Method of producing an homogeneous gas mixture

The method of producing a homogenous gas mixture from two gas streams of different parameters, for multistage exothermic or endothermic reactions consisting of

• a. flowing a reaction gas stream through a catalyst layer to a relatively open space for equalizing the expansion and velocity of the reaction gas stream,
• b. the free cross-sectional area of the reaction gas stream in said open space being greater than the free cross-sectional area of the catalyst layer,
• c. causing the reaction gas stream in such space to pass concurrently through a plurality of parallel mixing zones,
• d. introducing quench gas through a two-stage pressure reduction to said mixing zones including first passing said quench gas to a closed area around said mixing zones and permitting expansion thereof to spaces around said zones so as to effect the first of said pressure reductions,
• e. causing quench gas to pass from the spaces around said zones into said zones so as to effect the second of said pressure reductions,
• f. passing the resultant reaction gas and quench gas mixture in parallel flow through restricted openings in said zones thereby increasing the velocity and effecting a complete homogenous mixture of the gases, and
• g. passing the homogenous gas mixture to the entrance of a second catalyst layer downstream.