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Improved Impregnation of Wood Chips and Increased Pulp Yield by Sulfate Cooking
KTH, School of Chemical Science and Engineering (CHE).
2016 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Förbättrad impregenering av vedflis och ökat utbyte i sulfatkoket (Swedish)
Abstract [en]

The aim in pulp production is to liberate the wood fibres. This study investigates the possibility of using a high effective alkali charge and a low temperature in the impregnation step when using Kraft cooking to produce pulp. This specific approach increases the rate of diffusion without risking enhancing the peeling process, which could result in a higher yield. This study has used eucalyptus wood chips and the impregnation step has been carried out by using an alkali concentration similar to what is currently being used in the pulp mills, which is in this study is referred to as "REF", and the higher alkali concentration which is referred to as HAI. The impregnation temperature for the REF case was 130 °C and for the HAI cases were 105 °C and 115 °C. The study was divided in two parts; an impregnation pre-study and a cooking study. The cooking parameters were kept constant because in this study only the impregnation has been of interest.

The results from the impregnation pre-study were that for the HAI cases, when the temperature increased, the residual alkali decreased. The temperature also affected the yield, in such way that as the temperature increased, the yield decreased which means that more carbohydrates were dissolved. In the cooking study, the high alkali impregnation resulted in shorter cooking times. The initial concentration of OH

- in the cooking was too low (0.6 M) and this made the delignification eventually decline.

Place, publisher, year, edition, pages
2016.
Keywords [en]
Kraft Cooking, Eucalyptus, Impregnation stage, Pulp technology, Alkali consumption
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-207580OAI: oai:DiVA.org:kth-207580DiVA, id: diva2:1097099
Available from: 2017-05-22 Created: 2017-05-22 Last updated: 2017-05-22Bibliographically approved

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  • Other locale
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