Oxidation of petroleum asphaltenes to aliphatic dicarboxylic and benzene carboxylic acids

Antonishin, V. I.; Gumenetskii, V. V.; Grinenko, B. S.

doi:10.1016/0031-6458(77)90054-5

Cited by 2 publications

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“…is formed during oxidation of asphaltenes by air at elevated temperature and pressure. Oxidation of asphaltenes in aqueous basic solution forms a large number of O-containing products whereas oxidative condensation is held to a minimum [9]. However, the influence of the composition and properties of petroleum asphaltenes on the yield and composition of their oxidation products has not been reported.…”

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confidence: 94%

Composition and Properties of Oxidation Products of Heavy Oil Resid Asphaltenes

Yakubov

Yakubova

Borisov

et al. 2015

Chem Technol Fuels Oils

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Asphaltenes of various heavy oil resids are oxidized by aqueous sodium percarbonate solutions at 200°C and 4 MPa pressure. The composition and properties of the obtained products are analyzed. Water-soluble oxidation products in the asphaltene oxidation products comprise 47.4-49.4%. Products of oxidative condensation of asphaltenes enriched with hydroxyl, ether, and carboxyl groups dominate in the composition of water-insoluble oxidation products. The water-soluble oxidation products represent carboxylic acid concentrate. The characteristics of the structural-group composition of the obtained oxidation products are disclosed. The possibility of practical utilization of asphaltene oxidation products as adhesion additives to road asphalt and for removal of phenol from water is demonstrated.Asphalt-resin concentrates, e.g., hydrones or deasphaltizing resids, can be viewed as feedstock for producing valuable chemicals. As a rule, increased contents of heteroatomic groups increase the reactivity of asphaltenes and resins. Numerous previous studies showed that asphaltenes can be oxidized, halogenated, hydrogenated, sulfated, and chloromethylated to produce analogs of known chemicals [1-3]. 223Asphaltenes K abs 570 nm, cm -1 Content, wt. %

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confidence: 94%

Composition and Properties of Oxidation Products of Heavy Oil Resid Asphaltenes

Yakubov

Yakubova

Borisov

et al. 2015

Chem Technol Fuels Oils

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“…Prepared asphaltene samples were visualized as quickly as possible due to asphaltene's high oxidation features (Antonishin et al 1977). Initially, dried asphaltenes crushed with mortar to make asphaltene particles smaller.…”

Section: Visualizing Asphaltene Behavior Under Optic Microscopementioning

confidence: 99%

Effect of clay and salinity on asphaltene stability

Demir¹

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Asphaltenes are fractions of crude oil and precipitate out due to change in pressure, temperature, and composition. Because the most significant pressure and temperature change occur at near wellbore region, asphaltenes precipitation occurs at this area which prevents oil flow due to significant reduction in permeability. This study investigates the effect of salinity and clay type on asphaltene stability. To reach this goal, the stability of asphaltenes from five different crude oil samples were evaluated after exposing them to different brine concentrations with the absence and presence of porous medium. Porous mediums were prepared by using either Ottawa Sand or Ottawa Sand+Clay mixture. Illite+kaolinite mixture was used as clay. Brine solutions were prepared by either NaCl or CaCl2. For both salts, solutions were prepared by mixing 0.2%, 2%, 4%, 6%, and 8% of salt with deionized water. Asphaltene behavior was visualized for each case under optical microscope. The impact of asphaltene-brine interaction on wettability alteration was determined through contact angle measurements. Our experimental results suggest that asphaltenes from all five crude oil samples are dispersed in water, and they aligned themselves within water due to their polar-polar interaction with water. In asphaltene-clay-brine systems, divalent salt (CaCl2) interacts more with asphaltenes than monovalent salt (NaCl). Further, increasing salinity promotes clay dispersion which increases the size of asphaltene-clay clusters. Also, the contact angle measurements demonstrated that wettability alters with salinity, however, no direct relation was observed between salinity and asphaltene stability. This study aimed to characterize the stability of asphaltenes from five different crude oils. Based on crude oils which may aid to produce methods to prevent asphaltenes deposition.

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Oxidation of petroleum asphaltenes to aliphatic dicarboxylic and benzene carboxylic acids

Cited by 2 publications

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Composition and Properties of Oxidation Products of Heavy Oil Resid Asphaltenes

Composition and Properties of Oxidation Products of Heavy Oil Resid Asphaltenes

Effect of clay and salinity on asphaltene stability

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