| 摘要 |
<p>A two-stage process for the catalytic conversion of an aldose to a polyol comprises passing a feedstock containing at least 20% by weight monosaccharide solution having a pH >/= 7 at a temperature of from 130-180 DEG C over a fixed bed of high- activity metal catalyst in the presence of hydrogen, withdrawing the alditol product and passing it together with a promoter and hydrogen over a second fixed-bed containing stabilized high- activity metal catalyst at a temperature of 204-271 DEG C, withdrawing the product stream and recovering the polyol therefrom. A portion of the sugars produced from the second hydrogenolysis stage is recycled back to the first hydrogenation stage for further conversion.</p> |
