Liquid Density of Reformed Naphtha up to 200°C

Gen Ichi Kaminishi, Chiaki Yokoyama, Shinji Takahashi

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1 Citation (Scopus)


Measurements were made for the liquid densities of two reformed naphthas, samples 1 and 2, in the temperature range from 15 to 200°C, using a Pyrex glass pycnometer. Details of the pycnometer are shown in Fig. 1. The volume of the pycnometer was calibrated with mercury. Its volume up to the marked line is 21.999±0.004ml and that of its capillary section is 0.153ml at 20°C. The principle of measurements is the same as that described in our previous report1). In the present work, the density of the reformed naphtha was determined by measuring the temperature at which the liquid volume has increased by thermal expansion of the sample to the marked line. The properties of the two reformed naphtha are shown in Tables 1 and 2. The experimental results are listed in Table 3 and plotted as a function of temperature in Fig. 2. The reformed naphtha density decreased with increasing temperature and that of sample 1, which had a higher dry point than that of sample 2, was larger than that of sample 2. The experimental results could be represented by eq. (1) with a maximum deviation of 0.13% and an absolute average deviation of 0.02%. The coefficients of eq. (1) are listed in Table 4. The densities of samples 1 and 2 were calculated with the modified Rackett equation [MR eq. (eq.(2))] and with Hankinson and Thomson equation [HT eq. (eq. (3))], where ZRA of MR eq. and V* of HT eq. were determined from the distillation test (JIS K 2254) and liquid density data at 15°C (JIS K 2249). The critical temperature, Tc, and the critical pressure, Pc, were calculated with the equations of Kesler and Lee [eqs. (8) and (11)], Riazi and Daubert [eqs. (9) and (12)], and Brule et al. [eq. (10)]. The acentric factor, ω, was calculated with the equation of Kesler and Lee [eq. (13)]. The calculated and experimental liquid densities are compared in Table 5. It was found that the density of the reformed naphtha could be calculated with a maximum deviation of 0.17% with the HT eq. (eq.(3)) employing eqs. (8) and (13) (Method I).

Original languageEnglish
Pages (from-to)294-298
Number of pages5
JournalJournal of The Japan Petroleum Institute
Issue number6
Publication statusPublished - 1989 Jan 1


  • Hankinson-Thomson equation
  • Liquid density
  • Pycnometer. Distillation
  • Reformed naphtha

ASJC Scopus subject areas

  • Fuel Technology
  • Energy Engineering and Power Technology


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