Modifications induced by visbreaking on composition and structure of atmospheric residues

Journal Article · Mon Jan 01 00:00:00 EST 1990 · Fuel Science and Technology International; (USA)

DOI:https://doi.org/10.1080/08843759008915933· OSTI ID:7229840

Casalini, A; Mascherpa, A; Vecchi, C ^[1]

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1. Stazione sperimentale per i Combustibili, Viaale A. De Gasperi 3, San Donato Milanese (Italy)

This paper reports the atmospheric residues, the corresponding visbroken residues and the related asphaltenes characterized by elemental analysis, liquid and gel permeation chromatography (LC, GPC), nuclear magnetic resonance (NMR) and pyrolysis/gas chromatography/mass spectrometry (Py/GC/MS) before and after the thermal process. The results show that visbreaking (VB) increases the aromaticity (C{sub ar}) of the residues and decreases their resins/asphaltenes ratio. A relationship between ({delta} C{sub ar}) and resins/asphaltenes ratio has been found. The cracking of aliphatic chains which takes place during the thermal process produces asphalthenes with lower molecular weight and more condenses aromatic structures. The rise up to 60% of the ratio of aromatic to paraffinic carbon (C{sub ar}/C{sub p}) greatly affects the solubility of VB asphaltenes in a oily medium.

• OSTI ID: 7229840
• Journal Information: Fuel Science and Technology International; (USA), Vol. 8:4; ISSN 0884-3759
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
04 OIL SHALES AND TAR SANDS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ASPHALTENES
CHEMICAL COMPOSITION
PETROLEUM RESIDUES
GEL PERMEATION CHROMATOGRAPHY
LIQUID COLUMN CHROMATOGRAPHY
NMR SPECTRA
PYROLYSIS
RESINS
SOLUBILITY
THERMAL RECOVERY
ASPHALTS
BITUMENS
CHEMICAL REACTIONS
CHROMATOGRAPHY
DECOMPOSITION
ENERGY SOURCES
ENHANCED RECOVERY
FOSSIL FUELS
FUELS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OTHER ORGANIC COMPOUNDS
PETROCHEMICALS
PETROLEUM
PETROLEUM FRACTIONS
PETROLEUM PRODUCTS
POLYMERS
RECOVERY
SEPARATION PROCESSES
SPECTRA
TAR
THERMOCHEMICAL PROCESSES
023000* - Petroleum- Properties & Composition
040500 - Oil Shales & Tar Sands- Properties & Composition
040401 - Oil Shales & Tar Sands- In Situ Methods
True & Modified
400800 - Combustion
Pyrolysis
& High-Temperature Chemistry