Additive for glycol solvent used in aromatic extraction
AssigneeUnion Oil Company of California
InventorDonald M. Fenton
Life of this patent
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Abstract
Hydrazine is added to glycol solvents utilized for aromatic extraction so that corrosion is minimized while the extractive efficiency of the solvent is maintained.
Claims13
In a process for treating a fluid mixture of aromatic compounds and aliphatic compounds wherein the fluid mixture is contacted with a glycol solvent solution containing water and a glycol under conditions such that said aromatic compounds are selectively extracted into said solvent, and a glycol-aromatics extract is separated from an aliphatic raffinate, and said extract is separated into glycol and aromatic compounds, with said glycol being recycled to contact said fluid mixture, the improvement comprising reducing the concentration of peroxides formed in said solution by adding hydrazine to said glycol solvent solution and heating the resultant admixture.
In a process for treating a fluid mixture of aromatic compounds and aliphatic compounds wherein the fluid mixture is contacted with a glycol solvent solution containing water and a glycol under conditions such that said aromatic compounds are selectively extracted into said solvent, and a glycol-aromatics extract is separated from an aliphatic raffinate, and said extract is separated into glycol and aromatic compounds, with said glycol being recycled to contact said fluid mixture, the improvement comprising reducing the concentration of dissolved iron formed in said glycol solvent solution by adding hydrazine to said glycol solvent solution and heating the resultant admixture.
In a process for treating a fluid mixture of aromatic compounds and aliphatic compounds wherein the fluid mixture is contacted with a glycol solvent solution containing water and a glycol under conditions such that said aromatic compounds are selectively extracted into said solvent, and a glycol-aromatics extract is separated from an aliphatic raffinate, and said extract is separated into aromatic compounds and glycol, with said glycol being recycled to extract more aromatics from said fluid mixture, the improvement comprising reducing the concentrations of dissolved iron and hydroperoxide formed in said glycol solvent solution by adding hydrazine and heating the resultant admixture.
Dependencies are inferred from the claim text.