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Separation of non-sucrosecompounds from the inermediate products of sugar crystallization using ultrafiltration

dc.contributor.advisorGyura, Julianna
dc.contributor.otherGyura, Julianna
dc.contributor.otherTekić, Miodrag
dc.contributor.otherVatai, Gyula
dc.creatorŠereš, Zita
dc.date.accessioned2018-12-19T17:10:45Z
dc.date.available2018-12-19T17:10:45Z
dc.date.available2020-07-03T13:53:05Z
dc.date.issued2008-02-22
dc.identifier.urihttps://www.cris.uns.ac.rs/DownloadFileServlet/Disertacija152474308718313.pdf?controlNumber=(BISIS)71292&fileName=152474308718313.pdf&id=11274&source=NaRDuS&language=srsr
dc.identifier.urihttps://nardus.mpn.gov.rs/handle/123456789/10382
dc.identifier.urihttps://www.cris.uns.ac.rs/record.jsf?recordId=71292&source=NaRDuS&language=srsr
dc.identifier.urihttps://www.cris.uns.ac.rs/DownloadFileServlet/IzvestajKomisije153898293129181.pdf?controlNumber=(BISIS)71292&fileName=153898293129181.pdf&id=12092&source=NaRDuS&language=srsr
dc.description.abstractU radu su ispitane mogucnosti separacaije nesaharoznih jedinjenja ultrafiltracijom iz rastvora B i C šecera sadržaja suve materije 60 i 30 oBx. Eksperimentalna ispitivanja su izvedena na keramickim membrana sa otvorom pora od 20 i 5 nm, bez i sa primenom statickog mešaca kao promotora turbulencije. Tokom recirkulacije i koncentrovanja napojne smeše pracen je uticaj nezavisno promenljivih (transmembranskog pritiska, protoka, temperature i vremena trajanja procesa) na fluks, boju, mutnocu i kvocijent cistoce permeta. Ispitan je uticaj statickog mešaca na prljanje membrane, na potrošnju energije i smanjenja proizvodnih troškova. Eksperimentalni rezultati su jasno pokazali da se najveca razlika u vrednosti fluksa permeata rastvora B šecera dobija kada se uporedi nacin rada bez i sa upotrebom mešaca. Ta razlika iznosi 30% na 80oC, odn. 65% kada se temperatura održava na 70oC. Pri ultrafiltraciji rastvora C šecera, koji sadrži mnogostruko vecu kolicinu nesaharoznih jedinjenja, registruje se brža koncentraciona polarizacija, te se pri istim uslovima postiže za 70% manji fluks od fluksa permeata rastvora B šecera. Sadržaj saharoze permeata i retentata se ne menja tokom ultrafiltracije, nema merljive retencije saharoze, što je presudno za buducu primenu ovog separacionog postupka u industriju šecera. Dekoloracija rastvora B šecera bez upotrebe mešaca ?? na nivou 40%, ? postiže se na pritisku nižem od 6 bar i protoku od 250 L/h. Upotrebom mešaca se efekat dekoloracije poboljšava za oko 60%, i to pri protoku ispod 200 L/h. Izdvajanje bojenih materija pri ultrafiltraciji rastvora C šecera je prividno manje efikasno, jer ne prelazi vrednost od 25% racunato na napojnu smešu, mada se u apsolutnim vrednostima iz rastvora B i C šecera izdvoji približno ista kolicina bojenih materija (900 IJ). Ultrafiltracijom se mutnoca napojne smeše redukuje za 85%. Ispitivanja prljanja membrane pri ultrafiltraciji su pokazala da koncentraciona polarizacija i formiranje sloja sastavljenog od nesaharoznih jedinjenja na površini membrane predstavljaju dominantan udeo ukupnog hidraulicnog otpora. U membrani sa otvorom pora 20 nm, tokom ultrafiltracije meduproizvoda f?ze kristalizacije, otpor poraste usled prljanja za 20 – 50 puta, a u membrani sa otvorom pora 5 nm za 100 – 300 puta u odnosu na otpor ciste membrane. Korišcenje mešaca je opravdano u intervalu gubitaka hidraulicke snage od 0 – 7 W, jer se time postiže povecanje fluksa i do 60%. Pri vecim gubicima hidraulicne snage, odn. pri vecim brzinama proticanja, nivo turbulencije u praznoj cevi je znacajan, tako da se i bez upotrebe mešaca registruju vece vrednosti fluksa. Povecanje stepena koncentrovanja napojne smeše sa 1,0 na 1,2 prati smanjenje ukupnih prizvodnih troškova u opsegu od 30 – 77% kada se proces ultrafiltracije realizuje uz upotrebu mešaca.sr
dc.description.abstractThis work presents the study of possibility to separate of non-sucrose compounds from B and C sugar solutions, with a dry matter content of 60 and 30 oBx by ultrafiltration. Experimental investigations were performed on ceramic tubular 20 and 5 nm pore diameters membranes, with and without kenics static mixer as turbulence promoter. The influence of independent parameters (transmembrane pressure, flow rate, temperature and ultrafiltration time duration) on permetate flux, colour, turbidity and purity during feed recirculation and feed concentration were examined. The efficiency of static mixer was investigated on membrane fouling, on energy consumption and on economical calculations. The experimental results showed that, the greatest flux difference of B sugar solution was obtained when the operation mode was with a static mixer in comparation to the operation mode without one, showing 30% difference at temperature 80 oC and 65% at 70 oC. While ultrafiltering the C sugar solution, which contains more non-sucrose compounds, a faster concentration polarization was noticed, thus at the same working conditions 70% less flux was reached in comparison with to the B sugar solution permeate flux. The permeate and retentate sugar content did not changed during ultrafiltration, there is no measurable retention of sucrose, which is important for the implementation of this type of separation into sugar industry. The decoloration of B sugar solution without static mixer is 40%, and can be reached at transmembrane pressure bellow 6 bar and flow rate of 250 L/h. By using a static mixer the decoloration effect is improved for 60%, when flow rate is held bellow 200 L/h. The separation of coloured compounds during ultrafiltration of C sugar solution is apparently less efficient since the value did not reach 25% calculated on feed, even though measured in absolute values the same level of coloured compounds was separated from B and C sugar solution (900 IU). The turbidity of B and C solution was reduced by ultrafiltration for 85%. The examinations of membrane fouling during ultrafiltration showed that the concentration polarization and formation of a non-sucrose compound layer on the membrane surface are dominant parts of the total hydraulic resistance. During ultrafiltration of intermediate products of sugar crystallization using 20 nm pore membrane diameter the resistance increased for 20 – 50 times due to fouling. Using a 5 nm pore diameter membrane the resistance increased for 100 – 300 times comparing to clean membrane. The use of static mixer is justified when 0 – 7 W loss of hydraulic power was determined, because in that interval a 60% flux increase was detected. At higher levels of hydraulic power loss, and at higher values of flow rates the turbulency in empty tubular membrane is significant, so even without using static mixers higher values of flux are detected. When a static mixer was used with the increase of volume concentration ratio from 1,0 to 1,2 the total production costs decreased in a range of 30 – 77%.en
dc.languagesr (latin script)
dc.publisherУниверзитет у Новом Саду, Технолошки факултетsr
dc.rightsopenAccessen
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.sourceУниверзитет у Новом Садуsr
dc.subjectUltrafiltrcijasr
dc.subjectUltrafiltrationen
dc.subjectstaticki mešacsr
dc.subjectB šecersr
dc.subjectC šecersr
dc.subjectnesaharozna jedinjenjasr
dc.subjectstatic mixeren
dc.subjectB sugaren
dc.subjectC sugaren
dc.subjectnonsucrosecompoundsen
dc.titleSeparacija nesaharoznih jedinjenja iz međufaznih produkata kristalizacije šećera ultrafiltracijomsr
dc.title.alternativeSeparation of non-sucrosecompounds from the inermediate products of sugar crystallization using ultrafiltrationen
dc.typedoctoralThesisen
dc.rights.licenseBY-NC-ND
dc.identifier.fulltexthttps://nardus.mpn.gov.rs/bitstream/id/39939/Disertacija.pdf
dc.identifier.fulltexthttps://nardus.mpn.gov.rs/bitstream/id/39940/IzvestajKomisije.pdf
dc.identifier.fulltexthttp://nardus.mpn.gov.rs/bitstream/id/39940/IzvestajKomisije.pdf
dc.identifier.fulltexthttp://nardus.mpn.gov.rs/bitstream/id/39939/Disertacija.pdf
dc.identifier.rcubhttps://hdl.handle.net/21.15107/rcub_nardus_10382


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