Abstract: A 20 t/a scale pilot experimental device for continuous gas-phase catalytic dehydrogenation of industrial dipentene was designed and tested. The catalytic dehydrogenation could be continuously carried out under the conditions of temperature 280-300 ℃, nitrogen flow rate 2.0 L/min, industrial dipentene flow rate 4.0 L/h. The average mass ratio of industrial dipentene to crude product (kg/kg) was 1.11. The crude product of dehydrogenation was easily purified by the vacuum rectification apparatus. Mass ratio of industrial dipentene to p-cymene product (kg/kg) was 1.81 (purity over 99.0%), 1.69 (purity over 98.0%), 1.54 (purity over 96.0%) and 1.45 (purity over 90.0%), respectively. The boiling point, relative density and refractive index of p-cymene product with 99.5% purity were 177.1 ℃, 0.857 g/mL and 1.490, respectively. The pilot experimental statistics could provide services for engineering or industrialization development of p-cymene manufacture from industrial dipentene.

Key words: industrial dipentene, catalytic dehydrogenation, p-cymene, pilot experimental statistics