NOPR Collection:

Comparative Evaluation of the Effect of Butylated and Isobutylated Derivatives of M-F Resins on Wood-finish Properties

Thu, 01 Feb 2001 00:00:00 GMT

Title: Comparative Evaluation of the Effect of Butylated and Isobutylated Derivatives of M-F Resins on Wood-finish Properties Authors: Sarma, Biswajit; Dolui, Swapan K; Sharma, Ashok K Abstract: The effect of butylated and isobutylated derivatives of melamine-formaldehyde (M-F) resins in an acid-catalysed lacquer formulation on wood finish properties is compared by determining the finish properties such as drying time, shelf-life, resistance towards different chemicals, hardness and impact resistance. Results are discussed in detail. Page(s): 153-158

Study of Dyes Used in Fake and Adulterated Petrol Samples

Thu, 01 Feb 2001 00:00:00 GMT

Title: Study of Dyes Used in Fake and Adulterated Petrol Samples Authors: Malve, M K; Krishnamurthy, R; Shinde, B M Abstract: The study deals with dyes from petrol, fake petrol, green petrol or patrex and adulteration of these fuels with blue kerosene. A High Performance Thin Layer Chromatography (HPTLC) study of above fuels indicates the difference in dye properties compared to that of genuine petrol. Also dye from blue kerosene was detected in few petrol samples and patrex samples, indicating adulteration of blue kerosene in above fuels. In addition to dye study, other tests like density and distillation characteristics for petrol, Raxon, SBP and green petrol have also been studied. Page(s): 151-152

Effect of NTA and pH on Lead(II) Adsorption by the Hydrous Oxides of Mn, Fe, and A1

Thu, 01 Feb 2001 00:00:00 GMT

Title: Effect of NTA and pH on Lead(II) Adsorption by the Hydrous Oxides of Mn, Fe, and A1 Authors: Abraham, Beena T; Anirudhan, T S Abstract: The object of this work was to study the influence of nitrilotriacetic acid (NTA) on Pb(II) adsorption by different hydrous oxide gels (MnOOH, FeOOH and AlOOH) at different pH levels. The surface charge density as a function of pH in aqueous solution of NaNO₃, NTA and Pb-NTA has been determined. In the presence of NTA the values of zero point charge (pH_zpc) for AlOOH, FeOOH and MnOOH were shifted downwards from 9.2 to 8.5, 7.3 to 6.5 and 3.8 to 3.6 respectively. The pH_zpc values for AlOOH, FeOOH and MnOOH in the presence of Pb and NTA were found to be 7.3, 6.0, and 3.2 respectively. An empirical relationship has been obtained to predict the pH_zpc at any amount of NTA adsorption on AlOOH. The adsorption characteristics of Pb and NTA in presence of each other has been studied. The adsorption of Pb(II) in presence of NTA was greater than NTA adsorption in presence of Pb(II). The maximum adsorption of Pb (II) in presence of NTA occur at a pH range of 3.0-4.0. The oxide surface carries a net positive charge at pH range 3.0-4.0 thus negatively charged Pb-NTA^2- complex can be readily adsorbed. Page(s): 145-150

Assessment of Degree of Carbonisation of Industrial Cokes/Chars with CV:FC Ratio

Thu, 01 Feb 2001 00:00:00 GMT

Title: Assessment of Degree of Carbonisation of Industrial Cokes/Chars with CV:FC Ratio Authors: Rao, K S; Kamavisdar, A; Jalgaonkar, R D; Sirociya, R S; Khanwalkar, S R; Meshram, R M; Sahay, R K Abstract: The degree of coking or completeness of carbonisation in the production of industrial cokes/ chars is assessed with the help of appropriately corrected percentage value of residual volatile matter. Although coke reflectance has good correlation with final carbonisation temperature, its determination is time consuming. As CV:FC ratio has been shown to ascertain the degree of devolatilisation in heat altered coals, as well as in laboratory prepared cokes/chars it is worthwhile to consider its utility for assessing the degree of carbonisation in industrial coking practice too. Studies conducted on a range of industrial cokes/chars reveal that CV:FC ratio :(i) is directly related to residual volatile matter percentage, (ii) can differentiate between iso-volatile cokes/chars by assessing respective degree of coking and (iii) can indicate the order of final coking temperature reached even in cokes/chars having widely varying residual volatile matter percentages.It may, therefore, be inferred that CV: FC ratios provide a simple alternative route for assessing final coking temperature of industrial cokes/chars. Page(s): 141-144