Extractive treatment of paraffin waxes with dimethylformamide

1979 ◽  
Vol 15 (8) ◽  
pp. 559-561
Author(s):  
D. K. Tarasov ◽  
A. N. Pereverzev ◽  
V. S. Fadeev
Keyword(s):  
Paraffin Waxes ◽  
Extractive Treatment

scholarly journals An Empirical Correlation for the Solubility of Paraffin Waxes in Base Oils

1995 ◽  
Vol 7 (1) ◽  
pp. 81-92 ◽  
Author(s):  
MALIK ALAHMAD ◽  
TARIQ AL-FARISS ◽  
MOHAMAD ABASHAR ◽  
HISHAM ETTOUNEY
Keyword(s):  
Empirical Correlation ◽  
Base Oils ◽  
Paraffin Waxes

X-Ray Diffraction Study of Fractionated Paraffin Waxes

1931 ◽  
Vol 23 (6) ◽  
pp. 697-701 ◽  
Author(s):  
George L. Clark ◽  
Howard A. Smit
Keyword(s):  
Diffraction Study ◽  
X Ray Diffraction ◽  
X Ray ◽  
Paraffin Waxes

LAND-PLANT SOURCE ROCKS FOR OIL AND THEIR SIGNIFICANCE IN AUSTRALIAN BASINS

1982 ◽  
Vol 22 (1) ◽  
pp. 164 ◽  
Author(s):  
B. M. Thomas
Keyword(s):  
Depositional Environment ◽  
Land Plant ◽  
Source Rocks ◽  
Coal Measure ◽  
Terrestrial Plants ◽  
Geological Time ◽  
Close Relationship ◽  
Jurassic Coal ◽  
Paraffin Waxes ◽  
Gippsland Basin

Many Australian oils are rich in paraffin waxes which are derived from the remains of terrestrial plants. Although the land-plant contribution to oils, particularly those found in a paralic or deltaic environment, is well established, opinion is divided on the ability of non-marine coaly sediments to generate and expel commercial quantities of oil. It appears that some coal measure sequences have generated mainly gas whilst others are the source of large oil accumulations. The composition of coals deposited in Australia has varied through geological time as a result of differences in climate, geological setting, depositional environment and stage of floral evolution. Consequently, most Australian pre-Jurassic coal measure sequences are deficient in exinite macerals and are therefore mainly gas-prone. In contrast, Jurassic to Tertiary coal-rich sequences often contain abundant exinite and may have substantial potential to generate oil in commercial quantities, as demonstrated by the well-known Gippsland Basin (Bass Strait) oilfields.A similar trend is observed worldwide, where, despite the extraordinary global abundance of Late Palaeozoic coals, only minor amounts of crude oil of land-plant origin are known to be associated with them. However, there appears to be a close relationship between the occurrence of waxy, land-plant-derived crudes and coaly sediments of Cretaceous and Tertiary age. This is thought to be a result of the dominance of conifers in swamp floras of these periods, together with the evolution of the angiosperms (flowering plants) in the Late Cretaceous.

Determination of Benzene in Polypropylene Food-Packaging Materials and Food-Contact Paraffin Waxes

1991 ◽  
Vol 74 (2) ◽  
pp. 367-374
Author(s):  
Sandra L Varner ◽  
Henry C Hollifield ◽  
Denis Andrzejewski
Keyword(s):  
Gas Chromatography ◽  
Food Packaging ◽  
Fused Silica ◽  
Paraffin Wax ◽  
Gas Chromatography Mass Spectrometry ◽  
Food Contact ◽  
Limit Of Quantitation ◽  
Headspace Gas ◽  
Paraffin Waxes

Abstract An analytical procedure was developed for determination of benzene in polypropylene food packaging and was adapted for determination of benzene in commercial paraffin waxes Intended for food-contact use. The polymer was dissolved in hexadecane at 150°C. The wax was melted in an 80°C oven. A simple helium-sparging apparatus was used to remove the volatile chemical from the polymer or wax. The contaminant was collected In methanol, distilled water was added, and the resulting solution was analyzed by headspace gas chromatography. The Instrument was equipped with a 30 m fused silica open tubular capillary column and a photoionization detector. Average recoveries of benzene from polymer and paraffin wax at low parts-per-billion concentrations were 63 and 70%, respectively. Limits of detection and quantitation for analysis of polypropylene were 8 and 17 ppb, respectively; the limit of quantitation for analysis of paraffin wax was 2 ppb. in several commercial polypropylene products examined, benzene levels ranged from none detected to 426 ppb. In 3 commercial waxes examined, concentrations of 16-73 ppb benzene were determined. The presence of benzene was confirmed by gas chromatography/mass spectrometry

The Extraction and Determination of Polynuclear Hydrocarbons in Paraffin Waxes

1963 ◽  
Vol 46 (6) ◽  
pp. 933-941
Author(s):  
John W Howard ◽  
Edward O Haenni
Keyword(s):  
Dimethyl Sulfoxide ◽  
Absorption Spectra ◽  
Partition Coefficients ◽  
Paraffin Wax ◽  
Chromatographic Techniques ◽  
Polynuclear Compounds ◽  
Pure Compounds ◽  
Background Material ◽  
Paraffin Waxes

Abstract A method for the isolation and determination of polynuclear hydrocarbons in paraffin wax has been developed in which polynuclear compounds are extracted from the wax by diluting a melted wax solution with an aliphatic solvent and extracting the resulting solution with dimethyl sulfoxide. Paper chromatographic techniques are used to separate the compounds from the background material extracted from the wax. The hydrocarbons are rechromatographed until their ultraviolet absorption spectra are comparable to those obtained for pure compounds. Recoveries of 19 polynuclear hydrocarbons added to 100 g samples of paraffin wax at levels of 0.1 ppm or less ranged from 62 to 96%. Recoveries of benzo(a)pyrene and dibenz(a, h) anthracene added to 100 g or 500 g of wax at levels as low as 0.02 ppm or 0.005 ppm, respectively, were in the range 90—100%. The variations in the recoveries are apparently caused by differences in the partition coefficients of the hydrocarbons between the aliphatic solvent and dimethyl sulfoxide and at lower levels by the tendency of some of the compounds to be oxidized. The method has been utilized for the determination of polynuclear hydrocarbons in commercial waxes.

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