Sludge formation in heavy oils

✍ Scribed by D.J. Ruzicka; S. Nordenson

• Book ID: 103093169
• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 663 KB
• Volume: 69
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(90)90034-n

✦ Synopsis

Accelerated sludge formation was carried out under laboratory conditions in 20 residual oils. The methods of acceleration were heating and storage in oxygen or addition of cetane. Addition of cetane was found to be the most efficient method. The amount of sludge was mainly determined by centrifugation at 120°C. Pairwise correlations between variables were calculated by the Kendall method. Partial least squares regressions were used to make predictive models for sludge formation. Storage instability of oils of different refinery origins increased in the following order: straight run residue, catalytically cracked residue, visbroken residue. Storage instability correlated mainly with the asphaltene content, viscosity and the sulphur content. Some correlation with the nitrogen content was also obtained.