Process for producing aldehyde
View Patent ↗A process by which a hydroformylation reaction can be efficiently conducted without lowering the yield of an aldehyde in the reaction is provided. A process for producing an aldehyde which includes subjecting an olefin to a hydroformylation reaction with carbon monoxide and hydrogen in the presence of a catalyst, characterized in that the olefin is fed as a gas to a reactor. In feeding the olefin as a gas to the reactor, it is preferred to gasify the olefin with the heat of the hydroformylation reaction.
1. A process for producing an aldehyde comprising:
feeding an olefin as a gas to a reactor maintaining a stable liquid level in the reactor, and
subjecting the gaseous olefin to a hydroformylation reaction with carbon monoxide and hydrogen in the presence of a catalyst in liquid reaction,
wherein the reactor in which a stable liquid level is maintained is a mixing vessel or gas stripping reactor.
2. The process of claim 1 , wherein the olefin is gasified with the heat of the reaction before being fed to the reactor.
3. The process of claim 1 , wherein the olefin comprises 2-8 carbon atoms.
4. The process of claim 3 , wherein the olefin is ethylene, propylene, or 1-butene.
5. The process of claim 1 , wherein the catalyst is a rhodium complex catalyst comprising a trivalent organophosphorus compound as a ligand.
6. The process of claim 4 , wherein the olefin is propylene.
7. The process of claim 1 , wherein a solvent for dissolution of the catalyst is one selected from the group consisting of a condensate of the aldehyde yielded, an aliphatic hydrocarbon, an aromatic hydrocarbon, an alicyclic hydrocarbon, an alcohol, an ether, an ester and water.
8. The process of claim 7 , wherein the solvent for dissolution of the catalyst is the condensate of the aldehyde yielded or toluene.
9. The process of claim 1 , wherein a partial pressure of hydrogen is from 0.001 MPa to 20 MPa.
10. The process of claim 9 , wherein the partial pressure of hydrogen is from 0.1 MPa to 5 MPa.
11. The process of claim 1 , wherein a partial pressure of carbon monoxide is from 0.001 MPa to 20 MPa.
12. The process of claim 11 , wherein the partial pressure of carbon monoxide is from 0.1 MPa to 5 MPa.
13. The process of claim 1 , wherein a total pressure in the reactor is from 0.0001 MPaG to 50 MPaG.
14. The process of claim 13 , wherein the total pressure in the reactor is from 0.02 MPaG to 20 MPaG.
15. The process of claim 1 , wherein a ratio of partial hydrogen pressure to partial carbon monoxide pressure is from 0.1 to 100.
16. The process of claim 15 , wherein the ratio of partial hydrogen pressure to partial carbon monoxide pressure is from 1 to 6.
17. The process of claim 1 , wherein a reaction temperature is in the range 20° C. to 200° C.
18. The process of claim 17 , wherein the reaction temperature is in the range 50° C. to 150° C.
19. The process of claim 5 , wherein a rhodium concentration is from 1 ppm to 10 wt %.
20. The process of claim 19 , wherein the rhodium concentration is from 1,000 ppm to 1 wt %.