Patent ID: 9556104
Date: 2017-01-31
CPC Classifications: C07C,C08K,C08L

Claim:
1. A process for the semi-continuous catalytic liquid phase hydrogenation of esters of aromatic carboxylic diacids and triacids, wherein the esters, loaded in a reactor without adding diluent/solvent, are hydrogenated at an internal temperature of the reactor comprised in the range from 100° C. to 200° C., by continuously feeding a hydrogenation gas into the reactor, controlling the hydrogenation gas pressure inside the reactor to values in the range from at least 7 bar gauge (barg) to below 18 barg and in the presence of 0.1-3% by weight relative to the quantity of esters of aromatic carboxylic acids loaded into the reactor, of a supported catalyst comprising between 0.1 and 10% by weight, relative to the total weight of the catalyst, of an active metal of the group consisting of ruthenium, rhodium, palladium, osmium, iridium, platinum, gold or mixtures thereof, and optionally of at least one additional metal selected from groups I-III of the periodic system, also present at most as 10% by weight, relative to the total quantity of catalyst, and present in a quantity that does not exceed that of the active metal.