Product Specifications
Distinction should be made between monomers, specific petrochemicals, and more or less typical oil fractions, produced by mixed plastics pyrolysis. Potential pyrolysis products from polyolefins are naphtha, kerosene, or gas-oil. These are blends of numerous different
|
Property |
Units |
Test method |
Value |
|
Density (15.6°C) |
g/cm3 |
ASTM D-4052 |
0.735 max. |
|
Reid vapour pressure |
psig |
ASTM D-323 |
12 max. |
|
Color Saybolt |
ASTM D-156 |
18 min. | |
|
Lead content |
wt ppb |
ASTM D-3559 |
50 max. |
|
Total sulfur |
wt ppm |
ASTM D-3120 |
100 max. |
|
Initial boiling point |
°C |
ASTM D-86 |
50 min. |
|
Final boiling point |
°C |
ASTM D-86 |
165 max. |
|
Paraffins |
wt% |
G.C |
80 min. |
|
Olefins |
wt% |
G.C |
1 max |
|
Naphthenes + aromatics |
wt% |
G.C |
Balance |
|
Total chlorides |
wt ppm |
IP-AK/81 |
10 max. |
hydrocarbons, but they still need to satisfy some common commercial specifications. Off-specification products have no market, even if they can be blended in small amounts into other streams that are less critical with respect to the specification compliances. The latter are measured according to established standards, e.g. those of the American Society for Testing Materials (ASTM), the American Petroleum Institute. Most monomers (polymerization grade) are high-purity products: 99.99% or more. The latter is difficult to attain in plastics pyrolysis!
The terminology used in oil refining is found at numerous websites, [16, 17]. As an example, naphtha specifications (Table 1.6) typically involve:
Specifications of other oil fractions obtained may involve (diesel oil) a cetane index, measures of unsaturation, or handling or safety data, such as cloud point or flash point.
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