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Suppression of Bio-oil Phase Separation
Researchers at Aston University have discovered an innovative technique for suppressing the phase separation of bio-oils, and extracting natural lignins from bark.
  • Prevents separation of bio-oil into distinct phases
  • Increases usefulness of bio-oil
  • Improved processability of a wide variety of difficult materials
  • Provides environmentally friendly, natural lignins
Background
Synthetic resins such as the formaldehyde family are widely used in the production of manmade wood products, such as plywood and fibre board. Natural lignins are structurally similar to these synthetic resins and provide a sustainable, less toxic alternative. Natural lignins however are difficult to handle due to their separation into aqueous and organic (tar) phases. A faster rate of condensation by the organic phase also reduces its usefulness as a replacement for synthetic resins. During separation, crucial components are lost from the organic phase, further reducing its usefulness.
The Technology
Aston scientists have realized that the use of certain additives during pyrolysis of lignin-rich biomass results in a bio-oil which does not separate into distinct phases. This technique is especially useful when the pyrolysed biomass consists of wood bark. The additives consist of high boiling point isoparaffinic liquid solvents acting as coolants, and an alcohol acting as a phase separation suppression agent.