scholarly journals On the Determination of the Diffusivity of CO 2 in Aqueous and NonAqueous Solvents: Investigations with Laminar Jets and Wetted Wall Columns

2002 ◽  
Vol 189 (8) ◽  
pp. 1009-1037 ◽  
Author(s):  
J. A. Hogendoorn ◽  
R. D. Vas Bhat ◽  
G. F. Versteeg
Keyword(s):  
Nonaqueous Solvents ◽  
Laminar Jets

Titrimetric Determination of N,N′-Disubstituted p-Phenylenediamines

1962 ◽  
Vol 35 (3) ◽  
pp. 676-683 ◽  
Author(s):  
Otto Lorenz ◽  
C. R. Parks
Keyword(s):  
Rapid Detection ◽  
Spot Test ◽  
Nonaqueous Solvents ◽  
Oxidation Products ◽  
Colorimetric Determination ◽  
Titration Curves ◽  
Rubber Compounds ◽  
Titrimetric Determination

Abstract Three types of p-phenylenediamine derivatives used extensively as antioxidants and antiozonants in rubber compounds are N,N′-di-sec-alkyl-, N-sec-alkyl-N′-aryl-, and N,N′-diaryl-p-phenylenediamines. Available methods for these compounds are based mainly on a colorimetric determination of their colored oxidation products, the Wurster's salts or the p-quinonediimines. The deep coloration of the Wurster's salts was used as the basis of a spot test for the rapid detection of these diamines in rubber compounds. This test permits one to differentiate the three types of p-phenylenediamines. An investigation of the neutralization of p-phenylenediamines in nonaqueous solvents showed that N,N′-di-sec-alkyl- and N-sec-alkyl-N′-aryl-p-phenylenediamines could be determined readily in this way. The N,N′-diaryl derivatives did not give satisfactory titration curves because of their low basicity. By the addition of chloranil, however, diaryl-p-phenylenediamines were oxidized to the Wurster's salts with the formation of one equivalent of base which could be neutralized by acid. A similar procedure was applicable to the determination of N,N′-diaryl-p-quinonediimines, or mixtures of these diamines and diimines.

Determination of stability constants of cesium [2]-cryptand complexes in nonaqueous solvents by cesium-133 NMR

1977 ◽  
Vol 6 (11) ◽  
pp. 771-778 ◽  
Author(s):  
Elizabeth Mei ◽  
Lulu Liu ◽  
James L. Dye ◽  
Alexander I. Popov
Keyword(s):  
Stability Constants ◽  
Nonaqueous Solvents

Rapid Polarographic Determination of Uranium in Nonaqueous Solvents

1956 ◽  
Vol 28 (8) ◽  
pp. 1285-1288 ◽  
Author(s):  
D. J. Fisher ◽  
P. F. Thomason
Keyword(s):  
Nonaqueous Solvents ◽  
Polarographic Determination

Iodimetric determination of triphenylantimony using nonaqueous solvents

1975 ◽  
Vol 63 (5-6) ◽  
pp. 627-631 ◽  
Author(s):  
Sarvinder Singh Pahil ◽  
Sarjit Singh Sandhu ◽  
Krishan Dev Sharma
Keyword(s):  
Nonaqueous Solvents
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