High Throughput Oxidative Dehydrogenation Process

摘要

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.

主权项

1. A method of oxidatively dehydrogenating a dehydrogenation reactant comprising:
(a) providing a first gaseous feed stream to a first adiabatic, catalytic reaction zone at a first-stage inlet temperature, the first feed stream including a dehydrogenation reactant, oxygen and superheated steam, wherein the molar ratio of superheated steam to dehydrogenation reactant is less than 10 mol/mol; (b) oxidatively dehydrogenating dehydrogenation reactant in said first adiabatic, catalytic reaction zone to provide a first-stage effluent stream enriched in said dehydrogenated product at a first-stage effluent temperature above said first-stage inlet temperature, by an amount referred to as a first reaction zone temperature rise; (c) 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, dehydrogenation reactant and dehydrogenated product, wherein the second stage inlet temperature is lower than said first stage effluent temperature by an amount referred to as a first heat transfer zone temperature reduction; (d) feeding said second gaseous feed stream at said second-stage inlet temperature to a second adiabatic, catalytic reaction zone along with additional oxygen and additional stream, said additional steam being added in an amount of from 0 mol/mol to 10 mol/mol of steam/dehydrogenation reactant; (e) oxidatively dehydrogenating dehydrogenation reactant in said second adiabatic, catalytic reaction zone to provide a second stage effluent stream further enriched in said dehydrogenated product at a second stage effluent temperature above said second-stage inlet temperature by an amount referred to as a second reaction zone temperature rise,wherein said first reaction zone temperature rise and said second reaction zone temperature rise are at least 200° F. (111° C.) and said first heat transfer zone temperature reduction is at least 50% of the value of the first reaction zone temperature rise.