FIELD: polymer production.
SUBSTANCE: invention relates to a gas-phase process for producing polyethylene from ethylene in fluidized-bed reactor, which process comprises: (i) hydrogenation stage, wherein supplied ethylene including impurities or secondary components such as acetylene and ethane reacts with hydrogen to remove acetylene via catalytic hydrogenation and to form ethylene, while a part of ethylene is converted into ethane; and (ii) polymerization stage, hen ethylene leaving stage (i) reacts in gas phase in fluidized-bed reactor to form polyethylene, wherein fluidizing gas contains, at the entry of reactor, ethylene and ethane in amount 20 to 70% based on the total volume of fluidizing gas, optionally with other components.
EFFECT: reduced investment and energetic expenses and increased yield of product for one pass in unit time.
5 cl, 2 dwg, 1 tbl, 3 ex
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