Lactic acid recovery by microfiltration using niosomes as extraction agents

Roque, Lara; Escudero, Isabel; Benito, José M.

doi:10.1016/j.seppur.2015.07.018

Cited by 12 publications

(18 citation statements)

References 41 publications

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“…With these technologies high purity and high yield of lactic acid can be achieved. Furthermore, membrane units are easily integrated in a conventional production line …”

Section: Approach To Problem Solvingmentioning

confidence: 99%

Potential and assessment of lactic acid production and isolation - a review

Jantasee

Kienberger

Mungma

et al. 2017

J. Chem. Technol. Biotechnol

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The majority of commodity plastics is made from petroleum-based chemicals. Lactic acid serves as a monomer for the production of the biodegradable polymer polylactic acid (PLA). This paper provides a review on the state of the art production and isolation process for lactic acid. Problems in production and isolation have been identified, the relevant results in optimized production are presented in the first part of the paper. In the second part, a decision matrix is used as a guideline for the discussion on the state of research in the isolation and purification of lactic acid. Mechanical unit operations, mass transfer unit operations, reactive separation techniques, and process combinations are reported in the literature. At the end, an economic evaluation of isolation processes such as conventional precipitation, reactive membrane separation, and reactive distillation are presented.

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“…With these technologies high purity and high yield of lactic acid can be achieved. Furthermore, membrane units are easily integrated in a conventional production line …”

Section: Approach To Problem Solvingmentioning

confidence: 99%

Potential and assessment of lactic acid production and isolation - a review

Jantasee

Kienberger

Mungma

et al. 2017

J. Chem. Technol. Biotechnol

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“…Niosomes were prepared by ultrasonication of 10 cm 3 aqueous solutions of Span 80 (20 mol/m 3 ) and SDS (4 mol/m 3 ). These concentrations were chosen on the basis of previous works [15,21]. The application of ultrasounds was carried out over a 5-min effective time, by pulses every 5 s (5 s on and 5 s off, 60 cycles; 30% amplitude, 500 W), to avoid overheating of the sample, using a high-intensity ultrasonic processor (Vibra-Cell VCX 500, Sonics & Materials Inc., USA) equipped with a 3 mm-diameter titanium alloy bicylindrical probe.…”

Section: Niosome Formationmentioning

confidence: 99%

“…In this way, hollow-fiber contactors using organic solvents [8][9][10] and micellar enhanced ultrafiltration (MEUF) using surfactants have been studied [11][12][13][14]. More recently, the use of niosomes as lactic acid extraction agents has also been studied [15].…”

Section: Introductionmentioning

confidence: 99%

“…The membrane hybrid process of lactic acid extraction by niosomes formulated with Span 80 and SDS in pre-saturation concentrations, using a 0.20 µm pore size flatdisc TiO 2 microfiltration membrane and 0.3 bar of transmembrane pressure, has been studied in a previous work [15]. Best results showed a 33% lactic acid extraction degree after 30 min equilibrium time, using niosomes of Span 80 (20 mol/m 3 ) and SDS (4 mol/m 3 ) as extraction agents, pH < pKa of lactic acid (pKa = 3.4), and a SDS/lactic acid molar ratio of 0.01.…”

Section: Introductionmentioning

confidence: 99%

“…This work is a continuation of the previous one [15] and aims to model and optimize the removal of lactate ion from back-extraction aqueous solutions at pH > 12 containing Span 80 and SDS surfactants in the stated concentrations, using ultrafiltration membranes. A Central Composite Design (CCD) and Response Surface Methodology (RSM) were used to study the effect of the factors (lactate ion concentration, transmembrane pressure, and membrane nominal molecular weight limit), on the permeate flux and rejection of components.…”

Section: Introductionmentioning

confidence: 99%

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Separation of sodium lactate from Span 80 and SDS surfactants by ultrafiltration

Roque

Escudero

Benito

2017

Separation and Purification Technology

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The ultrafiltration process for separation of sodium lactate from sorbitan monooleate (Span 80) and sodium dodecyl sulfate (SDS) surfactants using ZrO 2 flat-disc ultrafiltration membranes was studied in this 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 (C A) on the permeate flux (J p) and rejections observed to ion lactate (R A) and SDS (R S) using a full central composite experimental design and response surface methodology. Experiments were conducted in four stages: a first stage of lactic acid extraction with niosomes formulated with Span 80 (20 mol/m 3) and SDS (4 mol/m 3), a second backextraction stage conducted by NaOH addition until pH > 12 for niosomes breaking and sodium lactate releasing, and a third and fourth ultrafiltration stages at 25 o C to separate the lactate ions from the mixed surfactants. Membrane NMWL, TMP and their interactions presented statistically significant influence on the permeate flux. 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 obtained for a 2 bar TMP and 15 kDa NMWL membrane. Under these conditions, the rejections of SDS surfactant and lactate ion were 87.3% and 4.31%, respectively, with a permeate flux of 42.63 L/m 2 h. The antagonistic effect between permeate flux and SDS rejection is also proved.

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