INTEGRATION OF OXIDATIVE COMBINATION INTO METHANE PLANTS Russian patent published in 2022 - IPC C07C2/76 C07C11/06 C07C5/327 C07C6/04 C07C11/08 

FIELD: chemistry.

SUBSTANCE: invention relates to a method for propylene production. The method includes: (a) supply of the first stream containing methane (CH₄) and the second stream containing an oxidative agent to a reactor of oxidative methane combination (hereinafter – OMC) at a temperature of at least approximately 400°C and pressure of at least approximately 3 bar (exc.) to obtain an OMC product stream containing ethylene, propylene, propane and unconverted methane (CH₄); (b) fractionation of the OMC product stream using one or more separation plants to obtain (i) the third stream containing ethylene and (ii) the fourth stream containing propylene and propane; (c) supply of at least part of the fourth stream to an additional separation plant to obtain a propylene stream and a propane stream; (d) supply of at least part of the propane stream to a propane dehydration (hereinafter – PDH) plant to obtain an outgoing PDH stream containing propylene, methane and hydrogen; (e) separation of the outgoing PDH stream into the fifth stream containing propylene, the sixth stream containing methane, and the seventh stream containing hydrogen; (f) supply of at least part of the sixth stream to the OMC reactor; (g) supply of at least part of the third stream to a dimerization reactor to obtain a butene stream, wherein less than approximately 50% of the specified butene stream is isobutene; and (h) supply of the specified butene stream to a metathesis reactor to obtain an outgoing stream containing propylene and unconverted butene.

EFFECT: proposed method allows for effective obtaining of olefins by the integration of an oxidative methane combination (OMC) process with an additional process that can either provide raw materials for the OMC process, or spend OCM process products.

18 cl, 24 dwg, 1 tbl