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  • 1.
    Bhattacharyya, Shubhankar
    et al.
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.
    Shah, Faiz Ullah
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Chemical Engineering.
    Thermal stability of choline based amino acid ionic liquids2018In: Journal of Molecular Liquids, ISSN 0167-7322, E-ISSN 1873-3166, Vol. 266, p. 597-602Article in journal (Refereed)
    Abstract [en]

    Thermal stability of different choline based amino acid ionic liquids were studied. Both short term as well as long term thermal studies were carried out. Long term thermal studies of all ILs were carried out by isothermal TGA and short term thermal studies were measured by temperature ramped TGA. Isothermal TGA were studied at two different temperatures 100 °C and 150 °C for 500 min. Whereas, short term thermal stability represents as T2%, T5% and T10% which are the temperature at which 2%, 5% and 10% mass loss of ILs were observed. The effect of alkyl side chain on the cation, etherification of the cation as well structural variation of anion on the thermal stability of choline based ILs were investigated. It was observed that thermal characteristics of ILs towards temperature ramped TGA were different compared to isothermal TGA.

  • 2.
    Jonsson, Julia
    Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
    Förslag på riktvärden för sulfathalter i ytvatten2019Independent thesis Basic level (university diploma), 80 credits / 120 HE creditsStudent thesis
    Abstract [sv]

    Detta examensarbete kommer att vara den avslutande delen i mina studier inom samhällsbyggnads-programmet vid Luleå tekniska universitet. Under min verksamhetsförlagda utbildning, på WSP Sverige AB har jag fått arbeta i uppdrag där kunskaper om vattenkemi och biologi har behövts. Syftet med examenarbetet är att undersöka möjliga förslag på riktvärden för sulfathalter i ytvatten. Examensarbetet tog sin början med att formulera frågeställningar att forma arbetet kring. Utifrån frågeställningarna har jag sedan börjat undersöka vilka länder som har riktvärden för sulfathalter implementerat i miljölagstiftningen. Valet var självklart, att hitta ett land med liknande klimat som norra Sverige för att riktvärdena skulle vara relevanta och trovärdiga. Valet blev att undersöka riktvärden i Kanada. Under examensarbetets gång har jag fått lära mig mycket. Till exempel att kunna läsa och ta till mig information om toxikologiska undersökningar och förstå dess relevans. Detta har i sin tur lett till att jag lärt mig nya begrepp som används inom området miljö och vatten. Jag har även fått en inblick över hur komplext och stort arbetet området miljö och vatten är och fått en bra grund att stå på inför kommande utmaningar i mitt framtida yrkesliv.

  • 3.
    Tank, Rekha
    et al.
    Synthetic Chemistry Division, Defence R and D Establishment.
    Pathak, Uma
    Synthetic Chemistry Division, Defence R and D Establishment.
    Vimal, Manorama
    Synthetic Chemistry Division, Defence R and D Establishment.
    Bhattacharyya, Shubhankar
    Synthetic Chemistry Division, Defence R and D Establishment.
    Pandey, Lokesh Kumar
    Synthetic Chemistry Division, Defence R and D Establishment.
    Hydrogen peroxide mediated efficient amidation and esterification of aldehydes: Scope and selectivity2011In: Green Chemistry, ISSN 1463-9262, E-ISSN 1463-9270, Vol. 13, no 12, p. 3350-3354Article in journal (Refereed)
    Abstract [en]

    An efficient method for the amidation and esterification of aldehydes utilizing hydrogen peroxide as an oxidant has been developed. Cyclic amines and primary alcohols selectively reacted with aromatic aldehydes under mild conditions to yield the corresponding amides and esters

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