Sökning: "Cellulose I"

Visar resultat 1 - 5 av 246 avhandlingar innehållade orden Cellulose I.

  1. 1. Molecular-level Simulations of Cellulose Dissolution by Steam and SC-CO2 Explosion

    Detta är en avhandling från Chalmers University of Technology ; University of Borås

    Författare :Faranak Bazooyar; Högskolan i Borås.; [2014]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Resource Recovery; Resursåtervinning; molecular modelling; cellulose; steam explosion; SC-CO2 explosion; Resource Recovery; Steam explosion; Molecular modelling; Cellulose;

    Sammanfattning : Dissolution of cellulose is an important but complicated step in biofuel production fromlignocellulosic materials. Steam and supercritical carbon dioxide (SC-CO2) explosion are two effective methods for dissolution of some lignocellulosic materials. Loading and explosion are the major processes of these methods. LÄS MER

  2. 2. Mercerization and Enzymatic Pretreatment of Cellulose in Dissolving Pulps

    Detta är en avhandling från Karlstad : Karlstads universitet

    Författare :Heléne Almlöf Ambjörnsson; Karlstads universitet.; [2013]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; alkali; carboxymethyl cellulose; cellulose I; cellulose II; cellulose dissolution; degree of substitution; enzymatic treatment; filterability; gel formation; mercerization; multivariate analytical methods; NIR FT Raman spectroscopy; sodium hydroxide; zink oxide; Chemical Engineering; Kemiteknik;

    Sammanfattning : This thesis deals with the preparation of chemically and/or enzymatically modified cellulose. This modification can be either irreversible or reversible. Irreversible modification is used to prepare cellulose derivatives as end products, whereas reversible modification is used to enhance solubility in the preparation of regenerated cellulose. LÄS MER

  3. 3. Experimental study of alkalinisation of cellulose in industrial relevant conditions

    Detta är en avhandling från Umeå : Umeå universitet

    Författare :Diana Carolina Reyes Forsberg; Umeå universitet.; [2018]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Mercerisation; Alkalinisation; Cellulose I; Cellulose II; Alkali cellulose; Viscose; Cellulose ether; Carboxymethylcellulose; Sodium glycolate; Sodium diglycolate; Raman spectroscopy;

    Sammanfattning : Mercerisation of cellulose pulp with a solution of NaOH is the first step of manufacturing cellulose-based value-added products, e.g. viscose fibres and cellulose ethers. During this process, cellulose transforms into a swollen crystalline structure, alkali cellulose (Na-Cell). LÄS MER

  4. 4. Chemical modification of cellulose-new possibilities of some classical routes

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :Merima Hasani; [2010]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Cellulose esters; Cellulose characterization; Cellulose ethers; Cationization; Cellulose nanocrystals; Crosslinking of cellulose;

    Sammanfattning : Owning to its unique structure, along with the inexhaustible renewability, cellulose has been a subject of scientific and commercial interest for over 150 years. However, given attractive structural properties, such as stiffness, hydrophilicity, stereoregularity, potential for chemical modifications and ability to form superstructures, utilization of this biopolymer is far below its potential. LÄS MER

  5. 5. Zygomycetes and cellulose residuals hydrolysis, cultivation and applications

    Detta är en avhandling från University of Borås: School of Engineering ; Chalmers University of Technology: Department of Chemical and Biological Engineering

    Författare :Patrik Lennartsson; Högskolan i Borås.; [2012]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Resource Recovery; Resursåtervinning; zygomycetes; fungi; lignocelluloses; ethanol; fish feed; animal feed; dimorphism; airlift; pretreatment; Biotechnology; Zygomycetes;

    Sammanfattning : Zygomycetes is a class of fungi living worldwide as saprobes, as part of mycorrhizae, and as parasites. Humans have used some zygomycetes for centuries in the production of traditional foods, e.g. Indonesian tempe. LÄS MER