saidi_farzad

Hi, I have a mixture of hydrocarbons with a wide range of boiling points (200-620 centigrade). I want to distill this mixture in vacuum. I have no problem for distillation of light fractions with boiling points less than 450oC. But for the fraction with boiling point in the range of 450-620 centigrade, I need to do the distillation in high vacuum (0.01-0.001 mbar)! How cant I get this amount of vacuum by combination of different vacuum pumps (Roots Vacuum Pump; SIDE CHANNEL Vacuum Pumps; Liquid Ring Vacuum Pumps and Rotary vane Vacuum pump!)? The size of the distillation chamber (Made of black iron sheets) which we use is about 50000 lit, so the speed of vacuum should be more than 1500 m3/h. Is there any suggestion for me? Which vacuum pumps should I use? How should I connect them together (parallel or serial?)?