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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

  • Viresco Solutions

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    Country of registration
    Canada
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    Sector(s) of expertise
    Agriculture
    Agriculture and forestry
    Renewable energy
    Forestry
    Industry

    Viresco Solutions is a consulting firm based in Calgary, Alberta, Canada.

  • Instituto de Investigación Geológico y Energético

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    Ecuador
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    TA proponent
    Sector(s) of expertise
    Renewable energy
    Energy efficiency
    Transport
    Waste management

    IIGE is a research institute that promotes development, innovation and transmission of technology focused on energy efficiency and renewable energy.

  • Black Liquor Recovery: How Does it Work?

    Publication date
    Objective
    Mitigation

    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

    Publication date
    Objective
    Mitigation

    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.

  • Non-Water-Based Sanitation

    The device that is simple cheap and effective. The self contained chemical toilet automatically separates solid and liquid waste into different compartments. Instead of flushing the toilet a chemical process is starting which converts the solid waste including toilet paper into sterile ash in less than a minute. The liquids are being sterilized and recycled.

  • Process for manufacturing acid-resistant biopolymer-lignin-membranes

    Technology
    Black liquor

    The invention is a process for manufacturing acid-resistant biopolymer-lignin-membranes from the liquor from cellulose extraction processes. Black liquor is dried in the first stage of the process and is finally pressed into form. Through treatment with acid the lignin membranes acquire their porous structure and become insoluble in water and resistant to acid. According to use the membranes can be cleaned with water to remove the acid portion. The resulting membranes let filtration processes be carried out effectively and inexpensively and can be used as encapsulating media.

  • The manufacture of water-insoluble lignin-agglomerates from black liquor

    This invention is a process for manufacturing water-insoluble lignin-agglomerates in the form of granulates or briquettes from liquor left over as waste from processes of cellulose-extraction. The extract can be used energetically or materially. The extract is firstly granulated through spray-granulation or mix-agglomeration leaving lignin-agglomerates then is treated with acid lowering its pH-value and making it insoluble in water. This process can make not only lignin-granulates but also lignin-briquettes.

  • Waste water treatment and Water resources management

    Lesico CleanTech is a pioneer in delivering sustainable technologies which recycle or minimize the volume of liquid waste primarily desalination rejected brine. The solutions not only help users comply with stringent regulation but result in substantial savings in real estate installation and operational costs.