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AssigneeExxon Research & Engineering Co.
InventorsRobert E. Overfield, Winston K. Robbins, Joel I. Haberman
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A sample of a hydrocarbon oil containing asphaltenes is chromatographically analyzed by forming a mixture of the oil with a weak solvent. The mixture is passed in contact with a column of a stationary phase of fine solid particles of fully functionalized material, followed by a weak solvent. The solvent, after recovery from the column, is analyzed for aromatics by UV-absorption of UV radiation in the range 200 to 400 nm. The absorbance of the UV light by the irradiated eluents across the UV wavelength range is monitored and the integral of absorbance is derived as a function of photon energy across the wavelength range. The magnitude of the derived integral in at least one time interval corresponding with aromatics in the eluent from the stationary phase is measured as an indication of the level of aromatics in the oil sample. The weak solvent may be followed by a strong solvent which, in turn, may be followed by a strong solvent which is modified by the addition of a hydrogen bonding solvent.
A process for refining or upgrading a petroleum hydrocarbon feed, in which samples of hydrocarbon oil produced in the process are each chromatographically analyzed to determine the level present of at least one component in the oil, and in which the operation of the process is controlled in dependence upon the determined level present of said at least one component, the analysis comprising the steps of:
A process for refining or upgrading a petroleum hydrocarbon feed containing asphaltenic materials in which the feed is passed to a fractionation unit having a temperature and pressure gradient thereacross for separation into components according to the boiling ranges thereof, said components being recovered from respective regions of the fractionation unit and including a gas oil component boiling in a gas oil boiling range which is recovered from a gas oil recovery region of the unit, wherein discrete samples of gas oil fraction are taken from the recovered gas oil fraction at intervals and each analyzed, and wherein a signal representative of the amount of asphaltenic material present in each sample is generated and employed to modulate the operation of the fractionation unit so that the amount of polar component in the gas oil component is maintained below a predetermined amount, the analysis comprising quantifying the aromatic core content of the gas oil fraction by:
A process for refining or upgrading a petroleum hydrocarbon feed in which the feed is passed to a catalytic cracking unit and converted to cracked products including upgraded hydrocarbon materials, wherein discrete samples of the feed passing to the catalytic cracking unit are taken at intervals and each analyzed, and a signal representative of the amounts of polar components and aromatic components having at least 3 rings ("3+-ring aromatics") is generated, and the feed is either blended with a higher quality feed or subjected to a catalytic hydrogenation treatment or both blended and catalytically hydrogenated if and/or when said signal corresponds to amounts of 3+-ring aromatic components and polar components in excess of predetermined amounts, the intensity of said catalytic hydrogenation treatment being increased and decreased with respective increases and decreases in the magnitude of the said signal, the analysis comprising quantifying the aromatic core content of the feed by:
A process for refining and upgrading a petroleum hydrocarbon feed containing undesirable contaminating components selected from asphaltenic materials, aromatic components containing at least three conjugated aromatic rings ("3+aromatics"), polar components and mixtures comprising at least two of said contaminating components, comprising the steps of mixing a stream of a selective refining agent at selected mixture:
Dependencies are inferred from the claim text.