Chemical Composition of Spent Liquors from Acidic Magnesium–Based Sulphite Pulping ofEucalyptus globulus

Physico-Chemical Alternatives in Lignocellulosic Materials in Relation to the Kind of Component for Fermenting Purposes

“…The chemical composition depends on the wood species used for the pulping and this information is essential regarding eventual liquor utilization for different purposes [167,170,171]. Typical spent sulphite liquor from Eucalyptus globulus contains lignosulphonates, from 60 to 80 g/L, and sugars, from 35 to 45 g/L, from hydrolysed hemicelluloses, mainly xylose.…”

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

“…The FTIR spectrum for lignosulphonates has been studied by Marques et al (2009) and the data wavelength areas and peaks which are characteristic of lignosulphonates were identified. Comparing this data with all the fouling spectra in this section, evidence of lignosulphonate fouling is shown in the following regions; (i) a common aromatic ring vibration bands at 1579 and 1486 cm À1 , (ii) an asymmetric C-H deformation at 1432 cm À1 , (iii) and specific bands at 1181, 1006, 831, and 719 cm À1 which confirm the presence of significant amounts of sulphonic groups.…”

Extraction of phenolic compounds and succinic acid production from spent sulphite liquor

“…The extraction with ethyl acetate leads to the recovery of a fraction rich in phenolic compounds with high antioxidant activity that could find applications as wood preservative, biocide or for the production of resins . Ethyl acetate is the most commonly used solvent for the extraction of phenolic compounds from liquid matrices …”