scholarly journals Pilot scale experiments of magnesia hydration under gas-liquid-solid (three-phase) reaction system

2017 ◽  
Author(s):  
Xiaojia Tang ◽  
Qiwei Lv ◽  
Lin Yin ◽  
Yixing Nie ◽  
Qi Jin ◽  
...  
Keyword(s):  
Reaction System ◽  
Pilot Scale ◽  
Phase Reaction ◽  
Three Phase

The analysis of magnesium oxide hydration in three-phase reaction system

2014 ◽  
Vol 213 ◽  
pp. 32-37 ◽  
Author(s):  
Xiaojia Tang ◽  
Lin Guo ◽  
Chen Chen ◽  
Quan Liu ◽  
Tie Li ◽  
...  
Keyword(s):  
Magnesium Oxide ◽  
Reaction System ◽  
Phase Reaction ◽  
Three Phase

scholarly journals Heterogeneous Catalytic Ozonation of Aniline-Contaminated Waters: A Three-Phase Modelling Approach Using TiO2/GAC

Water ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3448
Author(s):  
Cristian Ferreiro ◽  
Natalia Villota ◽  
José Ignacio Lombraña ◽  
María J. Rivero
Keyword(s):  
Reaction System ◽  
Catalytic Ozonation ◽  
Kinetic Constants ◽  
Catalyst Loading ◽  
Solid Catalyst ◽  
Order Kinetic ◽  
Phase Reaction ◽  
Reaction Products ◽  
Heterogeneous Catalytic ◽  
Three Phase

This work aims to study the sustainable catalytic ozonation of aniline promoted by granular active carbon (GAC) doped with TiO2. Aniline was selected as a model compound for the accelerator manufacturing industries used in the manufacture of rubber due to its environmental impact, low biodegradability, and harmful genotoxic effects on human health. Based on the evolution of total organic carbon (TOC), aniline concentration measured using high performance liquid chromatography (HPLC), pH and ozone concentration in liquid and gas phase, and catalyst loading, a three-phase reaction system has been modelled. The proposed three-phase model related the ozone transfer parameters and the pseudo-first order kinetic constants through three coefficients that involve the adsorption process, oxidation in the liquid, and the solid catalyst. The interpretation of the kinetic constants of the process allowed the predominance of the mechanism of Langmuir–Hinshelwood or modified Eley–Rideal to be elucidated. Seven intermediate aromatic reaction products, representative of the direct action of ozone and the radical pathway, were identified and quantified, as well as precursors of the appearance of turbidity, with which two possible routes of degradation of aniline being proposed.

Overall Effectiveness Factor for Slab Geometry in a Three-Phase Reaction System

2014 ◽  
Vol 12 (1) ◽  
pp. 417-427 ◽  
Author(s):  
Diego E. Boldrini ◽  
Gabriela M. Tonetto ◽  
Daniel E. Damiani
Keyword(s):  
Reaction System ◽  
Effectiveness Factor ◽  
Phase Reaction ◽  
Slab Geometry ◽  
Reaction Systems ◽  
Mixed Control ◽  
Three Phase ◽  
Power Law Kinetics ◽  
Theoretical Results ◽  
Overall Effectiveness

Abstract The overall effectiveness factor for slab geometry applicable to uniform washcoats on a monolith surface for three-phase reaction systems was studied in the present work. Analytical solutions for zero-order reactions and Langmuir–Hinshelwood and power law kinetics were reported. The analysis of the theoretical results showed that not considering the geometry of the monolithic system in a proper way lead to 14% errors in reactions parameters when operating under mixed control (kinetic-internal diffusion) and negligible external mass-transfer resistances.

scholarly journals Removal of Formaldehyde by CWO

Proceedings ◽  
2018 ◽  
Vol 2 (23) ◽  
pp. 1471
Author(s):  
Estefania Rodríguez-Carrasco ◽  
Mirella Gutiérrez-Arzaluz ◽  
Violeta Mugica-Álvarez ◽  
Miguel Torres-Rodríguez
Keyword(s):  
Oxidation Reaction ◽  
Mixed Oxides ◽  
Reaction System ◽  
Alpha Phase ◽  
Phase Reaction ◽  
Tertiary Treatment ◽  
Catalytic Wet Oxidation ◽  
Three Phase ◽  
Aqueous Effluents

A large part of the wastewater generated by the Chemical and Transformation Industries are discharged with the presence of organic pollutants, in many cases they contain refractory organic compounds such as formaldehyde in a very low concentration for their recovery to be profitable, but it is high enough for to constitute a source of important pollution, which causes a loss of biodiversity and retards sustainable development. In the present work, the elimination of formaldehyde by the catalytic wet oxidation reaction is evaluated as part of the tertiary treatment of aqueous effluents in a three-phase reaction system, using copper and cobalt mixed oxides catalysts supported in alumina (alpha phase), the results of the characterization of the catalyst used are also shown, by conventional techniques.

A two-phase system for the clean and high yield synthesis of furylmethane derivatives over –SO3H functionalized ionic liquids

2017 ◽  
Vol 19 (20) ◽  
pp. 4804-4810 ◽  
Author(s):  
S. H. Shinde ◽  
C. V. Rode
Keyword(s):  
Ionic Liquids ◽  
Reaction System ◽  
High Yield ◽  
Phase System ◽  
Phase Reaction ◽  
Two Phase ◽  
Yield Production ◽  
High Yield Production

A new and effective unique two-phase reaction system for the high yield production of tri(furyl)methane from furfural and furan.

scholarly journals Au@CoS-BiVO4 {010} Constructed for Visible-Light-Assisted Peroxymonosulfate Activation

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1414
Author(s):  
Yekun Ji ◽  
Ye Zhou ◽  
Jinnan Wang ◽  
Aimin Li ◽  
Weilin Bian ◽  
...  
Keyword(s):  
Visible Light ◽  
Charge Separation ◽  
Reaction System ◽  
Light Response ◽  
Pilot Scale ◽  
Sulfate Radical ◽  
Radical Trapping ◽  
Visible Light Response ◽  
Photogenerated Electrons ◽  
Scale Experiment

A visible-light-Fenton-like reaction system was constructed for the selective conversion of peroxymonosulfate to sulfate radical. Au@CoS, when doped on monoclinic BiVO4 {010} facets, promoted spatial charge separation due to the different energy band between the m-BiVO4 {010} and {110} facets. The visible-light response of m-BiVO4 was enhanced, which was attributed to the SPR effect of Au. And the photogenerated electrons were transferred from the m-BiVO4 {010} facet to Au via a Schottky junction. Owing to higher work function, CoS was able to capture these photoelectrons with acceleration of the Co(Ⅱ)/Co(Ⅲ) redox, enhancing peroxymonosulfate conversion to sulfate radical (Co2+ + HSO5−→ Co3+ + •SO4− + OH−). On the other hand, holes accumulated on m-BiVO4 {110} facets also contributed to organics oxidation. Thus, more than 95% of RhB was degraded within 40 min, and, even after five cycles, over 80% of RhB could be removed. The radical trapping experiments and EPR confirmed that both the sulfate radical and photogenerated hole were the main species for organics degradation. UV-vis DRS, photoluminescence (PL) and photoelectrochemical analyses also confirmed the enhancement of the visible-light response and charge separation. In a pilot scale experiment (PMS = 3 mM, initial TOC = 151 mg/L, reaction time = 4 h), CoS-Au-BiVO4 loaded on glass fiber showed a high mineralization rate (>60%) of practical wastewater.

Catalytic conversion of biomass derivatives to lactic acid with increased selectivity in an aqueous tin(ii) chloride/choline chloride system

2018 ◽  
Vol 20 (17) ◽  
pp. 4112-4119 ◽  
Author(s):  
Asep Bayu ◽  
Akihiro Yoshida ◽  
Surachai Karnjanakom ◽  
Katsuki Kusakabe ◽  
Xiaogang Hao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Lactic Acid ◽  
Aqueous Phase ◽  
Choline Chloride ◽  
Reaction System ◽  
Catalytic Conversion ◽  
Phase Reaction ◽  
Chloride System ◽  
System P

The catalytic activity and selectivity of SnCl2 for the conversion of biomass derivatives into LacA in the aqueous phase reaction system was found to be increased by the addition of choline chloride.

Influence of Compressed Carbon Dioxide on the Oxidation of Cyclohexane with Hydrogen Peroxide in Acetic Acid

2006 ◽  
Vol 59 (3) ◽  
pp. 225 ◽  
Author(s):  
Liang Gao ◽  
Tao Jiang ◽  
Buxing Han ◽  
Baoning Zong ◽  
Xiaoxin Zhang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Binary System ◽  
Reaction System ◽  
Phase Region ◽  
Phase Behaviour ◽  
Phase System ◽  
Two Phase ◽  
Three Phase

The oxidation of cyclohexane with H2O2 in a compressed CO2/acetic acid binary system was studied at 60.0 and 80.0°C, at pressures up to 18 MPa, and with the zeolite TS-1 as catalyst. The phase behaviour of the reaction system was also observed. There are three fluid phases in the reaction system at lower pressure but two at higher pressures. In the three-phase region the yields of the products, cyclohexanol and cyclohexanone, increase considerably with increasing pressure and reaches a maximum near the phase-separating pressure. CO2 can thus enhance the reaction effectively. However, the effect of pressure on the yield is very limited after the transition to a two-phase system.

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