| 摘要 |
A process for preparing chlorine by gas-phase oxidation of hydrogen chloride over a heterogeneous, particulate catalyst in a fluidized-bed reactor to give a product gas mixture which is freed of entrained catalyst particles in cyclones (1) which are arranged in the upper region of the fluidized-bed reactor, which comprises a cylindrical upper part (2) which has a tangential or spiral-shaped inlet (3) for the product gas mixture and tapers at its lower end via a conical section (4) into a cyclone downcomer tube (5) and also a central downward-extending tube (6) in the upper region of the cyclone (1) for discharging the product gas mixture which has been freed of entrained catalyst particles, wherein from one to seven cascades of in each case from two to five cyclones (1) connected in series are used, with the cyclones (1) of each cascade, with the exception of the first cyclone (1) through which flow occurs in each case, which is designed so that about 90 to 99% by weight of the entrained catalyst particles are precipitated, each having a trickle valve (7) comprising an angled tube end piece (8) and also a loose flap (9) suspended at an angle α to the vertical at the lower end of the cyclone downcomer tube (5), where the angle α and the weight of the flap (9) are designed so that the torque of the flap (9) divided by the diameter of the outlet opening from the angled tube end piece (8) is in the range from 2 to 300 N/m2, is proposed. |
