Back Cover: Aqueous-Phase Hydrodeoxygenation of Biomass Sugar Alcohol into Renewable Alkanes over a Carbon-Supported Ruthenium with Phosphoric Acid Catalytic System (ChemCatChem 5/2017)

ChemCatChem ◽  
2017 ◽  
Vol 9 (5) ◽  
pp. 898-898
Author(s):  
Yujing Weng ◽  
Tiejun Wang ◽  
Songbai Qiu ◽  
Chenguang Wang ◽  
Longlong Ma ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Aqueous Phase ◽  
Catalytic System ◽  
Sugar Alcohol ◽  
Back Cover

Aqueous-Phase Hydrodeoxygenation of Biomass Sugar Alcohol into Renewable Alkanes over a Carbon-Supported Ruthenium with Phosphoric Acid Catalytic System

ChemCatChem ◽  
2017 ◽  
Vol 9 (5) ◽  
pp. 774-781 ◽  
Author(s):  
Yujing Weng ◽  
Tiejun Wang ◽  
Songbai Qiu ◽  
Chenguang Wang ◽  
Longlong Ma ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Aqueous Phase ◽  
Catalytic System ◽  
Sugar Alcohol

High yield of renewable hexanes by direct hydrolysis–hydrodeoxygenation of cellulose in an aqueous phase catalytic system

RSC Advances ◽  
2015 ◽  
Vol 5 (15) ◽  
pp. 11649-11657 ◽  
Author(s):  
Yong Liu ◽  
Lungang Chen ◽  
Tiejun Wang ◽  
Xinghua Zhang ◽  
Jinxing Long ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Aqueous Phase ◽  
Catalytic System ◽  
Side Product ◽  
Layered Compounds ◽  
High Yield ◽  
System P ◽  
Direct Hydrolysis

In aqueous phosphoric acid, cellulose was efficiently converted into hexanes using a Ru/C catalyst combined with layered compounds. The layered compounds showed powerful inhibition of isosorbide, the side-product for the cellulose-to-hexanes route.

Supported Aqueous-Phase Palladium Catalysts for the Reaction of Allylic Substitution:  Toward an Understanding of the Catalytic System

1998 ◽  
Vol 17 (1) ◽  
pp. 78-89 ◽  
Author(s):  
Sylvia dos Santos ◽  
Yuye Tong ◽  
Françoise Quignard ◽  
Agnès Choplin ◽  
Denis Sinou ◽  
...  
Keyword(s):  
Aqueous Phase ◽  
Catalytic System ◽  
Palladium Catalysts ◽  
Allylic Substitution ◽  
Supported Aqueous Phase

scholarly journals Back Cover: Thermodriven Micrometer-Scale Aqueous-Phase Separation of Amphiphilic Oligoethylene Glycol Analogues (Chem. Asian J. 10/2014)

2014 ◽  
Vol 9 (10) ◽  
pp. 3012-3012
Author(s):  
Shunichi Kawasaki ◽  
Takahiro Muraoka ◽  
Haruki Obara ◽  
Takerou Ishii ◽  
Tsutomu Hamada ◽  
...  
Keyword(s):  
Phase Separation ◽  
Aqueous Phase ◽  
Back Cover ◽  
Oligoethylene Glycol ◽  
Micrometer Scale

scholarly journals Adsorption of lanthanides(III) from aqueous solutions by fullerene black modified with di(2-ethylhexyl)phosphoric acid

2009 ◽  
Vol 7 (1) ◽  
pp. 54-58 ◽  
Author(s):  
A. Turanov ◽  
V. Karandashevb
Keyword(s):  
Synergistic Effect ◽  
Phosphoric Acid ◽  
Aqueous Solutions ◽  
Aqueous Phase ◽  
Atomic Number ◽  
Electric Arc ◽  
Analysis Method ◽  
Sorbent Phase ◽  
Fullerene Black ◽  
Slope Analysis

AbstractFullerene black (FB) - a product of electric arc graphite vaporization after extraction of fullerenes - was modified with the di(2-ethylhexyl)phosphoric acid (D2EHPA). The distribution of D2EHPA between FB and aqueous HNO3 solutions has been studied. The effect of HNO3 concentration in the aqueous phase and that of D2EHPA concentration in the sorbent phase on the adsorption of microquantities of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y nitrates from HNO3 solutions by D2EHPA-modified FB are considered. The stoichiometry of the sorbed complexes has been determined by the slope analysis method. The efficiency of lanthanides’ adsorption increases with an increase in the element atomic number. A considerable synergistic effect has been observed upon the addition of the neutral bidentate tetraphenylmethylenediphosphine dioxide ligand to D2EHPA in the sorbent phase.

scholarly journals DETERMINATION OF TYPE OF SOLVATE OF PHOSPHORIC ACID DURING ITS EXTRACTION BY TRIBUTYL PHOSPHATE

2019 ◽  
Vol 62 (5) ◽  
pp. 104-109
Author(s):  
Nikolai F. Kizim ◽  
Anastasiya E. Tarasenkova
Keyword(s):  
Phosphoric Acid ◽  
Aqueous Solutions ◽  
Aqueous Phase ◽  
Equilibrium Constants ◽  
Material Balance ◽  
Mass Action ◽  
Acid Extraction ◽  
Processes And Reactions ◽  
Ionic Equilibria

The extraction of phosphoric acid with a solution of tri-n-butyl phosphate (TBP) in toluene from its individual aqueous solutions in a concentration range of 0-11 M is investigated. The experiments are performed at room temperature (20 ± 1 °С). The isotherms of extraction of phosphoric acid under conditions of equality of the volumes of the saturating aqueous phase and the receiving organic phase are constructed. The extraction isotherm is nonlinear, but to an acid concentration in the aqueous phase of ~ 8 M, it is close to linear, and at higher concentrations, the amount of extracted acid increases harshly. To establish the mechanism of acid extraction in the system phosphoric acid – 0.1 M solution of TBP in toluene the method of combining a laboratory and computational experiment is proposed. The optimal parameters describing the extraction of phosphoric acid from natural aqueous solutions are determined. Calculations performed in two approximations were made. In the first approximation the condition of ideality of systems is accepted. In the second approximation the deviations of the properties of phosphoric acid solutions in aqueous solution are taken into account. For the two approximations the preferential extraction of phosphoric acid molecules in the form of H3PO4 ∙ nTBP type solvates (where n = 1, 3) is shown. In the range of concentrations of phosphoric acid in the aqueous phase from 6 to 11 M, the values of equilibrium constants are estimated, which describe the processes and reactions occurring in the system: stepwise dissociation of acid, distribution of TBP, formation of solvates of phosphoric acid, distribution of the resulting solvates of acid, displacement of ionic equilibria in aqueous phase. Mathematically these processes are taken into account using the law of mass action and the equations of material balance. It is believed that the system has established an equilibrium corresponding to a given temperature and pressure. The calculated values of solvate concentrations are in satisfactory agreement with experimental data.

Kinetics of solvent extraction of metal ions with HEDHP. III. The kinetics and mechanism of solvent extraction of Cr(III) from acidic aqueous solutions with bis-(2-ethyl hexyl) phosphoric acid in benzene

1979 ◽  
Vol 57 (23) ◽  
pp. 3011-3016 ◽  
Author(s):  
Muhammad Fakhrul Islam ◽  
Ranjit Kumar Biswas
Keyword(s):  
Solvent Extraction ◽  
Phosphoric Acid ◽  
Aqueous Phase ◽  
Organic Phase ◽  
Forward Rate ◽  
Nitrate Ions ◽  
Rate Determining Step ◽  
Ethyl Hexyl ◽  
Ph Range ◽  
Kinetics Of

The rate of solvent extraction of chromium(III) from aqueous sulphuric acid solutions (containing 0.05 mol dm−3 sulphate ion and 0.25 mol dm−3 acetate buffer, ionic strength, I = 0.40 mol dm−3) with bis-(2-ethyl hexyl) phosphoric acid (HDEHP or H2A2) in benzene has been measured under various conditions. The rate of backward extraction measurement of Cr(III) from organic phase to aqueous phase is not possible due to the inert property of Cr(III)–DEHP chelate. The forward rate is found to be first-order w.r.t. Cr(III) concentration in the aqueous phase and HDEHP concentration in the organic phase. The order w.r.t. H+ concentration varies from −1 to 1 over the pH range 1.5 to 5.25. The rate is found to decrease with increasing sulphate and nitrate ions concentrations in the aqueous phase. At (30 ± 1) °C, the rate expression, in the presence of sulphate, acetate, and nitrate ions, is found to be represented by:[Formula: see text]In the absence of the anions, the formation of CrHA22+ intermediate complex (Cr(OH)2+ + H2A2(0) → CrHA22+ + H2O) is the rate determining step at all acidities. The effects of the anions on the rate are discussed.

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