Retention and flux characteristics of nanofiltration membranes during hemicellulose prehydrolysate concentration

Ajao, Olumoye; Rahni, Mohamed; Marinova, Mariya; Chadjaa, Hassan; Savadogo, O.

doi:10.1016/j.cej.2014.09.007

Cited by 25 publications

(15 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the contrary, lignin and hemicelluloses were not separated from a mild alkaline extract of sugarcane bagasse by filtration on 1 to 50 kDa organic and inorganic membranes, both compounds being retained over 90% at 20 • C on a 10 kDa polysulfone hollow fiber membrane whereas inorganic salts, acetic acid and phenolic monomers passed through the membrane [108]. Membranes with even smaller MWCO, for instance about 200-400 Da, can retain more than 97% of the hemicelluloses from a wood steam hydrolysate, but are not suitable for purifying hemicelluloses extracts as small molecules present high retention rate as well, i.e., acetic acid (70%), furfural (70%) or HMF (85%) [109].…”

Section: Cross-flow Membrane Filtrationmentioning

confidence: 99%

Lignocellulosic Biomass Mild Alkaline Fractionation and Resulting Extract Purification Processes: Conditions, Yields, and Purities

2020

View full text Add to dashboard Cite

Fractionation of lignocellulose is a fundamental step in the valorization of cellulose, hemicelluloses, and lignin to produce various sustainable fuels, materials and chemicals. Strong alkaline fractionation is one of the most applied processes since the paper industry has been using it for more than a century, and the mineral acid fractionation process is currently the most applied for the production of cellulosic ethanol. However, in the last decade, mild alkaline fractionation has been becoming increasingly widespread in the frame of cellulosic ethanol biorefineries. It leads to the solubilization of hemicelluloses and lignin at various extent depending on the conditions of the extraction, whereas the cellulose remains insoluble. Some studies showed that the cellulose saccharification and fermentation into ethanol gave higher yields than the mineral acid fractionation process. Besides, contrary to the acid fractionation process, the mild alkaline fractionation process does not hydrolyze the sugar polymers, which can be of interest for different applications. Lignocellulosic mild alkaline extracts contain hemicelluloses, lignin oligomers, phenolic monomers, acetic acid, and inorganic salts. In order to optimize the economic efficiency of the biorefineries using a mild alkaline fractionation process, the purification of the alkaline extract to valorize its different components is of major importance. This review details the conditions used for the mild alkaline fractionation process and the purification techniques that have been carried out on the obtained hydrolysates, with a focus on the yields and purities of the different compounds.Clean Technol. 2020, 2 92 (also known as Kraft) processes. These processes induce the dissociation of cellulose fibers from lignin and hemicelluloses by the cooking chemicals [8,9]. Kraft and soda processes rely on alkaline chemicals, the former being mainly used for wood hydrolysis, while the latter is commonly applied to non-wood biomass, such as bagasse, straw, grass or bamboo [9]. In both processes, lignin, low molecular weight hemicelluloses and other extractives from the wood are dissolved in what is called the black liquor [10]. The third process in the papermaking industry is the sulfite process, developed by Tilghman [11]. The wood chips are cooked in a mixture of sulfurous acid and bisulfide ions which dissolve lignin and hemicelluloses [12]. Sulfite pulps account for less than 10% of the total chemical pulp production [13].For decades, the black liquor was burnt to produce steam and electricity. The characterization, fractionation, and recovery of the compounds from black liquor in order to valorize them into materials and chemicals appeared only in the 1980s [14,15]. With the expansion of lignocellulosic biorefineries to produce other materials than paper -energy (liquid fuels like ethanol) and chemical intermediates -and the constraint of limiting the cost of the fractionation step, mild alkaline fractionation gained importance [16,17]. It also challenges the acid fra...

show abstract

Section: Cross-flow Membrane Filtrationmentioning

confidence: 99%

Lignocellulosic Biomass Mild Alkaline Fractionation and Resulting Extract Purification Processes: Conditions, Yields, and Purities

2020

View full text Add to dashboard Cite

show abstract

“…Although ABE fermentation with Clostridium acetobutylicum has been well known, improvements are still being proposed to decrease the cost of substrate and the subsequent operating costs. In a previous work conducted by Ajao et al [4,5], the detoxification of a wood pre-hydrolysate, obtained from a dissolving Kraft pulp mill, was conducted by filtration and flocculation, prior to ethanol production by fermentation.…”

Section: Introductionmentioning

confidence: 99%

Phenols Removal from Hemicelluloses Pre-Hydrolysate by Laccase to Improve Butanol Production

2017

Self Cite

View full text Add to dashboard Cite

Phenolic compounds are important inhibitors of the microorganisms used in the Acetone-Butanol-Ethanol (ABE) fermentation. The degradation of phenolic compounds in a wood pre-hydrolysate, a potential substrate for the production of ABE, was studied in this article. First, physicochemical methods for detoxification such as nanofiltration and flocculation were applied and the best combination was selected. With a flocculated sample, the concentration of phenolic compounds decreases from 1.20 to 0.28 g/L with the addition of a solid laccase at optimum conditions, which is below the phenolic compounds limit of inhibition. This results in an increase in butanol production, more than double, compared to a pre-hydrolysate non-treated with laccase enzymes.

show abstract

“…Other researchers have treated membrane application in biorefineries with emphasis on the removal of inhibitors from real and synthetic hydrolysate solutions prior to the conversion of sugars into biofuels or biochemicals by fermentation [ 15 , 16 , 17 , 18 , 19 , 20 ]. Some of those earlier reported studies have been reviewed [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ], and a few relevant examples are summarized in Table 1 .…”

Section: Introductionmentioning

confidence: 99%

“…Industrial applicability of membrane filtration, coupled with a pulping process, has also been investigated at the pilot scale [ 37 , 38 ]. Except for the related work by the authors [ 28 ], no other study on the application of either reverse osmosis or nanofiltration membranes for hemicellulose concentration in a furfural process was found in the existing literature. Previous work of the authors has shown that flux decline could limit the application of membrane filtration during prehydrolysate concentration.…”

Section: Introductionmentioning

confidence: 99%

Study of Separation and Fouling of Reverse Osmosis Membranes during Model Hydrolysate Solution Filtration

et al. 2017

Self Cite

View full text Add to dashboard Cite

Prehydrolysate, a dilute solution consisting mainly of pentoses, hexoses, and lesser quantities of organic acids, furfural and phenolics, is generated in the Kraft dissolving pulp process. An obstacle facing the valorization of the solution in hemicellulose biorefineries, by conversion of the sugars into bioproducts such as furfural, is the low sugar concentration. Membrane filtration is typically proposed in several hemicellulose based biorefineries for concentrating the solution, although they are usually generated using different wood species, pretreatment methods, and operating conditions. However, the chemical composition of the solutions is generally not considered. Also, the combined effect of composition and operating conditions is rarely investigated for biorefinery applications. The purpose of this work was to determine the impact of the prehydrolysate composition and operating parameters on the component separation and permeate flux during membrane filtration. Using model prehydrolysate solutions, two commercial reverse osmosis (RO) membranes were screened, and one was selected for use, based on its higher sugar and acetic acid retention. A Taguchi L18 experimental design array was then applied to determine the dominant parameters and limiting factors. Results showed that the feed pressure and temperature have the highest impact on permeate flux, but the least effect on sugar retention. Further experiments to quantify flux decline, due to fouling and osmotic pressure, showed that furfural has the highest membrane fouling tendency, and can limit the lifetime of the membrane. Regeneration of the membrane by cleaning with a sodium hydroxide solution is also effective for reversing fouling. It has been demonstrated that RO can efficiently and sustainably concentrate wood prehydrolysate.

show abstract

Retention and flux characteristics of nanofiltration membranes during hemicellulose prehydrolysate concentration

Cited by 25 publications

References 18 publications

Lignocellulosic Biomass Mild Alkaline Fractionation and Resulting Extract Purification Processes: Conditions, Yields, and Purities

Lignocellulosic Biomass Mild Alkaline Fractionation and Resulting Extract Purification Processes: Conditions, Yields, and Purities

Phenols Removal from Hemicelluloses Pre-Hydrolysate by Laccase to Improve Butanol Production

Study of Separation and Fouling of Reverse Osmosis Membranes during Model Hydrolysate Solution Filtration

Contact Info

Product

Resources

About