Sökning: "lignin reaktivitet"

Hittade 3 uppsatser innehållade orden lignin reaktivitet.

  1. 1. Lignin modification for higher reactivity towards epoxides

    Master-uppsats, KTH/Fiber- och polymerteknologi

    Författare :Filip Rynkiewicz; [2023]
    Nyckelord :Lignin; modification; reactivity; epoxide; oxidation; Lignin; modifikation; reaktivitet; epoxid; oxidation;

    Sammanfattning : Fem metoder har använts för att modifiera barrvedslignin med syftet att öka reaktiviteten av ligninet mot epoxidgrupper. Ligninprover analyserades med NMR och FTIR medan reaktivitet var mätt genom reometri. Metoder som ökade mängden karboxylsyragrupper på ligninet minskade ligninets reaktivitet. LÄS MER

  3. 2. Development of Kraft Lignin and Coating Technique to Prepare Coated Urea Fertilisers with Increased Nutrient Use Efficiency

    Master-uppsats, KTH/Skolan för kemivetenskap (CHE)

    Författare :Xueyan Xu; [2017]
    Nyckelord :fertilizer coating; lignin; modified lignin; polylactide; slow release; ytbeläggning för gödningsmedel; lignin; modifierad lignin; polylaktid; kontrollerad frisättning;

    Sammanfattning : Coating urea to prepare controlled release N-fertilizer has been considered as an effective way to increase its nutrient use efficiency, thus reduce its waste and the consequent harmful environmental impacts. Inorganic sulphur and synthetic polymers have been used in the industry as coating materials together with utilization of various types of expensive coating equipment which commonly requires also complicated technical setup and controls. LÄS MER

  4. 3. Chemical methods to increase the reactivity  of lignin : In the context of green chemistry  and education for sustainable development

    Uppsats för yrkesexamina på avancerad nivå, KTH/Skolan för teknikvetenskaplig kommunikation och lärande (ECE)

    Författare :Erica Birgersson; [2015]
    Nyckelord :Biomaterial; lignin reactivity; thiol mediated demethylation; iodine mediated demethylation; green chemistry; SNl-fall.; Biomaterial; lignin reaktivitet; tiol medierad demetylering; jod medierad demetylering; gron kemi; SNI-fall;

    Sammanfattning : The research  concerning lignin in high value applications has increased  during the last years due to its renewability and availability in the black liquor from pulp mills. Today  the major part of kraft lignin found  in the black liquor is used as fuel to gain energy  in the recovery boiler. LÄS MER