High-temperature pH measuring during hot-water extraction of hemicelluloses from wood

    Tutkimustuotos: LehtiartikkeliArtikkeliTieteellinenvertaisarvioitu

    15 Sitaatiot (Scopus)

    Abstrakti

    A high-temperature pH measuring system was developed, calibrated, and validated for measuring pH during hot-water extraction of hemicelluloses from wood. The aim was to measure in-line pH during extraction in order to control the extraction pH. An yttria-stabilized Zr/ZrO2 electrode was used for measuring the potential. Phthalate and phosphate buffers were used to calibrate the system at 160, 170, and 180 degrees C. Also, different buffer concentrations were tested for stability. Tap water and different salt solutions were tested to investigate the system response to pure water and water solutions. Calibration curves were acquired from the calibration results and Nernst equation was used to calculate the in-line pH during wood extractions. The setup showed stable and reliable potential readings during both calibration tests and wood extractions. The in-line pH was found to be 0.35 pH units higher than when measured at room temperature with a conventional pH meter.
    AlkuperäiskieliEi tiedossa
    Sivut9–15
    Sivumäärä7
    JulkaisuIndustrial Crops and Products
    Vuosikerta61
    DOI - pysyväislinkit
    TilaJulkaistu - 2014
    OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

    Keywords

    • Hemicelluloses
    • High-temperature pH
    • Hot-water extraction
    • pH calibration
    • Spruce wood

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