DIRECT LIQUEFACTION OF WOOD BY ALKALI AND ALKALINE EARTH SALT IN AN AQUEOUS PHASE

1985 ◽  
Vol 14 (8) ◽  
pp. 1199-1202 ◽  
Author(s):  
Tomoko Ogi ◽  
Shin-ya Yokoyama ◽  
Katsuya Koguchi
Keyword(s):  
Aqueous Phase ◽  
Alkaline Earth ◽  
Alkaline Earth Salt ◽  
Direct Liquefaction

Étude comparée de trois antibiotiques ionophores: X.537 A (lasalocide), A.23187 (calcimycine) et X.14547 A. Complexation des cations IA et IIA, transport de Ca++

1982 ◽  
Vol 60 (8) ◽  
pp. 981-989 ◽  
Author(s):  
Jean Bolte ◽  
Colette Demuynck ◽  
Georges Jeminet ◽  
Jean Juillard ◽  
Claude Tissier
Keyword(s):  
Aqueous Phase ◽  
Alkaline Earth ◽  
Equilibrium Constants ◽  
Alkali Metal Ions ◽  
A 23187 ◽  
Ionic Fluxes ◽  
Stability Of Complexes ◽  
A Cell ◽  
The Stability ◽  
Alkaline Earth Cations

Using a potentiometric method, both the stoechiometry and the stability of complexes formed in methanol between the three natural ionophores and cations IA and IIA have been obtained. With alkali metal ions, neutral complexes of stoechiometry 1:1 for X.537 A and A.23187, 2:1 for X.14547 A are formed. Complexes of higher stability are obtained with alkaline-earth cations, corresponding to two types of association; 1:1 charged and 2:1 neutral. A.23187 and X.14547 A show similar behaviour as far as the sequence of formation of these two complexes is concerned, but the stability constants are higher for the first one. For X.537 A, the existence of a 2:1 complex is not detectable by our method, except for magnesium.Calcium transport by these ionophores through a cell such as: aqueous phase/chloroformic phase/aqueous phase has also been studied. An attempt is made to relate ionic fluxes to the preceding equilibrium constants.

Polyfunctional Derivatives of Imidodiphosphoric Acid as Extractants

1997 ◽  
Vol 62 (4) ◽  
pp. 620-625 ◽  
Author(s):  
Oldřich Navrátil ◽  
Petr Sládek ◽  
Alena Tokárová ◽  
Eckhard Herrmann ◽  
Moein Nouaman
Keyword(s):  
Aqueous Phase ◽  
Distribution Ratio ◽  
Alkaline Earth ◽  
Functional Group ◽  
Extraction Efficiency ◽  
Ester Group ◽  
Alkaline Earth Metals ◽  
Strontium Barium ◽  
Extraction Constants ◽  
Derivatives Of

The distribution of calcium, strontium, barium and scandium between aqueous and organic phases was studied using 0.1 M HNO3 or 0.01 to 0.1 M HCl as the aqueous phase and solutions of selected derivatives of organophosphoric reagents containing the conventional =P(O)NHP(O)= bifunctional group or the analogous trifunctional or tetrafunctional group in various organic solvents as the organic phase. The effect of substitution of one ester group by an OH or NH2 group was examined. While for the alkaline earth metals the distribution ratio increases if the bifunctional group is replaced by a higher-functional group, the reverse is true for scandium. The extraction efficiency is improved by the presence of OH or NH2 substituent groups. The composition of the extracted species was inferred by logarithmic analysis and the corresponding extraction constants were calculated.

Aqueous phase hydrogenation of furfural to tetrahydrofurfuryl alcohol on alkaline earth metal modified Ni/Al2O3

RSC Advances ◽  
2016 ◽  
Vol 6 (56) ◽  
pp. 51221-51228 ◽  
Author(s):  
Yanliang Yang ◽  
Jiping Ma ◽  
Xiuquan Jia ◽  
Zhongtian Du ◽  
Ying Duan ◽  
...  
Keyword(s):  
Aqueous Phase ◽  
Alkaline Earth ◽  
Earth Metal ◽  
High Yield ◽  
Alkaline Earth Metal

Furfural was converted to tetrahydrofurfuryl alcohol with high yield in water on alkaline earth metal modified Ni/Al2O3.

Chemical transformation of inherent sodium and calcium species during direct liquefaction of two typical lignites rich in alkali and alkaline earth metals

Fuel ◽  
2017 ◽  
Vol 210 ◽  
pp. 227-235 ◽  
Author(s):  
Xiao Li ◽  
Jing-Pei Cao ◽  
Xianliang Meng ◽  
Ruizhi Chu ◽  
Guoguang Wu ◽  
...  
Keyword(s):  
Chemical Transformation ◽  
Alkaline Earth ◽  
Alkaline Earth Metals ◽  
Direct Liquefaction
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