Claims
- 1. In the process for the hydroformylation of olefins with carbon monoxide and hydrogen in the presence of soluble cobalt compounds as a catalyst at an elevated temperature and under increased pressure, the improvement comprising conducting said hydroformylation in a first stage with remixing of a reaction mixture comprising said olefins, carbon monoxide and hydrogen for a first period of time sufficient to produce an olefin conversion of about 40-75 percent as a converted product and then in a second stage continuing said hydroformylation of said converted product without remixing for a second period of time sufficient to produce an olefin conversion of about 95-98 percent, said olefins having 6 or more carbon atoms and selected from the group consisting of alpha olefins, olefins having internally positioned double bonds, olefins with branches in the carbon chain, olefins having branches in the carbon chain and internally positioned double bonds and mixtures of said olefins.
- 2. The method of claim 1, wherein said first stage is carried out in a pressure-proof back mix reactor (1) with a guide tube (2) arranged centrally in the interior and being open at the bottom and at the top, with a feed nozzle for the reaction mixture (4) disposed at the bottom, as well as with a discharge means (5) arranged at the top, said back mix reactor having a ratio of internal diameter to length of 1:5 to 1:25, and said second stage is carried out in a plurality of subsequently connected, pressure-proof tubular reactors (6) with inlet nozzles (7) arranged at the bottom and discharge conduits (8) arranged at the top, said plurality of subsequently connected tubular reactors (6) having a ratio of internal diameter to length of 1:20 to 1:1000, and wherein the total volume of said plurality of tubular reactors is 5 to 1.2 times the volume of said back mix reactor.
- 3. The method of claim 2, wherein said tubular reactors have cooling jackets (9).
- 4. The method of claim 2, wherein the first, second and third of said tubular reactors have cooling jackets.
- 5. The method of claim 1, wherein said carbon monoxide and hydrogen comprise synthesis gas in a concentration of 70-30 percent carbon monoxide and 30-70 percent hydrogen, said synthesis gas comprising 5 to 1.2 fold molar amount based on said olefins.
- 6. The method of claim 5, wherein said hydroformylation is carried out at a temperature of about 100.degree.-200.degree. C.
- 7. The method of claim 1, wherein said olefins are .alpha.-olefins having 6-10 carbon atoms, and said hydroformylation is carried out at a temperature of about 100.degree.-130.degree. C.
- 8. The method of claim 1, wherein said olefins have 6-20 carbon atoms and said hydroformylation is carried out at a temperature of about 160.degree.-180.degree. C.
- 9. The method of claim 6, wherein said hydroformylation is carried out at a pressure of about 200-350 bars.
- 10. The method of claim 1, wherein said first stage is carried out in a back mix reactor and said second stage is carried out in tubular reactors and the volume of said tubular reactors to the volume of said back mix reactor is between 3:1 and 1.5:1.
- 11. The method of claim 10, wherein said first stage has an olefin conversion rate of 55-71%.
- 12. The method of claim 11, wherein said first and second stage have an olefin conversion rate of 97.1-97.8%.
- 13. The method of claim 10, wherein said back mix reactor has a residence time of 0.0795-0.159 hours.
- 14. The method of claim 13, wherein said back mix reactor and said tubular reactors have a total residence time of 0.33-0.40 hours.
- 15. The method of claim 9, wherein the input of olefins is 40 liters per hour.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2538037 |
Aug 1975 |
DEX |
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Parent Case Info
This is a division of application Ser. No. 711,460, filed Aug. 4, 1976, now abandoned.
US Referenced Citations (4)
Divisions (1)
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Number |
Date |
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Parent |
711460 |
Aug 1976 |
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