There is no liquid waste discharged from this process, and there are few hydrocarbons discharged to the atmosphere, so the impact on the environment is very small. Compared with other processes, this process is easier to achieve strict environmental, health and safety standards. Another remarkable feature of this process is that it can be operated in a super condensed state, that is, the so-called super condensed gas phase fluidized bed process (SCM). By increasing the proportion of liquid phase in the reactor to 45%, the current production capacity can be increased by 200%. Because the liquid content is not the basic factor for the instability of the fluidized bed and the formation of polymer agglomerates, the key operating variables of the technology are the density of the expansion bed and the ratio of the expansion density to the settlement density. Because the operation of supercondensation can remove the reaction heat most effectively, it can increase the production capacity of the reactor by more than 2 times without increasing the volume, which is very significant for investment savings. The ethylene content of impact copolymers can be as high as 17% (rubber content is more than 30%).
The core equipment of the process is gas-phase fluidized bed reactor, circulating gas compressor, circulating gas cooler and extrusion granulation unit. The fluid bed reactor is a hollow vessel with an expansion section at the top and a distributor at the bottom. The first reactor has an operating pressure of 3.5mpag, a temperature of 67 ℃, the second reactor has an operating pressure of 2.1mpag, and a temperature of 70 ℃; the circulating gas compressor is a single-stage, constant speed, centrifugal compressor.
