Method for measuring content of dialkene in gasoline through spectrum of near infrared light

A technology of near-infrared spectroscopy and diolefins, applied in the direction of color/spectral characteristic measurement, measurement devices, and material analysis through optical means, can solve problems such as inappropriate online analysis applications, and achieve real-time monitoring, accurate prediction, and operation convenient effect

Active Publication Date: 2006-07-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Zhang Jizhong et al. used mid-infrared spectroscopy to predict the diene value of light oil products (Petrochemical Industry, 2004, Vol. Analytical testing instruments are more expensive, and are more suitable for testing and analyzing the diene value of oil products in the laboratory, but not suitable for on-line analysis in the operation of the device

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  • Method for measuring content of dialkene in gasoline through spectrum of near infrared light
  • Method for measuring content of dialkene in gasoline through spectrum of near infrared light
  • Method for measuring content of dialkene in gasoline through spectrum of near infrared light

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example 1

[0132] Establish and verify the calibration model of long-wave near-infrared spectroscopy.

[0133] (1) Determination of diene value content by standard method: collect 89 cracked ethylene gasoline samples from ethylene cracking unit, and use UOP-326 method to measure the diene value. Collect 66 representative samples to form the calibration set.

[0134] (2) Establish a calibration model with the samples in the calibration set: use a Bomem 160 long-wave near-infrared spectrometer (produced by Bomem, Canada) to measure the long-wave near-infrared spectrum of the samples in the calibration set. The measurement method is as follows: pour the test sample into a quartz sample absorption cell with an optical path length of 5 mm, put it in the sample cell holder for 2 minutes, and then scan the spectrum with air as a reference, and the number of scans is 16 times. Spectrum collection range: 10000~5000cm -1 ; Resolution: 4cm -1 . The measurement time for each sample was 3 minutes...

example 2

[0139] The correction model of short-wave near-infrared spectroscopy was established and verified.

[0140] (1) Determination of diene value content by standard method: collect 89 cracked ethylene gasoline samples from ethylene cracking unit, and use UOP-326 method to measure the diene value. Collect 66 representative samples to form the calibration set.

[0141] (2) Establish a calibration model using the calibration set samples: NIR-3000 short-wave near-infrared spectrometer (produced by Beijing Yingxian Instrument Co., Ltd.) measures the short-wave near-infrared spectrum of the calibration set samples. The measurement method is as follows: pour the test sample into a glass sample absorption cell with an optical path of 50 mm, put it in the sample cell rack for 3 minutes, and then scan the spectrum with air as a reference. The number of scans is 12; the temperature of the instrument is 37 ° C, The temperature of the sample cell is 25°C. Spectrum collection range: 700~1100n...

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Abstract

The invention is a method for determining the diolefin content of gasoline with near infrared spectrum, comprising the steps of: (1) collecting various gasoline samples; (2) determining their diolefin contents by standard method, determining their near infrared spectrums, selecting the absorbed light obtained by second-order differentiation in a 5600í½6400cm -1 or 850í½1000nm wave band of each spectrum to be related with its diolefin content determined by standard method, and adopting partial least square to establish a correcting model; (3) determining the near infrared spectrum of a to-be-determined gasoline sample, selecting and substituting the absorbed light obtained by second-order differentiation in a 5600í½6400cm -1 or 850í½1000nm wave band of the near infrared spectrum of the to-be-determined gasoline sample into the correcting model and obtaining the diolefin content of the to-be-determined gasoline sample. The method is convenient to operation, and accurate and quick to analyze.

Description

technical field [0001] The invention relates to a method for determining the content of diolefins in gasoline by using near-infrared spectroscopy, specifically, a method for predicting the content of conjugated diolefins in gasoline samples by using near-infrared spectroscopy. Background technique [0002] Conjugated dienes are contained in secondary processed gasoline such as pyrolysis gasoline, catalytic cracking gasoline and coker gasoline. The presence of conjugated dienes will seriously affect the stability of the oil. For example, in the storage and transportation of refined oil, especially in the storage of combat readiness oil, the content of dienes is one of the important factors affecting the long-term stability of oil products. In the etherification process of catalytic cracking gasoline, diolefins are easy to polymerize, and the formed polymers are deposited on the surface of the catalyst or block its pores, resulting in catalyst deactivation. In the ethylene i...

Claims

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Application Information

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IPC IPC(8): G01N21/35G06F19/00G01N21/3577G01N21/359G06F17/16
Inventor 张继忠袁洪福王京华褚小立
Owner CHINA PETROLEUM & CHEM CORP
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