Results 121 to 130 of about 730 (163)

Ammonium sulfide organosolv pulping

Wood Science and Technology, 1983
The use of ammonium sulfide in aqueous ethanol and methanol was investigated for pulping of wood. Hemlock chips required 21% ammonium sulfide (equivalent to 19% Na2O) at 180°C to become delignified to the kappa range 35–50. The yields exceeded those of conventional kraft pulps by 14% on dry wood basis. Over 75% of the original glucomannan was recovered
V. L. Chiang, K. V. Sarkanen
openaire   +1 more source

Microwave Assisted-Organosolv Pulping of Sugarcane Bagasse

Advanced Science Letters, 2018
Indah Hartati
exaly   +2 more sources

Organosolv Pulping Process Simulations

Industrial & Engineering Chemistry Research, 2008
Computer simulations of organosolv pulping processes (ethanol−water and ethylene glycol−water mixtures) using commercial simulation software (ASPEN PLUS) have been developed in order to design the ...
María González, Álvaro Tejado, Cristina Peña, Jalel Labidi   +3 more
openaire   +1 more source

Hydrothermal conversion of wood, organosolv, and chlorite pulps

Biomass Conversion and Biorefinery, 2019
In this work, beech wood has been submitted to fractionation and hydrothermal liquefaction in order to produce fermentable carbohydrates. Fractionation either by ethanol organosolv or by sodium chlorite/acetic acid (SC/AA) treatment allowed obtaining delignification yields of 50 and 91 wt.% respectively.
Buendia-Kandia, Felipe, Brosse, Nicolas, Petitjean, Dominique, Mauviel, Guillain, Rondags, Emmanuel, Guedon, Emmanuel, Dufour, Anthony   +6 more
openaire   +2 more sources

Photodelignification of Eucalyptus grandis organosolv chemical pulp

Journal of Photochemistry and Photobiology A: Chemistry, 1996
Abstract Efficient delignification of Eucalyptus grandis organosolv pulp was achieved. The process, which was chlorine and sulphur free, removed 88% of the lignin (kappa number (KN) 65 to 8) with moderate viscosity loss ( η = 19 cP to 12 cP). The best sequence involved three photochemical stages in alkaline medium (NaOH) at 85°C.
Antonio Eduardo de Hora Machado, Reinaldo Ruggiero, Manuel G.H. Terrones, Aziz Nourmamode, Stephane Grelier, Alain Castellan   +5 more
openaire   +1 more source

Lignofibre (LGF) organosolv process for producing dissolving pulps

J-FOR: Journal of Science & Technology for Forest Products and Processes, 2013
The potential of different organosolv processes, based on use of acetic acid as the cooking solvent, to produce high-quality pulps meeting the requirements for dissolving pulps was evaluated. The Lignofibre (LGF) and Formacell processes produced pulps with acceptable delignification degree at short cooking times.
Tamminen, Tarja, Liitiä, Tiina, Asikainen, Sari, Poppius-Levlin, Kristiina, Kangas, Heli   +5 more
openaire   +5 more sources

Totally Chlorine Free Bleaching of Organosolv Pulps

Journal of Wood Chemistry and Technology, 2003
Abstract Populus tremula* tremuloides wood samples were processed in acetic acid–water–HCl media (Acetosolv pulping) and then subjected to totally chlorine free (TCF) bleaching sequences in order to obtain dissolving grade pulps. Several bleaching sequences (ZEQP1P2, EOQP1P2, EOPaaQP1P2, and EOZQP1P2) were assayed for this purpose.
J. L. Alonso, J. C. Parajó, R. Yáñez
openaire   +1 more source

Multistage Organosolv Pulping: A Method for Obtaining Pulps with Low Hemicellulose Contents

Collection of Czechoslovak Chemical Communications, 2003
Two-stage treatments of Eucalyptus globulus wood were carried out in HCl-acetic acid-water media in order to obtain high-purity cellulose pulps. The effects of selected operational variables affecting the first pulping stage on the yield and composition of delignified solids were determined.
Severino Abad, Valentín Santos, Juan Carlos Parajó   +2 more
openaire   +1 more source

Organosolv pulping of wheat straw by use of phenol

Bioresource Technology, 1997
Abstract A central composite design was used to investigate the influence of the cooking conditions (time, temperature and phenol concentration) for wheat straw with phenol-water mixtures on the properties of the pulp obtained (yield and holocellulose, α-cellulose, lignin and ethanol-benzene extractable contents) and the pH of the resulting ...
L. Jiménez, M.J. de la Torre, F. Maestre, J.L. Ferrer, I. Pérez   +4 more
openaire   +1 more source

Evaluation of organosolv pulp as a suitable substrate for rapid enzymatic hydrolysis

Biotechnology and Bioengineering, 1983
It has been shown that enzymatic hydrolysis of cellulosic material can be significantly improved by simultaneous attrition. The enhancement is due to the concurrent and continuous formation of reactive sites for association with the enzyme. Various chemical and physical methods are used to modify the substrate and hence increase the rate and extent of ...
M J, Neilson, F, Shafizadeh, S, Aziz, K V, Sarkanen   +3 more
openaire   +2 more sources