PCTM 23 Method of estimating total crude tall oil in wood pulp
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PCTM 23 Method of estimating total crude tall oil in wood pulp



This test is used to estimate the total amount of crude tall oil in a given wood pulp sample. Washed pulp will contain (1) tall oil soaps which were not effectively washed from the pulp and (2) unsaponified resin and fatty acids which were not converted to sodium soaps in the digester. In this procedure, the pulp sample is boiled in strong caustic to convert the unsaponified tall oil components to their sodium soaps. The pulp is then washed well and the filtrate recovered from the digesting and washing steps is combined and analyzed to estimate the total crude tall oil in the pulp. If this number exceeds 5 kg CTO/ton of pulp, it can indicate problems with either the digesting or washing operations. To differentiate between the unsaponified tall oil components and the unwashed soap, a second portion of the pulp sample should be washed well using dilute caustic. Analysis of the washing filtrate (using PCTM 24) will give the unrecovered soap content of the washed pulp. The difference between that number and the total crude tall oil in the pulp is an estimate of the unsaponified tall oil content If this number exceeds 1 kg CTO/ton of pulp, problems with the digester or with calcium soap formation are indicated.


Author: PCA Testing Subcommittee - Provided by: Jim Russell - ID: 200.PCTM.23 - Date: 12/31/1996

Providing Organization: Pine Chemicals Association


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