http://nopr.niscpr.res.in/handle/123456789/22618 2026-10-10T10:46:52Z http://nopr.niscpr.res.in/handle/123456789/22876 Title: Effect of heating rate on the char yield and pore structure of chars prepared from viscose rayon cloth Authors: Kumar, K; Saxena, R K; Sarkar, A K Abstract: Characteristics of the char prepared from viscose rayon cloth has been studied. Effect of heating rate in different temperature zones has been investigated. Rate of weight loss of the pretreated viscose rayon cloth varies with time throughout the temperature zone. Page(s): 149-152 2001-03-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/22875 Title: Synthesis and characterization of monomeric and polymeric dyes Authors: Maradiya, Hari R; Patel, Vithal S Abstract: Monomeric dyes have been synthesized by the diazotization of 2-amino-3,5-bis (ethoxycarbonyl)-4-methylthiophene and coupled with various substituted <i>N</i>-arylmaleimides. The polymeric dyes have been derived from monomeric dyes by the free radical addition polymerization. The polymeric dyes are characterized by intrinsic viscosity, molecular weight by VPO and thermogravimetry. Monomeric and polymeric dyes also have been characterized by their IR spectra and elemental analysis. All the dyes are applied on nylon and polyester fibres as a disperse dye and their dyeing properties are studied. Page(s): 140-148 2001-03-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/22874 Title: Basic dyes removal from wastewater by adsorption on rice husk carbon Authors: Singh, D K; Srivastava, Bhavana Abstract: Rice husk carbon (RHC) has been prepared from rice husk impregnated with 50% H₃PO₄ and carbonised at 300°C. Its adsorption capacity has been tested for the decolourization of wastewater containing safranine and methylene blue. The effect of system variables such as concentration, temperature, <i>p</i>H, contact time, adsorbent dosage and particle size are investigated. Removal of dye has been found to increase with increase in dye concentration and <i>p</i>H of the solution. Kinetics of removal has been found to follow the first order rate expression. The adsorption isotherm data fitted both Freundlich and Langmuir adsorption isotherms. Thermodynamic studies show the adsorption to be an exothermic and spontaneous. Page(s): 133-139 2001-03-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/22873 Title: Kinetics and process parameter studies in the synthesis of <i>2</i>-amino-<i>1</i>-butanol from methyl<i>-DL-α</i>-aminobutyrate Authors: Mukhopadhyay, Sudip; Chandalia, Sampatraj B Abstract: Methyl-<i>DL-α</i>-aminobutyrate was hydrogenated in methanol at 105 atm hydrogen partial pressure and 170°C temperature over copper chromite catalyst in a high pressure autoclave to obtain <i>2</i>-amino-<i>1</i>-butanol. Under best suitable reaction conditions, 100% selectivity was obtained at an ester conversion of 39%. Different important process parameters like temperature, catalyst loading, catalyst reusability, initial concentration, speed of agitation, and hydrogen partial pressure were studied. The reaction was found to be a first order reaction on the starting ester under the reaction conditions. Page(s): 128-132 2001-03-01T00:00:00Z