Proof of concept of black liquor valorisation by partial wet oxidation

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Hurme, Markku, Docent, Aalto University, Department of Biotechnology and Chemical Technology, Finland
dc.contributor.advisor Koskinen, Jukka, Dr., Aalto University, Department of Biotechnology and Chemical Technology, Finland Hassan, Raja Muddassar 2016-12-15T10:01:36Z 2016-12-15T10:01:36Z 2016
dc.identifier.isbn 978-952-60-7199-2 (electronic)
dc.identifier.isbn 978-952-60-7200-5 (printed)
dc.identifier.issn 1799-4942 (electronic)
dc.identifier.issn 1799-4934 (printed)
dc.identifier.issn 1799-4934 (ISSN-L)
dc.description.abstract In today's pulp and paper industries, large quantities of black liquor are produced when wood or non-wood lignocellulosic feedstocks are digested with cooking chemicals to separate cellulose fibres from lignin, hemicellulose and other degraded components. Although black liquor is considered to be a waste product, it is rich in both dissolved organic components from wood and added cooking chemicals. In order to recover these cooking chemicals and generate energy from the dissolved organic compounds, it is common practice to burn black liquor in a recovery boiler. However, this is not always the case; for example in developing countries, where small-scale non-wood pulping mills tend to lack spent liquor treatment facilities, the resultant spent liquor is discharged into the environment without effective treatment. The aim of this thesis is to prove the concept of using partial wet oxidation (PWO) for the treatment of lignocellulosic-rich waste streams in order to produce chemicals on laboratory scale. In particular, the effluent from wood and non-wood pulping mills - i.e. black liquor - is investigated as a raw material for the PWO process in order to produce valuable chemical feedstocks and thus improve the profitability of pulping mills. Moreover, the data produced by this research will contribute by providing a much-needed estimate of the commercial feasibility of the PWO concept. The study consists of an investigation into the process concept, optimization of operating conditions, and the effect of numerous variables on the process yield in PWO. In addition to the PWO research, the concept of catalytic partial wet oxidation (CPWO) is studied. Fruthermore, the effect on lignin is studied by treating concentrated black liquors in a two-stage process comprising carbonation before PWO of the liquid phase. The experiments were carried out in a 100ml AISI 316 SS bench-scale high-pressure reactor. Feedstocks studied in this study included the following: wheat straw black liquor (WSBL), Kraft black liquor (KBL), hydrolysate from pulp bleach (HLP), and hydrolysate from wood (HLW). Additionally, spruce sawdust with a particle size of less than 1.5 mm was also used as feedstock for the PWO process. Analysis of the products from PWO was performed using the following methods: COD, TOC, pH, solid concentration, high performance liquid chromatography (HPLC), capillary electrophoresis and lignin properties. In this study, typically formic acid, acetic acid and lactic acid were determined quantitatively. Nevertheless, for some cases, more detailed analysis for some other carboxylic acids were also performed. en
dc.format.extent 67 + app. 39
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Aalto University en
dc.publisher Aalto-yliopisto fi
dc.relation.ispartofseries Aalto University publication series DOCTORAL DISSERTATIONS en
dc.relation.ispartofseries 267/2016
dc.relation.haspart [Publication 1]: Hassan, R.M., Melin, K., Kuppa, S., Koskinen, J., Hurme, M., Kokkonen, D., Kallas, J., Novel treatment method for black liquor and biomass hydrolysate with partial wet oxidation. Cellulose Chem. Technol. 49 (2015), 347-360.
dc.relation.haspart [Publication 2]: Hassan, R.M., Melin, K., Kokkonen, D., Riera, G.V., Golam, S., Koskinen, J., Green chemicals from pulp production black liquor by partial wet oxidation. Waste Manag. Res. 33 (2015), 1015-1021. DOI: 10.1177/0734242X15602807
dc.relation.haspart [Publication 3]: Hassan, R.M., Sipponen, M.H., Melin, K., Kokkonen, D., Pastinen, O., Golam, S., Effects of catalysts and pH on lignin in partial wet oxidation of wood and straw black liquors. Ind. Eng. Chem. Res. 54 (2015), 7833-7840. DOI: 10.1021/acs.iecr.5b01764
dc.relation.haspart [Publication 4]: Hassan, R.M., Melin, K., Koskinen, J., Production of carboxylic acids from alkaline pretreatment byproduct of softwood. Cellulose Chem. Technol. 48 (2014), 835-842.
dc.subject.other Chemistry en
dc.subject.other Paper technology en
dc.title Proof of concept of black liquor valorisation by partial wet oxidation en
dc.type G5 Artikkeliväitöskirja fi Kemian tekniikan korkeakoulu fi School of Chemical Technology en
dc.contributor.department Biotekniikan ja kemian tekniikan laitos fi
dc.contributor.department Department of Biotechnology and Chemical Technology en
dc.subject.keyword lignocellulosic biomass en
dc.subject.keyword black liquor en
dc.subject.keyword partial wet oxidation en
dc.subject.keyword alkaline cooking en
dc.subject.keyword non-wood pulping en
dc.identifier.urn URN:ISBN:978-952-60-7199-2
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Oinas, Pekka, Prof., Aalto University, Department of Biotechnology and Chemical Technology, Finland
dc.opn Simell, Pekka, Dr., VTT Technical Research Centre of Finland, Finland
dc.contributor.lab Plant Design Research Group en
dc.rev Ferrasse, Jean-Henry, Dr., Aix-Marseille University, France
dc.rev Mikkola, Jyri-Pekka, Prof., Åbo Akademi University, Finland 2017-01-27

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