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 electrochemical impedance spectroscopy (EIS) at 10 kHZ frequency;
providing a database containing EIS 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 EIS measurements correlating molecular association characteristics of the refinery feedstock samples and the database containing EIS measurements correlating molecular association characteristics with corrosion performance of the reference refinery feedstock samples to obtain an optimized feedstock blend having desired EIS 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.
123 Citations
19 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 electrochemical impedance spectroscopy (EIS) at 10 kHZ frequency; providing a database containing EIS 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 EIS measurements correlating molecular association characteristics of the refinery feedstock samples and the database containing EIS measurements correlating molecular association characteristics with corrosion performance of the reference refinery feedstock samples to obtain an optimized feedstock blend having desired EIS measurements correlating with an acceptable corrosion performance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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 using electrochemical impedance spectroscopy (EIS) at 10 kHz frequency 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 EIS measurements as a function of temperature for the feedstock blend; comparing the EIS measurements of the feedstock blend to a pre-determined EIS measurements; and adjusting the proportions of the feedstock samples so that the EIS measurements of the feedstock blend are comparable to the pre-determined EIS measurements. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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19. 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 at 10 kHz frequency 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.
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Specification