3. These methods have been used in establishing the group composition of the sulfur compounds present in distillate fuels. It has been shown that with increasing molecular weight (boiling point) of the sulfur compounds, the relative amounts of thiophenes and oxygen-containing products increase, ...
Which is more important in determining a compounds melting point, its polarity or its formula weight? Does the bonding character (and hence the chemical properties) of a compound have much to do with the structure of the nucleus (i.e., how m...
7. The method of claim 6 wherein said first fraction consists of hydrocarbons, said second fraction consists of weakly acidic compounds, said third fraction consists of carboxylic acids, and said fourth fraction consists of polyacids. 8. The method of claim 7, wherein boiling point distribution...
The term "petroleum" as used herein includes crude oils, residual oils, hydrocarbons, heteroatom compounds normally found as constituents in crude oils and the fractions derived from any of the above. Thus, there is provided a method for determining the tendency of oil containing asphaltenes to ...
Some were at or close to equilibrium with the first time point. Black lines of best fit are robust regressions of Michaelis–Menton first-order curves. Full size image Several other compounds were seen to reach the curvilinear phase (Supplementary Information Fig.2), including both exposure concen...
Surface Active Agents as Antiadhesive Additive in Rubber Compounds for Tire Applications In the reported experiments, studies have been carried out on the effect of surface active agents (SAA) on adhesivity of rubber mixtures. It has been estab... J Broniarz,J Danielczyk,T Korobacz,... ...
METHOD FOR DETERMINING POLYCYCLIC AROMAIC COMPOUND IN PITCHPURPOSE: To provide a method for determining a small amount of polycyclic aromaic compounds in a pitch accurately and easily. ;CONSTITUTION: Pitch is added to toluene whose weight is at least twenty times higher, reflux extraction is ...
for Testing and Materials (1996)), 0.01 kPa at 293 K (according to the European Union (1999)), or 10 Pa at 298 K (according to the U.S. Environmental Protection Agency (1999)), with a lower boiling point limit of 50–100°C and an upper boiling point limit of 240–260°C....
solutions/ enthalpy of associationassociated solutionsentropy of associationequilibrium constantThis article presents a new method for determining the enthalpy and entropy of association of pure compounds. The only data needed are the temperature and the enthalpy of vaporisation at the normal boiling point...
for the test and reference substances, led, as expected, to a poor correlation ( r 2 = 89.1% only), with significantly deviating polar compounds and (ii) the model showed significant improvement after incorporating a new empirical term related to vaporization entropy and boiling point. The...