜΑΤΟΣ ΚΑΙ, ΕΠΙΣΗΣ, ΜΕ ΤΗ ΜΕΙΩΣΗ ΤΟΥ ΜΕΓΕΘΟΥΣ ΤΩΝ ΤΕΜΑΧΙΔΙΩΝ ΤΟΥ ΑΧΥΡΟΥ. ΤΕΛΟΣ, ΜΕΤΡΗΘΗΚΑΝ ΟΙ ΜΗΧΑΝΙΚΕΣ ΑΝΤΟΧΕΣ ΚΑΙ Η ΛΕΥΚΟΤΗΤΑ ΤΟΥ ΠΟΛΤΟΥ ΠΟΥ ΠΑΡΑΣΚΕΥΑΖΕΤΑΙ ΜΕ ΤΗΝ ΠΑΡΑΠΑΝΩ ΔΙΑΔΙΚΑΣΙΑ, ΚΑΙ ΕΞΕΤΑΣΘΗΚΕ Η ΕΠΙΔΡΑΣΗ ΤΩΝ ΚΥΡΙΩΝ ΠΑΡΑΜΕΤΡΩΝ ΤΩΝ ΧΗΜΙΚΩΝ ΚΑΤΕΡΓΑΣΙΩΝ ΣΕ ΑΥΤΕΣ."],"dc:identifier":["10.12681/eadd/1518","http://hdl.handle.net/10442/hedi/1518"],"dc:language":["gre"],"dc:publisher":["Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)","National Technical University of Athens (NTUA)"],"dc:subject":["Chlorination","Kinetics","MECHANICAL STRENGTHS","MECHANICALPRETREATMENTS","Paper","PREHYDROLYSIS","PULP","STRAW","ΑΧΥΡΟ","Κινητική","ΜΗΧΑΝΙΚΕΣ ΑΝΤΟΧΕΣ","ΜΗΧΑΝΙΚΕΣ ΠΡΟΚΑΤΕΡΓΑΣΙΕΣ","ΠΡΟΥΔΡΟΛΥΣΗ","Χαρτί","ΧΑΡΤΟΜΑΖΑ","Χλωρίωση","Engineering and Technology","Chemical Engineering","Επιστήμες Μηχανικού και Τεχνολογία","Επιστήμη Χημικού Μηχανικού"],"dc:title":["ΜΕΛΕΤΗ ΤΗΣ ΠΑΡΑΓΩΓΗΣ ΧΑΡΤΟΜΑΖΑΣ ΜΕ ΧΛΩΡΙΩΣΗ ΠΡΟΥΔΡΟΛΥΜΕΝΟΥ ΑΧΥΡΟΥ: ΠΡΟΒΛΗΜΑΤΑ ΕΦΑΡΜΟΓΗΣ","AN INVESTIGATION OF THE PRODUCTION OF PAPER PULP BY THE USE OF CHLORINATION OF PREHYDROLYZED STRAW: APPLICATION PROBLEMS"],"dc:type":["PhD Thesis"]},"updated_at":"2026-07-24T02:24:59Z"}