AN EXAMINATION OF METHODS FOR CALCULATING VAPOR PRESSURE OF PETROLEUM HYDROCARBON
Abstract
At high temperatures, the vapor pressure of kerosene-type hydrocarbons is difficult to measure accurately with laboratory apparatus. Be cause of difficulties in direct measurement of vapor pressure-temperature relationships at high temperatures, the vapor pressure is determined through calculation techniques. This report compares the difficulty and accuracy of five techniques, of which three were basic calculation techniques and two were experimental techniques. To compare the techniques and determine the precision of a calculation technique, four independent workers calculated the vapor pressure-temperature relationship for one high-quality jet fuel and one synthetic blend of seven pure hydrocarbons. Results demonstrate that the method of assuming segments of the true boiling point curve to be pure compounds and finding the total vapor pressure as the sum of the component partial pressures is precise to =5%. The empirical technique developed by Edmister is less accurate and less precise than the more laborious true boiling point curve technique. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1964
- Accession Number
- AD0437285
Entities
People
- Alan E. Zengel
- Herbert R. Lander
Organizations
- Air Force Research Laboratory