http://nopr.niscpr.res.in/handle/123456789/22610 2026-10-10T02:23:26Z http://nopr.niscpr.res.in/handle/123456789/22754 Title: Raoul-Pierre Pictet—The liquefaction of oxygen and achievement of low temperatures Authors: Wisniak, Jaime Abstract: To Raoul Pictet (1846-1929) we owe the realization of the liquefaction of oxygen and the study of the effect of low temperatures on physical, chemical, and physiological phenomena. He developed Trouton's law in a theoretical manner, years before Trouton did it by sample tabular means. The priority of oxygen liquefaction was and continues to be a matter of discussion. Page(s): 326-336 2003-05-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/22753 Title: Selective esterification of triethylene glycol with methacrylic acid using methane sulphonic acid Authors: Notay, J S; Dahiwale, S M; Bhagade, S S Abstract: The esterification of tri-ethylene glycol with methacrylic acid under identical conditions of catalyst concentration, for synthesis of tri-ethylene glycol di-methacrylate using sulphuric acid and methane sulphonic acid as catalyst is discussed. The reaction by-products are lesser in case of methane sulphonic acid catalyst, in comparison to sulphuric acid catalyst. Therefore the yield of ester product, tri-ethylene glycol di-methacrylate, achieved during the synthesis is higher with the use of methane sulphonic acid as a catalyst, than on use of sulphuric acid as catalyst. This concludes that methane sulphonic acid has better catalyst selectivity in comparison to sulphuric acid, for the synthesis of tri-ethylene glycol di- methacrylate. Methane sulphonic acid when neutralized is easily bio-degradable which is also desirable from environmental point of view. Page(s): 324-325 2003-05-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/22752 Title: Thermal analysis of tri-ethylene glycol di-methacrylate Authors: Notay, J S; Dahiwale, S M; Pradhan, S D Abstract: Thermal characterization of tri-ethylene glycol dimethacrylate was carried out in view of its vast applications. The main objective of this paper is to investigate the thermal behaviour of the impurities present in the compound triethylene glycol di-methacrylate and its effects during applications of the compound. Thermal characterisation was carried out under two different experimental conditions. One at low heat flux rate of 10°C/min, and another at higher heat flux rate of 100°C/min. At low heat flux rate, the ethers present as impurities in the compound tri-ethylene glycol dimethacrylate are stable below the temperature of 150°C. This is desirable for applications in anaerobic adhesive and optical articles where exposure to temperature beyond 150°C is not required. At higher heating rate of 100°C/min, the endothermic decomposition of the impurities as ethers present in the compound tri-ethylene glycol di-methacrylate is observed, and the same is desired from the application point of view of using tri-ethylene glycol di-methacrylate as a moderant in single base propellants.   Page(s): 321-323 2003-05-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/22751 Title: Mass transfer analysis of the extraction of Nickel(II) by emulsion liquid membrane Authors: Chakraborty, Mousumi; Bhattacharya, Chiranjib; Datta, Siddhartha Abstract: A mathematical model for batch extraction of Nickei(II) with emulsion liquid membrane (ELM) from a dilute sulphate solution and from industrial wastewater, using di-(2-ethylhexyl) phosphoric acid (D2EHPA) as extractant and hydrochloric acid as stripping agent is reported. The model considers a reaction front within the emulsion globule and assumes an instantaneous and irreversible reaction between the solute and the internal reagent at the membrane internal droplet interface. Batch experiments are performed for separation of Nickel(II) from aqueous sulphate solution of initial concentration in the range of 100-75 mg/L. The influence of Nickei(II) concentration on the distribution coefficient at pH 3.5 is co-related by a semiempirical model, which has been used for simulation of the extraction process. The simulated curves are found to be in good agreement with the experimental data. Page(s): 311-320 2003-05-01T00:00:00Z