Method for rapid determination of methanol and ethanol content of alcohol gasoline
A methanol ethanol and content technology, which is applied in the field of chemometrics, can solve the problems of difficult to achieve rapid measurement, difficult to distinguish between alcohol gasoline methanol and ethanol, complicated operation, etc., and achieves rapid and effective detection means, calibration samples are reduced, and analysis accuracy is high. Effect
Active Publication Date: 2012-11-21
ZHEJIANG UNIV
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Problems solved by technology
However, the fractional distillation method has complex equipment and cumbersome operation, while the gas chromatography method has complicated sample pretreatment and requires internal standards. Both methods require a long measurement cycle and it is difficult to achieve rapid measurement.
The spectral detection technology represented by near-infrared spectroscopy is a fast and non-destructive detection method, but due to the molecular absorption characteristics of near-infrared spectroscopy, it is difficult to distinguish methanol and ethanol in alcohol gasoline; Raman spectroscopy can correctly distinguish alcohol and alcohol gasoline. methanol and ethanol
However, the traditional Raman spectral modeling method needs to collect a large number of gasoline samples with different base oils and different methanol and ethanol contents, and the modeling work is complicated; and for new base oils, it is necessary to remodel or expand the training sample set
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[0058] Example test hardware platform: US Ocean Corporation MAYA2000Pro spectrometer is used to measure the Raman spectrum data of gasoline samples, and the measurement range of the spectrum is 319-2470cm -1 ; The central wavelength of the laser is 785nm; the sampling pool is a 10mm quartz cuvette.
[0059] Example test sample distribution: This example test sample comes from 3 different batches of alcohol gasoline in a refinery, with 7 samples in each batch, and a total of 21 samples. The samples from different batches were recorded as groups a, b, and c respectively, and the specific methanol and ethanol content of each sample is shown in Table 1.
[0060] Table 1 example test sample methanol ethanol content
[0061]
[0062] 1. Measure the Raman spectra of anhydrous methanol and anhydrous ethanol, such as figure 1 , figure 2 shown. Preprocessed methanol and ethanol Raman spectra are obtained after spectral band selection, smoothing and denoising, fluorescence back...
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Abstract
The present invention discloses a method for rapid determination of methanol and ethanol content of alcohol gasoline. The method comprises steps of: first measuring Raman spectrums of anhydrous pure methanol and anhydrous pure ethanol, Raman spectrums of a plurality of gasoline samples with known methanol and ethanol content, and Raman spectrums after addition of a certain amount of methanol into the samples; carrying out a pretreatment on the above Raman spectrums; calculating out a spectral synthesis formula corresponding to the known gasoline samples; storing the pretreated spectrums and synthesis formula parameters of the known gasoline samples in a model database; and for an unknown gasoline sample, measuring the Raman spectrum, carrying out pretreatment, selecting a the most similar known alcohol sample according to the spectrum synthesis formula, and directly calculating methanol and ethanol content of the sample to be measured. The invention applies spectrum synthesis technology to rapid determination of methanol and ethanol content of alcohol gasoline, and has advantages of the rapidness and accuracy; besides, only a small amount of modeling samples is required, so as to greatly reduce workload for model calibration and maintenance.
Description
Technical field [0001] The invention is a chemical metering field, which involves a spectral measurement method that involves a material concentration in a mixture, especially the rapid measurement method of methanol content in a alcohol gasoline. technical background [0002] At present, petroleum resources are increasingly exhausted, and energy prices have risen all the way. At the same time, the problems of environmental pollution are becoming increasingly prominent. Traditional oil fuel gasoline and diesel are used to face great challenges.Develop and use.The physical and chemical properties of alcohol are similar to gasoline and have a wide and rich source of production, so they are regarded as the most promising agency fuel.Alcohol gasoline is prepared by ordinary gasoline, methanol, ethanol, and additives according to a certain proportion.The study of methanol is 107; the study of ethanol research is 108.Therefore, mixing alcohol in gasoline can significantly increase the ...
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IPC IPC(8): G01N21/65
Inventor 姚捷戴连奎张雪菁
Owner ZHEJIANG UNIV
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