Raffinate is obtained from ethylene and propylene process in a cracker via butadiene (BD) production. Typically it is a multi-component mixture that can contain paraffin, olefins, cycloalkanes, and aromatics. Depending on how many of the dominant hydrocarbons are presented, there are C4, C5, and C6 raffinites. Raffinites, which is also known as Crude C4, Raffinate 1 or Raffinate 2 and mixed C4s, are usually a by-product of olefins and aromatic units. If raffinite is produced from an aromatic unit, it is called aromatic raffinite to determine whether its constituents contain BTX.

Raffinate 1, remaining when butadiene is extracted from a lower olefin stream, is used in the manufacture of fuel components and polymers, such as:

  • Poly-isobutylene
  • Butyl rubber
  • Methyl tertiary butyl ether (MTBE)
  • Di-isobutylene
  • alkylate gasoline

Raffinate 2 is produced from Raffinate 1 when iso-butenes have been extracted. It is used in the manufacture of:

  • Secondary butyl alcohol (SBA)
  • Methyl ethyl ketone (MEK)

Raffinate
PROPERTIES UNIT UNIT TEST METHOD
Density @ 15.56 °C Kg/ m3 790 min ASTM D 1298
IBP °C 150 min ASTM D 86
FBP °C 250 max ASTM D 86
Flash Point °C 60 min ASTM D 93
Color 20 min ASTM D 156
Sulfur Total Wt% 0.05 max ASTM D 1266
Corrosion 3 hrs @ 100 °C 2c max ASTM D 130
Mercaptan Content Wt% 0.001 max ASTM D 3227

Packing

  • Bulk 
  • Flexitank 

Application of Raffinate 

According to the source of the raffinate production, raffinates are used:

  • Fuels
  • Olefins feed
  • Cleaning compounds
  • Oil treating chemicals
  • Paint removers
  • Surface coatings
  • Adhesives
  • Thinners
  • Printing inks
  • Cleaning agents.

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