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High Yields of Bio Oils from Hydrothermal Processing of Thin Black Liquor without the Use of Catalysts or Capping Agents
Stockholm University, Faculty of Science, Department of Organic Chemistry. RenFuel AB, Sweden.
Number of Authors: 32018 (English)In: ACS omega, ISSN 2470-1343, Vol. 3, no 6, p. 6757-6763Article in journal (Refereed) Published
Abstract [en]

Black liquor (BL) from the kraft pulping process has been treated at elevated temperatures (380 degrees C) in a batch reactor to give high yields of a bio oil comprising monomeric phenolic compounds that were soluble in organic solvents and mineral oil and a water fraction with inorganic salts. The metal content in the product was < 20 ppm after a simple extraction step. A correlation between concentration, temperature, and reaction time with respect to yield of desired product was found. At optimal reaction conditions (treating BL with 16 wt % dry substance at 380 degrees C for 20 min), the yield of extractable organics was around 80% of the original lignin with less than 7% of char. The product was analyzed by gel permeable chromatography, mass spectroscopy, nuclear magnetic resonance, elemental analysis, and inductively coupled plasma. It was found that a large fraction composed of mainly cresols, xylenols, and mesitols. This process provides a pathway to convert a major waste stream from a pulp mill into a refinery feed for fuel or chemical production, whereas at the same time the inorganic chemicals are recovered and can be returned back to the pulp mill.

Place, publisher, year, edition, pages
2018. Vol. 3, no 6, p. 6757-6763
National Category
Organic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-158283DOI: 10.1021/acsomega.8b00854ISI: 000436340500096OAI: oai:DiVA.org:su-158283DiVA, id: diva2:1236242
Available from: 2018-08-01 Created: 2018-08-01 Last updated: 2018-08-01Bibliographically approved

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