Techno-economic evaluation for the process optimization of galactoglucomannan and lignin recovery by ultrafiltration

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Abstract

Galactoglucomannans (GGM) can be used as a precursor for the production of surfactants, plastics, hydrogels etc. However, separation of galactoglucomannan (GGM) from lignin and lignin-carbohydrate-complexes using membrane filtration is difficult. Precipitation of GGM with anti-solvents is an approach that has been previously studied. A membrane filtration step prior to precipitation is economically beneficial to decrease anti-solvent requirements with increasing concentration of GGM. However, previous studies have shown that membrane fouling is a problem that can have a large impact on the life-time of the membranes but also the overall yield of the products.

The raw material used in this study was a sodium-based spent-sulfite-liquor (SSL) provided by Domsjö Fabriker (Örnsköldsvik, Sweden) and is the outtake after the first pulping step of softwood (60 % Picea abies and 40 % Pinus sylvestris). The SSL was concentrated with a 50 kDa polysulfone membrane (hydrophobic) and four regenerative cellulose membranes (30, 20, 10 and 5 kDa) (hydrophilic) to a volume reduction of 90 %. The resulting retentate was analyzed for the composition and the product yields were calculated. Membrane data, such as, flux, trans-membrane pressure, cross-flow velocity and degree of fouling were used together with the GGM yields in a techno-economic evaluation to find a cost-efficient process for the separation and purification of GGM and lignin from SSL.

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Subject classification (UKÄ) – MANDATORY

  • Chemical Process Engineering
Original languageEnglish
Publication statusPublished - 2018 Apr 29
Publication categoryResearch
Peer-reviewedNo
Event40th Symposium on Biotechnology for Fuels and Chemicals - Clearwater Beach, Clearwater beach, United States
Duration: 2018 Apr 292018 May 3

Conference

Conference40th Symposium on Biotechnology for Fuels and Chemicals
Abbreviated titleSBFC
CountryUnited States
CityClearwater beach
Period2018/04/292018/05/03

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