The aim of this paper is to investigate the effect of two types of lignosulfonates on dispersion and hydration of cement paste. ... K. De Weerdt, Cem. Concr. Res., 2017, 1, 98. [3] P. Aitcin ...

In the prior sections, the main methods for lignin extraction have been already presented, namely the traditional industrial processes (Kraft and sulfite) and the …

In the sulfite process lignosulfonates (LS) are liberated in the digestion step into the spent liquor. Water solubility over the entire pH range and the complex matrix of the process stream makes lignosulfonate isolation challenging. A possible approach for the selective isolation of lignosulfonates is the extraction using amines as reactive agent.

Crud formation during reactive extraction hinders phase separation and makes the application of conventional extraction equipment more challenging. This study …

Les lignosulfonates ont été fractionnés en cinq fractions de différents poids moléculaire et polydispersité variant de 1400 g.mol-1 à 19500 g.mol-1 et de 1,4 à 3,5 respectivement.

In the process, the hot compressed water is put in contact with the woody-biomass for up to a quarter of an hour at a temperature up to 200 °C. The liquid hot water process allows to dissolve between 40 and 60% of the total biomass, a great quantity of hemicellulose (up to 80%) and 35–60% of lignin [76]. 4.3.

Spent sulfite liquors (SSLs) were fractionated by two common separation techniques: amine extraction and ultrafiltration. The lignin fractions obtained were …

The extraction of lignosulfonates leads to emulsion and crud formation when standard equipment is applied. By using cellulose films as a support layer between the aqueous feed phase and the organic extractant phase, emulsion formation is prevented.

Depolymerized real lignin products are very complex mixtures. Comprehensive assessment of the decomposition efficiency and characterizing of …

Les lignosulfonates ont été fractionnés en cinq fractions de différents poids moléculaire et polydispersité variant de 1400 g.mol-1 à 19500 g.mol-1 et de 1,4 à 3,5 …

In the process, the hot compressed water is put in contact with the woody-biomass for up to a quarter of an hour at a temperature up to 200 °C. The liquid hot water …

Lignosulfonates are obtained from sulfite pulping processes wherein cellulose is extracted from wood in the pulp industry. The so-called sulfite pulping process involves mixing …

Furthermore, the extraction or pre-treatment processes lead to additional structural changes and modifications of functional groups, making lignin valorisation even more challenging [3,6,7]. Lignin produced by commercial pulp and paper processes, such as kraft lignin or lignosulfonates, contains high amounts of sulphur.

Background: Very few studies of the antiviral potential of lignosulfonates have been published. With the aim of oral application, among various groups of natural products, the relative antiviral potency of lignosulfonate and its ability to rapidly inactivate viruses were investigated. Methods: As target cells, MT-4 cells in suspension and attached Vero cells …

31 P nuclear magnetic resonance (NMR) spectroscopy is the most common and most accurate analytical method to quantitatively determine the hydroxy group contents of technical lignins. However, for lignosulfonates, liquid-state NMR analysis is often limited due to solubility problems in commonly used solvent systems, which may arise from the broad …

The world production of soaps, detergents, and other surfactants is more than 40 Mt, and lignosulfonates can be used as surfactants or dispersants in various …

Spent sulfite liquors (SSLs) were fractionated by two common separation techniques: amine extraction and ultrafiltration. The lignin fractions obtained were characterized with respect to their elemental composition, functional groups and molecular weight distribution. The results of size exclusion chromatography indicate a broad …

solubility lignosulfonates have a high molecular weight and low sulfonation degree, and these properties will make them block in the resin. Additionally, the purification process is very complicated. Headspace GC/MS method [27]isbased on the similar decarboxylation and desulfonation behavior of lignosulfonates when treated with …

This paper aims to study certain aspects of the preparation of tannin–lignin adhesives. Mimosa tannins and lignosulfonates were used in wood adhesives formulation to substitute resins based on formaldehyde. Two ammonium lignosulfonates and two sodium lignosulfonates were glyoxalated to be more reactive. The thermal stability of …

Kraft lignin is a kind of industrial lignin obtained from Kraft pulp, which accounts for about 85% of the total lignin production in the world. The Kraft pulp method is the main method for converting coniferous wood to pulp; the pulping yield is higher than other alkaline pulping methods. In the Kraft cooking process, about 90–95% of the ...

Extraction of lignosulfonates from films showed that the enzymic reaction increased the average molecular weight from <10,000 to up to 66,000. The enzymatic reaction resulted in an increase in the water contact angle of the films from the range 25–49° to 56–81°. The four preparations showed relatively small differences with regard to ...

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. …

L'extraction des hémicelluloses du bois en amont de la production de fibres de cellulose permet la récupération de sucres potentiellement utilisables pour la production d'alcool et de tensio-actifs. Comparez le procédé d'autohydrolyse appliqué à des hémicelluloses de bois feuillus et de résineux.

The extraction of lignosulfonates leads to emulsion and crud formation when standard equipment is applied. By using cellulose films as a support layer between …

Lignosulfonates are generated in the sulfite process and have a high molecular weight (1000-120,000 g/mol) and water solubility, which contributes to their commercial application [33]. In general ...

Therefore, lignosulfonates are considered as a combination of components with different charge-to-size ratios. Since changes in the inherent amphiphilic character of lignosulfonates have an immediate impact on their performance as surface-active agents, having a clear picture of the hydrophobic composition of lignosulfonates is critically