Method for predicting hydrocarbon process stream stability using near infrared spectra

A near-infrared spectroscopy, process flow technology, applied in the field of predicting the stability of hydrocarbon process flow, can solve problems such as limiting the ability to optimize cracking treatment, achieve the effect of less skills and training, optimize cracking process, and reduce the amount of time

Active Publication Date: 2014-12-24
NALCO CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition to being time-consuming, this method has the disadvantage that it requires multiple dilutions of the sample, each diluted by titration with n-heptane solvent for evaluation
These methods also significantly limit the ability to optimize the cracking process, especially with frequent changes in the type of crude oil in the feed

Method used

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  • Method for predicting hydrocarbon process stream stability using near infrared spectra
  • Method for predicting hydrocarbon process stream stability using near infrared spectra
  • Method for predicting hydrocarbon process stream stability using near infrared spectra

Examples

Experimental program
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example 1

[0041] For a series of 24 vistar samples, "stability" and NIR spectra were determined using accepted standard methods. Using partial least squares statistical methods, correlation models were derived between standard stability measurements and absorbance measurements in selected regions of the NIR spectrum. The model was validated using a cross-validation technique in which one sample at a time was excluded from the correlation model and predicted from the correlation.

[0042] For the purposes of this illustration, the publication titled "Standard Test Method for Determining the Intrinsic Stability of Asphaltene-Containing Residues, Heavy Fuel Oils, and Crude Oils (N-Heptane Phase Separation; Optical Detection) ( Standard Test Method for Determination of Intrinsic Stability of Asphaltene-Containing Residues, Heavy Fuel Oils, and Crude Oils (n-Heptane Phase Separation; Optical Detection))" to determine the stability of a series of vistar samples. The method assumes a model of...

example 2

[0047] This example is a model for predicting stability based on a partial least squares analysis of 24 "vistar" samples using the technique described in Example 1. The region of the NIR spectrum covered by this model includes 6102 to 5446 cm -1 and 4601 to 4247cm -1 , and use 7 main components. This component is a statistically orthogonal variable derived from the PLS analysis. The statistical parameters of the model are R 2 = 0.948 and RMSEV = 0.0423. Representative results for three samples are shown in Table 1.

[0048] Table 1

[0049] Actual "S" Stability

example 3

[0051] In principle, the described system can be adapted for on-line monitoring. A side stream from the cleaved vistar bottoms can be fed to a monitoring unit where NIR spectroscopy can be measured. The computer system will compare vistar spectra to correlation models and calculate predicted stability results. This result can be transmitted to the control system and manipulated manually, or integrated into a control mechanism whereby, based on this result, the severity of the pyrolysis process will be increased or decreased. A similar on-line system can be used to monitor the feed to the device to automatically determine the specific calibration model for this mode of operation. Alternatively, pyrolysis can also be determined by taking a grab sample of the feedstock to be analyzed and manually selecting the correlation model for the vistar analysis, since the feedstock only needs to be tested each time the feedstock is changed A drastic desired increase or decrease.

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Abstract

A method of predicting the stability of a hydrocarbon process stream is disclosed and claimed. The method includes obtaining samples from one or more process streams and measuring the actual stability and the near infrared spectral absorbance of those samples. A classification model is initially developed to identify sample subsets and correlation model is created using the stability and absorbance data by inserting that data into a mathematical function. Online or offline measurements are then taken from the hydrocarbon process stream, the classification model is used initially to identify the subset and corresponding correlation model is used to predict the stability of the stream.

Description

technical field [0001] The present invention generally relates to predicting hydrocarbon process stream stability. More specifically, the invention relates to creating a correlation model to predict hydrocarbon process stream stability using near infrared absorbance. The present invention is particularly relevant to predicting hydrocarbon process stream stability by measuring near infrared absorbance and comparing the measured absorbance against a correlation model. Background technique [0002] Crude oil typically contains hundreds of thousands of compounds. A commonly used simplified analytical system divides these compounds into four groups according to their solubility. This system is called "SARA" analysis, where the groups are Saturates, Aromatics, Resins and Asphaltenes. The least soluble of these groups are asphaltenes, which are stabilized with resins and / or aromatics, but unstable with saturated hydrocarbons. Asphaltenes are usually present in nanoscale stable ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/359G01N21/3577G01N33/28
CPCG01N33/28G01N21/359G01N21/3577G01N2291/0226
Inventor R·萨普
Owner NALCO CO
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