Raffinate Oil Research Articles

Novel tin‐coupled star‐shaped medium vinyl butadiene rubber. II. Vinyl content, molecular weight, and their effects on properties

AbstractOn the basis of our earlier work, extensive experiments were conducted to further investigate the regulating means of vinyl content, molecular weight, molecular weight distribution, and their effects on overall performance of star‐shaped medium vinyl butadiene rubber (S‐MVBR), which was prepared by “core‐first” method with novel multifunctional organolithium as initiator, tetrahydrofuran (THF) as structure regulator, and raffinate oil as solvent. The results showed that vinyl content and molecular weight for one arm were easily regulated from 30 to 55%, 6–10 ten thousand, respectively. The tensile strength and elongation at break increased with increasing vinyl content and the dynamic heating was the lowest at vinyl content of 43%. S‐MVBR had a relatively wide and symmetrical monomodal distribution, which was in favorable of good processing properties. S‐MVBR containing Sn atom, with arm number of 3.8, molecular weight for one arm of eight 10,000, vinyl content of 50%, and distribution of molecular weight of 1.54, had optimal overall properties. When compared with cis‐BR and linear MVBR, S‐MVBR had low rolling energy loss, high wet grip, good mechanical and processing properties. It was an ideal rubber for high performance tire tread. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 3924–3930, 2007

Simultaneous determination of major characteristic parameters of naphtha by capillary gas chromatography

A method for determining major characteristic parameters of naphthas by capillary gas chromatography was developed to identify the individual hydrocarbons in naphtha and determine the hydrocarbon-type PNA value, the average molecular weight, the carbon-to-hydrogen ratio, the density and boiling point range of naphtha. The method can also be used to analyze other light fractions of petroleum such as natural gas liquid and by-products from petrochemical processing such as raffinate oil. The data obtained by the method had a good agreement with those by other methods. The method was not affected by surroundings conditions when determining boiling point range of light petroleum fractions and can provide with more detailed information. The recovery percentage was 100% when the method used to measure boiling distribution of light fraction. The method was utilized to predict the pyrolytic effect of different naphthas for ethylene production. The prediction had an agreement with the results that were obtained by pyrolysis of naphthas on the Bench Scale Pyrolysis Apparatus (BSPA) made by M.W. Kellogg Company.

Determination of water at the parts per million level in buta-1,3-diene and associated solvents by gas chromatography

Water in buta-1,3-diene and associated solvents (such as raffinate oil) can be determined by gas chromatography at levels as low as 1 ppm. The method is mainly based on the excellent selectivity of the porous carbon beads TDX-02, the use of a micro-syringe for liquefied gas, and two criteria for accurate quantitative measurement.