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

Claim 2:
3. The method of claim 1, wherein the at least one impurity includes at least one of:
one or more sulfur species selected from the group consisting of: alkyl, naphthenic or aromatic mercaptans, alkyl, naphthenic or aromatic disulfides, alkyl, aromatic, naphthenic or vinyl thiophenes, oxygenated sulfur containing hydrocarbon compounds, any other hydrocarbon compound including at least one sulfur atom in its molecule, and mixtures thereof, and
one or more color inducing species selected from the group consisting of: fulvenes, conjugated diolefins, oxygenated species, oxygenated sulfur species, styrene oligomers, alkynes and hydrocarbon compounds comprising conjugated olefin and alkyne bonds, and any other compound imparting a color of more than 10 as defined on Pt-Co scale to styrene.