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undergraduate thesis
Utjecaj brzine vrtnje miješala na rast kristala boraksa u kristalizatoru s dvama aksijalnim turbinskim miješalima
završni rad
Split: University of Split, Faculty of Chemistry and Technology, 2017. urn:nbn:hr:167:841602
Crnjak, Dina
University of Split
Faculty of Chemistry and Technology
Division of Engineering and Chemistry

Institutional repository: Repository of the Faculty of chemistry and technology

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Crnjak, D. (2017). Utjecaj brzine vrtnje miješala na rast kristala boraksa u kristalizatoru s dvama aksijalnim turbinskim miješalima : završni rad (Undergraduate thesis). Split: University of Split, Faculty of Chemistry and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:167:841602

Crnjak, Dina. "Utjecaj brzine vrtnje miješala na rast kristala boraksa u kristalizatoru s dvama aksijalnim turbinskim miješalima : završni rad." Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, 2017. https://urn.nsk.hr/urn:nbn:hr:167:841602

Crnjak, Dina. "Utjecaj brzine vrtnje miješala na rast kristala boraksa u kristalizatoru s dvama aksijalnim turbinskim miješalima : završni rad." Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, 2017. https://urn.nsk.hr/urn:nbn:hr:167:841602

Crnjak, D. (2017). 'Utjecaj brzine vrtnje miješala na rast kristala boraksa u kristalizatoru s dvama aksijalnim turbinskim miješalima : završni rad', Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, accessed 25 December 2024, https://urn.nsk.hr/urn:nbn:hr:167:841602

Crnjak D. Utjecaj brzine vrtnje miješala na rast kristala boraksa u kristalizatoru s dvama aksijalnim turbinskim miješalima : završni rad [Undergraduate thesis]. Split: University of Split, Faculty of Chemistry and Technology; 2017 [cited 2024 December 25] Available at: https://urn.nsk.hr/urn:nbn:hr:167:841602

D. Crnjak, "Utjecaj brzine vrtnje miješala na rast kristala boraksa u kristalizatoru s dvama aksijalnim turbinskim miješalima : završni rad", Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, Split, 2017. Available at: https://urn.nsk.hr/urn:nbn:hr:167:841602

Metadata
TitleUtjecaj brzine vrtnje miješala na rast kristala boraksa u kristalizatoru s dvama aksijalnim turbinskim miješalima : završni rad
Title (english)Impact of impeller speed on growth of borax crystals in dual axial impeller crystallizer : bachelor thesis
AuthorDina Crnjak
MentorMarija Ćosić (mentor)
Committee memberSandra Svilović (predsjednik povjerenstva)
Committee memberIvana Smoljko (član povjerenstva)
Committee memberMarija Ćosić (član povjerenstva)
GranterUniversity of Split
Faculty of Chemistry and Technology
(Division of Engineering and Chemistry)
Split
Defense date and country2017-09-29, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Abstract
U ovom radu ispitan je utjecaj brzine vrtnje dvaju aksijalnih turbinskih miješala koja su se nalazila na zajedničkoj osovini na kinetiku rasta kristala dinatrijevog tetraborata dekahidrata (boraksa) tijekom njegove šaržne prekristalizacije postupkom kontroliranog hlađenja. Eksperimenti u radu izvodili su se u kristalizatoru ravnog dna volumena 15 dm 3 s omjerom visine stupca matične otopine i promjera kristalizatora, H/d T , od 1.3. Ovako visoka vrijednost navedenog omjera zahtijevala je da se na osovinu u reaktor u postave dva miješala. Oba korištena miješala bila su istog tipa, radilo se o miješalu s četiri ravne lopatice nagnute pod kutom od 45 ° (tzv. PBT miješalo), čiji je promjer u odnosu na promjer posude, D/d T , iznosio 0.33. U radu je detaljno ispitan utjecaj brzine vrtnje dvaju PBT miješala na promjenu prezasićenosti matične otopine, linearnu veličinu rastućih kristala te brzinu rasta kristala. Konačno, za sve primijenjene brzine vrtnje miješala procijenjeni su kinetički parametri rasta kristala. Rezultati ispitivanja ukazali su da se s povećanjem brzine vrtnje miješala prezasićenost u sustavu se smanjuje dok se linearna veličina kristala povećava. Brzine rasta kristala povećavaju se s povećanjem brzine vrtnje miješalo što s odrazilo i na povećanje konstante brzine rasta kristal. Dobiveni rezultati posljedica su pozitivnog međudjelovanja tokova dvaju miješala koja se stapaju čineći jednocirkulacijski tok. Opseg ovog toka se povećava s povećanjem brzine vrtnje što se odrazilo na poboljšanje uvjeta za rast kristala boraksa u ispitivanom sustavu.
Abstract (english)
In this work the influence of speed of two axial impellers mounted on the same shaft on crystal growth of borax decahydrate during process of batch cooling crystallization were analysed. Experiments have been performed in a flat bottom, 15 dm 3 crystallizer whose tank diameter to liquid height ratio equalled 1.3. This aspect ratio required the use of a second impeller which was mounted on the same shaft. Stirring was conducted by using two impeller of same types, axial pitched blade turbine (PBT) with impeller to tank diameter ratio, D/d T, of 0.33.The aim was analysed the influence on impeller speeds on the changes of absolute supersaturation, linear crystal size and crystal growth rates as well. Eventually, the values of the kinetics parameters of crystal growth of for all impeller speed applied were estimated. The experimental results showed that during the process time absolute supersaturation of the mother liquor decreases while the linear crystal size increases with impeller speed increment. Crystal growth rates increases with impeller speed what reflected on the values of constant of crystal growth rate. Obtained results are the consequence of interaction of flows generated by each of impellers which merged in single loop flow. The size of this loop increases as impeller speed increases what improved conditions for crystal growth in system analysed.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:167:841602
ProjectNumber: 8959
Title: Utjecaj procesnih parametara na kinetiku heterogenih sustava koji se odvijaju u šaržnom reaktoru s miješanjem
Acronym: HETMIX
Leader: Nenad Kuzmanić
Jurisdiction: Croatia
Funder: HRZZ
Study programmeTitle: Chemical Technology; specializations in: Chemical Engineering, Environmental Protection
Course: Chemical Engineering
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka kemijskog inženjerstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Public noteKljučne riječi doradio knjižničar/ Key words are revised by the librarian
Created on2018-04-05 12:30:32