Method of contact catalytic reaction
View Patent ↗A method of contact catalytic reaction by introducing a gas and a liquid into a lower part of a reaction zone comprising a liquid phase and a catalyst-packed bed held therein, where the catalyst-packed bed is a fixed bed.
1. A method of contact catalytic reaction for producing diacetoxybutene, comprising introducing an oxygen-containing gas and a liquid containing butadiene and acetic acid into a lower part of a reaction zone comprising a liquid phase and a catalyst-packed bed held therein, passing the gas and the liquid through the catalyst-packed bed as a flow of a gas/liquid mixed phase comprising the liquid and bubbles of the gas finely dispersed therein, and causing a gas and a liquid containing diacetoxybutene to flow out of an upper part of the reaction zone, wherein the horizontal-direction movement of the gas/liquid mixed phase flow around the lower side of the catalyst-packed bed is controlled by disposing, under the catalyst-packed bed, flow control plates projecting downward from the lower side of the bed, wherein the catalyst-packed bed is a fixed bed, wherein
the oxygen-containing gas contains 12 mol % or more of oxygen, and
the catalyst-packed bed has a porosity of from 0.30 to 0.41.
2. The process of claim 1 , wherein the solid catalyst is one provided on the surface of a support selected from the group consisting of silica, alumina, silica-alumina, titania, and activated carbon.
3. The process of claim 1 , wherein the flow control plates are disposed so as to partition the lower side of the catalyst-packed bed into ten or more sections.
4. The process of claim 1 , wherein the flow control plates are disposed so as to partition the lower side of the catalyst-packed bed into sections of 0.25 m 2 or smaller.
5. The process of claim 1 , wherein the flow control plates project over a length of 30 mm or longer.
6. The process of claim 1 , wherein the height-direction distance between an inlet for gas introduction into the reaction zone and the lower end of the flow control plates is 20 cm or longer.
7. The process of claim 1 , wherein a liquid-circulating path for withdrawing a reaction liquid from the reaction zone and supplying the liquid to a lower part of the reaction zone is formed and mixing devices are disposed in this circulating path in two-stage arrangement, and that the former mixing device is used to feed an oxygen-containing gas and disperse the gas into the reaction liquid flowing through the circulating path and butadiene is supplied to the latter mixing device and mixed with the reaction liquid.
8. The process of claim 7 , wherein the mixing devices are static mixers.
9. The process of claim 1 , wherein the catalyst has a particle diameter of from 1 to 6 mm and the packing density of the catalyst is 0.35 g/ml or higher.
10. The process of claim 1 , wherein the gas which is being introduced into the reaction zone has a superficial velocity of from 0.05 to 10 cm/sec.
11. The process of claim 1 , wherein the oxygen-containing gas is air.
12. The process of claim 1 , wherein the oxygen-containing gas is oxygen-enriched air.
13. The process of claim 1 , wherein the oxygen-containing gas is oxygen.
14. The process of claim 1 , wherein the oxygen-containing gas is diluted oxygen gas.
15. The process of claim 1 , which is conducted at a pressure of 3 to 8 MPa and a temperature of from 60 to 120° C.
16. The process of claim 1 , wherein the catalyst-packed bed has a porosity of from 0.33 to 0.40.
17. The process of claim 1 , wherein the ratio of the gaseous phase to the liquid phase to be introduced into the reaction zone is from 0.5 to 1.0.