Isolation and Characterization of Paraffinic Components From Venezuelan Asphalts Effects of Paraffin Dopants on Rheological Properties of Some Asphalts

Carbognani, Lante; Duarte, Daniela; Rosales, J. Merced Martínez; Villalobos, Julio

doi:10.1080/10916469808949825

Cited by 19 publications

(10 citation statements)

References 14 publications

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“…Wax in bitumen is petroleum wax coming from refining of waxy paraffinic crude oils. However, different users have not yet come to any agreement concerning a most suitable definition for wax in bitumen . The two fundamental petroleum wax classes generally recognized in crude oils and distillates are paraffin waxes and microcrystalline waxes.…”

Section: Introductionmentioning

confidence: 99%

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Rheological Effects of Waxes in Bitumen

Edwards

Redelius

2003

Energy Fuels

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Rheological effects of adding two bitumen waxes (isolated from SEC-II fraction) to three bitumens were studied using dynamic mechanical analysis (DMA). Also, a commercially available slack wax was used in the study. The results show that the magnitude and type of effect on bitumen rheology depend on the bitumen and type of crystallizing fraction in the bitumen. Effects due to wax content shown in DMA temperature sweeps are well related to the corresponding effects shown in DSC thermograms. The slope of the logarithm of the complex modulus between 25 °C and 60 °C is introduced as a possible proper factor for predicting rutting sensitivity due to wax content.

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Section: Introductionmentioning

confidence: 99%

“…Bitumen wax was isolated by Carbognani et al, using clay absorption of the polar compounds followed by Soxhlet extraction of neutral oils and wax precipitation in MEK at −10 °C. Frequency sweeps were performed at temperatures from 10 to 70 °C.…”

Section: Introductionmentioning

confidence: 99%

Rheological Effects of Waxes in Bitumen

Edwards

Redelius

2003

Energy Fuels

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“…The method involves removal of polar materials, followed by precipitation and cold tiltration employing methylethyl ketone (MEK) as solvent and a temperature of -30 'C [14]. These drastic conditions allowed an exhaustive wax separation due to the short chain of the solvent and the very low temperature used [15].…”

Section: Methodsmentioning

confidence: 99%

Correlation Between Oil Composition and Paraffin Inhibitors Activity

Garcia¹,

Carbognani²,

Urbina³

et al. 1998

Proceedings of SPE Annual Technical Conference and Exhibition

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A. Urbina, M. Orea, PDVSA-lntevep Wght 1W8, Wety of Petroleum Engineers, Inc. is~F wss prepsrsd for pressntstien at the 1s98 SPE Annual Techniml @ferenrn end Hbition hsfd in New Orleans, Leuislana, 274 September 199S. This paper was selseted for presentstiw by an SPE Program Committee folloting retiew of Infmtlm wteined In m abstract submittal by the atihor(s).~tents ef the @per, as presented, have nM been retie~by the Seciety of Petroleum Engineers and sre sub@ tO cofrectim by the author(s). The materlst, as pmeentad, dcas not mssartiy reflect sny poaitlw of W Secisty of Petroleum~ginsers, Hs officers, or memkm. Papers presented at SPE meetings are subjeof to~btiutlcm review by Editorial~mittees of the society of Petroleum Engineers. Electronic rspreductiw, distribution, or stwage of sny psi! d this Wr fer wmmercial wrpoees without the written mnssnt of th %ify of Petroleum Engineers is pmhiblted, PemiSiM to rsproduca in print is res~ctsd to sn sbstract of not more thanw erds; ilfustraticms msy n~h mpied. The sbstraot musf retain WSPICUOUS admowledgment of whera and by Mom the paper was presented. Write Libfarien, SPE, P.O. 60X S3SSSS, Ri*srdm, TX 75-SSS0, U.S.A. fax 01-S72-952-S4S5. AbstractHighly par~lnic crudes were characterized by means of physico-chemical analysis (pour point, cloud point and API gravity) and hydrocarbon analysis (wax content, paraffin class-type separation, gel permeation chromatography and high temperature simulated distillation). Although all the studied samples were typical light crudes (32 -43 'API), their high paraffin content was responsible for solidification even above room temperature (33 -48 'C). Several commercial paraffin inhibitors were evaluated with these crudes, being pour point depression the selected activity criteria. Some products evidenced good activity when added to three of the crudes under study, while others induced insignificant changes in the pour point under similar dosages. Correlations between crude oil composition and paraffin inhibitors activity were assessed. The normal / cyclo+iso-paraffins ratio of the crudes that were not affected by the paraffin inhibitors was found higher. The molecular weight dismibution (GPC) of the crudes sensitive to additives showed a bimodrd character. Additionally, the concentration of components with more than 24 carbon atoms was found lower than 39 % wt, as determined by simulated distillation. On the other hand, the crudes insensitive to the action of inhibitors displayed monomodal molecular weight distributions with larger contributions of heavy components (more than 52 % w). Doping experiments carried out with C 13-C20 and C20-C44 paraffin extracts and using polarized light microscopy for cloud point determinations, supported the previous findings and permitted to assess the inefficiency of commercial paraffin inhibitors for crudes rich in C24+ alkanes.

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“…Wax quantification was performed by a combination of two previously reported analytical methods (Carbognani et al, 1998;Garcı´a et al, 1998aGarcı´a et al, , 1998bGulf Method, 1969;Shell Method Series, 1972). The methodology used in this work involves removal of polar materials, followed by precipitation and cold filtration employing methylethyl ketone (MEK) as solvent and a temperature of À30 C. These drastic conditions allowed an exhaustive wax separation due to the short chain length of the solvent and the very low temperature.…”

Section: Crude Oil Characterizationmentioning

confidence: 99%

Effect of Crude Oil Composition and Blending on Flowing Properties

García

Urbina

2003

Petroleum Science and Technology

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The effect of crude oil n-paraffin molecular weight distribution on wax crystallization risk was studied. Sixteen highly paraffinic crude oils from Eastern Venezuela were characterized, in terms of hydrocarbon family distribution, by High Temperature Simulate Distillation (HTSD), Gel Permeation Chromatography (GPC), and wax content. n-Paraffin chain length was correlated with crude oil cloud point and pour point. It was demonstrated that high molecular weight linear paraffins are responsible for crude oil wax precipitation. A quantitative correlation between molecular weight distribution and crude oil flowing properties was also obtained. It was found that the wider the molecular weight distribution, the lower is the wax crystallization risk. Blends of different paraffinic crude oils *Correspondence: Marı´a del Carmen Garcı´a, Integrated Production Department, PDVSA-Intevep

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Isolation and Characterization of Paraffinic Components From Venezuelan Asphalts Effects of Paraffin Dopants on Rheological Properties of Some Asphalts

Cited by 19 publications

References 14 publications

Rheological Effects of Waxes in Bitumen

Rheological Effects of Waxes in Bitumen

Correlation Between Oil Composition and Paraffin Inhibitors Activity

Effect of Crude Oil Composition and Blending on Flowing Properties

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