Emulsion of waxy crude oil is one of the common states in the subsea pipeline. At low temperatures in offshore environment, waxy crude oils with water could form the crude oil emulsion gel of oil-in-water emulsion. Thus, the waxy crude oil emulsion viscoelastic behavior for deep sea transportation and restarting pipeline safety is particularly important. By means of MASIII HAAKE rheometer which...

The utilization of two crude oil samples of different quality at 4 and 30 C has been studied by using pure and mixed bacterial cultures obtained by enrichment procedures. Growth, emulsification, and utilization occurred readily at both temperatures. The crude oil residue is increased in specific gravity and readily sediments out of solution. A comparison of the chemical analysis of the oils by ...

Asphaltenes are regarded as troublesome components of crude oils their precipitation and deposition inside production wells downstream infrastructure often result in a reduction productio...

Hexane and methanolic oil extracts from five varieties of Artocarpus seeds were studied to explore its suitability for ethno medical uses. Crude hexane and methanolic oils were found to shown good to moderate activity against bacteria, in particular Gram +ve (Bacillus cereus, Bacillus subtilis and Staphylococcus aureus) and Gram-ve (Eschirichia coli and Pseudomonas aeruginosa) and fungal stains...

The effects of air-drying and freeze-drying on the extraction yields and quality of oils from Quebec sea buckthorn (cv. Indian-summer) seeds and pulp were studied. Oil extractions were carried out using hexane. Air-dried (ADS) and freeze-dried (FDS) seeds, gave a similar extraction yields ( 12% w/w), whereas those of air-dried (ADP) and freeze-dried (FDP) pulps were significantly different (35....

In this work, the rheological behavior of a group of model crude oils is experimentally studied at temperatures below their wax appearance temperature (WAT). We consider both a two-component wax-oil system and a three-component oil-water emulsion that is partially stabilized by precipitated wax. We characterize the shear-localization and yielding using a combined approach of bulk rheometry and ...

Microorganisms possess enormous highly specific metabolic activities, which enable them to utilize and transform nearly every known chemical class present in crude oil. In this context, one of the most studied biocatalytic processes is the biodesulfurization (BDS) of thiophenic sulfur-containing compounds such as benzothiophene (BT) and dibenzothiophene (DBT) in crude oils and refinery streams....

We report on the use of (kraft and soda) lignins as polymeric amphiphiles for the stabilization of emulsions. Lignins’ phase behavior in oil/water systems is presented and explained in terms of their molecular affinities. Emulsions with various oils (including crude oils) were formulated and their properties were rationalized in terms of lignin surface activity as a function of pH and salinity....

The microbial degradation of two Venezuelan crude oils enriched in 25-norhopanes was examined after a 5-week aerobic incubation using a microbial enrichment culture. Analysis of the oils using gas chromatography±mass spectrometry revealed degradation of the C28 tricyclic terpane, the C29±C34 17a(H),21b(H)-hopanes, and the C29 17a(H),21b(H)-25-norhopane. The C35 17a(H),21b(H)-hopane and 18a(H)-o...

DOI: 10.1002/sscp.202200040 The cover picture shows isolation of natural products from plants, bacteria, fungi and marine organisms by Preparative High Performance Liquid Chromatography (HPLC). This technique often allows simple complex compounds using little sample preparation or crude extracts. Among these, several bioactive organic can be obtained with high purity, yield productivity. great ...