PMID- 16599542
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20070724
LR  - 20060407
IS  - 1520-6106 (Print)
IS  - 1520-5207 (Linking)
VI  - 110
IP  - 14
DP  - 2006 Apr 13
TI  - Selective inhibition of paraffin deposition under high flow rate as a function of 
      the crude oil paraffin type and content by fluorescence depolarization: 
      polypropylene and high-density polyethylene.
PG  - 7587-91
AB  - High-density polyethylene (HDPE) and polypropylene (PP) were studied to identify 
      tailor-made materials for walls of pipelines and ducts for crude paraffinic oil 
      that inhibit paraffin depositions. The interfacial interaction was investigated 
      from 50 to 70 degrees C and as a function of the n-C(36)H(74) paraffin 
      concentration added to the paraffinic crude oil. The static and the dynamic 
      interfacial tensions were observed, respectively, by traditional contact angle 
      measurements and by fluorescence depolarization of the natural fluorescent probes 
      of the crude oil, flowing at a high rate. The static interaction showed a low 
      dependence on the n-paraffin content for both surfaces. For PP, it decreased 
      slightly as the n-paraffin concentration increased, evidencing an increase in the 
      liquid-liquid interaction. The dynamic interfacial tension with PP clearly 
      decreased as temperature and n-paraffin concentration increased, the latter 
      effect being attributed to the PP methyl groups hindering the interaction between 
      the n-paraffin and the PP main chain. For the flow on HDPE, the interaction 
      proved to be highly dependent on the n-paraffin concentration and temperature. It 
      increased as n-paraffin was added and temperature decreased. The former effect is 
      attributed to the alignment of the n-paraffin chains within the high rate flowing 
      liquid and the similar molecular geometry of the n-paraffin and the linear 
      polymer surface (almost without branches), which increases the number of sites 
      available for interaction. PP proved to be more suitable for transportation of 
      crude oil rich in paraffins with more than 36 carbon atoms, while HDPE was more 
      suitable for those with smaller paraffinic chains.
FAU - Quintella, Cristina M
AU  - Quintella CM
AD  - Instituto de Quimica, Universidade Federal da Bahia, Campus de Ondina, Salvador, 
      BA, Brazil. cristina@ufba.br
FAU - Lima, Angelo M V
AU  - Lima AM
FAU - Silva, Eduardo B
AU  - Silva EB
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Phys Chem B
JT  - The journal of physical chemistry. B
JID - 101157530
EDAT- 2006/04/08 09:00
MHDA- 2006/04/08 09:01
CRDT- 2006/04/08 09:00
PHST- 2006/04/08 09:00 [pubmed]
PHST- 2006/04/08 09:01 [medline]
PHST- 2006/04/08 09:00 [entrez]
AID - 10.1021/jp055934u [doi]
PST - ppublish
SO  - J Phys Chem B. 2006 Apr 13;110(14):7587-91. doi: 10.1021/jp055934u.