| 摘要 |
1454690 Hydrogenation of molten aldehydic dimethyl terephthalate HERCULES Inc 3 Dec 1974 [2 Jan 1974] 52171/74 Heading C2C In a process for treating molten aldehydic DMT by subjecting it to catalytic hydrogenation with a catalyst that not only promotes hydrogenation of the aldehydic content, but also tends to the temperature of the molten DMT to promote ring hydrogenation, the improvement for minimizing said ring hydrogenation comprises contacting said molten aldehydic DMT at a temperature of from 141‹ to 240‹ C. with (1) a quantity of molecular hydrogen sufficient to hydrogenate at least a substantial portion of said aldehydic content and (2) a catalytic quantity of said catalyst for a period of time sufficient for hydrogenation of at least a substantial portion of the aldehydic content, but insufficient for substantial ring hydrogenation, |
