Applications of Wet-End Paper Chemistry by L. Wågberg, L. Winter (auth.), Che On Au, Ian Thorn (eds.)

By L. Wågberg, L. Winter (auth.), Che On Au, Ian Thorn (eds.)

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The fatty acids are long chain aliphatic monocarboxylic acids with a chain length between 16-24 carbon atoms and can be saturated or unsaturated, but linolic acid (with two double bonds) is usually dominating. In addition the aliphatic fraction may contain fatty alcohols and waxes (fatty acid esters of other PAPER MACHINE DEPOSITS 29 alcohols and glycerols). g. g. betulinol). All these lipophilic components perform a function for the living tree, but the exact function is not clear for all substances.

The method is based on visual determination of colour change of the redox indicator with time relative to microbiological activity. Ninhydrin is a reagent that will show the presence of amino acids, pep tides and proteins through a change in colour. The method is so sensitive that even a finger print provides sufficient amino acids to show a positive reaction. Dehydrogenase is an enzyme present in all living microbiological material and the presence of this enzyme can be determined using 2,3,5-triphenyltetrazolium chloride.

One way of reducing pitch problems is to use a solid adsorbent. The organic material will either be adsorbed by the adsorbent or the adsorbent will, in a physical manner, coat the organic colloids. The use of a solid adsorbent can be seen to reduce the content of organic material available for deposition. Even though synthetic adsorbents are available, the most commonly used adsorbent is talc. Using this approach of organic deposit control, it is important to use an efficient quantity otherwise the talc will increase the content of material by being incorporated into the organic deposits.

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