It is important to separate and purify different chemical liquids such as cooking liquids, fermentation tanks and black liquor in traditional forest industry process liquids and materials, as well as in the biorefinery area.
In processes, there is a need to separate and identify different chemical compounds and substances in order to gain more knowledge about content and process. It is possible to separate cooking liquids such as black liquor, acid liquor, fermentation tanks, lignin, lignosulfonate, hemicellulose.
It is also possible to separate different organic acids (keto acids) such as levulinic acid, pyruvic acid, oxaloacetate, acetoacetic acid, ethanol, glycerol and lactic acid, formic acid, acetic acid, the furan derivatives hydroxymethylfurfural (HMF) and furfural. It is also possible to measure organic acids in black liquors.
Optical brighteners are expensive chemicals that should preferably stick to the surface of the paper and end up in the drain as little as possible. Environmental reasons also speak for the latter. With HPLC analyzes, both qualitative and quantitative determinations of the presence of optical brighteners can be made in both paper and in different flows around the paper machine. In competing analyzes, it is often possible to determine whether the optical brightener used is the optical brightener of the di-, tetra- or hexate type.
Examples of chemical compounds:
Ion compounds: acetates, borates, benzoates, citrates, cyanides, fluorides, phosphates, carbonates, chlorides, nitrates, nitrites, stearates, sulfates, sulfites.