NOPR Collection:

The History of Fluorine — From discovery to commodity

Mon, 01 Jul 2002 00:00:00 GMT

Title: The History of Fluorine — From discovery to commodity Authors: Wisniak, Jaime Abstract: Fluorine was the last of the halogens to be isolated. The extreme difficulties and dangers of handling it retarded substantial commercial applications until World War II when it became essential for the development of nuclear devices. Development of industrial processes for the manufacture of hydrogen fluoride and chlorofluorinated hydrocarbons turned Duorine and its derivatives into a major chemical commodity. The end use pattern of fluorine has reflected the changes in social appreciation of environmental protection and safety. Page(s): 363-372

Study of analgesic activity of some novel 1- (9’-Acridinyl)-5-substituted phenyltetrazoles

Mon, 01 Jul 2002 00:00:00 GMT

Title: Study of analgesic activity of some novel 1- (9’-Acridinyl)-5-substituted phenyltetrazoles Authors: Kavitha, Helen P; Balasubramanian, N Abstract: Tetrazole and acridine derivatives are well known biologically active compounds by themselves. This paper deals with the analgesic activity of some novel tetrazole derivatives containing acridine ring. The results of the study indicate that the newly synthesized tetrazole derivatives show fairly good analgesic activity. Page(s): 361-362

Anodic dissolution and passivation of binary alloys-An overview

Mon, 01 Jul 2002 00:00:00 GMT

Title: Anodic dissolution and passivation of binary alloys-An overview Authors: Mathiyarasu, J; Palaniswamy, N; Muralidharan, V S Abstract: The dissolution of a metal occurs with the transfer of one or more electrons. The dissolution depends on potential, which may or may not result in passivation. In the case of dissolution of binary alloys, the dissolution may be selective for the less noble metal or simultaneous dissolution may occur. The passivation and depassivation processes on the alloy surface depend on the electrode potential and anions present in the medium. The depassivation may be uniform or with film breakdown at selected sites. Page(s): 350-360

Modelling and simulation of extraction behaviour of n-butyraldehyde in 30%TBP/n-dodecane purex biphasic system

Mon, 01 Jul 2002 00:00:00 GMT

Title: Modelling and simulation of extraction behaviour of n-butyraldehyde in 30%TBP/n-dodecane purex biphasic system Authors: Kumar, Shekhar; Koganti, S B Abstract: Use of butyraldehyde for selective reduction of Neptunium has been reported earlier. As there is no model available to account for its extraction behaviour in the conventional purex system, the reported experimental results could be explained only on the qualitative basis. The reported data were analyzed to determine its solvation number and an empirical model was developed for estimation of its distribution coefficients under purex conditions. The reported counter-current extraction run in mixer-settlers was also computer simulated using an in-house developed purex code SIMPSEX. The simulated profiles were compared with the experimental stage profiles and a satisfactory agreement was observed. Page(s): 346-349