Selective isolation of nitrogen bases from petroleum

1983 ◽  
Vol 55 (11) ◽  
pp. 1685-1688 ◽  
Author(s):  
Jean Marie. Schmitter ◽  
Ioannis. Ignatiadis ◽  
Patrick. Arpino ◽  
Georges. Guiochon
Keyword(s):  
Selective Isolation ◽  
Nitrogen Bases

A method for selective separation of scandium (III) from yttrium and a number of rare-earth elements for its subsequent determination

2018 ◽  
Vol 84 (11) ◽  
pp. 23-27
Author(s):  
M. I. Degtev ◽  
A. A. Yuminova ◽  
A. S. Maksimov ◽  
A. P. Medvedev
Keyword(s):  
Rare Earth ◽  
Aqueous Phase ◽  
Selective Isolation ◽  
Optimum Ratio ◽  
Extraction Condition ◽  
Sulfosalicylic Acid ◽  
Salting Out ◽  
Subsequent Determination ◽  
Toxic Organic Solvents ◽  
Metal Ions Extraction

The possibility of using an aqueous stratified system of antipyrine — sulfosalicylic acid — water for the selective isolation of scandium macro- and microquantities for subsequent determination is studied. The proposed extraction system eliminates the usage of toxic organic solvents. The organic phase with a volume of 1.2 to 2.0 ml, resulting from delamination of the aqueous phase containing antipyrine and sulfosalicylic acid is analysed to assess the possibility of using such systems for metal ions extraction. Condition necessary for the formation of such a phase were specified: the ratio of the initial components, their concentration, presence of inorganic salting out agents. The optimum ratio of antipyrine to sulfosalicylic acid is 2:1 at concentrations of 0.6 and 0.3 mol/liter in a volume of the aqueous phase of 10 ml. The obtained phase which consists of antipyrinium sulfosalicylate, free antipyrine and water, quantitatively extracts macro- and microquantities of scandium at pH = 1.54. Macro- and microquantities of yttrium, terbium, lanthanum, ytterbium and gadolinium are not extracted under the aforementioned conditions thus providing selective isolation of scandium from the bases containing yttrium, ytterbium, terbium, lanthanum, and gadolinium.

SELECTIVE ISOLATION OF HUMAN X-BEARING SPERM BY DIFFERENTIAL VELOCITY SEDIMENTATION IN PERCOLL DENSITY GRADIENTS

1984 ◽  
Vol 5 (2) ◽  
pp. 187-194 ◽  
Author(s):  
SATORU KANEKO ◽  
SHIGERU OSHIO ◽  
TOSHIFUMI KOBAYASHI ◽  
HIDEO MOHRI ◽  
RIHACHI IIZUKA
Keyword(s):  
Velocity Sedimentation ◽  
Density Gradients ◽  
Selective Isolation
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