Method for determining hydrocracking tail oil property by near-infrared spectroscopy

A technology of hydrocracking tail oil and near-infrared spectroscopy, which is applied in the field of near-infrared spectroscopy analysis, can solve problems such as lag, long conventional analysis time, and large fluctuations in properties of hydrocracking tail oil, and achieve the effect of easy maintenance

Active Publication Date: 2016-10-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Due to the influence of changes in the raw materials processed by the refinery, the properties of hydrocracking tail oil fluctuate greatly, and the corresponding conventional analysis takes a long t

Method used

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  • Method for determining hydrocracking tail oil property by near-infrared spectroscopy
  • Method for determining hydrocracking tail oil property by near-infrared spectroscopy
  • Method for determining hydrocracking tail oil property by near-infrared spectroscopy

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0042] (1) Establish library sample near-infrared spectrum matrix and database

[0043] 150 hydrocracking tail oil samples were taken, and the composition of each sample was determined by GC-MS method, including normal paraffins, isoparaffins, aromatics and naphthenes. Then measure its near-infrared spectrum, perform first-order differential processing on the near-infrared spectrum, and then carry out vector normalization processing according to formula ⑤.

[0044] Take 5500cm -1 ~6500cm -1 The absorbance of the above-mentioned first-order differential processing and vector normalization processing in the interval constitutes the near-infrared spectrum matrix of the hydrocracking tail oil storage sample, and the spectral data in the near-infrared spectral matrix is ​​related to the corresponding sample properties, and the near-infrared spectral database of the storage sample is established .

[0045] (2) Predict the properties of the samples to be tested

[0046] Perform p...

example 2

[0053] Take 6 hydrocracking tail oil samples to be tested, measure their near-infrared spectra according to the method in Example 1, calculate the Euclidean distance from the spectral data and the scores of the library samples, and then predict the properties of the 6 nearest library samples The properties of the sample to be tested, the comparison between the predicted n-alkane and isoparaffin content and the measured value obtained by the GC-MS standard method (SH / T 0606-2005) is shown in Table 3, and the predicted naphthene and aromatic content are compared with those obtained by using The comparison of the measured values ​​obtained by the GC-MS standard method is shown in Table 4. The comparison between the predicted density and the measured value obtained by the standard density (SH / T0604-2000) measurement method is shown in Table 5.

[0054] table 3

[0055]

[0056] Table 4

[0057]

[0058] table 5

[0059]

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Abstract

The invention relates to a method for determining hydrocracking tail oil property by near-infrared spectroscopy. The method comprises the following steps: a group of hydrocracking tail oil samples is collected, property of the hydrocracking tail oil samples can be determined by a standard method, absorbance of a 5500 cm<-1>-6500 cm<-1> characteristic spectrum zone is taken to establish the near infrared spectroscopy matrix of a hydrocracking tail oil database sample, analysis is carried out on the main components of the matrix, and the score matrix and the load matrix of the database sample are obtained, the absorbance of a 5500 cm<-1>-6500 cm<-1> characteristic spectrum zone of the hydrocracking tail oil sample to-be-measured is taken, the near infrared spectroscopy data of the sample to-be-measured is obtained, the score of the sample to-be-measured is calculated by the load matrix of the database sample, distance between the score of the sample to-be-measured and the score of the each database sample can be calculated one by one, the database samples with s quantity having minimum score difference of the hydrocracking tail oil sample to-be-measured are selected, and the property of the sample to-be-measured is calculated according to the property of the database samples. The method can rapidly and accurately predict the property of the hydrocracking tail oil, the database sample is in an opening state, and the maintenance is simpler.

Description

technical field [0001] The invention is a near-infrared spectrum analysis method for oil properties, specifically, a method for predicting the properties of hydrocracking tail oil by using the near-infrared spectrum method. Background technique [0002] Petrochemical industry is an important pillar industry for the development of the national economy, and the output of ethylene reflects the development level of a country's petrochemical industry. In order to increase the yield of ethylene, many olefin manufacturers have introduced the SPYRO model for optimizing steam cracking operation and advanced process control system (APC) to optimize and control steam cracking operation. In recent years, the production scale of major domestic ethylene enterprises has continued to expand. Correspondingly, the yield of crude oil light oil is low, and refining units are competing for some light raw materials. All of these determine that steam cracking raw materials continue to diversify to...

Claims

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Application Information

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IPC IPC(8): G01N21/359G01N21/3577
Inventor 许育鹏褚小立
Owner CHINA PETROLEUM & CHEM CORP
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