Monomer Recovery -
Currently, most of the reactor cycle purge and vent gases from
ethylene consuming plants such as gas-phase polyethylene, EO/EG,
etc. are flared because cryogenic processes are not sufficiently
economical or flexible enough to recover contained monomers.
By cost-effectively adapting the non-cryogenic, absorption-based
technology to the reactor waste gas streams, the
hydrogenated reactor byproducts are rejected to the fuel gas
system, most all of the contained unreacted monomers are
recovered, and the environmental emissions are substantially
reduced. The patented Monomer Recovery Unit (MRU) technology
is very adaptable to cope with the wide ranging stream
compositions and rates typical of gas phase polyethylene units.
In this innovative process, the heavier components that are
present in the reactor waste gas streams are used as the preferred
absorption solvent whereby no external solvent is required.