| 摘要 |
In vertical vapour phase polymerisation appts. for homo- or co-polymerisation of vinyl chloride comprising spray nozzles for vinyl chloride monomer (VCM), spray nozzles for seed polymer slurry, a recovery line for VCM gas, an agitator, a prod. discharge pipe, and a jacket, an agitator (5) having anchor-shaped blades of a length 1/4-1/2 of the length of reacting tank (1) is rotated from the bottom at 100 rpm or less, and, where necessary, an auxiliary agitator (8) is provided from above. A jacket which is split into 2 or more sections (2), (3), (4) in the vertical direction cover the whole of the reacting tank (1), a prod. discharge pipe (14) of dia. 25 Angstroms or lager is lowered from above for use in normal operation, and a prod. discharge pipe (15) at the bottom used in emergency are provided. VCM and slurry nozzles are provided to meet the supply rates of VCM and seed polymer slurry, the nozzles (9) having an inlet I.D. of 1.0 mm or more and an outlet I.D. of 2.0 mm or more. The nozzles (10) for the seed polymer slurry have an inlet I.D. of 1.5 mm and an outlet I.D. of 2.0 mm to prevent occurrence of plugging. |
