Patent ID: 11919853
Assignee: SULZER MANAGEMENT AG
Field: Chemical engineering (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 8:
9. The method of claim 1, wherein the crude composition derives from a pygas, and:
the crude composition has been prepared by distilling a pygas feed composition so as to obtain a C8-fraction and subjecting the C8-fraction to an extractive distillation in which the C8-fraction is treated with a polar solvent so as to obtain a styrene containing fraction as an overhead stream, as a side stream or as a bottom stream, which is used as the crude composition or which is processes into the crude composition, or
the crude composition has been prepared by distilling a pygas feed composition so as to obtain a C8-fraction, feeding the C8-fraction into a hydrogenation reactor so as to obtain a hydrogenated gas, subjecting the hydrogenated gas to an extractive distillation in which the hydrogenated gas is treated with a polar solvent so as to obtain a styrene containing fraction as an overhead stream, as a side stream or as a bottom stream, which is used as the crude composition or which is processes into the crude composition.