Wavelet neural networks (WNNs) were used to investigate the influence of operational variables in the soda-ethanol pulping of oil palm fronds (viz. NaOH concentration (10-30%), ethanol concentration (15-75%), cooking temperature (150-190 oC), and time (60-180 min)) on the resulting pulp and paper properties (viz. screened yield, kappa number, tensile index, and tear index). Performance assessme...

Kraft wood pulping is the predominant process used in the pulp and paper industry for its versatility and insensitivity to variations of wood supply. In this work, a deterministic model has been developed for a Kraft Pulping Process of Eucalyptus by combining intrinsic kinetic equations (Lignin, Carbohydrates) and it is used to investigate the effects of process conditions on the extent of deli...

To assess the feasibility of implementing hemicellulose recovery stages in kraft mills, Eucalyptus globulus wood samples were subjected to aqueous treatments with hot, compressed water (autohydrolysis processing) to achieve partial dissolution of xylan. Autohydrolyzed solids were subjected to kraft pulping under selected conditions to yield a pulp of low kappa number, and to an optimized TCF bl...

Pyrolysis of chlorinated phenolics and thiolignin was investigated to elucidate the principle step occurring during combustion of organic material in bleach plant effluent. Chlorinated phenolics found in bleach plant effluent. such as chlorophenols, chloroguaiacols, chlorovanillins and chlorosyringaldehydes, were completely decomposed at 700 to 900°C with alkali and oxygen. Organically bound ch...

There is an increasing interest in utilizing xylan from hardwood in the food and non-food area. The liberation of xylan from the cell wall matrix of wood is, however, highly restricted by the strong interactions with the lignin network. Xylan stability against alkaline pulping is particularly high in Eucalyptus globulus owing to its peculiar structure containing galactosyl and glucosyl units at...

A duplex korrózióálló acélok a kiváló korrózióállóságuk mellett nagy szilárdságú alternatívát jelentenek családján belül, ami kettős szövetszerkezetüknek köszönhető. Ez szövetszerkezet azonban jelentősen befolyásolható hegesztési hőciklussal, ezért hegesztésükre megengedett legnagyobb hőbevitel általában 2,5 kJ/mm. Ebben kutatásban hőbevitelű hegesztésre (~ 3 kJ/mm) kifejlesztett, NSSC 2120 jel...

Several hardwood and softwood trees were analyzed for anthraquinone-type components. Wood samples were reduced to a small size and extracted with an organic solvent; the extracts were then concentrated and analyzed by gas chromatography-mass spectroscopy. Low levels of AQ and anthrone components were detected using a sensitive selected-ion monitoring technique. Ten out of seventeen hardwood sam...