Method for evaluating stability of heavy residuum
A heavy residue and stability technology, applied in the direction of color/spectral characteristic measurement, etc., to achieve the effect of small experimental operation difficulty, wide application range, and convenient use
Active Publication Date: 2013-07-31
PETROCHINA CO LTD +1
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Problems solved by technology
[0006] The purpose of the present invention is to provide a method for evaluating the stability of heavy residue oil, to solve the problem of heavy oil stability measurement
Method used
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Embodiment 1
[0022] In order to investigate the effect of this test method, the experiment used residual oil B, residual oil C, residual oil D, and residual oil E to conduct experiments. The temperature of the oil bath was set at 110°C, the reflux time was 2 hours, and the test was left standing for 1 hour. Pour the sample into a cuvette, cover it, and scan it with a Cary-50 ultraviolet spectrophotometer every 30 seconds for 15 minutes. The obtained light transmittance value is processed by formula (1). The experimental results are shown in Table 1.
[0023] Table 1 HRS values of four kinds of residual oil stability
[0024]
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The invention relates to a method for evaluating stability of heavy residuum. The method comprises steps of: mixing a heavy residuum sample with toluene according to a mass ratio of 1:9; adding n-heptane according to a volume ratio of 0.5-3:10 into a mixed solution of heavy residuum sample and toluene after standing; shaking violently for seconds; dumping into a drying clean colorimetric ware rapidly; covering; scanning by a UV spectrophotometer to determine light transmittance of the solution; selecting UV visible light with a wavelength of 740nm as a scan spectrum; processing an obtained light transmittance value by a formula (1), wherein HRS represents stability value, and Ti represents light transmittance of single scan, and T represents average light transmittance of scan, and n represents scan frequency. The larger the values above are, the more stable the colloid structure of the oil product when environment changes. The experimental operation has little difficulty, is beneficial for on-site workers and provides guidance for oil product processing.
Description
technical field [0001] The invention relates to a method for evaluating the stability of heavy residual oil. Background technique [0002] Nowadays, it is generally believed that petroleum is a colloidal structure, that is, asphaltene is used as the glue nucleus, aromatic components and colloids have a protective effect on it, and saturated components have a destructive effect on its stable structure. The stability of heavy oil and residual oil will affect the subsequent oil processing, and may cause troubles to subsequent production, such as excessive coalescence and deposition of asphaltene, which will be separated from the oil to form a second liquid phase, and Further coking will cause catalyst deactivation, pipeline blockage, and great difficulties in production and processing. [0003] Generally, residual oil and heavy oil are well soluble in polar toluene, but not in non-polar small molecule normal alkanes. Based on this phenomenon, the research on the stability of ...
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IPC IPC(8): G01N21/33
Inventor 王宗贤郭爱军刘东沐宝泉张蕾蕾付兴国于志敏侯经纬赵广辉
Owner PETROCHINA CO LTD