초록 ▼

The invention relates to a process for manufacturing acrylic acid from propane.According to this process, a gas mixture, which is free from molecular oxygen and comprises propane, steam as well as, optionally, an inert gas, is passed over a solid composition of formula (I) 1 V a Te b Nb c Si d

The invention relates to a process for manufacturing acrylic acid from propane.According to this process, a gas mixture, which is free from molecular oxygen and comprises propane, steam as well as, optionally, an inert gas, is passed over a solid composition of formula (I) 1 V a Te b Nb c Si d O x   (I) a is between 0.006 and 1, including the end points; b is between 0.006 and 1, including the end points; c is between 0.006 and 1, including the end points; d is between 0 and 3.5, including the end points; and x is the quantity of oxygen bound to the other elements, and depends on their oxidation states, in order to oxidize the propane according to the following redox reaction (1): oxidized +PROPANE→SOLID reduced +ACRYLIC ACID  (1).

대표청구항 ▼

1. A process for manufacturing acrylic acid from propane, comprising passing a gas mixture comprising propane and steam, as well as, optionally, an inert gas, over a solid composition of formula (I) 1 V a Te b Nb c Si d O x   (I)in which:a is between 0.006-1;b is between 0.006-1;

1. A process for manufacturing acrylic acid from propane, comprising passing a gas mixture comprising propane and steam, as well as, optionally, an inert gas, over a solid composition of formula (I) 1 V a Te b Nb c Si d O x   (I)in which:a is between 0.006-1;b is between 0.006-1;c is between 0.006-1;d is between 0-3.5; andx is the quantity of oxygen bound to the other elements, and depends on their oxidation states,with the proviso that the gas mixture is free from molecular oxygen. 2. A process according to claim 1, wherein, in the solid composition of formula (I):a is 0.09-0.8;b is 0.04-0.6;c is 0.01-0.4; andd is 0.4-1.6. 3. A process according to claim 1, wherein the reaction is carried out at a temperature of 200-500° C. 4. A process according to claim 3, wherein the reaction is carried out at a temperature of 250-450° C. 5. A process according to claim 1, wherein the reaction is carried out under a pressure of 1.01×10 4 -1.01×10 6 Pa. 6. A process according to claim 5, wherein the reaction is carried out under a pressure of 5.05×10 4 -5.05×10 5 Pa. 7. A process according to claim 1, wherein the reaction is carried out with a residence time of 0.01-90 seconds. 8. A process according to claim 7, wherein the reaction is carried out with a residence time of 0.1-30 seconds. 9. A process according to claim 2, wherein the reaction is carried out at a temperature of 250-450° C., under a pressure of 5.05×10 4 -5.05×10 5 Pa and with a residence time of 0.1-30 seconds. 10. A process according to claim 1, further comprising implemented with a reduction factor of between 10-40% for the solid composition. 11. A process according to claim 9, further comprising implemented with a reduction factor of between 10-40% for the solid composition. 12. A process according to claim 1, wherein once the solid composition has been converted at least partially into the reduced state, further comprising regeneration the solid composition:by heating in the presence of oxygen, or a gas containing oxygen, at a temperature of 250-500° C. for the time needed to re-oxidize the solid composition. 13. A process according to claim 10, wherein once the solid composition has been converted at least partially into the reduced state, further comprising regeneration the solid composition:by heating in the presence of oxygen, or a gas containing oxygen, at a temperature of 250-500° C. for the time needed to re-oxidize the solid composition. 14. A process according to claim 11, wherein once the solid composition has been converted at least partially into the reduced state, further comprising regeneration the solid composition:by heating in the presence of oxygen, or a gas containing oxygen, at a temperature of 250-500° C. for the time needed to re-oxidize the solid composition. 15. A process according to claim 12, wherein the reaction and the regeneration are carried out in a device with two stages, and in which two batches of solid composition alternate periodically. 16. A process according to claim 14, wherein the reaction and the regeneration are carried out in a device with two stages, and in two batches of solid composition alternate periodically. 17. A process according to claim 12, wherein the reaction and the regeneration are carried out in the same reactor, by alternating periods of reaction and regeneration. 18. A process according to claim 14, wherein the reaction and the regeneration are carried out in the same reactor, by alternating the periods of reaction and regeneration. 19. A process according to claim 12, wherein the reaction and the regeneration are carried out in a transported-bed reactor. 20. A process according to claim 1, further comprising recycling the propylene which is produced, and/or the propane which has not reacted, to the inlet of the reactor. 21. A process according to claim 15, wherein the two stages are a reactor and a regenerator which operate s imultaneously. 22. A process according to claim 16, wherein the two stages are a reactor and a regenerator which operate simultaneously. 23. A process for manufacturing acrylic acid from propane, comprising passing a gas mixture comprising propane and steam, as well as, optionally, an inert gas, over a solid composition of the formula: 1 V 0.33 Nb 0.11 Te 0.22 Si 1.08 O x or Mo 1 V 0.33 Nb 0.11 Te 0.22 O x wherein:x is the quantity of oxygen bound to the other elements, and depends on their oxidation states,with the proviso that the gas mixture is free from molecular oxygen. 24. A process according to claim 1, wherein the process oxidizes the propane according to the following redox reaction (1): oxidized +PROPANE→SOLID reduced +ACRYLIC ACID  (1). 25. A process according to claim 12, wherein the regeneration proceeds according to the reaction (2): reduced +O 2 →SOLID oxidized   (2).