Method for the production of benzene carboxylic acids and benzene dicarboxylic acid esters
AssigneeHuels Troisdorf AG
InventorsHans Leuck, Hans-Jorg Westermann
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Abstract
Disclosed is a method for the production of benzene carboxylic acids and benzene carboxylic acid esters or their mixtures, while p-toloylic acid is made from p-xylene and terephthalic acid monomethyl ester is simultaneously prepared from p-toluylic acid ester. The oxidation is performed by the addition of oxidator liquid and gases containing oxygen in single orifice mixing nozzles with the formation of a highly disperse reaction phase and the single orifice mixing nozzles open into the oxidator liquid.
Claims14
A method for preparing benzene carboxylic acids and benzene dicarboxylic acid esters and their mixtures comprising:
- introducing into an oxidator, xylene and/or toluylic acid ester and a heavy metal-containing oxidation catalyst to form a reaction phase;
- and oxidizing the xylene and/or toluylic acid ester with oxygen or an oxygen-containing gas in the presence of the heavy metal-containing oxidation catalyst at a temperature of 100.degree. to 200.degree. C. with the use of elevated pressure of 0.2 to 1.5 MPa, wherein said oxidizing is carried out by withdrawing at least a portion of the reaction phase and recycling the reaction phase into the reactor in the form of a highly dispersed reaction phase by atomizing the reaction phase with the addition of oxygen or an oxygen-containing gas in at least one single orifice mixing nozzle to bring about the oxidation.
Dependencies are inferred from the claim text.