RT info:eu-repo/semantics/article
T1 Separation of sodium lactate from Span 80 and SDS surfactants by ultrafiltration
A1 Roque Viadas, Lara
A1 Escudero Barbero, Isabel
A1 Benito Moreno, José Manuel
K1 Lactic acid
K1 Span 80
K1 SDS
K1 Ultrafiltration
K1 Experimental design methodology
K1 Chemical engineering
K1 Ingeniería química
AB The ultrafiltration process for separation of sodium lactate from sorbitan monooleate (Span 80) andsodium dodecyl sulfate (SDS) surfactants using ZrO2 flat-disc ultrafiltration membranes was studied inthis work. The study is focused on the influence of the nominal molecular weight limit of the membrane(NMWL), the transmembrane pressure (TMP), and initial lactic acid concentration (CA) on the permeateflux (Jp) and rejections observed to ion lactate (RA) and SDS (RS) using a full central composite experimentaldesign and response surface methodology.Experiments were conducted in four stages: a first stage of lactic acid extraction with niosomes formulatedwith Span 80 (20 mol/m3) and SDS (4 mol/m3), a second back-extraction stage conducted by NaOHaddition until pH > 12 for niosomes breaking and sodium lactate releasing, and a third and fourth ultrafiltrationstages at 25  C to separate the lactate ions from the mixed surfactants.Membrane NMWL, TMP and their interactions presented statistically significant influence on the permeateflux. Rejections to lactate ion and SDS were lower than 4.5% and higher than 86%, respectively,whereas Span 80 rejection was 100% in all range of experimental conditions tested.The optimal conditions were established for maximum values of permeate flux, and they were obtainedfor a 2 bar TMP and 15 kDa NMWL membrane. Under these conditions, the rejections of SDS surfactantand lactate ion were 87.3% and 4.31%, respectively, with a permeate flux of 42.63 L/m2 h. The antagonisticeffect between permeate flux and SDS rejection is also proved.
PB Elsevier
SN 1383-5866
YR 2017
FD 2017-06
LK http://hdl.handle.net/10259/4568
UL http://hdl.handle.net/10259/4568
LA eng
NO Ministerio de Economía y Competitividad(MINECO, Spain) through project CTQ2011-25239, and from Junta de Castilla y León through project BU055U16 cofinanced by the European Regional Development Fund (ERDFFEDER) is gratefully acknowledged
DS Repositorio Institucional de la Universidad de Burgos
RD 23-nov-2024