ΜΕΛΕΤΗ ΤΗΣ ΠΑΡΑΓΩΓΗΣ ΧΑΡΤΟΜΑΖΑΣ ΜΕ ΧΛΩΡΙΩΣΗ ΠΡΟΥΔΡΟΛΥΜΕΝΟΥ ΑΧΥΡΟΥ: ΠΡΟΒΛΗΜΑΤΑ ΕΦΑΡΜΟΓΗΣ
type: CreativeWork
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.
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.
author: Σιμωνέτης, Σπυρίδων
language: gre
keywords: 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
date published: 1990
date modified: 2026-07-24T02:24:59Z
provider: Greek National Archive of PhD Theses
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

PropertyValue
property ID: DOI
value: 10.12681/eadd/1518

PropertyValue
property ID: Handle
value: http://hdl.handle.net/10442/hedi/1518