PROCESSES AND SYSTEMS FOR CHARACTERIZING AND BLENDING REFINERY FEEDSTOCKS
First Claim
1. A method for optimizing blends of refinery feedstock, comprising:
- providing a plurality of refinery feedstock samples with each feedstock sample being representative of a feedstock stream to the refinery and having a molecular association characteristic as a function of temperature;
obtaining measurements from the refinery feedstock samples to quantify the molecular association characteristic of the samples as a function of temperature by any of electrical resistivity measurement, vibrational spectroscopic analysis, voltammetry, electrochemical impedance spectroscopy, crystal microbalance measurements of weight changes, and combinations thereof;
providing a database containing measurements correlating molecular association characteristics of the refinery feedstock samples as a function of temperature with known corrosion performance of a plurality of reference refinery feedstock samples;
using the measurements correlating molecular association characteristics of the refinery feedstock samples and the database containing measurements correlating molecular association characteristics with corrosion performance of the reference refinery feedstock samples to obtain an optimized feedstock blend having desired measurements correlating with an acceptable corrosion performance.
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Abstract
A method for characterizing and optimizing refinery feedstock blends according to their corrosivity is provided. Refinery feedstocks can be characterized based on any of: dissociation of acids in the crude, breakup of naphthenic acid molecular associations, mass changes of carbon steel samples, and/or dissociation of sulfur compounds in the feedstocks. The characterization is performed as a function of temperature via any of electrical resistivity measurement, vibrational spectroscopic analysis, voltammetry, electrochemical impedance spectroscopy, crystal microbalance measurements of weight changes, and combinations thereof. The method employs models and/or hardware to optimize the usage of refinery feedstocks in the blending and valuation of the feedstocks.
65 Citations
26 Claims
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1. A method for optimizing blends of refinery feedstock, comprising:
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providing a plurality of refinery feedstock samples with each feedstock sample being representative of a feedstock stream to the refinery and having a molecular association characteristic as a function of temperature; obtaining measurements from the refinery feedstock samples to quantify the molecular association characteristic of the samples as a function of temperature by any of electrical resistivity measurement, vibrational spectroscopic analysis, voltammetry, electrochemical impedance spectroscopy, crystal microbalance measurements of weight changes, and combinations thereof; providing a database containing measurements correlating molecular association characteristics of the refinery feedstock samples as a function of temperature with known corrosion performance of a plurality of reference refinery feedstock samples; using the measurements correlating molecular association characteristics of the refinery feedstock samples and the database containing measurements correlating molecular association characteristics with corrosion performance of the reference refinery feedstock samples to obtain an optimized feedstock blend having desired measurements correlating with an acceptable corrosion performance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 25)
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16. A method for optimizing blends of refinery feedstock, comprising:
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providing a plurality of refinery feedstock samples with each feedstock sample being representative of a feedstock stream to the refinery; obtaining spectroscopic measurements as a function of temperature for the plurality of refinery feedstock samples; blending the feedstock samples in pre-determined proportions to form a feedstock blend; obtaining spectroscopic measurements as a function of temperature for the feedstock blend; comparing the spectroscopic measurements of the feedstock blend to a pre-determined spectroscopic measurements; and adjusting the proportions of the feedstock samples so that the spectroscopic measurements of the feedstock blend are comparable to the pre-determined spectroscopic measurements. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A method for optimizing blends of refinery feedstock, comprising:
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providing a plurality of refinery feedstock samples with each feedstock sample being representative of a feedstock stream to the refinery; performing impedance measurements as a function of temperature for each of the feedstock samples; providing a database correlating impedance measurements with known corrosion performance of reference refinery feedstock; using the impedance measurements of the refinery feedstock samples and the database correlating impedance measurements with corrosion performance of reference refinery feedstock to obtain a feedstock blend having desired impedance measurements correlating with an acceptable corrosion performance. - View Dependent Claims (24)
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26. A method for optimizing blends of refinery feedstock, comprising:
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providing a plurality of refinery feedstock samples with each feedstock sample being representative of a feedstock stream to the refinery; obtaining measurements of mass changes of samples immersed in each of the plurality of feedstock samples over a period of time over a temperature ranging from ambient to 750°
F., wherein the measurements are conducted using a quartz crystal microbalance (QCM);providing a database correlating measurements of mass changes of samples in reference refinery feedstock conducted using QCM with known corrosion performance; using the measurements of mass changes from the refinery feedstock samples and the database correlating the measurements correlating mass changes with corrosion performance of the reference refinery feedstock to obtain an optimized feedstock blend having desired measurements correlating with an acceptable corrosion performance.
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Specification