| 摘要 |
<p>Crude 2,2-dimethyl-1,3-propanediol (NPG) is distilled in the presence of sulfuric acid, phosphoric acid or a mixture thereof, with the pH value being set between 6.5 and 7.5, preferably between 6.9 and 7.1 to prepare pure 2,2-dimethyl-1,3-propanediol.</p> |
