Studies on ultrafiltration of spent sulfite liquor using various membranes for the recovery of lignosulphonates

Bhattacharya, Paramita; Todi, R.K.; Tiwari, Manoj Kumar; Bhattacharjee, Chiranjib; Bhattacharjee, Sekhar; Datta, Siddhartha

doi:10.1016/j.desal.2004.09.017

Cited by 60 publications

(41 citation statements)

References 10 publications

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“…Lignosulphonates represent a polydispersed system with a wide molecular mass distribution from 200 to 15,000 kg mol À1 . Pore blocking and adsorption would be expected to occur when filtration is carried out using a 20 kg mol À1 MMCO membrane (Bhattacharya et al, 2005). Weis et al (2005) found that the phenolic compounds and acids in the SSL contribute significantly to the fouling problems during the filtration of lignosulphonates.…”

Section: Ultrafiltration Of Ssl Feedmentioning

confidence: 99%

An experimental investigation into the pre-treatment of synthetic membranes using sodium hydroxide solutions

Jones

Bird

Pihlajamäki

2011

Journal of Food Engineering

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Section: Ultrafiltration Of Ssl Feedmentioning

confidence: 99%

An experimental investigation into the pre-treatment of synthetic membranes using sodium hydroxide solutions

Jones

Bird

Pihlajamäki

2011

Journal of Food Engineering

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“…UF has been shown to have the potential to separate LS fractions with low polydispersity, whether it is applied to commercial LS (Gardon and Mason 1955;Tsapiuk et al 1989;Buchholz et al 1992;Zhou et al 2006;Yang et al 2008) or directly to the spent sulfite liquor (SSL) (Bhattacharya et al 2005;Ringena et al 2005). LS can also be fractionated based on their solubility in ethanol (EtOH)/ water solutions: low MW fractions were found to be soluble in highly concentrated EtOH solutions, whereas high MW fractions were only soluble in diluted solutions (Luh and Frederick 1992;Fredheim et al 2002).…”

Section: Introductionmentioning

confidence: 98%

Fractionation of lignosulfonates: comparison of ultrafiltration and ethanol solubility to obtain a set of fractions with distinct properties

Duval¹,

Molina-Boisseau

Chirat

2014

Holzforschung

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Commercial lignosulfonates (LS), recovered from bisulfite pulping processes, are known for their wide polydispersity. In this study, LS were fractionated by ultrafiltration (UF) and based on their solubility in ethanol (EtOH) solutions. The combination of both methods leads to a set of fractions of varying properties, suitable for several applications. UF gives well-separated fractions, with low polydispersity, and increasing functionality (sulfonate and phenolic hydroxyl groups) with decreasing molecular weight (MW). EtOH solubility yields more polydisperse fractions but still appears to be an easy and rapid way to obtain fractions with increasing MW. The residual sugars in LS, resulting from incomplete removal of hemicelluloses, were found to be mainly in the form of low MW oligomers, which were not bound chemically to lignin. Thermal degradation of the different fractions was also compared, giving better comprehension of the influence of the structure and composition. A glass transition temperature (T g ) could be measured for some fractions and was correlated to their MW.

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“…The fouling flux decline curves for all cycles and protocols over time showed a steep decline which developed into a lower steady state flux (results not shown). Previous workers have shown that the flux decline during SSL filtration is due to a range of fouling phenomena such as concentration polarisation, irreversible fouling, pore blocking, and gel layer formation (11,15,20). The composition of SSL can be seen in Table 1.…”

Section: Results and Discussion Flux Measurementsmentioning

confidence: 98%

“…The composition of SSL can be seen in Table 1. It contained 5.9 wt.% lignosulphonates, which represents a polydisperse system with a wide range of molar mass distribution from 200 to 15,000 g mol À1 (20). Therefore, pore blocking and adsorption would be expected to occur during separation using a 20 kg mol À1 MMCO membrane.…”

Section: Results and Discussion Flux Measurementsmentioning

confidence: 99%

The Role of Synthetic Membrane Pre-Treatment in Influencing Filtration Performance over Multiple Operational Cycles

Jones

Pihlajamäki

Bird

2012

Separation Science and Technology

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Manufacturers of polymeric membrane filters used for treating food streams routinely recommend that they are chemically cleaned prior to first use. In this paper, two pre-treatment methods are compared for the filtration of a spent sulphite liquor [SSL] (17.8 wt.% dry solids) using a 20 kg mol À1 molar mass cut off (MMCO) fluoropolymer membrane. In an extension of previous work that considered the effect of the application of a pre-treatment protocol over a single operational cycle, this paper reports the effect of pre-treatment protocols over four complete fouling and cleaning cycles. The pre-treatment methods evaluated were the conditioning with water at 60 C only [Protocol 1], and the conditioning with water at 60 C followed by cleaning with 0.5 wt.% NaOH [Protocol 2]. Results are presented that demonstrate that for the system examined, the positive effect of the NaOH pre-treatment protocol diminished after three complete operational cycles, and disappeared after four cycles.

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Studies on ultrafiltration of spent sulfite liquor using various membranes for the recovery of lignosulphonates

Cited by 60 publications

References 10 publications

An experimental investigation into the pre-treatment of synthetic membranes using sodium hydroxide solutions

An experimental investigation into the pre-treatment of synthetic membranes using sodium hydroxide solutions

Fractionation of lignosulfonates: comparison of ultrafiltration and ethanol solubility to obtain a set of fractions with distinct properties

The Role of Synthetic Membrane Pre-Treatment in Influencing Filtration Performance over Multiple Operational Cycles

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