| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method that improves a start-up process when producing acrylic acid by a catalytic gas-phase oxidation of acrolein under high load conditions, wherein the start-up process includes a step of increasing the acrolein supply rate (loading) from a non-reacting condition to prescribed reaction conditions. <P>SOLUTION: The method is characterized in that the acrolein supply rate is increased in the start-up process of the reaction until the prescribed composition of starting reactant gas and the flow rate of the starting reactant gas are obtained, while adjusting at least one of the reaction temperature, the composition of the starting reactant gas and the flow rate of the starting reactant gas, so as to maintain the acrolein conversion at not lower than 90 mol%, the maximum peak temperature of the catalyst layer in each reaction zone at no higher than 400°C, and the sum of eachΔT (maximum peak temperature of a catalyst layer-reaction temperature) at the catalyst layer in each of the reaction zones to be no more than 150°C, respectively. According to the method, the reaction speedily reaches the steady state and a high acrylic acid yield is stably achieved from the start of the reaction. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
