Influences of the Molecular Weight and Its Distribution of Poly(styrene-alt-octadecyl maleimide) as a Flow Improver for Crude Oils

2016 ◽  
Vol 30 (4) ◽  
pp. 2721-2728 ◽  
Author(s):  
Kun Cao ◽  
Qing-jun Zhu ◽  
Xiang-xia Wei ◽  
Yun-fei Yu ◽  
Zhen Yao
Keyword(s):  
Molecular Weight ◽  
Crude Oils ◽  
Flow Improver

scholarly journals Study of linseed oil, its biodiesel and xylene as flow improver for Nigerian waxy crude oils

2021 ◽  
Author(s):  
Ogunkunle Temitope Fred ◽  
Abraham Victoria Damilola ◽  
Adebisi Abimbola Ashonibare ◽  
Rukayat Adenike ◽  
Tega-oboh Elohor Sylvia
Keyword(s):  
Linseed Oil ◽  
Crude Oils ◽  
Waxy Crude ◽  
Waxy Crude Oils ◽  
Flow Improver

Experimental Investigation of Rheological Behaviors and Flow Improving by Chemical for Waxy Crude Oils

2006 ◽  
Author(s):  
Jiaqiang Jing ◽  
Zhongyuan Guan ◽  
Xiaoqin Xiong ◽  
Hua Tian ◽  
Liwen Tan
Keyword(s):  
Structure Formation ◽  
Pour Point ◽  
Viscosity Reduction ◽  
Crude Oils ◽  
Polarization Microscopy ◽  
Rheological Behaviors ◽  
Waxy Crude ◽  
Waxy Crude Oils ◽  
Flow Improver ◽  
Wax Crystals

It has been proved that the flow improver makes the transportation of waxy crude oils in pipeline much more economic and safe, but so far an universal flow improver for various waxy crude oils has not been found because of inadequately understanding the action mechanism of the flow improvers. Therefore it is necessary for the mechanism to be studied further. A series of synthetic waxy oils (SWOs) with or without flow improver GY1, a long chain alkyl acrylate polymer based chemical, are prepared from 25# transformer oil, 50#, 60# (macrocrystalline) and 80# (microcrystalline) wax, single or mixed, and in some cases 60# road asphalt by mixing the ingredients at 100°C for 1 hour. Characteristic temperatures, viscosity-temperature properties and rheological behaviors are studied by using rheological techniques, and microstructures of wax crystals grown from SWOs at 20 °C are analyzed by using a polarization microscopy. Some abnormal viscosity-temperature properties of SWOs are found, which mainly results from wax crystallization and network structure formed by wax crystals. The mechanisms involved in the structure formation and fluidity improved by chemical for SWOs are discussed here. Studies show that the structure formation is followed by the formation of crystal nuclei, growth and interconnection or bridging of the wax crystal particles, which is closely relevant to wax molecular dimension and content, crystalline particle size, shape, concentration and surface characteristics. GY1 added into the SWOs lowers their cloud points by 0–2.0 °C and enhances the amounts of wax precipitated at 30 °C by 10–35wt%, which might not be involved in the mechanisms of the fluidity improving under this study. The extent of pour point depression by GY1 increases with increasing the wax molecular size and decreasing the wax content in the SWOs. As long as the SWO treated by GY1 has a greater yield stress reduction at the temperature closed to its pour point, its viscosity and pour point reduction will be more obvious. The common shortcut of pour point depression and viscosity reduction is to inhibit or desintegrate the formation of paraffin crystal network. The mechanisms involved in fluidity improvement of waxy crude oils by chemicals include modifying surface properties of waxy crystals and promoting crystal particle growth with higher symmetry.

Distribution of high-molecular-weight n-alkanes in paraffinic crude oils and asphaltene-resin-paraffin deposits

2010 ◽  
Vol 50 (1) ◽  
pp. 17-22 ◽  
Author(s):  
Yu. M. Ganeeva ◽  
T. R. Foss ◽  
T. N. Yusupova ◽  
A. G. Romanov
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Crude Oils ◽  
Paraffinic Crude

High molecular weight aromatic nitrogen and other novel hopanoid-related compounds in crude oils

2004 ◽  
Vol 35 (6) ◽  
pp. 665-678 ◽  
Author(s):  
T.B.P Oldenburg ◽  
H Huang ◽  
P Donohoe ◽  
H Willsch ◽  
S.R Larter
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Crude Oils ◽  
Related Compounds

Low molecular weight gels: potential in remediation of crude oil spillage and recovery

RSC Advances ◽  
2016 ◽  
Vol 6 (58) ◽  
pp. 53415-53420 ◽  
Author(s):  
Ch. Siva Kesava Raju ◽  
Bhaskar Pramanik ◽  
Tanmoy Kar ◽  
Peddy V. C. Rao ◽  
Nettem V. Choudary ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Crude Oil ◽  
Potential Application ◽  
Crude Oils ◽  
Low Molecular Weight ◽  
Oil Spillage ◽  
Wide Range ◽  
First Time

A molecular gelator which has strong gelation ability for different crude oils (light to heavy crudes), and a wide range of refinery products is reported for the first time for its potential application in oil spillage/recovery.

Alkyl Fumarate−Vinyl Acetate Copolymer as Flow Improver for High Waxy Indian Crude Oils

1996 ◽  
Vol 10 (3) ◽  
pp. 844-848 ◽  
Author(s):  
A. Borthakur ◽  
D. Chanda ◽  
S. R. Dutta Choudhury ◽  
K. V. Rao ◽  
B. Subrahmanyam
Keyword(s):  
Vinyl Acetate ◽  
Crude Oils ◽  
Flow Improver ◽  
Acetate Copolymer

scholarly journals Production and characterisation of a marine Halomonas surface-active exopolymer

2019 ◽  
Vol 104 (3) ◽  
pp. 1063-1076
Author(s):  
Tony Gutierrez ◽  
Gordon Morris ◽  
Dave Ellis ◽  
Barbara Mulloy ◽  
Michael D. Aitken
Keyword(s):  
Molecular Weight ◽  
Ionic Strength ◽  
High Molecular Weight ◽  
Positive Influence ◽  
Contaminated Sites ◽  
Crude Oils ◽  
Magnetic Resonance Spectroscopic Analysis ◽  
Surface Active ◽  
Low Ionic Strength ◽  
Pure Hydrocarbon

AbstractDuring screening for novel emulsifiers and surfactants, a marine gammaproteobacterium, Halomonas sp. MCTG39a, was isolated and selected for its production of an extracellular emulsifying agent, P39a. This polymer was produced by the new isolate during growth in a modified Zobell’s 2216 medium amended with 1% glucose, and was extractable by cold ethanol precipitation. Chemical, chromatographic and nuclear magnetic resonance spectroscopic analysis confirmed P39a to be a high-molecular-weight (~ 261,000 g/mol) glycoprotein composed of carbohydrate (17.2%) and protein (36.4%). The polymer exhibited high emulsifying activities against a range of oil substrates that included straight-chain aliphatics, mono- and alkyl- aromatics and cycloparaffins. In general, higher emulsification values were measured under low (0.1 M PBS) compared to high (synthetic seawater) ionic strength conditions, indicating that low ionic strength is more favourable for emulsification by the P39a polymer. However, as observed with other bacterial emulsifying agents, the polymer emulsified some aromatic hydrocarbon species, as well as refined and crude oils, more effectively under high ionic strength conditions, which we posit could be due to steric adsorption to these substrates as may be conferred by the protein fraction of the polymer. Furthermore, the polymer effected a positive influence on the degradation of phenanthrene by other marine bacteria, such as the specialist PAH-degrader Polycyclovorans algicola. Collectively, based on the ability of this Halomonas high-molecular-weight glycoprotein to emulsify a range of pure hydrocarbon species, as well as refined and crude oils, it shows promise for the bioremediation of contaminated sites.

Sign in / Sign up

Export Citation Format

Share Document