NOPR Collection:

Effect of interaction of commercial and nano size CaSO₄ filler on mechanical and thermal properties of polyurethane foam

Sat, 01 Jul 2006 00:00:00 GMT

Title: Effect of interaction of commercial and nano size CaSO₄ filler on mechanical and thermal properties of polyurethane foam Authors: Mishra, S; Mukherji, Arindam Abstract: Composite foams were prepared by adding different concentration (0.5-2.5 wt%) of commercial and nano size CaSO₄ filler in a single-phase polyurethane matrix. The differential Scanning Calorimeter (DSC) for composite as well as pure polyurethane was done to ascertain the degree of interaction of filler with the structure of matrix as active sites or strong interaction with the matrix. The degree of cell formation increases on increase in amount of nano filler in the composites whereas decreases in case of micron size filler in composites. The increment in specific gravity for nano size filler (0.17-0.3 g/cc) and in case of micron size filler (0.17-0.23 g/cc) makes a strong support for the increment of cell numbers. The significant enhancement (300%) in mechanical properties, compressive strength, and the optical and transmission electron micrographs (TEM) of the cell sizes also satisfies the DSC results. The decrement in amount of heat (∆H cal/g), in case of commercial size filler for curing, shows the conduction of heat is more due to formation of cells (less in numbers) that results in reduction of rate of heating. On increasing the amount of filler in composites, specific gravity increases more in case of nano size in composites rather commercial size filler. Thermal Gravimetric Analyzer (TGA) shows increment in degradation temperature in case of nano size filler. Increment of flammability for nano size filler (4.7-10.61 s/mm) and in case of commercial size filler (4.7-6.15 s/rnm), shows that the incorporation of nano particles not only improves the degradation behavior but also retards the inflammable time. Page(s): 582-589

Process strategies for cephalosporin C fermentation

Sat, 01 Jul 2006 00:00:00 GMT

Title: Process strategies for cephalosporin C fermentation Authors: Srivastava, Pradeep; Mishra, Punita; Kundu, Subir Abstract: Cephalosporin C (CPC), a β-lactam antibiotic, is starting molecule for industrial production of semi synthetic cephalosporins. CPC fermentation has been carried out in Air Lift Reactor (indigenously made up of borosilicate glass) in different fermentation modes i.e., batch and fed batch modes using a mold Acremonium chrysogenum (synn. Cephalosporium acremonium). A definite correlation exists between the antibiotic productivity and flow rate of supplementary feed. Fed batch process was shown to be more efficient than the batch one, and the process in which the lowest supplementary feed flow rate was used resulted in significantly higher antibiotic production. Page(s): 599-602

Iron oxidation studies with immobilized cells of Acidithiobacillus ferrooxidans

Sat, 01 Jul 2006 00:00:00 GMT

Title: Iron oxidation studies with immobilized cells of Acidithiobacillus ferrooxidans Authors: Das, Trupti; Chaudhury, Gautam Roy Abstract: Biooxidation of iron is considered to be one of the major steps in various industrial processes like the bioleaching of low-grade sulfide ores and desulfurisation of coal. The eco-friendly phenomenon is also widely exploited for the treatment of acid mine drainage and removal of hydrogen sulfide from gaseous effluents. In the present work, iron oxidation in batch as well as continuous mode has been studied using immobilized Acidithiobacillus ferrooxidans. Enhanced oxidation rate is achieved in a continuous mode in the column reactor and the immobilized cells are found to be very effective for the oxidation studies. Page(s): 594-598

Artificial neural network for solving paper industry problems: A review

Sat, 01 Jul 2006 00:00:00 GMT

Title: Artificial neural network for solving paper industry problems: A review Authors: Rajesh, Kumar; Ray, A K Abstract: The review focuses on applications of artificial neural networks (ANNs) in various subsystems of pulp and paper making processes. Some applications are pertinent to modeling of pulping, bleaching and energy conservation process while others are related to control of refining, washing of brown stock, combustion of black liquor, lime kiln operation, grade changes and quality control. A general algorithm is also developed to demonstrate how to solve the complex problem using ANN for paper mill subsystems. Page(s): 565-573

NOPR Collection:

Effect of interaction of commercial and nano size CaSO4 filler on mechanical and thermal properties of polyurethane foam

Process strategies for cephalosporin C fermentation

Iron oxidation studies with immobilized cells of Acidithiobacillus ferrooxidans

Artificial neural network for solving paper industry problems: A review

Effect of interaction of commercial and nano size CaSO₄ filler on mechanical and thermal properties of polyurethane foam