prikaz prve stranice dokumenta Primjena turbidimetrije za određivanje početka nukleacije u procesu šaržne kristalizacije
  Download
PDF 1.99 MB
undergraduate thesis
Primjena turbidimetrije za određivanje početka nukleacije u procesu šaržne kristalizacije
završni rad
2018. urn:nbn:hr:167:648831
Vlahović, Zrinka
University of Split
Faculty of Chemistry and Technology
Division of Engineering and Chemistry

Cite this document

Vlahović, Z. (2018). Determination of nucleation onset by turbidimetry in process of batch cooling crystallization of borax : bachelor thesis (Undergraduate thesis). Split: University of Split, Faculty of Chemistry and Technology. Retrieved from https://urn.nsk.hr/urn:nbn:hr:167:648831

Vlahović, Zrinka. "Determination of nucleation onset by turbidimetry in process of batch cooling crystallization of borax : bachelor thesis." Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, 2018. https://urn.nsk.hr/urn:nbn:hr:167:648831

Vlahović, Zrinka. "Determination of nucleation onset by turbidimetry in process of batch cooling crystallization of borax : bachelor thesis." Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, 2018. https://urn.nsk.hr/urn:nbn:hr:167:648831

Vlahović, Z. (2018). 'Determination of nucleation onset by turbidimetry in process of batch cooling crystallization of borax : bachelor thesis', Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, accessed 27 January 2025, https://urn.nsk.hr/urn:nbn:hr:167:648831

Vlahović Z. Determination of nucleation onset by turbidimetry in process of batch cooling crystallization of borax : bachelor thesis [Undergraduate thesis]. Split: University of Split, Faculty of Chemistry and Technology; 2018 [cited 2025 January 27] Available at: https://urn.nsk.hr/urn:nbn:hr:167:648831

Z. Vlahović, "Determination of nucleation onset by turbidimetry in process of batch cooling crystallization of borax : bachelor thesis", Undergraduate thesis, University of Split, Faculty of Chemistry and Technology, Split, 2018. Available at: https://urn.nsk.hr/urn:nbn:hr:167:648831

Please login to the repository to save this object to your list.
Metadata
Title (english)Determination of nucleation onset by turbidimetry in process of batch cooling crystallization of borax : bachelor thesis
TitlePrimjena turbidimetrije za određivanje početka nukleacije u procesu šaržne kristalizacije : završni rad
AuthorZrinka Vlahović
MentorNenad Kuzmanić (mentor)
MBZ: 120556
Committee memberMiroslav Labor (predsjednik povjerenstva)
Committee memberMarija Ćosić (član povjerenstva)
Committee memberNenad Kuzmanić (član povjerenstva)
GranterUniversity of Split
Faculty of Chemistry and Technology
(Division of Engineering and Chemistry)
Split
Defense date and country2018-09-27, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Chemical Engineering
Abstract
U radu je ispitana mogućnost primjene turbidimetrijske metode za određivanje početka nukleacije u procesu šaržne kristalizacije boraksa koja se provodi postupkom kontroliranog hlađenja. Nukleacija uzrokuje promjenu fizikalnih karakteristika sustava, između ostalog i zamućenje matične otopine. Upravo pojava zamućenja upućuje na mogućnost primjene turbidimetrijske metode za određivanje početka nukleacije tj. maksimalnog stupnja prezasićenosti sustava. Početak nukleacije u ispitivanom sustavu određen je i potenciometrijskom metodom. Ispitivanja su se provodila u kristalizatoru laboratorijskog mjerila volumena 2.14 dm 3 u kojem se matična otopina miješala uporabom turbinskog miješala s četiri ravne lopatice nagnute pod kutom od 45° (tzv. 4-PTD miješala). Pri svim mjerenjima brzina hlađenja zasićene otopine iznosila je b = 6 o C/h, dok je korišteno turbinsko miješalo imalo brzinu vrtnje od N = 300 o./min. Kako bi se dobio uvid o osjetljivosti primijenjenih metoda, ispitivanja su se provodila u otopinama boraksa zasićenima na različitim temperaturama, ali koje su bile hlađene istom brzinom od 6 °C/h. Početak nukleacije u sustavu je određivan i potenciometrijskom metodom. Rezultati usporedbe izvršenih mjerenja ukazali su na vrlo visoku osjetljivost turbidimetrijske metode pri određivanju ovog kristalizacijskog parametra koji određuje kinetiku cjelokupnog procesa.
Abstract (english)
The purpose of this research was to examine the applicability of turbidimetric method for determination of nucleation in the process of batch cooling crystallization of borax. Nucleation causes the changes of physical properties of the system, among the others, changes in mother liquor clarity. In fact, this phenomenon potentially enables the application of a turbidimetric method for detection the nucleation commencement within the system. i.e. the maximum degree of system supersaturation. The onset of nucleation in the examined system is determined by the potentiometric method as well. All experiments were carried out in the stirred batch cooling crystallizer with the volume of 2.14 dm 3 . The mother liquor was stirred by axial four bladed pitched blade turbine (4-PBT). In all experiments saturated solutions were cooled down at constant rate of 6 °C/h while the impeller speed was 300 rpm. In order to obtain insigt into the sensitivity of the applied methods, the examination were carried out in borax solutions saturated at different temperatures and cooled at the same rate of 6 °C/h. By compering the results of the mesurments , the high sensitivity of the urbidimetric method is confirmed in determination of metastable zone width, which is parameter that affects kinectics of overall crystallization process.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:167:648831
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
Embargo expiration date: 2020-09-27
Terms of useLicence In copyright icon
Public noteKljučne riječi doradio knjižničar/ Key words are revised by the librarian
Created on2018-11-26 11:16:32