FIELD: chemical technology. SUBSTANCE: invention relates to a method of determination of stable working range of gaseous polymerization in fluidized layer and this process is carried out by condensation variant. Method involves observation for changes in volume density reactor of fluidized material that are associated with alternations of fluidized medium composition. Increase of cooling capability of recirculating flow by change of composition without level excess when decrease of fluidized material volume density becomes irreversible. Indices of safety process carrying out at weak failure risk at high output of reactor and/or elimination of limits of device output due to reactor output are found. EFFECT: improved method of process. 8 cl, 5 dwg, 4 tbl, 3 ex
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