Eksperimentalno testiranje postopkov nanofiltracije poliamidamin-epiklorohidrinskih smol

Zwitter, Matej (author), Golobič, Iztok (mentor)

V nalogi obravnavamo diafiltracijo raztopine PAE smole z namenom zmanjšanja vsebnosti stranskih produktov DCP in MCPD. Uporabljeni sta nanofiltracijski membrani Koch SR3D in Koch SelRO MPS-34, obe s parametrom MWCO 200 daltonov. Spremljamo kratkoročno in dolgoročno spreminjanje permeabilnosti membran in stopnjo zadrževanja DCP in MCPD. Filtracija je izvajana pri nevtralnem pH. Rezultati kažejo, da skladno s pričakovanji PAE smola membran ne prehaja. V nasprotju s pričakovanji DCP in MCPD skozi membrano ne prehajata neovirano. Rezultati kažejo tudi, da se membrana tekom delovanja ne maši, maši pa se med mirovanjem naprave. Sprememba pH med čiščenjem tako v kislo, kot v bazično okolje prispeva k hitrejšemu mašenju membrane. Diskusija obravnava mehanizme zadrževanja DCP in MCPD ter mašenja membran.

• Language: Slovenian
• Keywords: nanofiltracija, diafiltracija, PAE smola, mašenje membran, stopnja zadrževanja, efekt sita, hidrofobnost, površinski naboj, sprememba pH, mreženje polimerov
• Work type: Master's thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2017
• PID: 20.500.12556/RUL-95551
• Publication date in RUL: 20.09.2017

Secondary language

• Language: English
• Title: Experimental testing of procedures for nanofiltration of polyamideamine-epichlorohydrin resins

Abstract

The paper deals with diafiltration of a solution of PAE resin, the purpose of which is to lower the concentration of residuals DCP and MCPD. Nanofiltration membranes Koch SR3D and Koch SelRO MPS-34, both with MWCO of 200 daltons are used. Short term an long term changes in permeability of membranes, as well as rejection of DCP and MCPD are recorded. Filtration is taking place at neutral pH. As expected, results show that PAE resin does not permeate through the membrane. More unexpected is the fact that DCP and MCPD do not permeate through the membrane freely. Results show there is no membrane fouling during the operation, but the membrane fouls when the device is stationary. Change of pH both towards the acidic, as well as caustic environment, contributes to faster membrane fouling. We discuss mechanisms of rejection of DCP and MCPD and mechanisms of membrane fouling.

• Keywords: nanofiltration, diafiltration, PAE resin, membrane fouling, membrane rejection, sieving effect, hydrophobicity, surface charge, change of pH, polimer cross-linking