- The formation features of C10–C20 regular petroleum isoprenanes
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To model the formation processes of C10–C20 petroleum isoprenanes, thermolysis of regular and irregular C20–C40 isoprenanes (phytane, crocetane, squalane, and lycopane) and the suggested precursors of regular pe
- Gordadze,Giruts,Poshibaeva,Koshelev
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p. 672 - 676
(2016/10/04)
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- Process for hydrogenation of carboxylic acids and derivatives to hydrocarbons
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A process for hydrogenating a carboxylic acid and/or derivative thereof having a carboxylate group represented by the general formula R1COO-, which process comprises feeding hydrogen and the carboxylic acid and/or derivative thereof to a reactor and maintaining conditions within the reactor such that hydrogen reacts with the carboxylic acid and/or derivative thereof to produce a product stream comprising carbon dioxide, carbon monoxide, methane and hydrocarbons represented by general formulae R1H and R1CH3, characterised in that the molar ratio of R1H : R1CH3 is above a pre-determined value and/or the mole ratio of the sum of carbon dioxide, carbon monoxide and methane to carboxylate groups is above a pre-determined value.
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Page/Page column 7-8
(2008/06/13)
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- Pyrolytic formation of C19 isoprenoid hydrocarbons from dihydrophytol: In relation to the genesis of pristane in petroleum
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This study was concluded to elucidate a pathway for formation of C19 isoprenoid hydrocarbons (isops) in petroleum from chlorophylls. C19 isops are predominantly produced when dihydrophytol is heated at 320°C for a period ranging from 1 to 5 h under vacuum while C20 isops are predominantly produced when chlorophyll a or phytol is heated. A radical chain reaction of decomposition of dihydrophytol is proposed as plausible pathway for producing C19 isops.
- Ishiwatari, Mariko,Yamada, Keita,Ishiwatari, Ryoshi
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p. 206 - 207
(2007/10/03)
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- Microbial Oxidation of Isoprenoid Alkanes, Phytane, Norpristane and Farnesane
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Rhodococcus sp.BPM 1613, a pristane oxidizing microorganism, grows on isoprenoid hydrocarbons such as phytane (2,6,10,14-tetramethylhexadecane), norpristane (2,6,10-trimethyl-pentadecane) and farnesane (2,6,10-trimethyldodecane) as the sole carbon source, resulting in accumulation of oxidation products in the culture broth.The oxidation products of phytane, norpristane and farnesane in the respective culture broth were isolated and purified by the use of silica gel column chromatography.Their chemical structures were determined by instrumental analyses such as IR, NMR and mass spectrometry.The oxidation products of phytane were identified as 2,6,10,14-tetramethyl-1-hexadecanol and 2,6,10,14-tetramethylhexadecanoic acid, the product of norpristane as 2,6,10-trimethyl-1-pentadecanol, and that of farnesane as 2,6,10-trimethyl-1-dodecanol.All these oxidation products were either monoalcohols or monocarboxylic acids derived through oxidation of the isopropyl terminus of each alkane.In addition, the relationship between the terminal structure of isoprenoid hydrocarbons and microbial oxidation was explored on the basis of these results.
- Nakajima, Kenji,Sato, Akio,Takahara, Yoshimasa,Iida, Takeo
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p. 1993 - 2002
(2007/10/02)
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