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Black liquor

In industrial chemistry, black liquor is the waste product from the kraft process when digesting pulpwood into paper pulp removing lignin, hemicelluloses and other extractives from the wood to free the cellulose fibers.The equivalent material in the sulfite process is usually called brown liquor, but the terms red liquor, thick liquor and sulfite liquor are also used.

Black liquor

  • Scaling up energy efficiency in tofu and tempe SMEs in Indonesia

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    Background

    Tofu and tempe are fundamental to the Indonesian diet. Demand for these products is served by an industry of small and medium sized enterprises (SMEs) employing 285000 workers in 85000 businesses. Production practices are extremely energy inefficient and environmentally damaging. Enterprises use firewood resulting in a per-factory emissions average of 450 tons CO2/year and sector-wide emissions of 30 million tons.

  • Valorisation Énergétique des Huiles de Vidange par Incino-gazeification

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    Objective:

    L’industrialisation des pays en voie de développement engendre l’augmentation des déchets liquides que sont les huiles de vidange, tout en se heurtant au problème de déficit énergétique. D’autre part, elle s’accompagne d’une forte croissance démographique qui accentue et augmente la quantité de déchets, particulièrement les déchets ménagers solides. Ce qui constitue une réelle menace pour l’environnement et les populations.

  • Computer-Based Tools to Estimate RE Production and GHG Reductions from Biodigestion of Animal Waste

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    The goal of this project is to develop a web-based tool for small and medium-sized farms to be able to estimate potential renewable energy MWh and GHG reduction and costs for adding biodigestors to produce biogas for fuel and to reduce environmental impact from disposal of untreated liquid wastes.

    Output

  • Web-Based Tools to Estimate RE Production and GHG Reductions from Biodigestion of Animal Waste

    Type: 
    Publication
    Publication date:
    Objective:
    Sectors:

    The goal of this project is to develop a web-based tool for small and medium-sized farms to be able to estimate potential renewable energy MWh and GHG reduction and costs for adding biodigestors to produce biogas for fuel and to reduce environmental impact from disposal of untreated liquid wastes.

    Outputs

  • Black Liquor Recovery: How Does it Work?

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    Black liquor (BL), a by-product of the papermaking process, is an important liquid fuel in the pulp and paper industry. It consists of the remaining substances after the digestive process where the cellulose fibres have been cooked out from the wood. This report is aimed to provide a comparison of the recovery boiler with a pressurised gasifier for black liquor. Fundamentals concerning the conversion of black liquor, some details about the two recovery technologies and differences between these two will be presented.

  • Black Liquor Gasification

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    This article explains the basics of black liquor gasification in the pulp and paper industry. Black liquor, which accounts for most of the fuel consumed in Kraft mills, is usually combusted in recovery boilers to recover chemicals and to produce process steam and on-site electricity (via a steam turbine). The efficiency of such boilers is, however, low (around 65%-70%). Black liquor gasification is a process in which a clean synthesis gas (syngas) is produced from black liquor by converting its biomass content into a gaseous energy carrier.