Two stage hydrogenation to make neopentyl glycol

Details Two stage hydrogenation to make neopentyl glycol Two stage hydrogenation to make neopentyl glycol

1979-06-22

1981-02-10

Evans, Joseph E.

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

Organic compounds

Oxygen containing

568854, C07C 3120

Patent

active

042503370

ABSTRACT:
In a process for the production of neopentyl glycol comprising high-pressure hydrogenating a crude hydroxypivalaldehyde, containing the monoisobutyric acid ester of neopentyl glycol as an impurity, in the liquid phase over a barium-activated copper chromite catalyst, an improvement comprises hydrogenating the crude hydroxypivalaldehyde in the presence of 3-8% of water, and in two stages, wherein, in the first stage, the temperature is 120.degree.-160.degree. C. and the charge of hydrogenation starting material is 0.05-1.0 liter/liter of catalyst . h., and in the second stage, the temperature is 170.degree.-200.degree. C. and the charge of hydrogenation starting material is 0.05-1.0 liter/liter of catalyst . h., whereby there is obtained neopentyl glycol having a degree of purity of above 98% as determined by gas chromatographic analysis.

REFERENCES:
patent: 2400724 (1946-05-01), Walker
patent: 2818443 (1957-12-01), Roleson
patent: 3340312 (1967-09-01), Duke, Jr. et al.
patent: 3808280 (1974-04-01), Merger et al.
patent: 3920760 (1975-11-01), Heinz
"The Merck Index," 6th Ed., (1952), p. 441.

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