313504-55-1

Relevant academic research and scientific papers

Preparation method of terephthalic acid and diester thereof

The invention discloses a preparation method of terephthalic acid and diester thereof. Specifically, under the action of a supported metal catalyst, 2-cyclohexene-1,4-dicarboxylic acid undergoes catalytic dehydro-aromatization in a polar solvent or a nonpolar solvent so as to prepare terephthalic acid and diester. The polar solvent is water, methanol, ethanol, n-propanol, isopropanol, n-butanol, glycol dimethyl ether and diglyme. The nonpolar solvent is one or more than two components selected from a group consisting of n-hexane, n-heptane, normal octane, cyclohexane, benzene and toluene. A metal active component of the supported metal catalyst is non-noble metal and/or noble metal. A carrier for the supported metal catalyst is one or more than two components selected from a group consisting of a carbon carrier, nanoscale metal oxide, nanometer nonmetal oxide and a molecular sieve. When conversion rate of 2-cyclohexene-1,4-dicarboxylic acid is 95% and above, selectivity of terephthalic acid or diester of terephthalic acid can reach 90%.

Selected cyclohexane -1,3-and -1,4-dicarboxylic acid esters

Selected cyclohexane-1,3- and -1,4-dicarboxylic acid esters are described, as is their use as plasticizers in plastics and their preparation by hydrogenation of the corresponding isophthalic or terephthalic esters by bringing one or more of these isophthalic or terephthalic esters into contact with a hydrogen-containing gas in the presence of a catalyst which comprises, as active metal, at least one metal of the 8th transition group of the Periodic Table on its own or together with at least one metal of the 1st or 7th transition group of the Periodic Table, applied to a support, which comprises using a support having micropores.