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Estimating Pure Diffusion Contributions in Alkaline Pulping Processes
(Planta Piloto de Ingeniería Química, 2002-12)
A model that predicts isothermal alkali diffusion and reaction with acetyl groups in moist wood chips was derived and approximated. System parameters were estimated from unsteady-state experimental data. Simulation results ...
Experimental and theoretical analysis of the alkali impregnation of eucalyptus wood
(American Chemical Society, 2009-05)
Wood impregnation is crucial in any pulping process. The impregnation of chips of eucalyptus wood by a liquor of constant alkali concentration is here analyzed. A mass balance that considers kinetics of the main reactions ...
Kinetics of water diffusion in corn grain during the alkaline cooking at different temperatures and calcium hydroxide concentration
(J.L. Fernández-Muñoz, 2013-01-16)
Spectrophotometric flow-injection determination of sulphite in white wines involving gas diffusion through a concentric tubular membrane
(2003-07-14)
A flow-injection system is proposed for the spectrophotometric determination of sulphite in white wines. The method involves analyte conversion to SO2, gas diffusion through a Teflon® semi-permeable membrane, collection ...
Spectrophotometric flow-injection determination of sulphite in white wines involving gas diffusion through a concentric tubular membrane
(2003-07-14)
A flow-injection system is proposed for the spectrophotometric determination of sulphite in white wines. The method involves analyte conversion to SO2, gas diffusion through a Teflon® semi-permeable membrane, collection ...
Optimal operating points in alkaline pulping
(Planta Piloto de Ingeniería Química, 2004-09)
The problem of optimizing the alkaline impregnation of wood chips is posed and solved under usual restrictions. The cost to be optimized balances opposite criteria by taking economics and product quality into account, and ...
Evaluation of dispersed alkaline substrate and diffusive exchange system technologies for the passive treatment of copper mining acid drainage
(2020-03-01)
The study evaluates the performance of the novel ADES (alkaline diffusive exchange System), SDES (sulfidogenic diffusive exchange system) and DAS (Dispersed Alkaline Substrate) technologies for the passive treatment of ...
Wood capillarity and deacetylation during eucalyptus alkaline impregnation. Suphidity effects and comparison between transverse directions
(de Gruyter, 2013-01)
The relative ion transport capacity of wood, i.e., the Effective Capillary Cross Sectional Area (ECCSA), is determined in this work based on the analogy with the relation between the electrical conductivities of wood and ...
Selective styrene oxidation on alkaline tantalates ATaO3 (A = Li, Na, K) as heterogeneous catalysts
(Elsevier Science, 2019-01-19)
A series of alkaline tantalates (LiTaO3, NaTaO3, KTaO3) prepared using citrate method were characterized by powder X-ray diffraction, nitrogen adsorption isotherms, Fourier transform infrared spectroscopy, diffuse reflectance ...