is to remove acrylic acid from the gas flow and to avoid the introduction of this acid into the propylene to acrolein oxidation reactor another advantage is to increase the acrylic acid yield majority by product of the partial oxidation reaction of propane and also to limit the formation of secondary by products such as propionic acid or acetone according to the invention the propane undergoes partial conversion to propylene in a reactor placed in parallel with the adsorption column intended for acrylic acid recovery this partial conversion takes place in the presence of a catalyst constituted by a mixture of oxides and under specific operating conditions allowing the formation of by products such as in particular propionic acid and acetone to be limited and propylene to be obtained as the majority product the gas flow is then reintroduced into the adsorption column used for the recovery of acrylic acid then routed to the reactor for propylene to acrolein conversion according to the invention the process of partial oxidation of propane to propylene is implemented at a high temperature 300 to 500 u00b0 c and preferably greater than 380 u00b0 c up to 450 u00b0 c and at high volume velocities per hour vvh flow of reaction gas volume of catalyst advantageously the operation takes place at a vvh greater than 10000 h u2212 1 and preferably comprised between values greater than 10 000 h u2212 1 and 20 000 h u2212 1 according to the invention the catalyst used for the partial oxidation of propane to propylene is a mixture of oxides containing elements chosen from.