A method of oxidatively dehydrogenating a n-butenes to butadiene includes oxidatively dehydrogenating dehydrogenation reactant in a first adiabatic, catalytic reaction zone to provide a first-stage effluent stream enriched in butadiene at a first-stage effluent temperature above the first-stage inlet temperature, cooling the first-stage effluent stream in a first heat transfer zone to a second-stage inlet temperature lower than said first-stage effluent temperature to provide a second gaseous feed stream comprising superheated steam, n-butene and butadiene, wherein the second stage inlet temperature is lower than said first stage effluent temperature and oxidatively dehydrogenating n-butene in the second stream to provide a product stream further enriched in butadiene at a second stage effluent temperature above said second-stage inlet temperature. The first reaction zone temperature rise and the second reaction zone temperature rise are at least 200° F. (111° C.) and the first heat transfer zone temperature reduction is at least 50% of the value of the first reaction zone temperature rise.
一种将正
丁烯氧化脱氢为
丁二烯的方法包括:在第一绝热催化反应区中氧化脱氢脱氢反应物,以提供富含
丁二烯的第一级流出液流,其第一级流出液流温度高于第一级入口温度;在第一传热区中冷却第一级流出液流,使其第二级入口温度低于所述第一级流出液流温度,以提供包含过热蒸汽的第二气体进料流、正
丁烯和
丁二烯,其中第二级入口温度低于所述第一级流出温度,并在第二级流出温度高于所述第二级入口温度的情况下,氧化脱氢第二气流中的正
丁烯,以提供进一步富含
丁二烯的产物气流。第一反应区温升和第二反应区温升至少为 200° F(111° C),第一传热区温度降低至少为第一反应区温升值的 50%。