{"id":35436,"date":"2020-12-11T12:19:18","date_gmt":"2020-12-11T12:19:18","guid":{"rendered":"https:\/\/scioninstruments.com\/methanol-in-crude-oil-analysis-according-to-astm-d7059-04\/"},"modified":"2024-02-08T13:25:09","modified_gmt":"2024-02-08T13:25:09","slug":"methanol-in-crude-oil-analysis-according-to-astm-d7059-04","status":"publish","type":"page","link":"https:\/\/scioninstruments.com\/us\/methanol-in-crude-oil-analysis-according-to-astm-d7059-04\/","title":{"rendered":"Methanol in Crude Oil Analysis According to ASTM D7059-04"},"content":{"rendered":"<h2>Instrument Type<img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" class=\"alignright wp-image-38506 size-medium\" src=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2021\/03\/Oil-droplet-300x171.png\" alt=\"ASTM D7059-04: Methanol in Crude Oil Analysis \" width=\"300\" height=\"171\" srcset=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2021\/03\/Oil-droplet-300x171.png 300w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2021\/03\/Oil-droplet-768x438.png 768w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2021\/03\/Oil-droplet.png 790w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/h2>\n<p>SCION Instruments GC-based Analyser<\/p>\n<h2>Description<\/h2>\n<p>The analysis of methanol in crude oil according to<strong> ASTM D7059<\/strong>: \u201cStandard Test Method for Determination of Methanol in Crude Oils by Multidimensional Gas Chromatography.\u201d In the production of crude oil, methanol is often added to prevent formation of hydrates (i.e., solid water-hydrocarbon structures) that block transportation via pipelines. However, methanol, as with most oxygenated components, will poison catalysts when the crude oil is converted into other products. Catalysts are very expensive, and high methanol levels add a big cost factor. Therefore, the content of methanol in a crude oil is very important and must be measured accurately at low (ppm) concentrations. Depending on the methanol level, the crude oil can be applied straight or needs extra treatment(s) to reduce the methanol content. The determination of methanol is done via an internal standard method using 1- propanol as the internal standard. The measuring range of methanol is specified from 15 to 900 ppm (m\/m).<\/p>\n<h2>Configuration<\/h2>\n<p>The system is a SCION SSL capillary split\/splitless injector using a pressure point over the precolumn. The heavy components of the crude oil are backflushed over a filter to prevent blockage of the vent line. The configuration can be seen in Figure 1 below.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-31411\" src=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-1-201x300.png\" alt=\"Methanol in crude oil - ASTM D7059\" width=\"302\" height=\"450\" srcset=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-1-201x300.png 201w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-1.png 292w\" sizes=\"auto, (max-width: 302px) 100vw, 302px\" \/><br \/>\n<em><span style=\"color: #1b66b1;\">Figure 1.<\/span> Schematic overview of the configuration<\/em><\/p>\n<h2>System Settings &#8211; GC-FID Analytical Conditions<\/h2>\n<p><img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-31417\" src=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/System-Settings-Table1-300x125.jpg\" alt=\"ASTM D7059 Instrument Conditions\" width=\"499\" height=\"208\" srcset=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/System-Settings-Table1-300x125.jpg 300w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/System-Settings-Table1-768x320.jpg 768w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/System-Settings-Table1.jpg 777w\" sizes=\"auto, (max-width: 499px) 100vw, 499px\" \/><br \/>\n<em><span style=\"color: #1b66b1;\">Table 1.<\/span> Analytical conditions of the GC-FID<\/em><\/p>\n<h2>Results<\/h2>\n<p>The chromatograms of methanol in toluene, at 150ppm and 6ppm, test mix can be found in Figures 2 and 3.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-31423\" src=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-2-e1586868852622.png\" alt=\"Methanol in Toluene - ASTM D7059\" width=\"500\" height=\"342\" srcset=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-2-e1586868852622.png 850w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-2-e1586868852622-300x205.png 300w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-2-e1586868852622-768x525.png 768w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><br \/>\n<em><span style=\"color: #1b66b1;\">Figure 2.<\/span> Test mixture of 150ppm methanol in toluene<\/em><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-31429\" src=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-3-e1586869462507.png\" alt=\"\" width=\"500\" height=\"342\" srcset=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-3-e1586869462507.png 850w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-3-e1586869462507-300x205.png 300w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-3-e1586869462507-768x525.png 768w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><br \/>\n<em>F<span style=\"color: #1b66b1;\">igure 3.<\/span> Test mixture of 6ppm methanol in toluene<\/em><\/p>\n<h2>System Linearity<\/h2>\n<p>The linearity of the system was determined by a series of samples in toluene where the methanol concentration ranged between 1 and 1000 ppm. The internal standard concentration is set at a constant level. The linearity is shown by plotting the response ratio of the methanol and internal standard against the amount ratio of both components, as shown in Figure 4. The correlation R 2 should 0.99 or better.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-31435\" src=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-4-e1586869659916.png\" alt=\"\" width=\"500\" height=\"342\" srcset=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-4-e1586869659916.png 850w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-4-e1586869659916-300x205.png 300w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-4-e1586869659916-768x525.png 768w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><br \/>\n<em><span style=\"color: #1b66b1;\">Figure 4.<\/span> Multipoint calibration curve of methanol in toluene<\/em><\/p>\n<h2>LOQ<\/h2>\n<p>The limit of quantification (LOQ) specified as two times the signal noise (i.e. 10 times the standard deviation of the noise) is determined using a 6-ppm methanol standard. The LOQ measured is 1ppm.<\/p>\n<h2>Sample Analysis<\/h2>\n<p>A crude oil sample was doped with low and high concentrations of methanol. Ten sequential analyses were performed for both methanol concentrations with data shown in Table 2. The chromatogram for the low-level and high-level methanol in crude oil is shown in Figures 5 and 6.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-31441\" src=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Table-2.jpg\" alt=\"\" width=\"500\" height=\"411\" srcset=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Table-2.jpg 845w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Table-2-300x247.jpg 300w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Table-2-768x632.jpg 768w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><br \/>\n<em><span style=\"color: #1b66b1;\">Table 2.<\/span> Repeatability data of low and high spiked methanol in crude oil.\u00a0<\/em><\/p>\n<p>* Repeatability = 2.8 * Standard deviation<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-31447\" src=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-6-e1586870303481.png\" alt=\"\" width=\"500\" height=\"342\" srcset=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-6-e1586870303481.png 850w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-6-e1586870303481-300x205.png 300w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-6-e1586870303481-768x525.png 768w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><br \/>\n<em><span style=\"color: #1b66b1;\">Figure 6.<\/span> Low-level methanol in crude oil (doped)<\/em><\/p>\n<h2>Repeatability<\/h2>\n<p>The ASTM method subscribes repeatability that is dependent on the methanol concentration. For 25ppm methanol in crude oil, the maximum repeatability is 5ppm (m\/m) and for 900ppm the maximum repeatability is 60ppm (m.\/m). Figures 7-8 highlight the repeatability of both low and high-level methanol in crude oil according to ASTM specifications.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" class=\"alignnone size-full wp-image-31453\" src=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-7-300x199-1.png\" alt=\"\" width=\"300\" height=\"199\" \/><br \/>\n<em><span style=\"color: #1b66b1;\">Figure 7.<\/span> Repeatability of high-level methanol in crude oil.<\/em><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-31459 size-full\" src=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-8-300x197-1.png\" alt=\"ASTM D7059\" width=\"300\" height=\"197\" \/><br \/>\n<em><span style=\"color: #1b66b1;\">Figure 8.<\/span> Repeatability of low-level methanol in crude oil.<\/em><\/p>\n<h2>PLOQ<\/h2>\n<p>The pooled limit of quantitation (PLOQ) is calculated from the ratio of the mean methanol concentration an its standard deviation for a series of measurements. PLOQ is the concentration where the ratio equals 10. At 25ppm level, the measure value is 41. This means that the PLOQ is below 25ppm. Figure 9 shows the PLOQ.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" loading=\"lazy\" class=\"alignnone wp-image-31465\" src=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-9-e1586870893426.png\" alt=\"ASTM D7059\" width=\"500\" height=\"342\" srcset=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-9-e1586870893426.png 850w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-9-e1586870893426-300x205.png 300w, https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/Figure-9-e1586870893426-768x525.png 768w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><br \/>\n<em><span style=\"color: #1b66b1;\">Figure 9.<\/span> Determination of the PLOQ \u2013 below 25ppm.<\/em><\/p>\n<h2>Conclusion<\/h2>\n<p>The analysis of methanol in crude oil using a SCION Split\/splitless injector and a pressure point for a back-flush configurations gives analytical results that are well within the ASTM D7059 subscribed specifications.<\/p>\n<h2>Download Application Note<\/h2>\n<p>Download the complete Application Note: <a href=\"https:\/\/scioninstruments.com\/wp-content\/uploads\/2020\/11\/AN_0069-Methanol-in-Crude-Oil-Analysis-ASTM-D7059-04-1.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Methanol in Crude Oil Analysis According to ASTM D7059-04<\/a><\/p>\n<h2>SCION Gas Chromatography Analyser<\/h2>\n<p>Our Gas Chromatography Analyser was used to conduct this research. Providing excellent solutions for Environmental, Oil and Gas and Chemical industries, find out more about <a href=\"https:\/\/scioninstruments.com\/types\/scion-gc-analysers\/\"><span style=\"text-decoration: underline;\">Scion GC Analysers<\/span><\/a>. Alternatively if you would like to discuss any specific requirements you may have simply <a href=\"https:\/\/scioninstruments.com\/contact-us\/\"><span style=\"text-decoration: underline;\">contact us<\/span><\/a>. We look forward to being of assistance.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Instrument Type SCION Instruments GC-based Analyser Description The analysis of methanol in crude oil according to ASTM D7059: \u201cStandard Test Method for Determination of Methanol in Crude Oils by Multidimensional Gas Chromatography.\u201d In the production of crude oil, methanol is often added to prevent formation of hydrates (i.e., solid water-hydrocarbon structures) that block transportation via [&hellip;]<\/p>\n","protected":false},"author":15,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-35436","page","type-page","status-publish","hentry"],"acf":{"rf_hero_height":"default","rf_hero_type":"default","rf_hero_vertpos":"50","rf_hero_horizpos":"50","rf_hero_title":"","rf_hero_textcol":"light","rf_hero_bgcol":"white","rf_hero_tint":false,"rf_hero_title_hide":false,"rf_further_reading_posts":false},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Methanol in Crude Oil Analysis According to ASTM D7059-04 | SCION Instruments<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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