08.08.2015   ABOUT THE AUTHOR

COMPARISON OF PYROLYTIC AND NON-PYROLYTIC LIQUIDS

A. Properties

A few properties of the liquid oils produced by selected flash pyrolysis and the PERC and LBL processes are listed in Table 8.13. It as apparent that there are some basic differences between the two classes of oils. The oils from the flash pyrolysis processes are quite similar, as are the oils from the PERC and LBL processes. But there are major differences in their elemental analyses and

TABLE 8.13 Comparison of Liquids Produced by Pyrolysis and Non-Pyrolytic Thermolysis”

Atmospheric

Ablative flash

PERC

LBL

Parameter

flash pyrolysis6

pyrolysis’

Process’*

Process’

Elements, % dry basis

C

52.1

53.5

78.9

79.2

H

6.2

6.2

8.5

7.8

О

41.4

39.6

12.3

14.4

s

0.06

Atomic ratio H: C

1.42

1.38

1.28

1.17

Raw product viscosity, Pa-s

0.22 (40)

1.3 (30)

0.14 (99)

0.046 (99)

(at °С)

Specific gravity

1.27

1.28

1.11

1.09

Moisture content raw product,

16.6

16.1

wt %

Heating value, MJ/dry kg

22.1

22.3

34.5

33.6

Yield, wt/wt MAF wood

0.53

0.55

0.53

0.25

“The data are from Stevens (1994). Some data were not available. bcf. O’Neil, Kovac, and Gorton (1990).

Ccf. Diebold et al. (1987, 1990). dcj. Thigpen and Berry (1982). ecf. Ergun (1981); Davis (1983).

energy values. The carbon analyses and energy values are much lower and the oxygen analyses are much higher for the pyrolytic oils than for the PERC and LBL oils. This might be expected, since a synthesis gas atmosphere is used to carry out the PERC and LBL processes. The lower yield of oil from the LBL process is apparent when compared to the oil yield from the PERC process.

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