Black Liquor Evaluations

Black Liquor Properties

Black Liquor (weak or strong)

Alkali, Total (conductimetric)
Alkali / ABC Titrations including: Active (AA), Effective (EA)
Anthraquinone
Ash (@ 600°C)
Boiling Point
Boiling Point Rise
Calorific Value (Gross) / Higher Heating Value (HHV) of BL Solids (BTU/lb)
Carbohydrates (wood sugars: arabinan, galactan, glucan, mannan, xylan)
Critical Solids (Burkeite)
Density
Elemental analysis (CHNO)
Fiber content
Lignin content
Metal Scan
Tall Oil content
Resin Acids + Fatty Acids (RFA – Rosin)
Solids, Total (percent)
Swelling characteristics of BL solids
Viscosity – multi-point BL solids / temperature curves or at single points
Sulfur – Total (photocombustion)
Sulfur species (SO4, SO3, S, S2O3)

Black Liquor Analysis Packages

Routine Evaluation

Calorific value (BTU/lb)
Percent solids
Total sulfur (S)
Total chloride (Cl)
Metal Scan
Elemental analysis (CHNO)

Extended Evaluation

Calorific value (BTU/lb)
Solids, total (percent)
Total sulfur (S)
Total chloride (Cl)
Metal Scan
Elemental analysis (CHNO)
Carbonate (Na2CO3)
Sulfate (Na2SO4)
Sulfite and thiosulfate (Na2SO3, Na2S2O3)
Active (and estimated effective) alkali
Total alkali
Organic/inorganic ratio (sulfated ash)
Viscosity of as received liquor measured at three temperatures in the range of 90°C to 115°C
Tall oil content

BL Viscosity and Swelling Properties

Reduced pressure evaporation of black liquor to three solids levels followed by measurement of viscosity at three temperatures
Calorific value (BTU/lb)
Organic/inorganic ratio (sulfated ash)
Swelling characteristics of dry liquor solids (duplicate)
Elemental analysis (CHNO)

Tall Oil Analysis

Tall Oil content of Black Liquor
Resin and Fatty Acids (RFA – Rosin)
Unsaponifiable matter (Higher Alcohols, etc.)
Acid Number
Water Content