Components and flow rate of the material at the outlet of the vacuum pump for the vacuum distillation of naphtha
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The figure below shows a reflux drum for naphtha vacuum distillation. The material flow rate is 6000 kg/h, the pressure is -55 kPa, and the inlet temperature of the vacuum pump ranges from 5 to 25 degrees Celsius (winter to summer). It is required to determine the material flow rate and composition at the outlet of the vacuum pump. Appendix: Results of material composition analysis: Pumice naphtha – Initial boiling point, °C: 33.4; 5%, °C: 54.8; 10%, °C: 62.4; 50%, °C: 116.1; 90%, °C: 150.7; 95%, °C: 173.3. Final boiling point, °C: 189.2. Density, kg/m3: 753.3. ω (non-aromatics), %: 65.51. ω (benzene), %: 2.18. ω (toluene), %: 7.93. ω (ethylbenzene), %: 2.27. ω (p-xylene), %: 2.52. ω (m-xylene), %: 5.69. ω (o-xylene), %: 2.2. ω (C9 and above), %: 11.7
What comes out of the vacuum pump is non-condensable gas! We have not carried out any tests on this type of non-condensable gas in our equipment; it always goes straight into the catalytic or coking processes!
Estimation: mainly air + water vapor, with media below ~50% C4 added to the gas.