Abstract
Fatty and resin acids in bark residues generated by forest industries can be used to produce high-value green chemicals, but more information about their concentrations in potential sources is required. We examined variations in the content of lipophilic extractives from both pulpwood bark and timber bark of Norway spruce and Scots pine trees growing in homogenous stands in mid-Sweden. We found that spruce pulpwood bark had the highest total amounts of fatty and resin acids (average yield, 0.9 kg/m3 wood). The regression functions, based on readily available tree parameters (age, stem diameter, height, growth rate and inner bark proportions), can be used to predict the concentrations of fatty and resin acids, triglycerides, sterols and steryl esters in bark materials before harvesting stands that supply industrial plants.
Highlights
Tall oil is a by-product of softwood Kraft pulping, which is widely used as a raw material for fuels and chemicals [1]
With the aim of improving the use of Scots pine and Norway spruce bark, the objective of the present study was to map variations in its content of lipophilic extractives in relation to measured tree parameters and assortments obtained in thinning and final felling operations
There was no significant difference in basic density between the pine timber and pulpwood bark density than the 307 pine bark
Summary
Tall oil is a by-product of softwood Kraft pulping (sulphate process), which is widely used as a raw material for fuels and chemicals [1]. The main constituents of tall oil are fatty and resin acids (ca 90%), which are sold (following fractionation by distillation) as pure tall oil fatty acids and tall oil rosin (or resin acids), respectively. Bark from both of the two main softwood species, Fennoscandia, Scots pine (Pinus sylvestris L.). Karst.), is commonly used to produce heat at mills or nearby power plants It contains relatively high amounts of fatty and resin acids [2,3]. To optimize the exploitation of bark to produce green chemicals, it is essential to map key constituents ( fatty and resin acid contents) in bark assortments
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