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R P Singh - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis and flocculation characteristics of a novel biodegradable Flocculating Agent amylopectin-g-poly(acrylamide-co-N-methylacrylamide)
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2015
    Co-Authors: Dinabandhu Sasmal, R P Singh, Tridib Tripathy
    Abstract:

    Abstract Amylopectin-g-poly(acrylamide-co- N -methylacrlymide) [AP-g-poly(AM-co-NMA)] was prepared in presence of potassium persulfate (K 2 S 2 O 8 ) as the initiator by solution polymerization technique. The synthesised graft copolymer was characterized by various characterization techniques like FTIR, 1 H NMR and 13 C NMR spectroscopy, thermal analysis and SEM. Biodegradation of the graft copolymers was carried out by enzyme hydrolysis. Flocculation performance of the graft copolymer was evaluated in 1.0 wt% coal, 1.0 wt% silica, 1.0 wt% kaolin, 0.25 wt% iron ore and 1.0 wt% bentonite clay suspensions. The flocculation efficiency of the graft copolymer was also evaluated by the colour removal capacity from aqueous solution of a synthetic dye, malachite green. A comparative study of the flocculation performance AP-g-poly(AM-co-NMA) was also made with another laboratory synthesised graft copolymer namely amylopectin-g-polyacrylamide (AP-g-PAM) and some commercially available flocculants in the same suspensions and also in the malachite green solution. The results showed that the graft copolymer AP-g-poly(AM-co-NMA) showed better flocculation performance than that of AP-g-PAM as well as to some of the commercial Flocculating Agents.

  • Characterization of cationic starch: An efficient Flocculating Agent
    Journal of Applied Polymer Science, 2008
    Co-Authors: R P Singh
    Abstract:

    Starch is a known carbohydrate in which, regardless of its origin, two polysaccharides are found namely amylose and amylopectin. By insertion of a cationic moiety to the backbone of starch, a modified cationic starch can be developed which can be used as flocculant. Various grades of cationic starches were developed to optimize the best performing flocculant. The base polysaccharide, starch and the best performing cationic starch i.e., Cat St3 (which have been confirmed from flocculation characteristics and intrinsic viscosity measurement) have been characterized by various characterization techniques such as determination of molecular weight, elemental analysis, FTIR spectroscopy, intrinsic viscosity measurement, thermal analysis, etc. From the characterization, it could be concluded that there was a substantial incorporation of cationic moiety onto the backbone of starch. The flocculation efficacy of these cationized starches was compared with each other and with some of the commercial flocculants available in national and international market in manganese ore suspensions. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

  • synthesis and characterization of cationic guar gum a high performance Flocculating Agent
    Journal of Applied Polymer Science, 2007
    Co-Authors: R P Singh
    Abstract:

    Among various water-soluble polysaccharides, guar gum is one of the most important polysaccharide, which is having a wide variety of applications. By grafting a cationic moiety onto the backbone of guar gum, a modified naturally occurring polysaccharide can be developed, which used to be use as high performance Flocculating Agent and viscosifier (Singh et al.).15 Various grades of cationic guar gums have been synthesized by varying the synthesis parameters. All these polysaccharides have been characterized by various characterization techniques, such as elemental analysis, FTIR spectroscopy, intrinsic viscosity measurement, molecular weight determination, thermal analysis, and X-ray diffraction analysis. From all of these characterization studies, it has been confirmed that the cationic moiety has been grafted onto the backbone of polysaccharide. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007

  • cationic starch an effective Flocculating Agent
    Carbohydrate Polymers, 2005
    Co-Authors: R P Singh
    Abstract:

    A series of cationic starches (Cat St) have been developed by incorporating a cationic moiety N-(3-Chloro-2-hydroxypropyl) trimethyl ammonium chloride (CHPTAC) onto the backbone of starch in presence of NaOH. The cationic starches are characterized by elemental analysis, FTIR spectroscopy and intrinsic viscosity measurement. The flocculation characteristics of these starches have been evaluated in 0.25 wt% silica suspension by jar test. It has been found that among the four cationic starches, the one with longer CHPTAC chains shows the best performance. The flocculation characteristics of this starch are on silica suspensions compared with various commercially available flocculants.

  • high performance Flocculating Agent based on partially hydrolysed sodium alginate g polyacrylamide
    European Polymer Journal, 2000
    Co-Authors: Tridib Tripathy, R P Singh
    Abstract:

    Abstract The partial hydrolysis of the sodium alginate–g–polyacrylamide was carried out in alkaline medium. Four grades of partially hydrolysed products were synthesized by varying the reaction parameters. The neutralization equivalent of these products was determined by titrating with standard sodium hydroxide solution. Flocculation characteristics of all the hydrolysed graft copolymers and the unhydrolysed sodium alginate–g–polyacrylamide were determined in 10 wt% iron ore suspensions. The partially hydrolysed product with neutralization equivalent of 2865 gm shows better performance than other partially hydrolysed as well as unhydrolysed products in flocculation. The flocculation performance of the above best performing product was also compared with two commercially available flocculants Rishfloc-440 and Magnafloc-1011, as well as with one flocculant developed in our laboratory (amylopectin–g–polyacrylamide) in 10 wt% iron ore suspension. Here also it was found that the polymer with neutralization equivalent 2865 gm shows better performance than others.

Tridib Tripathy - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis and flocculation characteristics of a novel biodegradable Flocculating Agent amylopectin-g-poly(acrylamide-co-N-methylacrylamide)
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2015
    Co-Authors: Dinabandhu Sasmal, R P Singh, Tridib Tripathy
    Abstract:

    Abstract Amylopectin-g-poly(acrylamide-co- N -methylacrlymide) [AP-g-poly(AM-co-NMA)] was prepared in presence of potassium persulfate (K 2 S 2 O 8 ) as the initiator by solution polymerization technique. The synthesised graft copolymer was characterized by various characterization techniques like FTIR, 1 H NMR and 13 C NMR spectroscopy, thermal analysis and SEM. Biodegradation of the graft copolymers was carried out by enzyme hydrolysis. Flocculation performance of the graft copolymer was evaluated in 1.0 wt% coal, 1.0 wt% silica, 1.0 wt% kaolin, 0.25 wt% iron ore and 1.0 wt% bentonite clay suspensions. The flocculation efficiency of the graft copolymer was also evaluated by the colour removal capacity from aqueous solution of a synthetic dye, malachite green. A comparative study of the flocculation performance AP-g-poly(AM-co-NMA) was also made with another laboratory synthesised graft copolymer namely amylopectin-g-polyacrylamide (AP-g-PAM) and some commercially available flocculants in the same suspensions and also in the malachite green solution. The results showed that the graft copolymer AP-g-poly(AM-co-NMA) showed better flocculation performance than that of AP-g-PAM as well as to some of the commercial Flocculating Agents.

  • high performance Flocculating Agent based on partially hydrolysed sodium alginate g polyacrylamide
    European Polymer Journal, 2000
    Co-Authors: Tridib Tripathy, R P Singh
    Abstract:

    Abstract The partial hydrolysis of the sodium alginate–g–polyacrylamide was carried out in alkaline medium. Four grades of partially hydrolysed products were synthesized by varying the reaction parameters. The neutralization equivalent of these products was determined by titrating with standard sodium hydroxide solution. Flocculation characteristics of all the hydrolysed graft copolymers and the unhydrolysed sodium alginate–g–polyacrylamide were determined in 10 wt% iron ore suspensions. The partially hydrolysed product with neutralization equivalent of 2865 gm shows better performance than other partially hydrolysed as well as unhydrolysed products in flocculation. The flocculation performance of the above best performing product was also compared with two commercially available flocculants Rishfloc-440 and Magnafloc-1011, as well as with one flocculant developed in our laboratory (amylopectin–g–polyacrylamide) in 10 wt% iron ore suspension. Here also it was found that the polymer with neutralization equivalent 2865 gm shows better performance than others.

  • novel Flocculating Agent based on sodium alginate and acrylamide
    European Polymer Journal, 1999
    Co-Authors: Tridib Tripathy, S R Pandey, N C Karmakar, R P Bhagat, R P Singh
    Abstract:

    Abstract Graft copolymers of sodium alginate with polyacrylamide were synthesized using a ceric ion initiated solution polymerization technique at 27±1°C. Six graft copolymers have been synthesized with a variation in the number and length of grafted polyacrylamide chains. The graft copolymers have been characterized by viscometry, IR spectroscopy, SEM and XRD study. Their flocculation characteristics were evaluated in 0.25 wt% kaolin and 10 wt% iron ore suspensions. The flocculation behaviour of one of the above grades has been studied on a 1 wt% coal suspension. The flocculation characteristics of these grafted polymers were also compared with various commercially available polymeric flocculants. Among the grafted alginates, it was observed that, the graft copolymers containing longer polyacrylamide chains were the most efficient.

R P Bhagat - One of the best experts on this subject based on the ideXlab platform.

  • novel Flocculating Agent based on sodium alginate and acrylamide
    European Polymer Journal, 1999
    Co-Authors: Tridib Tripathy, S R Pandey, N C Karmakar, R P Bhagat, R P Singh
    Abstract:

    Abstract Graft copolymers of sodium alginate with polyacrylamide were synthesized using a ceric ion initiated solution polymerization technique at 27±1°C. Six graft copolymers have been synthesized with a variation in the number and length of grafted polyacrylamide chains. The graft copolymers have been characterized by viscometry, IR spectroscopy, SEM and XRD study. Their flocculation characteristics were evaluated in 0.25 wt% kaolin and 10 wt% iron ore suspensions. The flocculation behaviour of one of the above grades has been studied on a 1 wt% coal suspension. The flocculation characteristics of these grafted polymers were also compared with various commercially available polymeric flocculants. Among the grafted alginates, it was observed that, the graft copolymers containing longer polyacrylamide chains were the most efficient.

S R Pandey - One of the best experts on this subject based on the ideXlab platform.

  • novel Flocculating Agent based on sodium alginate and acrylamide
    European Polymer Journal, 1999
    Co-Authors: Tridib Tripathy, S R Pandey, N C Karmakar, R P Bhagat, R P Singh
    Abstract:

    Abstract Graft copolymers of sodium alginate with polyacrylamide were synthesized using a ceric ion initiated solution polymerization technique at 27±1°C. Six graft copolymers have been synthesized with a variation in the number and length of grafted polyacrylamide chains. The graft copolymers have been characterized by viscometry, IR spectroscopy, SEM and XRD study. Their flocculation characteristics were evaluated in 0.25 wt% kaolin and 10 wt% iron ore suspensions. The flocculation behaviour of one of the above grades has been studied on a 1 wt% coal suspension. The flocculation characteristics of these grafted polymers were also compared with various commercially available polymeric flocculants. Among the grafted alginates, it was observed that, the graft copolymers containing longer polyacrylamide chains were the most efficient.

N C Karmakar - One of the best experts on this subject based on the ideXlab platform.

  • Grafted hydroxypropyl guargum: Development, characterization and application as Flocculating Agent
    Bulletin of Materials Science, 2002
    Co-Authors: B. R. Nayak, N C Karmakar, Dipti Biswal, Raj Pal Singh
    Abstract:

    Synthesis of hydroxypropyl guargum-g-polyacrylamide was carried out by ceric ion induced redox polymerization technique at 28±1°C. The graft copolymer was characterized by IR and thermal analysis. The flocculation performance of graft copolymer was tested in 1 wt% coal suspension.

  • novel Flocculating Agent based on sodium alginate and acrylamide
    European Polymer Journal, 1999
    Co-Authors: Tridib Tripathy, S R Pandey, N C Karmakar, R P Bhagat, R P Singh
    Abstract:

    Abstract Graft copolymers of sodium alginate with polyacrylamide were synthesized using a ceric ion initiated solution polymerization technique at 27±1°C. Six graft copolymers have been synthesized with a variation in the number and length of grafted polyacrylamide chains. The graft copolymers have been characterized by viscometry, IR spectroscopy, SEM and XRD study. Their flocculation characteristics were evaluated in 0.25 wt% kaolin and 10 wt% iron ore suspensions. The flocculation behaviour of one of the above grades has been studied on a 1 wt% coal suspension. The flocculation characteristics of these grafted polymers were also compared with various commercially available polymeric flocculants. Among the grafted alginates, it was observed that, the graft copolymers containing longer polyacrylamide chains were the most efficient.