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Method for predicting composition of mixed crude oil through near-infrared spectroscopy of crude oils

A technology of near-infrared spectroscopy and crude oil, applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve the problems of cumbersome modeling process, etc., and achieve the effect of simple method, less calculation amount and strong practicability

Active Publication Date: 2018-05-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] However, in practical applications, since this method needs to establish a multivariate calibration model based on the mixed simulated spectrum using a chemometric method, the modeling process is relatively cumbersome, and many modeling parameters need to be optimized and selected, such as the number of partial least squares principal factors, etc. Therefore, the application of this method is largely limited

Method used

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  • Method for predicting composition of mixed crude oil through near-infrared spectroscopy of crude oils
  • Method for predicting composition of mixed crude oil through near-infrared spectroscopy of crude oils
  • Method for predicting composition of mixed crude oil through near-infrared spectroscopy of crude oils

Examples

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Effect test

example 1

[0042] Determination of the blending ratio of paraffin base crude oil A and intermediate base crude oil B.

[0043] The paraffin base crude oil A and the intermediate base crude oil B are blended at 35% and 65% (mass ratio) to obtain the mixed crude oil F.

[0044] (1) Determination of near-infrared spectra of single crude oil and mixed crude oil

[0045] Collect the near-infrared spectra of crude oil A, crude oil B and mixed crude oil F, and perform second-order differential processing on the near-infrared spectra of crude oil A, crude oil B and mixed crude oil F respectively, and take 4000-5000cm -1 And 5000~6500cm -1 The absorbance of the two intervals.

[0046] (2) Calculate the polar coordinate projection score of the spectrum

[0047] According to the formulas ① and ②, respectively calculate crude oil A, crude oil B and mixed crude oil F at 4000~5000cm -1 And 5000~6500cm -1 Polar projection scores for two spectral bins.

[0048] Four polar coordinate projection sco...

example 2

[0057] Determination of blending ratio of intermediate base crude oil A and intermediate base B crude oil.

[0058] The intermediate base crude oil B and the intermediate base G are blended at 35% and 65% (mass ratio) to obtain the mixed crude oil F.

[0059] Measure the near-infrared spectrum of single crude oil and mixed crude oil according to the method of example 1 (1), (2) steps, after carrying out second-order differential treatment, take 4000~5000cm -1 And 5000~6500cm -1 Calculate the polar coordinate projection score of the absorbance of the two spectral intervals.

[0060] Four polar coordinate projection scores obtained for a single crude oil A and They are: -0.0113, 0.0383, -0.1030, 0.3481.

[0061] The four polar coordinate projection scores obtained for a single crude oil B and They are: -0.0117, 0.0401, -0.0372, 0.1638.

[0062] The four polar coordinate projection scores obtained by blending crude oil F and They are: -0.0115, 0.0394, -0.0619...

example 3

[0069] Determination of blending ratio of intermediate base crude oil A, intermediate base crude oil B and paraffin base crude oil C.

[0070] The intermediate base crude oil A, the intermediate base crude oil B and the paraffin base crude oil C are blended according to 35%, 40% and 25% (mass ratio) to obtain the mixed crude oil F.

[0071] Measure the near-infrared spectrum of a single crude oil and the mixture according to the method of example 1 (1), (2), after carrying out the second-order differential treatment, take 4000~5000cm -1 And 5000~6500cm -1 Calculate the polar coordinate projection score of the absorbance of the two spectral intervals.

[0072] Four polar coordinate projection scores obtained for a single crude oil A and They are: -0.0118, 0.0399, -0.0703, 0.2377.

[0073] The four polar coordinate projection scores obtained for a single crude oil B and They are: -0.0093, 0.0315, -0.0173, 0.0584.

[0074] Four polar coordinate projection scores ob...

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Abstract

The invention relates to a method for predicting the composition of mixed crude oil through near-infrared spectroscopy of crude oils. The method comprises: (1) respectively determining the near-infrared spectrums of single-crude-oils and mixed crude oil, carrying out second-order differential treatment, and calculating the polar coordinate projecting scores of the absorbance of each single-crude-oil and the mixed crude oil at two spectral regions such as W1 of 4000-5000 cm<-1> and W2 of 5000-6500 cm<-1>; and (2) combining the polar coordinate projecting scores of all the single-crude-oils to form a matrix X, combing the polar coordinate projecting scores of the mixed crude oil according to the same polar coordinate projecting score aligning order as the matrix X to form a vector y, substituting the y into the following formula y=bX, and calculating the vector b by using a non-negative constrained least-square method, wherein the vector B is recorded as b<inverted v>, and is the contents of each single-crude-oil contained in the mixed crude oil. According to the present invention, the method has advantages of simple calculation process, rapid predicting and strong practicality.

Description

technical field [0001] The invention is a method for predicting the composition of mixed crude oil by near-infrared spectrum, specifically, a method for predicting the content of each single crude oil contained in mixed crude oil by near-infrared spectrum. Background technique [0002] With the continuous growth of market demand for oil products and the shortage of domestic crude oil resources, refineries are processing more and more imported crude oil and marine crude oil, and the types of processing are increasing. , Crude oil blending is common. Reasonable blending of crude oil can not only increase the extraction rate, but also, when the properties of a crude oil are not suitable for equipment, it can be improved by blending crude oil to increase the processing capacity and improve product quality. Therefore, it is necessary to determine the proportion of blended crude oil in time and accurately before entering the distillation unit. In addition, in the process of crud...

Claims

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Application Information

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IPC IPC(8): G01N21/359G01N21/3577
CPCG01N21/3577G01N21/359
Inventor 褚小立陈瀑许育鹏李敬岩
Owner CHINA PETROLEUM & CHEM CORP
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