| 摘要 |
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 DEG -160 DEG 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 DEG -200 DEG 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.
|
