𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Reaction kinetics in oxygen bleaching

✍ Scribed by C. L. Hsu; J. S. Hsieh

Publisher
American Institute of Chemical Engineers
Year
1988
Tongue
English
Weight
559 KB
Volume
34
Category
Article
ISSN
0001-1541

No coin nor oath required. For personal study only.

✦ Synopsis

The oxygen bleaching of wood pulp takes place in a heterogeneous system involving oxygen (gas), water (liquid), and fiber (solid). Inconsistent effects of process variables (reaction temperature, alkali concentration, and oxygen pressure) on the overall oxygen delignification rate of wood pulp in various reacting systems have been reported in the literature.

An apparent intrinsic reaction rate model, excluding the interphase mass transfer effects, has been developed based on oxygen bleaching experiments in an agitated and ultralow-consistency (solids content) reactor. The apparent intrinsic reaction rate model shows a faster delignification rate than those reported in the literature. The degree of inadequate delignification observed in the literature data is likely to be caused by insufficient mass transfer of bleaching chemicals to fibers.

📜 SIMILAR VOLUMES

Modelling oxygen solubility in bleaching
Modelling oxygen solubility in bleaching solutions
✍ Desmond Tromans 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 426 KB

## Abstract A general thermodynamics‐related model of oxygen solubility, previously developed for water and aqueous inorganic solutions, has been applied to bleaching solutions. The model allows estimations of dissolved oxygen concentrations to be made for different combinations of temperature, oxy

Kinetics of the propylene—Oxygen flame r
Kinetics of the propylene—Oxygen flame reaction
✍ R. Burke; F. Dewael; A. Van Tiggelen 📂 Article 📅 1963 🏛 Elsevier Science 🌐 English ⚖ 417 KB

## Flame propagation velocities and temperatures have been measured in propylene-oxygen mixtures at different mixture strengths and varying dilutions with nitrogen. ## An activation energy of 40 kcal and a mean molecular weight of chain carriers of 32 can be derived from these measurements. Th

Kinetics and mechanism of hydrogen–oxyge
Kinetics and mechanism of hydrogen–oxygen difluoride reaction in magnesium
✍ Thomas J. Houser 📂 Article 📅 1978 🏛 John Wiley and Sons 🌐 English ⚖ 424 KB

The kinetics of the Hz-OFz reaction was studied in the temperature range of 16O0-31O"C a t 1 atm total pressure in a magnesium stirred-flow reactor. initial concentration ranges were '/s-'/z mol-% OFz, 3/16-5 mol-% Hz, and ' /4-5.0 mol.% 0 2 ; helium was used as the diluent. When the reactants were

Kinetics of the branching step in the hy
Kinetics of the branching step in the hydrogen-oxygen reaction
✍ S.C. Kurzius; M. Boudart 📂 Article 📅 1968 🏛 Elsevier Science 🌐 English ⚖ 660 KB

Lower explosion limits in hydrogco-oxygco and deuterium-oxyge/\* mixtures have been measured in the diffusion regime, From the data, rate constants are calculated for 1he reactions H + O~ ~ OH + O and D + O~ ~ OD + O between 800 ' ~ and ! 000~K. Activation energies are found to differ by the differe

Kinetics of the graphite-oxygen reaction
Kinetics of the graphite-oxygen reaction near 1000°K
✍ R.J. Tyler; H.J. Wouterlood; M.F.R. Mulcahy 📂 Article 📅 1976 🏛 Elsevier Science 🌐 English ⚖ 1013 KB

T'he kinetics of oxidation of spectroscopic grade ~lycrystall~ne graphite have been studied by a flow method which allowed the partial pressure of oxygen &,I to be changed abruptly during the coursd of the reaction. The changes were made in two alternative ways: by changing the total pressure of an