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Analys av mjölksyraproduktion i en massafabrik
KTH, School of Biotechnology (BIO).
2014 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Analysis of possibilities for lactic and acid production in a pulp mill (English)
Abstract [en]

The pulp and paper industry have in the past been a stable and safe industry. A change has been seen during the last decades and the annual increase and demand for paperderived products has stagnated. Due to this, the industry is looking into new products to produce while utilising the great potential a pulp mill possess with regard to equipment and chemical regeneration. A biorefinery concepts have been suggested were pulp, lignin and lactic acid (100.000 tonne per year) could be produced simultaneously.

Lactic acid has during the two last decades seen a dramatic increase in demand and interst due to the possibility of polymerisation to produce polyactic acid, a biodegradable biopolymer. Fermentative and synthetic production of lactic acid could be seen in the industry with a larger interest in fermentative production, utilising microorganisms.

Simulations were conducted to evaluate different process designs for a pulp mill biorefinery concept. Three different process designs were simulated before selection of most suitable process design for integration to a pulp mill model. An alkaline pretreatment followed by simultaneous saccharification and fermentation for production and lastly precipitation and esterification for recovery of lactic acid was selected for integration study. Results indicate that with an investment of 140 MEUR, lactic acid could be produced at a cost of 0.42-0.44 EUR/kg, approximately 55% lower that the market price.

Place, publisher, year, edition, pages
Keyword [en]
lactic acid production, polyactic acid, pul mill, biorefinery, simulation
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-163692OAI: diva2:801903
Available from: 2015-04-13 Created: 2015-04-10 Last updated: 2015-09-15Bibliographically approved

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