Hydrogenation process

Details Hydrogenation process Hydrogenation process

1985-09-11

1986-12-02

Evans, J. E.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

549503, 568835, 568857, 585266, 260413CD, C07C 2914, C07C 2917, C07C 29132, C11C 312

Patent

active

046266046

ABSTRACT:
A continuous multi-stage hydrogenation process is described.
This is effected in at least three catalytic stages connected in series. All stages up to and including the penultimate stage are operated adiabatically and in the vapor phase. Aldehyde (or other unsaturated organic compound) is fed to all stages up to and including the penultimate stage. The rate of supply of the aldehyde or other unsaturated organic compound to the penultimate stage is controlled in relation to the catalyst volume in the penultimate catalytic stage so that the degree of hydrogenation in that stage is less than 100%. The remaining chemically unsaturated material in the product mixture from the penultimate stage is hydrogenated, after cooling that product mixture, in the final catalytic stage to produce a substantially completely hydrogenated product mixture. In this way the dwell time of the reactants and product(s) at "hot spot" temperatures is minimized, thus reducing byproduct formation.

REFERENCES:
patent: 2549416 (1951-04-01), Brooks
patent: 2760994 (1956-08-01), Gwynn
patent: 2771493 (1956-11-01), Jacks et al.
patent: 3288866 (1966-11-01), Cooper
patent: 3301909 (1967-01-01), Kawasaki et al.
patent: 4451677 (1984-05-01), Bradley et al.

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