Search for dissertations about: "sulfite"

Showing result 1 - 5 of 40 swedish dissertations containing the word sulfite.

  2. 1. Wood chips for kraft and sulfite pulping : evaluation of novel forest-industrial drum-chipping technology

    Author : Jessica Gard Timmerfors; Leif J. Jönsson; David Blomberg; Sören Östlund; Umeå universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wood chip; drum chipper; impregnation; pulping; sulfite process; kraft process; Scots pine; Norway spruce; heartwood; frozen wood; moisture content;

    Abstract : Wood chipping and the supply of high-quality wood chips are of critical importance for most forest-industrial processes. The quality of wood chips affects product yield, product quality, and processability. READ MORE

  4. 2. Characterization of cellulose pulps and the influence of their properties on the process and production of viscose and cellulose ethers

    Author : Peter Strunk; Bertil Eliasson; Roland Adden; Umeå universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cellulose ether; dissolving pulp; ethyl hydroxyethyl cellulose; hardwood; multivariate data analysis; reactivity; softwood; sulfate; sulfite; viscose;

    Abstract : Today’s market offers an ever-increasing range of cellulose pulps (derivative pulps) made fromvarious wood types through different delignification processes. Each pulp segment has its uniquecharacteristics, which makes it difficult for the producer of cellulose derivatives to choose the mostsuitable pulp for optimum processability and product quality. READ MORE

  5. 3. Control of Proteolysis of Recombinant Proteins in Escherichia coli

    Author : Aleksei Rozkov; KTH; []
    Keywords : proteolysis; recombinant protein; E. coli; bioprocess scale-up; protein A; ATP; sulfite; amino acids; growth inhibition; fed-batch culture; ZZT2;

    Abstract : .... READ MORE

  6. 4. The initial phase of sodium sulfite pulping of softwood : A comparison of different pulping options

    Author : Raghu Deshpande; Ulf Germgård; Pedro Fardim; Karlstads universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Activation energy; acid sulfite pulping; bisulfite pulping; cellulose; delignification; dissolving pulp; extractives; glucomannan; hemicelluloses; lignin; lignin condensation; lignin carbohydrate complexes; pine; spruce; thiosulfate; total SO2; xylan; Chemical Engineering; Kemiteknik;

    Abstract : Single stage and two-stage sodium sulfite cooking were carried out on either spruce, pine or pure pine heartwood chips to investigate the influence of several process parameters on the initial phase of such a cook down to about 60 % pulp yield. The cooking experiments were carried out in the laboratory with either a lab-prepared or a mill-prepared cooking acid and the temperature and time were varied. READ MORE

  7. 5. Asthma and cancer among pulp and paper mill workers

    Author : Eva Andersson; Göteborgs universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; epidemiology; pulp and paper industry; irritant-induced asthma; gassings; cancer; sulfate mills; sulfite mills; maintenance work; brain tumors; glioma; lung cancer; asbestos;

    Abstract : There were two main aims of this thesis. One was to study if repeated high exposures to irritant gases give rise to new-onset asthma, and the other was to study if exposure in pulp and paper mills were associated with cancer. READ MORE