Pyrolysis gasoline or Pygas is a naphtha-range product with a high aromatics content. It is a by-product of high temperature naphtha cracking during ethylene and propylene production. PyGas has high potential for use as a gasoline blending mixture and/or as a source of aromatics. Currently, PyGas is generally used as a gasoline blending mixture due to its high octane number.  Pyrolysis gasoline can be blended with other hydrocarbons as a gasoline additive, or distilled (in BTX process) to separate it into its components, including benzene.

Petrol is a transparent, petroleum-derived liquid that is used primarily as a fuel in internal combustion engines. The characteristic of a particular gasoline blend to resist igniting too early (which causes knocking and reduces efficiency in reciprocating engines) is measured by its octane rating. Tetraethyllead and other lead compounds are no longer used in most areas to regulate and increase octane-rating, but many other additives are put into gasoline to improve its chemical stability, control corrosiveness and provide fuel system ‘cleaning,’ and determine performance characteristics under intended use. Sometimes, gasoline also contains ethanol as an alternative fuel, for economic or environmental reasons.

Gasoline A-85

PropertiesUnitSpecificationTest Method
Density @20 °Cg/cm30.725 MaxASTM D 1298
ColorSayboltLight/ Red, Yellow
Total Sulfurppm500 MaxASTM D 4294
Lead Contentppb10 MaxA.A
IBP°C35 MinASTM D 86
FBP°C210 MaxASTM D 86
Paraffin Naphthenes%Wt40 MinG.C
Aromatics%Wt25 MaxG.C
Others%Wt15 MaxG.C
RON85 MinInfrared

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Gasoline A-92

PropertiesUnitSpecificationTest Method
Density@ 20 °Cg/ml0.755 MaxASTM D 1298
ColorSayboltLight Red/Yellow
Total Sulfurppm100 MaxASTM D 4294
Lead Contentppb10 MaxA.A
IBP°C35 MinASTM D 86
FBP°C210 MaxASTM D 86
Paraffin Naphthenes%Wt30 MinG.C
Aromatics%Wt35 MaxG.C
Benzene%Wt1 MaxG.C
Others%Wt15 MaxG.C
RON92 MinInfrared
MON84 MinInfrared

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PropertiesUnitResultExpectedTest Method
Density @15°Cg/cm30.7391710 min – 780 maxASTM D 1298
RON95.295 minASTM D 2699
MON85.285 minASTN D 2700
RVP @ 37.8°CkPa63.249 min – 83 maxASTM D 323
Distillation, 10% vol. recovered°C50.374 maxASTM D 86
Distillation, 50% vol. recovered°C82.2127 maxASTM D 86
Distillation, 90% vol. recovered°C167.1190 maxASTM D 86
FBP°C202.6225 maxASTM D 86
Olefins Content%Vol9.526 maxASTM D 1319
Aromatics Content%Vol26.735 maxASTM D 5580
Benzene Content%Vol0.641 maxASTM D 5580
Oxygenates (MTBE)%Vol12.915 maxASTM D 4815
Total Sulfur Contentppm11150 maxASTM D 5453
Lead contentg/L<0.0025NilASTN D 3237

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Dry Pyrolysis Gasoline (DPG)

PropertiesUnitResultExpectedTest Method
Density @15.6 °Cg/cm30.850.9 MaxASTM D 4052
RVPpsi6.5ReportASTM D 323
Total Sulfurppm180ReportASTM D 5453
IBP°C38ReportASTM D 86
FBP°C185ReportASTM D 86
5% Vol Recovered°C51ReportASTM D 86
95% Vol Recovered°C177ReportASTM D 86
Paraffin%Wt2.1Max 3G.C
Olefins%Wt24.5Max 30G.C
Naphthenes%Wt0.4Max 0.6G.C
Aromatics%Wt66.460 MinG.C
Others%Wt6.620 MaxG.C
Benzene Content%Wt42.440 MinG.C

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Hydrogenated Pyrolysis Gasoline (HPG)

PropertiesUnitSpecificationTest Method
Specific gravity @15°C0.78 – 0.84ASTM D 1298
ColorSaybolt+ 5 Min.ASTM D 156
RVPpsi5 – 12ASTM D 323
IBP°C34 Min.ASTM D 86
FBP°C210 Max.ASTM D 86
Aromatics%Wt50 Min.By GC
Total Sulfurppm (wt)300 Max.ASTM D 3120
Copper CorrosionNo. 1aASTM D 130
Lead Contentppb5 Max.ATOMIC