| 摘要 |
<p>1425375 Dimethyl terephthalate CHEMISCHE WERKE HULS AG 18 May 1973 [20 May 1972] 23723/73 Heading C2C A process for the continuous gas phase catalytic esterification comprises contacting solid terephthalate acid in a pre-reactor with a stream of hot methanol vapour to cause vaporization of the terephthalic acid and passing the resulting mixture comprising the vaporized terephthalic acid and methanol vapour through a fixed bed of catalyst, a portion of the hot gaseous esterification mixture formed by contact of the reactant mixture with the catalyst being recycled into the pre-reactor. Examples are furnished.</p> |
