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Processing Lignins. Guozhan Jiang. Objectives. To find a method to convert Etek and Asian lignins into bio-oils. To characterise the products using PyGC/MS and other chromatographic or spectroscopic methods. To upgrade the bio-oils to valuable chemicals or transportation oils. . Outline.

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processing lignins

Processing Lignins

Guozhan Jiang

objectives
Objectives
  • To find a method to convert Etek and Asian lignins into bio-oils.
  • To characterise the products using PyGC/MS and other chromatographic or spectroscopic methods.
  • To upgrade the bio-oils to valuable chemicals or transportation oils.
outline
Outline
  • Component determination
  • PyGC-MS work
  • Preliminary work for run on 150g/h rig
  • Alternative way to pyrolysis
  • Future work
component determination wet chemistry method
Component determination: wet chemistry method

Extractives:

Extracted using: ethanol/toluene (6hrs)

ethanol (4hrs)

water (2hrs)

Lignin (Klason):

0.1M NaOH boiling 1hr

72% H2SO4 treatment 4hrs

Biomass

Cellulose:

NaClO2 bleaching of holocellulose

Hemicellulose:

17.5% NaOH treatment of cellulose

component determination
Component determination
  • The component of Etek lignin can be determined using this method.
  • This method is not suitable for Asian lignin since the extractive free samples can be completely dissolved in 0.1M NaOH.
  • Asian lignin must have a much less cross-linking density in its molecular structure.

Conclusions

pygc ms work
PyGC-MS work

Species containing m/z =94 and 78

Asian lignin @600oC for 15s

slide8

Etek lignin species containing

m/z = 94 and 78

Etek lignin@600oC for 15s

slide9

Asian lignin@600oC for 15s

Asian lignin @400oC for 15s

slide10

Etek lignin 400 and 600

Etek lignin @600oC for 15s

Etek lignin@400oC for 15s

pygc ms work1
PyGC-MS work
  • The two lignins can not be pyrolysed effectively at 400oC.
  • Asian lignin is a ‘real’ lignin.
  • Etek lignin has similar composition to normal biomass.

Conclusions

preliminary work for run lignins on 150g h rig
Preliminary work for run lignins on 150g/h rig
  • The two lignins are difficult to feed continuously.
  • Two approaches to be adopted for feeding properly (1) Modify feeding system, (2) Modify lignins.
  • Modification of lignins is chosen in this work by pelitization.
pellitization

Asian lignin

Mixing

Heating up

Suspension

“Dough” like

80oC

Ethanol

Drying

Pellet

Pellitization

Alcohol extracted compounds as binders

pelletization of asian lignin
Pelletization of Asian lignin

Before pelleting

After pelleting

alternative to pyrolysis1
Alternative to pyrolysis

Extractive free sample

dissolved in 0.1M NaOH,

2%

future work
Future work
  • Run Asian and Etek lignins on 150 g/h rig for pyrolysis
  • Hydrogenation of lignin pyrolytic products to produce saturated phenol and phenol substitutes, which may be used to produce phenolic resin.
  • Quantification of mass balance using Py-GC/MS.
  • Hydrogen, steam or alcohol assisted pyrolysis to reduce char formation.
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