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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Skillnad i reaktivitet mellan olika cellulosaråvaror vid framställningen av cellulosaacetat / Differences in reactivity between different cellulose raw materials in  synthesis of cellulose acetate

Bengtsson, Karl-Petter January 2020 (has links)
Detta arbetes syfte är att utveckla en metod som konsekvent kan hitta skillnader mellan olika cellulosaråvarors reaktivt vid syntetiseringen av cellulosaacetat med ättiksyraprocessen.  Detta undersöktes genom att förändra reaktionsparameterna mängd adderad svavelsyrakatalysator och temperatur. För att kunna mäta skillnader mellan råvarorna så användes utbytesmätningar. De egenskaper hos cellulosaråvarorna som antogs ha relevans för mätningarna var råvarornas polymeriseringsgrad (DP) och deras cellulosahalt. Detta arbete kunde inte komma fram till en definitiv metod som visade signifikanta skillnader mellan de cellulosaråvaror som användes men förslag för att förbättra metoden som användes i arbetet föreslås. / The purpose of this work is to develop a method that can consistently find differences between different cellulose raw materials reactively in the synthesis of cellulose acetate with the acetic acid process. This was investigated by changing the reaction parameters amount of added sulfuric acid catalysis and temperature. In order to measure differences between the raw materials, exchange measurements were used. The properties of the cellulose raw materials that were assumed to be relevant for the measurements were the degree of polymerization of the raw materials (DP) and their cellulose content. This work could not come up with a definitive method that showed significant differences between the cellulose raw materials used but suggestions for improving the method used in the work are proposed.

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